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{{Short description|Aircraft electronic recording device}}
{{Use mdy dates|date=January 2022}}
{{Use American English|date=January 2022}}
[[File:Fdr sidefront.jpg|thumb|A modern flight data recorder; the [[underwater locator beacon]] is the small cylinder on the far right. (Translation of warning message in French: "Flight recorder do not open".) The warning appears in English on the other side.]]
[[File:Soviet MS-61 Cockpit Voice Recorder.jpg|thumb|Cold War-era [[Soviet Union|Soviet]] MS-61 cockpit voice recorder from a [[Mikoyan-Gurevich MiG-21|MiG-21 interceptor]]]]

A '''flight recorder''' is an electronic recording device placed in an [[aircraft]] for the purpose of facilitating the investigation of [[aviation accidents and incidents]]. The device may often be referred to colloquially as a "'''black box'''", an outdated name which has become a [[misnomer]]—they are now required to be painted [[Safety orange|bright orange]], to aid in their recovery after accidents.

There are two types of flight recording devices: the '''flight data recorder''' ('''FDR''') preserves the recent history of the flight through the recording of dozens of parameters collected several times per second; the '''cockpit voice recorder''' ('''CVR''') preserves the recent history of the sounds in the cockpit, including the conversation of the pilots. The two devices may be combined into a single unit. Together, the FDR and CVR objectively document the aircraft's flight history, which may assist in any later investigation.

The two flight recorders are required by international regulation, overseen by the [[International Civil Aviation Organization]], to be capable of surviving the conditions likely to be encountered in a severe aircraft accident. For this reason, they are typically specified to withstand an impact of 3400 [[g-force|''g'']] and temperatures of over {{convert|1000|C}}, as required by [[EUROCAE]] ED-112. They have been a mandatory requirement in commercial aircraft in the United States since 1967. After the unexplained disappearance of [[Malaysia Airlines Flight 370]] in 2014, commentators have called for live streaming of data to the ground, as well as extending the battery life of the underwater locator beacons.

== History ==
[[File:Apparatus for Directing and Recording the Course of a Steam Ship, and for Signalling, patent granted January 1897.jpg|thumb|maritime 'black box' forerunner invented by John Inches Thomson]]
In seafaring, a device which recorded the position of different vessels in case of an accident was patented by John Sen Inches Thomson in January, 1897.  

[[File:2002-dmuseum-luftfahrt-014-650.jpg|thumb|A Fairchild A100 cockpit voice recorder, on display in the [[Deutsches Museum]]. This is a magnetic-tape unit built to an old standard, [[Technical Standard Order|TSO]] C84, as shown on the nameplate. The text on the side in French says "Flight recorder do not open".]]

=== Early designs ===
One of the earliest and proven attempts was made by [[François Hussenot]] and Paul Beaudouin in 1939 at the [[Marignane]] flight test center, France, with their "type HB" flight recorder; they were essentially photograph-based flight recorders, because the record was made on a scrolling [[photographic film]] {{convert|8|m|yd}} long by {{convert|88|mm}} wide. The [[latent image]] was made by a thin ray of light deviated by a mirror tilted according to the magnitude of the data to be recorded (altitude, speed, etc.).<ref name="Fayer"/> A pre-production run of 25 "HB" recorders was ordered in 1941 and HB recorders remained in use in French flight test centers well into the 1970s.<ref name="Beaudouin-2"/><ref>{{Cite web|title=Black Box History|date=May 22, 2020|website=Native Khabar|url=https://www.nativekhabar.com/india/black-box-plane-flight-data-recorder-aeroplane/5731|access-date=May 22, 2020|archive-date=January 25, 2022|archive-url=https://web.archive.org/web/20220125123838/http://nativekhabar.com/|url-status=live}}</ref>

In 1947, Hussenot founded the Société Française des Instruments de Mesure with Beaudouin and another associate, so as to market his invention, which was also known as the "hussenograph". This company went on to become a major supplier of data recorders, used not only aboard aircraft but also trains and other vehicles. SFIM is today part of the [[Safran]] group and is still present in the flight recorder market. The advantage of the film technology was that it could be easily developed afterwards and provides a durable, visual feedback of the flight parameters without needing any playback device. On the other hand, unlike magnetic tapes or later flash memory-based technology, a photographic film cannot be erased and reused, and so must be changed periodically. The technology was reserved for one-shot uses, mostly during planned test flights: it was not mounted aboard civilian aircraft during routine commercial flights. Also, cockpit conversation was not recorded.

Another form of flight data recorder was developed in the UK during World War II. Len Harrison and Vic Husband developed a unit that could withstand a crash and fire to keep the flight data intact.  The unit was the forerunner of today's recorders, in being able to withstand conditions that aircrew could not.  It used copper foil as the recording medium, with various styli, corresponding to various instruments or aircraft controls, indenting the foil. The foil was periodically advanced at set time intervals, giving a history of the aircraft's instrument readings and control settings. The unit was developed at [[Farnborough, Hampshire|Farnborough]] for the [[Ministry of Aircraft Production]]. At the war's end the Ministry got Harrison and Husband to sign over their invention to it and the Ministry patented it under British patent 19330/45.

[[File:Lentokoneen_musta_laatikko._Ollut_käytössä_1940-70._Valtion_lentokonetehdas,_1940-luku._Tampereen_museot._Kuva_Marika_Tamminen,_Vapriikin_kuva-arkisto._(16271443869).jpg|thumb|right|"Mata-Hari" flight data recorder]]

The first modern flight data recorder, called "Mata-Hari", was created in 1942 by Finnish aviation engineer Veijo Hietala. This black high-tech mechanical box was able to record all required data during test flights of [[fighter aircraft]] that the [[Finnish Air Force]] repaired or built in its main [[Valtion lentokonetehdas|aviation factory]] in [[Tampere]], Finland.<ref>{{cite web|url=http://siiri.tampere.fi/displayObject.do?uri=http://www.profium.com/archive/ArchivedObject-8077CE76-2B43-6FAA-D11C-77AAFD6C72E8|trans-title=State aircraft factory: Mata-Hari or black box|title= Valtion lentokonetehdas: Mata-Hari eli musta laatikko |date=1946| website=Museums of Tampere |archive-url=https://web.archive.org/web/20171019110346/http://siiri.tampere.fi/displayObject.do?uri=http%3A%2F%2Fwww.profium.com%2Farchive%2FArchivedObject-8077CE76-2B43-6FAA-D11C-77AAFD6C72E8 |archive-date=October 19, 2017 |url-status=dead|access-date=October 19, 2017|language=fi}}</ref>

During World War II both British and American air forces successfully experimented with aircraft voice recorders.<ref>{{Cite AV media|last=Chuck Owl|title=Audio From the Past [E01] - WW2 - Avro Lancaster Crew Radio|date=February 4, 2015|url=https://www.youtube.com/watch?v=MF5_hvE4WEA|access-date=February 13, 2019|via=[[YouTube]]|archive-date=November 16, 2018|archive-url=https://web.archive.org/web/20181116214517/https://www.youtube.com/watch?v=MF5_hvE4WEA&feature=youtu.be|url-status=live}}</ref> In August 1943 the [[United States Army Air Forces|USAAF]] conducted an experiment with a [[Wire recording|magnetic wire recorder]] to capture the inter-phone conversations of a B-17 bomber flight crew on a combat mission over Nazi-occupied France.<ref>{{Cite web|url=https://www.americanradiohistory.com/Archive-Radio-News/40s/Radio-News-1944-01-R.pdf|title=Radio News, 'Radio - On a Flying Fortress' |page=21|last=Porter|first=Kenneth|date=January 1944|website=www.americanradiohistory.com|access-date=February 13, 2019|archive-date=January 25, 2022|archive-url=https://web.archive.org/web/20220125123836/https://worldradiohistory.com/Archive-Radio-News/40s/Radio-News-1944-01-R.pdf|url-status=live}}</ref> The recording was broadcast back to the United States by radio two days afterwards.

=== Australian designs ===
[[File:ABC Black Box.ogv|thumb|Video clip of 1985 [[Australian Broadcasting Corporation|ABC]] news report interviewing David Warren about his invention]]
In 1953, while working at the Aeronautical Research Laboratories (ARL) of the [[Defence Science and Technology Group|Defence Science and Technology Organisation]] in [[Melbourne]],<ref name="DSTO"/> Australian research scientist [[David Warren (inventor)|David Warren]] conceived a device that would record not only the instrument readings, but also the voices in the cockpit.<ref name="APC"/> In 1954 he published a report entitled "A Device for Assisting Investigation into Aircraft Accidents".<ref name="Independent"/>

Warren built a [[prototype]] FDR called "The ARL Flight Memory Unit" in 1956,<ref name="Independent"/> and in 1958 he built the first combined FDR/CVR prototype.<ref name="APC"/><ref>[https://content.time.com/time/subscriber/article/0,33009,1909619,00.html "A Brief History of Black Boxes"]. ''[[Time (magazine)|Time]]''. July 20, 2009. p. 22.</ref> It was designed with civilian aircraft in mind, explicitly for post-crash examination purposes.<ref name="Time"/> Aviation authorities from around the world were largely uninterested at first, but this changed in 1958 when Sir Robert Hardingham, the [[Secretary (title)|secretary]] of the [[Civil Aviation Authority (United Kingdom)|British Air Registration Board]], visited the ARL and was introduced to David Warren.<ref name="DSTO"/> Hardingham realized the significance of the invention and arranged for Warren to demonstrate the prototype in the UK.<ref name="Independent"/>

The ARL assigned an engineering team to help Warren develop the prototype to the airborne stage. The team, consisting of electronics engineers Lane Sear, Wally Boswell, and Ken Fraser; developed a working design that incorporated a fire-resistant and shockproof case, a reliable system for encoding and recording aircraft instrument readings and voice on one wire, and a ground-based decoding device. The ARL system, made by the British firm of S. Davall & Sons Ltd, in [[Middlesex]], was named the "Red Egg" because of its shape and bright red color.<ref name="Independent"/>

The units were redesigned in 1965 and relocated at the rear of aircraft to increase the probability of successful data retrieval after a crash.<ref>{{cite web|url=https://www.aea.net/AvionicsNews/ANArchives/FlightDataRecordersJan06.pdf|title=Flight Data Recorders – Built to Survive|author=Tony Bailey|date=January 2006|page=38|publisher=Avionics News|website=aea.net|access-date=September 5, 2018|archive-date=December 10, 2019|archive-url=https://web.archive.org/web/20191210013702/http://aea.net/AvionicsNews/ANArchives/FlightDataRecordersJan06.pdf|url-status=live}}</ref>

Carriage of data recording equipment became mandatory in UK-registered aircraft in two phases; the first, for new turbine-engined public transport category aircraft over {{convert|12000|lb|kg|abbr=on}} in weight, was mandated in 1965, with a further requirement in 1966 for piston-engined transports over {{convert|60000|lb|kg|abbr=on}}, with the earlier requirement further extended to all jet transports. One of the first UK uses of the data recovered from an aircraft accident was that recovered from the Royston "Midas" data recorder that was on board the [[British Midland International|British Midland]] [[Canadair North Star|Argonaut]] involved in the [[Stockport Air Disaster]] in 1967.<ref>{{cite web |url=https://www.flightglobal.com/pdfarchive/view/1967/1967%20-%201315.html |url-status=dead |archive-url=https://web.archive.org/web/20190214002903/https://www.flightglobal.com/pdfarchive/view/1967/1967%20-%201315.html |archive-date=February 14, 2019 |title=1967 {{!}} 1315 {{!}} Flight Archive}}</ref>

===American designs===
[[File:NTSB investigators remove the recorders from UPS 1354 (9518908718).jpg|thumb|NTSB investigators recover flight data recorder and cockpit voice recorder from [[UPS Airlines Flight 1354]]]]
[[File:CVR in NTSB Lab (33406167018).jpg|thumb|NTSB staff examine the memory boards of the cockpit voice recorder from [[Atlas Air Flight 3591]]. The boards may have suffered water damage]]
A flight recorder was invented and patented in the United States by James J. Ryan. Ryan's "Flight Recorder" patent was filed in August 1953 and approved on November 8, 1960, as US Patent 2,959,459.<ref>{{Cite web |url=http://pdfpiw.uspto.gov/.piw?PageNum=0&docid=02959459 |title=US Patent 2,959,459 for Flight Recorder by James J. Ryan |access-date=March 25, 2014 |archive-date=January 8, 2016 |archive-url=https://web.archive.org/web/20160108175156/http://pdfpiw.uspto.gov/.piw?PageNum=0&docid=02959459 |url-status=live }}</ref> A second patent by Ryan for a "Coding Apparatus For Flight Recorders" is US Patent 3,075,192<ref>{{Cite web |url=http://pdfpiw.uspto.gov/.piw?PageNum=0&docid=03075192 |title=US Patent 3,075,192 for Coding Apparatus for Flight Recorders by James J. Ryan |access-date=January 7, 2014 |archive-date=January 8, 2016 |archive-url=https://web.archive.org/web/20160108175156/http://pdfpiw.uspto.gov/.piw?PageNum=0&docid=03075192 |url-status=live }}</ref> dated January 22, 1963.

A "Cockpit Sound Recorder" (CSR) was independently invented and patented by Edmund A. Boniface Jr., an aeronautical engineer at [[Lockheed Aircraft Corporation]].<ref name="US3327067"/><ref>[http://www.slyck.com/story2348_Airplane_Black_Box_Flight_Recorder_Technology_How_it_Works "Airplane 'Black Box' Flight Recorder Technology, How it Works"] {{Webarchive|url=https://web.archive.org/web/20161011073938/http://www.slyck.com/story2348_Airplane_Black_Box_Flight_Recorder_Technology_How_it_Works |date=October 11, 2016 }}. ''Slyck News'', March 13, 2014</ref><ref>[http://guardianlv.com/2014/03/why-are-cockpit-voice-recorders-painted-orange-and-called-a-black-box/ " Why Are Cockpit Voice Recorders Painted Orange and Called a Black Box?"] {{Webarchive|url=https://web.archive.org/web/20160917172701/http://guardianlv.com/2014/03/why-are-cockpit-voice-recorders-painted-orange-and-called-a-black-box/ |date=September 17, 2016 }}. ''Guardian Liberty Voice'', By Jerry Nelson on March 8, 2014</ref> He originally filed with the US Patent Office on February 2, 1961, as an "Aircraft Cockpit Sound Recorder".<ref>{{Cite web|url=https://www.aahs-online.org/journals/journal_template.php?vol_no=v59n34|title=AAHS Journal Vol 59 Nos 3-4 - Fall / Win|website=www.aahs-online.org|access-date=September 3, 2021|archive-date=September 3, 2021|archive-url=https://web.archive.org/web/20210903142935/https://www.aahs-online.org/journals/journal_template.php?vol_no=v59n34|url-status=live}}</ref> The 1961 invention was viewed by some as an "invasion of privacy".{{citation needed|date=August 2024}} Subsequently, Boniface filed again on February 4, 1963, for a "Cockpit Sound Recorder" (US Patent 3,327,067)<ref name="US3327067">{{cite web|title=Cockpit Sound Recorder|url=https://patents.google.com/patent/US3327067?oq=edmund+boniface|work=Google Patents|publisher=Google Inc.|access-date=December 31, 2013|archive-date=April 28, 2016|archive-url=https://web.archive.org/web/20160428165251/https://www.google.com/patents/US3327067?pg=PA1&dq=edmund+boniface&hl=en&sa=X&ei=5C_CUqWACpXioASq74HIDw&ved=0CDcQ6AEwAA|url-status=live}}</ref> with the addition of a spring-loaded switch which allowed the pilot to erase the audio/sound tape recording at the conclusion of a safe flight and landing.

Boniface's participation in aircraft crash investigations in the 1940s<ref>[https://issuu.com/fl600aviationdigest/docs/issue_11_may_2015/58 "The Flight Data Recorder"] {{Webarchive|url=https://web.archive.org/web/20161011060517/https://issuu.com/fl600aviationdigest/docs/issue_11_may_2015/58 |date=October 11, 2016 }}. ''Aviation Digest'', May 11, 2015, page 58.</ref> and in the accident investigations of the loss of one of the wings at cruise altitude on each of two [[Lockheed L-188 Electra#Civilian operations|Lockheed Electra]] turboprop powered aircraft (Flight 542 operated by [[Braniff Airlines]] in 1959 and Flight 710 operated by [[Northwest Orient Airlines]] in 1961) led to his wondering what the pilots may have said just prior to the wing loss and during the descent as well as the type and nature of any sounds or explosions that may have preceded or occurred during the wing loss.<ref name="pdfpiw.uspto.gov">[http://pdfpiw.uspto.gov/.piw?PageNum=0&docid=03327067 US Patent 3,327,067 for Cockpit Sound Recorder by Edmund A. Boniface, Jr.] {{Webarchive|url=https://web.archive.org/web/20170707070226/http://pdfpiw.uspto.gov/.piw?PageNum=0&docid=03327067 |date=July 7, 2017 }};</ref>

His patent was for a device for recording audio of pilot remarks and engine or other sounds to be "contained with the in-flight recorder within a sealed container that is shock mounted, fireproofed and made watertight" and "sealed in such a manner as to be capable of withstanding extreme temperatures during a crash fire". The CSR was an analog device which provided a continuous erasing/recording loop (lasting 30 or more minutes) of all sounds (explosion, voice, and the noise of any aircraft structural components undergoing serious fracture and breakage) which could be overheard in the cockpit.<ref name="pdfpiw.uspto.gov"/>

On November 1, 1966, Bobbie R. Allen - director of Bureau of Safety, Civil Aeronautics Board and John S. Leak - chief of Technical Services Section, presented "The Potential Role of Flight Recorders in Aircraft Accident Investigation" at the AIAA/CASI Joint Meeting on Aviation Safety, [[Toronto]], Canada.<ref name="AllenLeak1966">{{citation |last1=Allen |first1=B. R. |title=Aviation Safety Meeting |year=1966 |series=BOSP 7-4 |chapter=The potential role of flight recorders in aircraft accident investigation |publisher=U.S. Civil Aeronautics Board |doi=10.2514/6.1966-810 |last2=Leak |first2=John S.}}</ref>

== Terminology ==
[[File:J M Briscoe24 07 200713 05 14IMG2104 GEE AIRBORNE.JPG|thumb|[[Gee (navigation)|GEE]] airborne equipment, with the R1355 receiver on the left and the Indicator Unit Type 62A "black box" on the right.]]

The term "black box" was a World War II British phrase, originating with the development of radio, radar, and electronic navigational aids in British and Allied combat aircraft. These often-secret electronic devices were encased in non-reflective black boxes or housings.&nbsp; The earliest identified reference to "black boxes" occurs in a May 1945 ''[[Flight International|Flight]]'' article, "Radar for Airlines", describing the application of wartime RAF radar and navigational aids to civilian aircraft: "The stowage of the 'black boxes' and, even more important, the detrimental effect on performance of external aerials, still remain as a radio and radar problem."<ref>{{Cite web|url=https://www.flightglobal.com/pdfarchive/view/1946/1946%20-%200844.html|title=Flight, 'Radar for Airlines'|page=434|date=May 2, 1945|website=[[Flight International|Flight]] |access-date=February 13, 2019|archive-date=February 14, 2019|archive-url=https://web.archive.org/web/20190214002854/https://www.flightglobal.com/pdfarchive/view/1946/1946%20-%200844.html|url-status=live}}</ref> (The term "[[black box]]" is used with a different meaning in science and engineering, describing a system exclusively by its inputs and outputs, with no information whatsoever about its inner workings.)

Magnetic tape and wire voice recorders had been tested on [[Royal Air Force|RAF]] and [[United States Army Air Forces|USAAF]] bombers by 1943 thus adding to the assemblage of fielded and experimental electronic devices employed on Allied aircraft.&nbsp;As early as 1944 aviation writers envisioned use of these recording devices on commercial aircraft to aid incident investigations.<ref>{{Cite book|url=https://books.google.com/books?id=IObo37IFIXUC&q=Aerial+Eavesdropper|title=Flying, 'Aerial Eavesdropper'|last=Corddry|first=Charles Jr.|date=August 1944|pages=150|access-date=October 17, 2020|archive-date=January 25, 2022|archive-url=https://web.archive.org/web/20220125123855/https://books.google.com/books?id=IObo37IFIXUC&q=Aerial+Eavesdropper|url-status=live}}</ref> When modern flight recorders were proposed to the British [[Aeronautical Research Council]] in 1958, the term "black box" was in colloquial use by experts.<ref>[http://kenblackbox.com/other/The_ARL_Black_Box_Flight_Recorder.pdf] {{webarchive|url=https://web.archive.org/web/20140124051649/http://kenblackbox.com/other/The_ARL_Black_Box_Flight_Recorder.pdf|date=January 24, 2014}}</ref>

By 1967, when flight recorders were mandated by leading aviation countries, the expression had found its way into general use: "These so-called 'black boxes' are, in fact, of fluorescent flame-orange in colour."<ref>{{Cite web|url=https://www.flightglobal.com/pdfarchive/view/1967/1967%20-%201315.html|title=Flight, 'Saving the Record'|last=Scott|first=Geoffrey|date=December 14, 1967|website=www.flightglobal.com|page=1002|access-date=February 13, 2019|archive-date=February 14, 2019|archive-url=https://web.archive.org/web/20190214002903/https://www.flightglobal.com/pdfarchive/view/1967/1967%20-%201315.html|url-status=live}}</ref> The formal names of the devices are ''flight data recorder'' and ''cockpit voice recorder''. The recorders must be housed in boxes that are bright orange in color to make them more visually conspicuous in the debris after an accident.<ref name="BBC" />

== Components ==

=== Flight data recorder ===
{{Redirect|Flight data recorder|the song by +/-|Xs on Your Eyes}}
[[File:Black box.aeroplane.JPG|thumb|A typical flight recorder]]
[[File:Grossi-7.png|thumb|Cockpit voice recorder and flight data recorder, each with an [[underwater locator beacon]] on the front]]
[[File:Underwaterlocatorbeacon.JPG|thumb|An [[underwater locator beacon]]; the [[ballpoint pen]] provides scale]]
[[File:Two-In-One Data Recorder.JPG|thumb|A cockpit voice and data recorder (CVDR), with its attached ULB visible on the left side of the unit]]
[[File:Flightrecorders.JPG|thumb|A flight data recorder and a cockpit voice recorder installed on their mounting trays in the rear fuselage of an aircraft]]
[[File:东航MU5735班机第二部黑匣子寻获现场 Second Black box of crashed flight MU5735 retrieved 1.jpg|thumb|The flight data recorder for crashed flight [[MU5735]].]]
A flight data recorder (FDR; also ADR, for ''accident data recorder'') is an electronic device employed to record instructions sent to any electronic systems on an aircraft.

The data recorded by the FDR are used for [[accidents and incidents in aviation|accident and incident]] investigation. Due to their importance in investigating accidents, these [[International Civil Aviation Organization|ICAO]]-regulated devices are carefully engineered and constructed to withstand the force of a high speed impact and the heat of an intense fire. Contrary to the popular term "black box", the exterior of the FDR is coated with heat-resistant [[safety orange|bright orange]] paint for high visibility in wreckage, and the unit is usually mounted in the aircraft's [[empennage|tail section]], where it is more likely to survive a crash. Following an accident, the recovery of the FDR is usually a high priority for the investigating body, as analysis of the recorded parameters can often detect and identify causes or contributing factors.<ref name="TSO-C124b-3B"/>

Modern day FDRs receive inputs via specific data frames from the [[flight-data acquisition unit]]s. They record significant [[flight]] parameters, including the control and [[actuator]] positions, engine information and [[Timestamp|time of day]]. There are 88 parameters required as a minimum under current US federal regulations (only 29 were required until 2002), but some systems monitor many more variables. Generally each parameter is recorded a few times per [[second]], though some units store "bursts" of data at a much higher [[frequency]] if the data begin to change quickly. Most FDRs record approximately 17–25 hours of data in a continuous loop.{{citation needed|date=March 2014}} It is required by regulations that an FDR verification check (readout) is performed annually in order to verify that all mandatory parameters are recorded.{{citation needed|date=May 2015}} Many aircraft today are equipped with an "event" button in the cockpit that could be activated by the crew if an abnormality occurs in flight. Pushing the button places a signal on the recording, marking the time of the event.<ref>{{cite web|url=http://www.industrial-electronics.com/aircraft_18b.html|title=Aircraft Electronics + Electrical Systems: Flight data and cockpit voice recorders|website=industrial-electronics.com|publisher=A Measurement-Testing network|access-date=March 27, 2019|archive-date=November 11, 2018|archive-url=https://web.archive.org/web/20181111062649/http://www.industrial-electronics.com/aircraft_18b.html|url-status=live}}</ref>

Modern FDRs are typically double wrapped in strong [[corrosion]]-resistant [[stainless steel]] or [[titanium]], with high-temperature [[Thermal insulation|insulation]] inside. Modern FDRs are accompanied by an [[underwater locator beacon]] that emits an ultrasonic "ping" to aid in detection when submerged. These beacons operate for up to 30 days and are able to operate while immersed to a depth of up to {{convert|6000|m|ft|sp=us}}.<ref name="OSA"/><ref name="SSFDR" />

=== Cockpit voice recorder ===
[[File:Flightrecorder.jpg|thumb|Both side views of a cockpit voice recorder, one type of flight recorder]]
A cockpit voice recorder (CVR) is a flight recorder used to record the audio environment in the [[cockpit|flight deck]] of an [[aircraft]] for the purpose of investigation of accidents and incidents. This is typically achieved by recording the signals of the microphones and earphones of the pilots' headsets and of an area microphone in the roof of the cockpit. The current applicable [[FAA]] [[Technical Standard Order|TSO]] is C123b titled Cockpit Voice Recorder Equipment.<ref name="TSO-C123b"/>

Where an aircraft is required to carry a CVR and uses digital communications the CVR is required to record such communications with air traffic control unless this is recorded elsewhere. {{As of|2008}} it is an FAA requirement that the recording duration is a minimum of two hours.<ref name="359-FAR"/> The [[European Aviation Safety Agency]] increased the recording duration to 25 hours in 2021.<ref>{{Cite web |last=Bellamy III |first=Woodrow |date=2019-04-13 |title=L3 Has New Data, Voice Recorders for EASA's 2021 Mandate |url=https://www.aviationtoday.com/2019/04/13/l3-new-cockpit-recorders-easas-2021-mandate/ |access-date=2023-06-19 |website=Avionics International |language=en}}</ref> In 2023, the FAA proposed extending requirements to 25 hours to help in investigations like runway incursions.<ref>{{Cite web |last=Walsh |first=Amelia |date=2023-03-21 |title=FAA Proposes Extending Cockpit Voice Recording to 25 Hours |url=https://www.flyingmag.com/faa-proposes-extending-cockpit-voice-recording-to-25-hours/ |access-date=2023-06-19 |website=FLYING Magazine |language=en-US}}</ref><ref>{{Cite web |last=Wallace |first=Greg |date=2023-03-17 |title=The FAA proposes lengthening cockpit voice recording time to 25 hours - CBS Sacramento |url=https://www.cbsnews.com/sacramento/news/the-faa-proposes-lengthening-cockpit-voice-recording-time-to-25-hours/ |access-date=2023-06-19 |website=CBS News |language=en-US}}</ref> In a January 2024 press conference on [[Alaska Airlines Flight 1282]], [[National Transportation Safety Board]] (NTSB) chair Jennifer Homendy again called for extending retention to 25 hours, rather than the currently-mandated 2 hours, on all existing devices, rather than only newly manufactured ones.<ref>{{Cite web |last=Villamizar |first=Helwing |date=2024-01-08 |title=No Data on Flight 1282 Cockpit Voice Recorder, NTSB Calls out FAA |url=https://airwaysmag.com/no-data-1282-cockpit-recorder-ntsb/ |access-date=2024-01-08 |website=Airways |language=en-US}}</ref>

A standard CVR is capable of recording four channels of audio data for a period of two hours. The original requirement was for a CVR to record for 30 minutes, but this has been found to be insufficient in many cases because significant parts of the audio data needed for a subsequent investigation occurred more than 30 minutes before the end of the recording.<ref name=BlackBox30min.NYPost1999>{{cite news
   |newspaper=[[The New York Post]]
   |title=Learjet probe focuses on value replaced 2 days before crash
   |quote=The record works on a half hour loop, so it has no information about the crucial first hour
   |author=Tracy Connor |date=October 28, 1999 |page=18}}</ref>

The earliest CVRs used analog [[wire recording]], later replaced by analog [[magnetic tape]]. Some of the tape units used two reels, with the tape automatically reversing at each end. The original was the ARL Flight Memory Unit produced in 1957 by [[Australians|Australian]] [[David Warren (inventor)|David Warren]] and instrument maker [[Theon Numa (Tych) Mirfield|Tych Mirfield]].<ref>{{Cite web|title=ARL Flight Memory Recorder|url=https://collections.museumsvictoria.com.au/articles/3720|access-date=October 5, 2021|website=Museums Victoria Collections|archive-date=October 5, 2021|archive-url=https://web.archive.org/web/20211005184905/https://collections.museumsvictoria.com.au/articles/3720|url-status=live}}</ref><ref>{{Cite journal|last=Mirfield|first=Theon Neuma|date=May 1964|title=Miniature wire recording desks with limited memory|url=http://merfield.com/genealogy/theon-mirfield-1964-miniature-wire-recording-decks-with-limited-memory.zip|journal=The Australian Journal of Instrument Technology|volume=May|pages=94–100|access-date=October 20, 2019|archive-date=October 20, 2019|archive-url=https://web.archive.org/web/20191020065137/http://merfield.com/genealogy/theon-mirfield-1964-miniature-wire-recording-decks-with-limited-memory.zip|url-status=live}}</ref>

Other units used a single reel, with the tape spliced into a continuous loop, much as in an [[8-track cartridge]]. The tape would circulate and old audio information would be overwritten every 30 minutes. Recovery of sound from magnetic tape often proves difficult if the recorder is recovered from water and its housing has been breached. Thus, the latest designs employ [[Solid-state drive|solid-state memory]] and use fault tolerant [[digital recording]] techniques, making them much more resistant to shock, vibration and moisture. With the reduced power requirements of solid-state recorders, it is now practical to incorporate a battery in the units, so that recording can continue until flight termination, even if the aircraft electrical system fails.

Like the FDR, the CVR is typically mounted in the rear of the airplane [[fuselage]] to maximize the likelihood of its survival in a crash.<ref name="1457-FAR"/>

=== Combined units ===
With the advent of digital recorders, the FDR and CVR can be manufactured in one fireproof, shock proof, and waterproof container as a combined digital cockpit voice and data recorder (CVDR). Currently, CVDRs are manufactured by [[L3Harris Technologies]]<ref name="L-3"/> and [[Hensoldt]]<ref>{{cite web |title=Flight and mission data recording & management - SferiRec |url=https://www.hensoldt.net/solutions/air/situational-awareness/flight-and-mission-data-recording-management-sferirec/ |publisher=Hensoldt |date=2019 |access-date=August 12, 2019 |archive-date=August 12, 2019 |archive-url=https://web.archive.org/web/20190812202525/https://www.hensoldt.net/solutions/air/situational-awareness/flight-and-mission-data-recording-management-sferirec/ |url-status=live }}</ref> among others.

Solid state recorders became commercially practical in 1990, having the advantage of not requiring scheduled maintenance and making the data easier to retrieve. This was extended to the two-hour voice recording in 1995.<ref>{{cite web|title=History of Flight Recorders|url=http://www.l-3ar.com/html/history.html|archive-url=https://web.archive.org/web/20131211231050/http://www.l-3ar.com/html/history.html |publisher=L3 Flight Recorders|archive-date=December 11, 2013 }}</ref>

=== Additional equipment ===
Since the 1970s, most large civil jet transports have been additionally equipped with a "[[quick access recorder]]" (QAR). This records data on a removable storage medium. Access to the FDR and CVR is necessarily difficult because they must be fitted where they are most likely to survive an accident; they also require specialized equipment to read the recording. The QAR recording medium is readily removable and is designed to be read by equipment attached to a standard desktop computer. In many airlines, the quick access recordings are scanned for "events", an event being a significant deviation from normal operational parameters. This allows operational problems to be detected and eliminated before an accident or incident results.

A flight-data acquisition unit (FDAU) is a unit that receives various discrete, analog and digital parameters from a number of sensors and [[avionics|avionic]] systems and then routes them to the FDR and, if installed, to the QAR. Information from the FDAU to the FDR is sent via specific data frames, which depend on the aircraft manufacturer.

Many modern aircraft systems are [[fly-by-wire|digital or digitally controlled]]. Very often, the digital system will include [[built-in test equipment]] which records information about the operation of the system. This information may also be accessed to assist with the investigation of an accident or incident.

== Specifications ==
[[File:GravadoVoz.jpg|thumb|Cockpit voice recorder memory module of PR-GTD, a [[Gol Transportes Aéreos Flight 1907|Gol Transportes Aéreos Boeing 737-8EH SFP]], found in the [[Amazon Rainforest|Amazon]] in [[Mato Grosso]], [[Brazil]].]]
[[File:Caixa-Preta GOL.jpg|thumb|After the crash of [[Gol Transportes Aéreos Flight 1907]], [[Brazilian Air Force]] personnel show the recovered flight data recorder]]

The design of today's FDR is governed by the internationally recognized standards and recommended practices relating to flight recorders which are contained in [[ICAO]] Annex 6 which makes reference to industry [[crashworthiness]] and [[fire protection]] specifications such as those to be found in the European Organisation for Civil Aviation Equipment<ref name="Luftfahrt"/> documents EUROCAE ED55, ED56 Fiken A and ED112 (Minimum Operational Performance Specification for Crash Protected Airborne Recorder Systems). In the United States, the [[Federal Aviation Administration]] (FAA) regulates all aspects of US aviation, and cites [[design]] [[requirement]]s in their Technical Standard Order,<ref name="TSO-C124a"/> based on the EUROCAE documents (as do the aviation authorities of many other countries).

Currently, EUROCAE specifies that a recorder must be able to withstand an acceleration of 3400 ''[[g-force|g]]'' (33&nbsp;km/s<sup>2</sup>) for 6.5 [[millisecond]]s. This is roughly equivalent to an [[Impact (mechanics)|impact]] [[velocity]] of {{convert|270|kn|mph km/h}} and a [[deceleration]] or crushing distance of {{convert|45|cm|in|abbr=on}}.<ref>{{cite web|url=https://www.atsb.gov.au/publications/2014/black-box-flight-recorders/|title=Black box flight recorders|publisher=ATSB|date=April 1, 2014|access-date=October 7, 2016|archive-date=October 9, 2016|archive-url=https://web.archive.org/web/20161009170735/https://www.atsb.gov.au/publications/2014/black-box-flight-recorders/|url-status=live}}</ref> Additionally, there are [[requirement]]s for penetration resistance, [[Statics|static]] crush, high and low temperature [[fire]]s, deep sea [[pressure]], [[sea water]] immersion, and [[fluid]] immersion.

EUROCAE ED-112 (Minimum Operational Performance Specification for Crash Protected Airborne Recorder Systems) defines the minimum specification to be met for all aircraft requiring flight recorders for recording of flight data, cockpit audio, images and CNS / ATM digital messages and used for investigations of accidents or incidents.<ref name="VZLU"/> When issued in March 2003, ED-112 superseded previous ED-55 and ED-56A that were separate specifications for FDR and CVR. [[FAA]] [[Technical Standard Order|TSOs]] for FDR and CVR reference ED-112 for characteristics common to both types.

In order to facilitate recovery of the recorder from an aircraft accident site, they are required to be coloured bright yellow or orange with reflective surfaces. All are lettered "Flight recorder do not open" on one side in English and "''Enregistreur de vol ne pas ouvrir''"  in French on the other side. To assist recovery from submerged sites they must be equipped with an underwater locator beacon which is automatically activated in the event of an accident.

[[File:Bobbie R Allen - Potential Role of Flight Recorders - NTSB 1966.pdf|thumb|]]

== Regulation ==
The first attempt at a regulatory attempt to require flight data recorders occurred in April 1941, when the [[Civil Aeronautics Board]] (CAB) required flight recorders on passenger aircraft that would record the aircraft's altitude and whether the radio transmitter was turned on or off.<ref name="cab1966">{{cite book|title = The Potential Role of Flight Recorders in Aircraft Accident Investigation | date = December 1966 | publisher = Civil Aeronautics Board | last1 = Allen | first1 = B.R. | last2 = Leak | first2 = John S.}}</ref>{{rp|1}}  The compliance deadline for that regulation was extended several times, until June 1944 when the requirement was rescinded due to maintenance problems and the lack of parts due to World War 2.<ref name="cab1966"/>{{rp|1}}  A similar regulation was adopted in September 1947, which required recorders in aircraft of {{convert|10000|lbs}} or more, but that requirement was again rescinded in July 1948 because of a lack of availability of reliable devices.<ref name="cab1966"/>{{rp|1}}  In August 1957, the CAB adopted amendments to flight regulations that required the installation of flight recorders by July 1958 in all aircraft over {{convert|12500|lbs}} and that were operated at altitudes over 25,000 feet.<ref name="cab1966"/>{{rp|1-2}}  The requirements were further amended in September 1959, requiring the retention of records for 60 days, and the operation of the flight recorders continuously from the time of takeoff roll to the completion of the landing roll.<ref name="cab1966"/>{{rp|2}}

In the investigation of the 1960 crash of [[Trans Australia Airlines Flight 538]] at Mackay, [[Queensland]], the inquiry judge strongly recommended that flight recorders be installed in all Australian airliners. Australia became the first country in the world to make cockpit-voice recording compulsory.<ref name="warren"/><ref name="Campbell"/>

[[File:DFDR from Flight 294.png|thumb|The digital flight data recorder from [[West Air Sweden Flight 294]]. All data was collected, even though the rest of the aircraft was heavily fragmented]]

The United States' first cockpit voice recorder rules were passed in 1964, requiring all turbine and piston aircraft with four or more engines to have CVRs by March 1, 1967.<ref name="Komos"/> {{As of|2008}} it is an FAA requirement that the CVR recording duration is a minimum of two hours,<ref name="359-FAR"/> following the NTSB recommendation that it should be increased from its previously mandated 30-minute duration.<ref name="ntsb-recorders"/> From 2014 the United States requires flight data recorders and cockpit voice recorders on aircraft that have 20 or more passenger seats, or those that have six or more passenger seats, are turbine-powered, and require two pilots.<ref name="14CFR91.609"/>

For US air carriers and manufacturers, the NTSB is responsible for investigating accidents and safety-related incidents. The NTSB also serves in an advisory role for many international investigations not under its formal jurisdiction. The NTSB does not have regulatory authority, but must depend on legislation and other government agencies to act on its safety recommendations.<ref name="NTSB History"/> In addition, 49 USC Section 1114(c) prohibits the NTSB from making the audio recordings public except by written transcript.<ref>{{cite web |url=https://www.ntsb.gov/investigations/process/Documents/CVR_Handbook.pdf |title=CVR Handbook |website=www.ntsb.gov |access-date=June 29, 2020 |archive-date=September 3, 2020 |archive-url=https://web.archive.org/web/20200903233512/https://www.ntsb.gov/investigations/process/Documents/CVR_Handbook.pdf |url-status=live }}</ref>

The [[ARINC]] Standards are prepared by the Airlines Electronic Engineering Committee (AEEC). The 700 Series of standards describe the form, fit, and function of avionics equipment installed predominately on transport category aircraft. The FDR is defined by ARINC Characteristic 747. The CVR is defined by ARINC Characteristic 757.<ref>{{cite web |url=https://arinc.com/cf/store/catalog.cfm?prod_group_id=1&category_group_id=4 |title=ARINC Store, 700 series |access-date=November 12, 2015 |archive-url=https://web.archive.org/web/20110814000656/https://www.arinc.com/cf/store/catalog.cfm?prod_group_id=1&category_group_id=4 |archive-date=August 14, 2011 |url-status=dead }}</ref>

Post incident overwriting of voice data by Nigerian crews led to a 2023 All Operators Letter reinforcing that practice is forbidden.<ref>{{Cite web |title=RE: Continuous Overwriting of Cockpit Voice Recorder (CVR) Information. NCAA |url=https://ncaa.gov.ng/media/nbhfn4sg/aol-dgca-on-overwrting-cvr.pdf|access-date=2024-01-09 |publisher=Nigeria Civil Aviation Authority|quote=The Nigeria Civil Aviation Authority (NCAA) had noticed that some airline operators' flight crew members were in the practice of continuously overwriting the CVR information after an occurrence. This practice makes it practically impossible for the Nigerian Safety Investigation Bureau (NSIB) to retrieve actual data to aid in its investigation}}</ref><ref>{{Cite web |last=Shadare |first=Wole |date=2023-07-27 |title=Airlines Doctor Cockpit Voice Recorder To Hide Serious Incidents, Accidents |url=https://newtelegraphng.com/airlines-doctor-cockpit-voice-recorder-to-hide-serious-incidents-accidents/ |access-date=2024-01-09 |website=New Telegraph |language=en-US|quote=airlines indulge in the unprofessional act in order to circumvent investigation by the Nigeria Safety Investigation Bureau (NSIB).[...] safety managers stated that some airlines have consistently indulged in this unwholesome practice, which could impact safety negatively. The NCAA and the NSIB had in the wake of the report of the incident involving Max Air’s B747 incident expressed concern over the incessant occurrence of the issue with airlines. }}</ref>

=== Proposed requirements ===

==== Deployable recorders ====
The NTSB recommended in 1999 that operators be required to install two sets of CVDR systems, with the second CVDR designed to be ejected from the aircraft prior to impact with the ground or water. Ejection would be initiated by computer based on sensor information indicating an accident is imminent. A deployable recorder combines the cockpit voice/flight data recorders and an emergency locator transmitter (ELT) in a single unit. The unit would be designed to eject and float away from the aircraft and survive its descent to the ground, or float on water indefinitely. It would be equipped with satellite technology to aid in prompt recovery. Deployable CVDR technology has been used by the US Navy since 1993.<ref name="aviationtoday.com"/>

While the recommendations would involve a massive, expensive retrofit program, government funding would meet cost objections from manufacturers and airlines. Operators would get both sets of recorders (including the currently-used fixed recorder) free of charge. The cost of the second deployable/ejectable CVDR (or black box) was estimated at US$30 million for installation in 500 new aircraft (about $60,000 per new commercial plane).{{citation needed|date=June 2016}}

In the United States, the proposed SAFE Act calls for implementing the NTSB 1999 recommendations. However, so far the proposed legislation has failed to pass [[United States Congress|Congress]], having been introduced in 2003 (H.R. 2632), in 2005 (H.R. 3336), and in 2007 (H.R. 4336).<ref name="HT3336"/> Originally the Safe Aviation Flight Enhancement (SAFE) Act of 2003<ref>{{cite web |url=https://www.govtrack.us/congress/bills/108/hr2632/text |title=Text of the Safe Aviation and Flight Enhancement Act-((SAFE) Act of 2003) |access-date=August 2, 2015 |via=govtrack.us |archive-date=September 25, 2015 |archive-url=https://web.archive.org/web/20150925113645/https://www.govtrack.us/congress/bills/108/hr2632/text |url-status=live }}</ref> was introduced on June 26, 2003, by Congressman [[David Price (American politician)|David Price]] (D-NC) and Congressman [[Jimmy Duncan (politician)|John Duncan]] (R-Tenn.) in a bipartisan effort to ensure investigators have access to information immediately following accidents to [[transport category]] aircraft.<ref name="aviationtoday.com"/>

On July 19, 2005, a revised proposal for a SAFE Act was introduced and referred to the Committee on Transportation and Infrastructure of the US House of Representatives. The bill was referred to the House Subcommittee on Aviation during the 108th, 109th, and 110th Congresses.<ref name="HR2632"/><ref name="HT3336-2"/><ref name="HR4336"/>

==== After Malaysia Airlines Flight 370 ====
In the United States, on March 12, 2014, in response to the missing [[Malaysia Airlines Flight 370]], [[David Price (American politician)|David Price]] re-introduced the SAFE Act in the US House of Representatives.<ref name="Jansen"/>

The disappearance of Malaysia Airlines Flight 370 demonstrated the limits of the contemporary flight recorder technology, namely how physical possession of the flight recorder device is necessary to help investigate the cause of an aircraft incident. Considering the advances of modern communication, technology commentators called for flight recorders to be supplemented or replaced by a system that provides "live streaming" of data from the aircraft to the ground.<ref name="Trimble"/><ref name="CBC"/><ref name="Conversation"/> Furthermore, commentators called for the underwater locator beacon's range and battery life to be extended, as well as the outfitting of civil aircraft with the deployable flight recorders typically used in military aircraft. Previous to MH370, the investigators of 2009 [[Air France Flight 447]] urged that the battery life be extended as "rapidly as possible" after the crash's flight recorders went unrecovered for over a year.<ref name="SMH"/>

==== After Indonesia AirAsia Flight 8501 ====
On December 28, 2014, [[Indonesia AirAsia Flight 8501]], en route from [[Surabaya]], Indonesia, to [[Singapore]], crashed in bad weather, killing all 155 passengers and seven crew on board.<ref name="bbc1">{{cite news |url=https://www.bbc.co.uk/news/world-asia-30647375 |title=AirAsia QZ8501: More bad weather hits AirAsia search |date=January 1, 2015 |work=[[BBC News]] |access-date=June 21, 2018 |archive-date=August 15, 2018 |archive-url=https://web.archive.org/web/20180815053318/https://www.bbc.co.uk/news/world-asia-30647375 |url-status=live }}</ref>

On January 8, 2015, before the recovery of the flight recorders, an anonymous [[ICAO]] representative said: "The time has come that deployable recorders are going to get a serious look."<ref name=":0">{{Cite news|last1=Lampert|first2=Allison|last2= Martell|first1= Allison|date=January 8, 2015|title=AirAsia crash makes case for ejectable black boxes|language=en|work=Reuters|url=https://www.reuters.com/article/us-indonesia-plane-blackboxes-analysis-idUSKBN0KH0BX20150108|access-date=January 5, 2021|archive-date=October 12, 2019|archive-url=https://web.archive.org/web/20191012021257/https://www.reuters.com/article/us-indonesia-plane-blackboxes-analysis-idUSKBN0KH0BX20150108|url-status=live}}</ref> A second ICAO official said that public attention had "galvanized momentum in favour of ejectable recorders on commercial aircraft".<ref name=":0" />

==== Boeing 737 MAX ====
Live flight data streaming as on the [[ecoDemonstrator#2018: Boeing 777F|Boeing 777F ecoDemonstrator]], plus 20 minutes of data before and after a triggering event, could have removed the uncertainty before the [[Boeing 737 MAX groundings]] following the March 2019 [[Ethiopian Airlines Flight 302]] crash.<ref>{{cite news |url=https://aviationweek.com/commercial-aviation/opinion-time-ripe-live-flight-data-streaming |title=Opinion: The Time Is Ripe for Live Flight Data Streaming |date=March 22, 2019 |work=[[Aviation Week & Space Technology]] |access-date=March 22, 2019 |archive-date=January 25, 2022 |archive-url=https://web.archive.org/web/20220125123832/https://aviationweek.com/air-transport/opinion-time-ripe-live-flight-data-streaming |url-status=live }}</ref> In the [[Alaska Airlines Flight 1282]] accident, the Cockpit Voice Recorder functioned properly but the data was overwritten as the CVR remained powered, and functioning. The critical accident data was overwritten by over two hours of post-incident sounds until a maintenance crew could enter the aircraft after the incident and power down the CVR.<ref>{{Cite news |last=Villamizar |first=Helwing |date=2024-01-08 |title=No Data on Flight 1282 Cockpit Voice Recorder, NTSB Calls out FAA |url=https://airwaysmag.com/no-data-1282-cockpit-recorder-ntsb/ |access-date=2024-01-09 |publisher=Airways Publishing, LLC|language=en-US|quote=The NTSB sent the cockpit voice recorder (CVR) and flight data recorder (FDR) to their labs. They will use data from the FDR to narrow down the area to search for the door plug. However, the CVR was completely overwritten, meaning there is nothing on the CVR. The CVR overwrites every two hours. }}</ref><ref>{{Cite news |last=Nesi|first=Chris|date=2024-01-08 |title=Black box recorder from imperiled Alaska Airlines flight completely erased: 'We have nothing' |publisher=[[New York Post]]|url=https://nypost.com/2024/01/08/news/black-box-recorder-from-imperiled-alaska-airlines-flight-completely-erased-we-have-nothing/ |access-date=2024-01-09 |language=en-US}}</ref>

==== Image recorders ====
The NTSB has asked for the installation of cockpit image recorders in large transport aircraft to provide information that would supplement existing CVR and FDR data in accident investigations. They have recommended that image recorders be placed into smaller aircraft that are not required to have a CVR or FDR.<ref name="ntsb"/> The rationale is that what is seen on an instrument by the pilots of an aircraft is not necessarily the same as the data sent to the display device. This is particularly true of aircraft equipped with electronic displays ([[Cathode-ray tube|CRT]] or [[Liquid crystal display|LCD]]). A mechanical instrument panel is likely to preserve its last indications, but this is not the case with an electronic display. Such systems, estimated to cost less than $8,000 installed, typically consist of a camera and microphone located in the cockpit to continuously record cockpit instrumentation, the outside viewing area, engine sounds, radio communications, and ambient cockpit sounds. As with conventional CVRs and FDRs, data from such a system is stored in a crash-protected unit to ensure survivability.<ref name="ntsb" />{{better source needed example|reason=unclear where this source says this|date=July 2019}} Since the recorders can sometimes be crushed into unreadable pieces, or even located in deep water, some modern units are self-ejecting (taking advantage of [[kinetic energy]] at impact to separate themselves from the aircraft) and also equipped with [[radio]] [[emergency locator transmitter]]s and [[sonar]] underwater locator beacons to aid in their location.<ref>{{Cite web|title=These Black Boxes Are Designed to Eject Themselves in a Plane Crash|url=https://www.travelandleisure.com/airlines-airports/airbus-self-ejecting-black-boxes|access-date=October 5, 2021|website=Travel + Leisure|language=en|archive-date=October 5, 2021|archive-url=https://web.archive.org/web/20211005220134/https://www.travelandleisure.com/airlines-airports/airbus-self-ejecting-black-boxes|url-status=live}}</ref>

== Cultural references ==
{{In popular culture|section|date=March 2022}}
* The artwork for the band [[Rammstein]]'s album ''[[Reise, Reise]]'' is made to look like a CVR; it also includes a recording from a crash. The recording is from the last 1–2 minutes of the CVR of [[Japan Airlines Flight 123]], which crashed on August 12, 1985, killing 520 people; JAL123 is the deadliest single-aircraft disaster in history.<ref>{{cite web |last1=Beckner |first1=Justin |title=The Easter Egg Hidden on Rammstein's 'Reise, Reise' Album |url=https://www.ultimate-guitar.com/articles/features/the_easter_egg_hidden_on_rammsteins_reise_reise_album-140390 |website=UltimateGuitar |access-date=17 July 2023}}</ref>
* Members of the performing arts collective [[Collective:Unconscious]] made a theatrical presentation of a play called ''[[Charlie Victor Romeo]]'' with a script based on transcripts from CVR voice recordings of nine aircraft emergencies. The play features the famous [[United Airlines Flight 232]] that crash-landed in a cornfield near [[Sioux City]], [[Iowa]], after suffering a catastrophic failure of one engine and most flight controls.<ref name="CVR"/>
* ''[[Survivor (Palahniuk novel)|Survivor]]'', a novel by American author [[Chuck Palahniuk]], is about a [[cult]] member who dictates his life story to a flight recorder before the plane runs out of fuel and crashes.<ref>{{cite book |title=Survivor Summary & Study Guide |url=http://www.bookrags.com/studyguide-survivor/#gsc.tab=0 |via=Bookrags |access-date=17 July 2023}}</ref>
* In [[stand-up comedy]], many jokes have been made asking why the entire airplane is not made out of the material used to make black boxes, given that the black box survives the crash. This is referenced in the 2001 [[Chris Rock]] movie ''[[Down to Earth (2001 film)|Down to Earth]]'',<ref>{{cite web |title=Down to Earth Movie Script |url=https://www.scripts.com/script/down_to_earth_7192 |website=Scripts.com |access-date=17 July 2023}}</ref> although the original joke is widely credited to [[George Carlin]].<ref>{{cite web |title=Quote by George Carlin |url=https://www.goodreads.com/quotes/87386-if-the-black-box-flight-recorder-is-never-damaged-during |website=Goodreads |access-date=17 July 2023}}</ref>

== See also ==
{{Portal|Aviation}}
<!-- PLEASE RESPECT ALPHABETICAL ORDER -->
* [[Acronyms and abbreviations in avionics]]
* [[Data logger]]
* [[Emergency locator beacon]]
* [[Emergency position-indicating radiobeacon station]]
* [[Event data recorder]]
* [[Flight operations quality assurance]]
* [[Korean Air Lines Flight 007]]
* [[List of unrecovered and unusable flight recorders]]
* [[Quick access recorder]]
* [[Record and replay debugging|Software flight recorder]]
* [[Train event recorder]]
* [[Voyage data recorder]]

== References ==
{{Reflist|refs=
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<ref name="Fayer">Jean-Claude Fayer, ''Vols d'essais: Le Centre d'Essais en Vol de 1945 à 1960'', published by E.T.A.I. (Paris), 2001, 384 pages, {{ISBN|2-7268-8534-9}}</ref>
<ref name="Beaudouin-2">Page 206 and 209 of Beaudouin & Beaudouin</ref>
<ref name="DSTO">{{cite web |title=Dave Warren – Inventor of the black box flight recorder |url=http://www.dsto.defence.gov.au/page/3383/ |publisher=[[Defence Science and Technology Group|Defence Science and Technology Organisation]] |archive-url=https://web.archive.org/web/20110706121421/http://www.dsto.defence.gov.au/page/3383/ |archive-date=July 6, 2011}}</ref>
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}}

== Further reading ==
* American Aviation Historical Society, Volume 59, Fall-Winter 2014, [http://www.aahs-online.org/journals/journal_template.php?vol_no=v59n34 "Edmund A. Boniface, Jr.: Inventing the Cockpit Sound Recorder"] {{Webarchive|url=https://web.archive.org/web/20150402102225/http://www.aahs-online.org/journals/journal_template.php?vol_no=v59n34 |date=April 2, 2015 }}
* [https://web.archive.org/web/20120404094401/http://www.uofaweb.ualberta.ca/uofaengineer/article.cfm?article=34604&issue=34329 "Extraordinary Inventor"], ''U of A Engineer Magazine'', Winter 2005
* (''Survivors''), [https://web.archive.org/web/20131002141527/http://www.nrc-cnrc.gc.ca/eng/education/innovations/discoveries/fallen_aircraft.html "Saving Survivors by Finding Fallen {{sic|nolink=yes|Aircrafts}}"], NRC, 2008-03-05
* Jeremy Sear, [https://web.archive.org/web/20111002235729/http://jeremy.110mb.com/blackbox.htm "The ARL 'Black Box' Flight Recorder"], University of Melbourne, October 2001
* {{cite book |last=Siegel |first=Greg |title=Forensic Media: Reconstructing Accidents in Accelerated Modernity |chapter-url=https://books.google.com/books?id=dX_VBQAAQBAJ&pg=PT137 |chapter=Chapter 3. Black Boxes|date=2014 |publisher=Duke University Press |isbn=978-0-8223-7623-1 |pages=89–142}}
* {{cite book |last1=Wyatt |first1=David |author2=Mike Tooley|title=Aircraft Electrical and Electronic Systems |chapter-url=https://books.google.com/books?id=-_cJBAAAQBAJ&pg=PA321 |date=2009 |publisher=Routledge |isbn=978-1-136-44435-7 |page=321 |chapter=Chapter 18. Flight data and cockpit voice recorders}}
* {{cite news |url= http://www.mro-network.com/engineering-design/flight-data-recorder-evolution-where-next |title= Flight Data Recorder Evolution: Where Next? |author= Ben Hargreaves |date= April 13, 2017 |work= MRO-network |publisher= Aviation Week |url-status=dead |archive-url=https://web.archive.org/web/20181116161524/https://www.mro-network.com/engineering-design/flight-data-recorder-evolution-where-next |archive-date= Nov 16, 2018 }}

== External links ==
{{Commons category-inline}}
* [https://www.tailstrike.com/database.htm Cockpit Voice Recorder Database]
* [https://web.archive.org/web/20111002235729/http://jeremy.110mb.com/blackbox.htm 'The ARL 'Black Box' Flight Recorder']: Melbourne University history honors thesis on the development of the first cockpit voice recorder by David Warren
* [http://siiri.tampere.fi/displayContent.do?uri=http://siiri.tampere.fi/content/20120601/13401000039090.jpg&type=big Finnish Mata-Hari Flight Recorder in Museums of Tampere City]
* [https://spectrum.ieee.org/beyond-the-black-box "Beyond the Black Box: Instead of storing flight data on board, aircraft could easily send the information in real time to the ground"], by Krishna M. Kavi, ''IEEE Spectrum'', August 2010
* {{cite web|url=http://www1.umn.edu/umnnews/UMN_home/know/A_crash_course_in_transportation_safety.html |title=A crash course in transportation safety |access-date=April 7, 2014 |url-status=dead |archive-url=https://web.archive.org/web/20090211220120/http://www1.umn.edu/umnnews/UMN_home/know/A_crash_course_in_transportation_safety.html |archive-date=February 11, 2009 }}
* [https://web.archive.org/web/20130514175925/http://www.abc.net.au/dimensions/dimensions_future/Transcripts/s642790.htm David Warren interview transcript 2002], ABC TV (Australia)
* [https://web.archive.org/web/20140401001733/http://www.abc.net.au/dimensions/dimensions_future/Transcripts/s850016.htm David Warren interview transcript 2003], ABC TV (Australia)
* [http://www.etep.com/ etep, Flight Recorder designer]
* [http://www.heavytruckedr.org/ Heavy Vehicle EDR] {{Webarchive|url=https://web.archive.org/web/20110208203242/http://heavytruckedr.org/ |date=February 8, 2011 }} information site for black box technology
* {{howStuffWorks|page=black-box|title=How Black Boxes Work}}
* [http://www.irig106.org/ IRIG 106 Chapter 10]: Flight data recorder digital recorder standard
* [https://web.archive.org/web/20140317173459/https://www.ntsb.gov/news/2004/041020b.htm Public domain photos of recorders]
* [https://web.archive.org/web/20080509192756/http://www.popularmechanics.com/blogs/science_news/4255108.html Popular Mechanics, March 19, 2008]
* [https://web.archive.org/web/20140319035000/http://www1.umn.edu/news/features/2005/UR_75433_REGION1.html "His Crashes Helped Make Ours Less Dangerous"]
* {{patent|US|3075192|James J. Ryan: "Coding Apparatus for Flight Recorders and the Like"}}
* [https://www.finna.fi/Record/siiri.urn%3Anbn%3Afi-vapriikkihttp%253A%252F%252Fwww.profium.com%252Farchive%252FArchivedObject-BFF818F3-55B9-311B-4EDA-926056327D16 First modern flight recorder "Mata Hari" at display in Tampere] [[Vapriikki Museum Centre]].

{{Aircraft components}}
{{Aircraft gas turbine engine components}}
{{Commercial air travel}}
{{NTSB}}
{{Authority control}}

[[Category:Aircraft recorders]]
[[Category:Australian inventions]]
[[Category:Aviation safety]]
[[Category:Avionics]]
[[Category:Defence Science and Technology Organisation]]
[[Category:Vehicle design]]
[[Category:Aircraft emergency systems]]
[[Category:Beacons]]
[[Category:Rescue equipment]]
[[Category:Aircraft components]]
[[Category:Recording devices]]
[[Category:Articles containing video clips]]