Questions tagged [cockpit-voice-recorder]

A cockpit voice recorder (CVR) is one of two flight recorders ("black boxes"), used to record audio in the cockpit for the purpose of investigation of accidents and incidents.

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3
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1answer
135 views

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

I am really curious as to what the “green/red” strip of led indicate and the numbers below it. Having read around the web, i speculated that it could be an audio quality rating scale. Would help alot ...
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1answer
218 views

Which was the last Boeing crash that didn't send its black boxes back to the US?

I couldn't find an answer online, so I am asking the community. The real question is how frequent it is for a Boeing crash not to send the black boxes back to the USA, and a reply to title's question ...
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1answer
199 views

Why are expletives deleted in CVR transcripts?

I was reading this when I envisioned this question. In this age, I don't think expletives can offend anyone. They may not be germane, but oughtn`t authenticity outweigh relevance?
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Where can I listen to the actual cockpit voice recorder audio from US Airways Flight 1549? [duplicate]

I have searched for the audio recorded on the CVR from the US Airways Flight 1549, but all clips and audios I found seems to be audio recorded from the flight control and not from microphones inside ...
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556 views

How to find black boxes underwater absent any pinger signals?

If CVR/FDR cannot be seen visually on the seafloor (because covered by a thick layer of mud/sediments) and no pinger signals are detected, how can they be found? Metal detectors? Any other methods? ...
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1answer
157 views

Detecting faults in CVR mic inputs

Years ago my father worked for Eastern Airlines out of Miami (that should give you a timeframe) and he was an electrical engineer. I recall once he told me that the pilots (one or more) used to ...
5
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1answer
731 views

What is the meaning of HOT-1, HOT-2, CAM, etc., in cockpit voice recorder transcripts?

When reading the the written down recordings of CVR like here, for instance, it is common to see abbreviations like HOT-1, HOT-2 or CAM. I guess that CVR records multiple channels and the codes ...
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1answer
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Why doesn't the black box also record video? [duplicate]

Why does the black box still only record the cockpit's audio today, rather than also recording video of the cockpit? Wouldn't a video of the pilots' actions and what they were seeing outside the plane ...
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Are CVR and FDR reset after every flight?

Recording the thousands of parameters and voice conversations must take a huge amount of storage, and so I am wondering, how frequently is this data "deleted", so it can be used again? For example, ...
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1answer
653 views

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

I was wondering what is the smallest aircraft to have a CVR (Cockpit Voice Recorder) and/or FDR (Flight Data Recorder)? Small single engine prop can sometimes have the avionics, like the G1000, that ...
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1answer
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Why aren't the CVR and FDR required to store data for a longer period? [duplicate]

I'll be honest I don't know a lot about the brand new airplanes, but one think I do recall a lot of from reading accident reports is that they typically only recorded the last 30 minutes of data. ...
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What was the first aircraft fitted with both an FDR & CVR?

What was the first production aircraft to be fitted with a Flight Data Recorder (FDR) and Cockpit Voice Recorder (CVR) as standard by the manufacturer?
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1answer
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Why do black boxes seem so outdated? [duplicate]

Now that the Malaysian flight was again in the news, that they had officially given up and stopped searching, this issue comes to mind again. Why do w all depend on finding a physical recorder, and ...
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When are black boxes used?

Obviously, black boxes gather lots of media attention after tragic accidents where planes crash or explode mid-flight, since they could be crucial understanding the crash. However, these are rather ...
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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? ...
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Was there any Hawker Trident installed cockpit voice recorder before BEA Flight 548 incident?

After BEA Flight 548 incident in June 1972, all British-registered airliners have mandatory cockpit voice recorders. The TV series Mayday claimed no voice recorders were installed in Hawker Tridents ...
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1answer
307 views

In what manner does the Cockpit Voice Recorder timestamps?

See here the transcript of ending moments of Aeroflot Flight 593 . The Wikipedia writes : (N.B.: All timestamps refer to the flight data recorder time, not GMT or local time.) What do 2265,2266......
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How does a CVR / FDR determine when to stop recording?

For example, the CVR records only about 2 hours of data. Overwriting important data must be avoided, and thus the recorders should know if a catastrophe has happened. Then they can stop recording (to ...
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Are military aircraft required to have black boxes?

In the United States, the FAA requires certain types of aircraft to have a Flight Data Recorder (FDR) and/or Cockpit Voice Recorder (CVR). I understand these regulations to apply mostly to civil ...
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411 views

Can noise from the passenger cabin be picked up by the cockpit voice recorder?

How sensitive is the cockpit voice recorder? Can it pick up sounds from the passenger cabin?
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How can the breath of a pilot be recorded?

On a plane, as a passanger, I can't hear my own breath. I can't hear my own breath even in a silent room. On a plane, there is a continous background noise. And the microphone recording the noises ...
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2answers
728 views

Are plane's black boxes essentially useless tool in the modern age and how to improve upon it? [duplicate]

I am just reading the latest news on the air plane crash that happened couple days ago and it dawned on me that one too many times have I read a story on the NY Times where after black box is obtained,...
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1answer
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Where inside a black box is the data storage located?

In a news article I saw this picture of a black box from a crashed A320. The article mentioned that finding the black box had lead to some disappointment due to the black box having been damaged: ...
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What is the form of information stored in black box?

Black boxes contain the information regarding to a flight. What is the form of those information? Any particular language log?
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How do airlines (or the government) retrieve information from the black box of an aircraft?

When black-boxes are found, how is the information retrieved from within the data storage? Is there a special kind of device used for this?
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Why are FDRs and CVRs still two separate physical devices?

Given the histories of flight data recorders and cockpit voice recorders, I somewhat understand their origins as two separate physical devices. Given their separate tracks of development, regulatory ...
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How can the CVR from a Cessna 560XL only contain old records and none from the fatal accident?

Is it possible that the CVR from a Cessna 560XL is just showing old records and nothing from the fatal accident when the plane crashed? I´m talking about the airplane crash in Brazil, where a ...
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2answers
519 views

Can airplanes transmit/relay flight data to ATC's periodically while in flight? [duplicate]

The flight data recorder is one important piece of information in the event of a crash. Can this information not be transmitted or relayed to the ATC's while the flight is air borne so that they don't ...
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1answer
189 views

Depth and range for FDR/CVR black box detection [duplicate]

What is the maximum depth range of a FDR underwater, at which it is able to be detected by receivers? I want to know the maximum range of ULB pinger locator if it's submerged.
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Why is the FDR and CVR put into water again after a water crash?

When a plane crashes in the water and the investigator team looks for the FDR and CVR, why do they put it in a container of water when they find it ?
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Where are the microphones for the black box located in the cockpit?

All modern commercial airliners have a CVR (Cockpit Voice Recorder) on-board to record what the pilots are saying during the duration for a flight. I feel that the location of the microphones is ...
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2k views

How much data do FDR and CVR generate on commercial jets?

I'm wondering about how much CVR and FDR data an A320 (for example) would produce and at what intervals. I believe that there are 4 or 5 voice channel and several sensor data things. I'm trying to ...
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Does the NTSB provide CVR audio recordings alongside transcripts in accident reports?

Reading the NTSB's accident report on US1549, there is a transcript of the CVR from page 149 onwards in the PDF (marked as page 130 on hardcopy). Small clips of the ATC/crew communications exist, but ...
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Why are FDR's called “black boxes” when they are actually orange?

Why do they call flight data recorders a "black box" if it's orange in color? Just curious about this since I've seen several images of black boxes but they all come in orange colors, and not black. ...
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Why don't black boxes have their own GPS?

In too many cases of unfortunate incidents, hunting for FDR (or CVR also) is a major challenge.1 There are many or all answers recorded on that device. Why a locator (GPS linked) cannot be included ...
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1answer
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Why don't they have two black boxes? [duplicate]

Why is it that black boxes don't float? From what I gather the answer is: So they will not float away from a water crash site. The ping can be heard underwater with sonar. Finding the ping, finds ...
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How close do you have to be to an underwater black box to detect it?

The news keeps talking about the black boxes on aircraft that end up in water, and one thing that keeps coming up is the underwater locator beacon that transmits a signal for 30 days if it gets wet. ...
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892 views

How is data transmitted to CVR and FDR?

A recent news item mentioned that "black boxes" are typically stored in the tail section of an aircraft to maximize their odds of surviving a catastrophic incident. If they're stored in the rear of ...
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288 views

Is it possible for the sensors which determine when an aircraft has landed in water to become damaged?

A plane has sensors that should transmit data back somewhere when it hits water correct? Is it possible that these can be turned off/damaged?
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861 views

What happens to the transponder, FDR and CVR in case of an explosion?

Will the above mentioned equipment still work and transmit data/location information if an explosion occurs inside the aircraft?
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Do aircraft manufacturers produce their own black boxes?

Do the manufacturers who build airplanes use their own "black boxes" in the planes, or are there companies whose sole purpose is to develop black boxes? For example, in 2010 in the Airblue Flight 202 ...