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45 votes
Accepted

Where can I listen to the actual cockpit voice recorder audio from US Airways Flight 1549?

You can't, because it is in fact forbidden to release CVR audio under US law. From the NTSB: The CVR recordings are treated differently than the other factual information obtained in an accident ...
Sanchises's user avatar
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39 votes
Accepted

When are black boxes used?

There are two recorders that are mandatory on board commercial aircraft: CVR for voice, and FDR for data. They are designed to survive an accident and include an ultrasonic beacon to facilitate ...
mins's user avatar
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24 votes
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What triggers a CVR to start recording?

The CVR (and FDR) are continuously recording while the aircraft is in operation. In the days of magnetic tape, this was done with a continuous loop. In digital systems, the same is emulated by ...
StephenS's user avatar
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20 votes

When are black boxes used?

Addressing just your first item, the purpose of the cockpit voice recorder is to provide a record of all sounds in the cockpit from the time the recording stops back to however long the recording loop ...
Terry's user avatar
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12 votes

Why are FDRs and CVRs still two separate physical devices?

Many new aircraft, starting with the Boeing 787, are equipped with enhanced airborne flight recorders (EAFR). EAFRs are designed to the ARINC 767 architecture (described here). They combine the ...
Gerry's user avatar
  • 20k
12 votes

Why are cockpit voice recorders limited to 2 hours recording?

Aviation manufacturers generally design the equipment to comply with legal requirements. Under FAA two hours is what is required by law. 14 CFR 121.359–Operating Requirements: Domestic, Flag, and ...
TomMcW's user avatar
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11 votes

What triggers a CVR to start recording?

CVRs are normally active as soon as one of the basic electrical buses, like the battery bus, or emergency bus, is energized. So if the airplane has a BATTERY MASTER switch or similar, it is recording ...
John K's user avatar
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10 votes

Where can I listen to the actual cockpit voice recorder audio from US Airways Flight 1549?

You can't listen to it due to the regulation mentioned in Sanchises' answer, but you can find the transcripts. There is one here, for example.
reirab's user avatar
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7 votes

Why are cockpit voice recorders limited to 2 hours recording?

With today's technology in memory storage, where simple voice recorders can record virtually endless durations, why are CVRs limited to only 2 hours. Is it the eternal "cost vs benefit" reason? ...
Dave's user avatar
  • 101k
6 votes

Is there somewhere I can download real FDR data?

The only cases I'm aware of where you can do that is when the NTSB publishes it in an accident report. Otherwise, that data is considered proprietary to the aircraft operator & isn't disclosed to ...
Ralph J's user avatar
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6 votes
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How did the long loop of tape in a magnetic cockpit voice recorder work?

Most looped tape mechanisms are a variation of this: (this is an 8-track audio cassette) The tape is pulled from the center of the spool, and fed back to the outside of the spool. Some CVRs use ...
Hobbes's user avatar
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6 votes

When are black boxes used?

When are black boxes used? / How often and for what purpose is black box data used? Recording Reading Accident investigation Operational testing Annual Daily Other purposes Used for recording ...
RedGrittyBrick's user avatar
5 votes
Accepted

What is the smallest aircraft to have a CVR / FDR?

Looks like in the EU as well as in the US the Cessna CE-510 Mustang needs one according to the minimum equipment list. In the EU -70-01 *** Cockpit Voice Recorder (For Combined Voice Data ...
Dave's user avatar
  • 101k
4 votes

Are CVR and FDR reset after every flight?

No, they are not reset after each flight, but as commented, the FDR and CVR are on a loop, and just keep recording over the old data. For US registered aircraft, FAA Regulation "14 CFR 91.609" covers ...
Penguin's user avatar
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4 votes
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Which was the last Boeing crash that didn't send its black boxes back to the US?

Please refer to the following website for more details https://slate.com/technology/2019/03/ethiopian-airlines-737-max-black-box-sent-to-paris-why.html The International Civil Aviation Organization, ...
user40476's user avatar
  • 1,797
4 votes

Why are expletives deleted in CVR transcripts?

[O]ughtn't authenticity outweigh relevance? The goal of a CVR transcript is not to give an authentic account of what happened in a cockpit. It is to give a relevant account of what happened in the ...
Sanchises's user avatar
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4 votes
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Detecting faults in CVR mic inputs

Interesting question. On the Boeing 727 there is a panel named "Cockpit Voice Recorder Microphone Monitor". A headphone can be plugged into the labelled jack to test if the cockpit voice recorder ...
Juan Jimenez's user avatar
4 votes

Why could increases in cockpit voice and image recording potentially raise privacy concerns?

I will answer this question with the caveat that it is asking for an opinion, and therefore your experience may vary due to different regulatory authorities. I answer this question from an Australian ...
Craig's user avatar
  • 1,013
3 votes

How did the CVR of Bashkirian Airlines Flight 2937 keep recording after the collision?

A CVR has no wireless capability. So clearly the CVR in Flight 2937 was somewhere forward of the location where the plane was split in half. It is common for the CVR to be placed fairly far aft, but ...
Chris's user avatar
  • 16k
3 votes

What triggers a CVR to start recording?

By legal requirement, the CVR must be operated from the start of the first checklist (typically Cockpit Preparation or similar checklist), until after the reading of the final checklist. The CVR can ...
Will's user avatar
  • 1,107
3 votes

Why are FDRs and CVRs still two separate physical devices?

The Cockpit Voice Recorder and Flight Data Recorder are the same unit on many modern aircraft and are widely available at vendors such as this resale outlet and direct from vendors like Universal.
Mark Jones Jr.'s user avatar
3 votes

How can the CVR from a Cessna 560XL only contain old records and none from the fatal accident?

The FDR and CVR are not magical, they can fail. So can the components of the aircraft that feed them data. E.g. if there were something wrong with the microphones in the cockpit, the CVR would not ...
jwenting's user avatar
  • 16.1k
3 votes

Why doesn't the black box also record video?

Why does the black box still only record the cockpit's audio The Black Box There isn't a single black box. There is normally a Flight Data Recorder (FDR) and a separate Cockpit Voice Recorder (CVR) ...
RedGrittyBrick's user avatar
2 votes

How to find black boxes underwater absent any pinger signals?

The CVR on a Boeing 737 is located in the aft cargo compartment. The CVR itself is not built of the same materials as the aircraft, which is mostly aluminium and composites. By mapping the location of ...
Juan Jimenez's user avatar
2 votes

Why aren't the CVR and FDR required to store data for a longer period?

CVRs typically store two hours of voice recordings (source). It simply wouldn't serve any purpose to store longer recordings. It is extremely rare for an emergency to last for such an extended time. ...
abelenky's user avatar
  • 30.7k
1 vote

What does the “test result indicator” indicate on a cockpit voice recorder?

I could not find the exact model you showed, but the A330 and A340 FCOM on SmartCockpit shows a similar one. Unfortunately the description of the test is rather short: The Overhead Pushbutton ...
Bianfable's user avatar
  • 56.4k
1 vote

Why do black boxes seem so outdated?

This should be split into two questions as mentioned. The First one is addressed elsewhere on this site but the second one is worth noting. Why does it only give off sonar signals and not high ...
Dave's user avatar
  • 101k

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