Questions tagged [accident-investigation]

Use only when final reports are released or for the process of investigating accidents. Questions inviting speculation or opinions are off-topic.

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1answer
1k views

How do witness marks on propeller blades provide data on estimated blade angles at the time of impact?

In the NTSB Powerplant Group Chairman Factual Report for the 2014 crash of the King Air B200 in Wichita Kansas (NTSB# CEN15FA034), I read: "Neither propeller was feathered before impact. Both ...
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Has a passenger's consumer electronic device ever actually caused a crash?

Most of us are familiar with the standard warnings and regulations against passengers using electronic devices (at all during takeoff and landing, and in some cases throughout the flight). This is ...
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2answers
301 views

Have attitude indicators ever had triple failure in a commercial aircraft?

I'm wondering about couple of well known crashes (mainly AF447 and AirAsia 8501) and thinking: is there any case where triple redundant attitude sensor failure has ever occurred? In those accidents it ...
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How can a pilot involved in serious accident remain unknown?

Somewhat similar to this question. A short part from Wikipedia article about Emirates Flight 521 (emphasis mine): The captain was an unnamed 34-year-old UAE national who had been with Emirates since ...
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3answers
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Why are manufacturers assumed to be responsible in case of a crash?

I attended at a training concerning airborne software and the coach remarked that despite at the normal courts, when an aircraft crashes and the authority investigates, a manufacturer is guilty for ...
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103 views

Are there any characteristics of a hypoxic flight? [closed]

Any patterns that investigators look for? For example, what happens when the engine flames out? is it guaranteed to enter a high speed dive? And would this affect certain parts of the aircraft, ...
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2answers
138 views

What is MCAS' purpose? [duplicate]

In a recent question, one of the answers states: MCAS has nothing whatsoever to do with stall recovery or stall behaviour. It was implemented strictly to make the MAX's pitch stick force response in ...
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Is there a reason that commercial jets do not have a “dead man’s switch”?

Following high-profile cases of disappearances such as MH370, as well as the lower-profile but no doubt common radar infringement and level / airspace busts that we don’t hear about often, is there a ...
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How far along was JFK Jr. in his instrument training?

I read up a little more about the infamous and tragic incident. JFK Jr. had over 300 hours logged, and about 36 in the Saratoga, half of which was solo. It's not like he was a newly minted VFR pilot ...
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What would happen if a hot air ballooon was punctured in mid-air?

I am writing a script for a film where a hot air balloon is punctured and it falls to the ground. There are two teenagers in the balloon when it is in the air. What I would like to know is how fast ...
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What is the maximal delay between the publication of an investigation report recomending a study and the beginning of this study?

This question is focused on EASA regulations, mainly because the question arise when reading an investigation report written by the BEA. Investigation reports results in lots of recommendations to ...
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270 views

What caused the Belgian aircraft mechanic who stole an F-16 to crash? [closed]

This is the story, from the late 80s: https://apnews.com/3b2ba1c5735b3817a3e7ae3562780e9b Why did he crash? Why would anyone crash in this scenario? I'd like to ideally hear from someone who is ...
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ETH 409: Was the most obvious sign of fatigue being a factor due to one of the pilots calling out “go around” when they were climbing after T/O? [closed]

One of the pilots yelled out “go around” x6. It looks like they were making a right turn when they should have been making a left turn. The controller informed them for the second time to turn left, ...
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374 views

What are some examples of pilot error with criminal negligence?

I’m having a hard time understanding why pilot error technically can’t be criminal negligence all the time? So I’m curious to find out some examples of this exact scenario, and how investigators ...
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Is there a typical time on site during an investigation of a major accident?

An answer to the question Why does it take months, sometimes years, for the BEA and NTSB to complete aviation accident investigations? said, Visiting the Site - First there will be a team that ...
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Has any accident been prevented by bending or breaking the rules?

I wonder if there is an incident that pilots saved the plane or minimized the damage by bending or breaking the rules like Sully? (As it's known Sullenberger started the APU at first which was the ...
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372 views

Has color vision deficiency ever contributed to any incidents in aviation history?

I would like to know if there are any official reports pointing Color Vision Deficiency (CVD) as a major contributing cause of an air accident/incident. Not only related to flying but also maintenance ...
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Does the NTSB and other investigative agencies charge airlines for investigations?

Does an airline have to pay the investigation team? For example the NTSB? And if Boeing or Airbus participate in the investigation, do they also charge the airlines?
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Incident & Accident Investigation [duplicate]

Does the airports have there own incident/accident investigation depts? or they are restricted to the NCAA/Safety dept only?
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Do airports have their own incident/accident investigation departments?

Do airports have their own incident/accident investigation departments? or they are restricted to the NCAA/Safety department only?
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1answer
162 views

How is an air accident's probable cause determined?

I constantly hear that air accidents are caused by a range of shortcomings. However, most accident reports declare a main "probable cause". You can see below a bar-chart with the causes of fatal ...
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1answer
299 views

Why did the Boeing Max operated by Lion Air disintegrate upon crashing in the sea from a low altitude?

The Lion Air Max crashed in the Java sea from a low altitude. What is the structural integrity strength of the fuselage? I am curious to know the structural strength and integrity of commercial ...
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Can the debris pattern from a crash site confirm explosion as the cause of a crash?

Is there any precedent or can the debris pattern positively confirm the cause of a crash due to: an internal explosion OR strike from a missile or other military projectile? If a particular flight ...
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241 views

How do insurers apportion responsibility when airliners collide on runways or taxiways?

Here's an ATC recording of Virgin and Egyptair aircraft clipping wings at JFK. Generally, what happens next with regard to sorting out responsibility after a low-speed collision that results in ...
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Is there any obvious warning when auto-pilot is disengaged or when the mode changes?

Under the investigation section of the First Air Flight 6560 incident, it describes the catalyst for the accident: The approach was entirely flown on autopilot, which was correctly set to capture ...
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What does Lion Air faking the repair of the AoA vane mean for the Florida repair shop that ceased operations?

This is a lengthy read, but worth it. I'll quote the main piece I am speaking of. At the Bali airport, a vane, known as an angle of attack sensor, was replaced. Crash investigators were presented ...
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What changes were made to the 777 as a result of British Airways 38?

Regarding the crash of British Airways Flight 38, a 777 inbound to Heathrow, the AAIB final report, section 2.8 states that frozen fuel deprived the engines of fuel pressure resulting in the crash. ...
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Would shutting down the engine have prevented the Atlantic Southeast Airlines Flight 2311 crash?

In the crash of Atlantic Southeast Airlines Flight 2311, a worn propeller quill caused the propeller blades to go flat, which created enough drag on that side of the airplane to make the aircraft ...
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1answer
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How long is maximum time to investigate an airplane crash?

Lion Air flight 610 was crashed on 29 October 2018. It was Boeing 373 Max 8. Almost one year ago. I have not heard any news from National Transportation Safety Committee (NTSC) when they will release ...
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342 views

Did the First Officer of Ethiopian Flight 302 trim in the wrong direction? [closed]

Looking at the accident report of Ethiopian Airlines Flight 302, it says the cut out switches were used. But the manual trim moved from 2.3-2.1? My reasoning for asking this is because the timeframe ...
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Structural rating of aircraft to withstand storm induced structural stresses

I was watching an accident report where an aircraft crashes when a storm destroys a wing spar. I'm curious is this only a danger for small aircraft or are there ...
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Why does the autopilot disengage even when it does not receive pilot input?

After having read the disturbing https://en.wikipedia.org/wiki/1999_South_Dakota_Learjet_crash I'm left with the question as to why the computer allows for the autopilot to be disengaged when there ...
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Why was Pan Am Flight 103 flying over Lockerbie?

Pan Am Flight 103 was a flight from Frankfurt to Detroit with stops in London and New York. Why after taking off in London did it fly all the way to Lockerbie instead of going directly to New York? ...
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Is this one of the engines from the 9/11 aircraft?

I ran across an interesting set of post-9/11 photos and I noticed this picture in particular: The closest item on the truck looks a bit like an airplane engine, but I can't tell for sure. Is it one ...
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1answer
158 views

What is an “aeronautically qualified witness”?

Many older NTSB AARs, in their history-of-flight-and/or-accident-sequence sections, make mention of observations by an “aeronautically qualified witness” or witnesses, without any further explanation ...
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How much data is stored in the flight data recorder per hour in a typical flight of an A380?

One drawback or impediment to the storage of flight recorder data on the cloud is the amount of data that'd be transmitted and at cost. How much data in GB or TB is stored in the flight data recorder ...
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Is there a Cockpit Video Recorder?

Often we hear about Cockpit Voice Recorders, but are there video recorders?
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1answer
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What does the preliminary report on the Ethiopian B737 MAX accident show? [closed]

In early April the Aircraft Accident Investigation Bureau of Ethiopia released a preliminary report on the crash of Ethiopian Airlines flight 302 that happened on March 10, 2019. There apparently is ...
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154 views

Is it normal ops to dispatch an airplane after a stick shaker was on throughout the previous flight (Lion Air 610)? [closed]

I've been studying Figures 5 and 7 of the Lion Air interim report and cannot understand why the airplane was dispatched on the "Loss-of-control" flight when the Left stick-shaker was on throughout the ...
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1answer
280 views

Smoking in the cockpit - how is this tracked?

A finding in the final report of US-Bangla Airlines Flight 211 crash is that the captain was smoking in the cockpit during the flight (page 46, section 3.1.2 e of the final report). My questions are: ...
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243 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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Is there less vertical space for an engine under the wing of a 737 Max than for an A320neo?

The source of this question is the understanding that the LEAP-1B couldn't fit under the wing of a 737 without changing its longitudinal position. But this wasn't the case with the design of the LEAP-...
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Why is Germany not able to read data from the Boeing 737 MAX black boxes?

It is my understanding that Germany stated it does not have the capacity to read the new software, declining Ethiopia's request: "The French announcement resolved uncertainty over the fate of the ...
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390 views

Why is Boeing being blamed for the recent 737 Max crashes? [closed]

Boeing has received more than 5,000 orders for the aircraft, it has delivered 350 so far and only 2 of them have crashed. That's not a very high crash rate. The FAA, until just a day ago, was very ...
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1answer
273 views

Could the autopilot have rectified the flight path without any crew input on the Aeroflot Flight 593?

In the case of the Aeroflot Flight 593 air crash, could the autopilot have rectified the flight path of the Airbus at any point if the crew had not attempted to correct the spin, even while partially ...
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How unusual is the 737 MAX 8's crash history?

The Boeing 737 MAX 8 is getting a lot of bad press at the moment, but people's instincts when it comes to probability are generally terrible, especially when it comes to risk assessment. Compared ...
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333 views

Why wasn't the Boeing 737 grounded in 1991 after a crash's cause remained unknown? [closed]

Why weren't 737-200s (and other variants): grounded immediately after UA 585 crashed, out of precaution and risk avoidance? The crash's cause was unknown then. remained grounded in 1992, after the ...
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Did factors specifically related to the concorde design influence the Air france flight 4590 crash?

This youtube video partially attributes the retirement of all concorde fleets to the airfrance flight 4590 crash: Were the factors in this accident due to the ...
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1answer
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Was the 1992 Gimli DHC-4 Caribou accident ever investigated?

On August 27, 1992, 3 people were killed when a de Havilland Canada DHC-4 Caribou crashed immediately after takeoff at Gimli Industrial Park Airport. Wikipedia describes the accident as follows: ...
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Which military aircraft does this seem to be? [F-16 vs MiG-21]

Can someone identify the aircraft based on the components, riveting style, or other technical details visible in these crash pictures? a) Based on publicly available details, the chief suspects are ...