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Questions tagged [safety]

Safety includes all aspects of protecting aircraft, passengers and crew from accidents, mistakes and other potentially dangerous situations.

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do commercial flights need to carry epipens? [migrated]

My friend has a severe nut allergy and brings multiple epipens aboard flights. This is apparently the safest thing to ensure the proper treatment of a potential alleric reaction, especially in the ...
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3answers
12k views

How difficult is it to simply disable/disengage the MCAS on Boeing 737 Max 8 & 9 Aircraft?

With regard to the Ethiopian crash of the 737 Max 8 aircraft, where according to preliminary reports, it appears to be related to the MCAS which is a safety system that pushes the nose down to correct ...
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2answers
723 views

Why is not every airplane equipped with 3 angle-of-attack sensors?

For critical systems, redundancy is built into the system. It is common knowledge among designers/architects to have three different inputs so in case one is faulty, input from the remaining two can ...
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2answers
1k views

Do some aircraft now have “full aircraft” parachutes?

I was intrigued to see this mentioned in passing, http://robbreport.com/aviation/cirrus-aircrafts-vision-sf50-personal-jet-completes-flight-testing-video Is it true that some new products now have ...
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3answers
735 views

Is the Boeing 737 MAX 8 MCAS exceptional in operating when autopilot is off?

To the uneducated reader it seems strange the Boeing 737 MAX 8 MCAS system only operates when autopilot is off. I understand the reasoning behind why it was implemented to operate when autopilot is ...
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0answers
111 views

Has any jurisdiction mandated passenger training?

A chunk of pre-departure time for each flight is dedicated to a safety briefing for passengers that few passengers seem to pay attention to. In the aftermath of accidents, it has been revealed at ...
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0answers
86 views

Can 7 AKE containers adjacent to each other be securely locked in a 777-300ER's aft cargo bin?

Is it possible to securely lock 7 AKE (LD3) containers adjacent to each other in a Boeing 777-300ER's aft cargo bin from position 31 to 41 (41 included)? According to my experience it's impossible to ...
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9answers
779 views

How many serious airline accidents have been caused by design faults alone?

That is, in the chain of events that led to death or injuries in an airline accident, how often has a design fault been solely responsible? By a design fault I mean a problem such that even if the ...
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1answer
158 views

Why not separate out the two definitions of V-1 into two separate Vspeeds?

V1, officially the takeoff decision speed, has, somewhat infamously, two separate definitions: It is defined as the minimum speed at which, if one engine fails, the pilots can press to liftoff and ...
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0answers
167 views

Who decided that the Boeing 737 MAX planes that were airborne when the grounding was issued cannot enter and land in EU air space?

On March 12th, 2019, EASA grounded the Boeing 737 MAX series by publishing their Emergency Airworthiness Directive 2019-0051-E (AD): Effective Date: 12 March 2019, 19:00 UTC  [...] ...
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2answers
2k views

How can air travel be so safe if the aircraft skin is only 1-2 mm thick?

Aircraft skin is not very thick at all, yet air travel is the safest form of travel. All aviation professionals know why, but most occupants of an airliner are not professionals. How can it be ...
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4answers
365 views

Are pilot YouTubers breaking any rules?

Recently, I've been watching a few YouTubers (mostly FOs) who make great videos like this: Then I realized... They must spend a lot of time setting up cameras, ...
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2answers
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What is the longest period of time an aircraft type has been grounded due to safety concerns?

Obviously inspired by the current 737 Max situation, what is the longest period of time that any individual type of airliner has been grounded for safety concerns (excluding those that never returned ...
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3answers
9k views

How dissimilar are redundant flight control computers?

On Airbus aircraft there are computers to secure the flight envelope, or to move the control surfaces. FADECs totally control the engines. Computers take decisions in place of the pilots, or even ...
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1answer
824 views

What is the difference between redundancy and fault tolerance?

What is the difference between redundancy and fault tolerance in the context of aviation ?
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Are pilots with impaired vestibular function less prone to crashes in IMC than those with fully-functional vestibules?

As you all will know already, the vestibular sensors of the inner ear are the human body’s primary attitude and acceleration indicators on the ground; however, as humans did not evolve as an aerial ...
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1answer
37 views

What is the most critical data to measure for a predictive maintenance model for a drone?

I'm looking at making a predictive maintenance model for a drone (quadcopter mainly but can include others) I'm wondering what is the most common causes of failure due to "overflying". (not including ...
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2answers
166 views

Is it possible to 'derate' a plane as a safety measure?

Assuming a type of plane has a technical issue that must be fixed related to its flight behavior, could the plane be derated to add safety margin (instead of banning it). What I have in mind is ...
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1answer
156 views

Why don't all pilots receive at least basic instrument training?

Given the frequency with which non-instrument-rated pilots get themselves killed attempting to continue VFR flights into instrument conditions, why don't all pilots receive at least basic instrument ...
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1answer
154 views

Why does the DHC-6 have only one set of elevator cables?

Air Moorea Flight 1121 crashed because its up-elevator cable broke, allowing the elevator to blow to its faired position and thus be unavailable to counteract the pitch-down moment caused by the flaps ...
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0answers
81 views

Could a kilometer of sand as wide as the runway,1 meter deep stop an Airbus A380 if it overshot the runway [duplicate]

An aircraft overshooting the runway could prove to be fatal. Assuming an Airbus A380 is fully loaded at near take off speed and pilots decide its would be best to abort take off, if they slammed the ...
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1answer
238 views

What happens to an airborne plane when its type is grounded by an authority?

Many countries have (temporarily I think) banned 737 Max 8s from taking off or landing. What happened to the ones in the air? Do they get special permissions or are they forced to divert to a ...
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1answer
185 views

Is it common for automated control systems to use non-redundant sensors?

While reading an article about the Lion Air Crash with a Boing 737 Max 8, I was very surprised by the following paragraph: In designing the 737 Max, Boeing decided to feed M.C.A.S. with data from ...
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3answers
2k views

Which situations would cause a company to ground or recall a aircraft series?

Which agencies or companies might decide to ground an aircraft series, and in which situations can this occurr?
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4answers
33k views

Why does the Boeing 737 have 5 x the passenger fatalities of the Airbus 320?

I thought I'd compare the accident rates of these two similar, competing, very successful aircraft. ...
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2answers
159 views

How do aircraft stall warning systems handle (or not) asymmetric-stall situations?

Most, if not all, new airplanes are required to have stall warning systems to (as the name should make clear) provide the pilots with a warning when the airplane is about to stall. Most stall warning ...
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0answers
41 views

Why are airline seat belts lap-only? [duplicate]

On the flight that I was on today, one of the passengers near me asked this question. Why don’t airplanes use lap- and shoulder belts like cars do?
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6answers
9k views

How do I determine odd or even when working with altitudes?

I am always confused about how to calculate safety altitude, especially when it comes to even heights and odd heights, e.g. is 7500ft even or odd?
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3answers
614 views

To what extent have political (race, gender, social class) attitudes been implicated as human factors in the cockpit?

This question is related to: How does cultural difference impinge upon human factors in aviation industry safety? How have deep-seated cultural human factors (particularly in east Asia) in the ...
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8answers
13k views

Where is the safest seat in the plane?

If I'm going on holiday with my family on an airliner such as one of the ones listed on this page, then where is the safest place to sit? The answers to this question seem to imply that the seats at ...
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0answers
111 views

Why are IFE screens temporarily disabled during takeoff, landing or turbulence? [duplicate]

Why are the In-Flight Entertainment (IFE) screens temporarily disabled during takeoff, landing or turbulence? Is it because it connects to certain functions which need to be disabled during those ...
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0answers
58 views

Cessna 421b pressurization cycles

How many pressurization cycles can be expected in a Cessna 421b before it fails? Is pressurization failure in a Cessna 421b likely to be catastrophic?
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1answer
820 views

How prevalent are anti-explosion bladders in fuel tanks?

Some aircraft fuel tanks are fitted or retro-fitted with internal bladders, to prevent fuel evaporating inside the tank. I've heard of this being a requirement for at least one type, perhaps because ...
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53 views

Source and Impacts of cracks on window pane? [duplicate]

Today, I spotted cracks on the outer window panes, of my aircraft, VT-GWH, a 11 year old A320. The cracks were present on every window pane that I could see. On simple observation, I found that the ...
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3answers
12k views

Why are so many ATR involved in accidents in the past years`?

I asked myself a question why are so many ATR involved in accidents in the past years? ATR-72, 16 October 2013, Lao Airlines Flight 301 ATR-42, 19 October 2013, P2-PXY, Air Niugini ATR-72, 23 July ...
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4answers
2k views

Was the miracle on the Hudson saved exclusively by the APU?

In the film Sully, (staring Tom Hanks) the APU is switched on straight after both engines rollback, why was this step necessary; Airbus said this was the "15th thing" to do on the checklist. How or ...
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3answers
7k views

If the “Fuel Shutoff Valve” is ON, wouldn't fuel be cut off?

Ok, so this may be more of an english lanugage question, and I can confirm from context that when the fuel shutoff valve is ON fuel does indeed flow to the engine, but wouldn't that just make more ...
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2answers
313 views

What are regulations for pyrotechnics on planes?

Being in love with both fireworks and flying this is a question that I wondered about for quite some time. Especially when watching videos like this (which is from 2009 showing a stunt plane flying ...
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2answers
333 views

What does “leave clear on its left” mean in UK regulations relating to collision avoidance on non-runway landings?

This doesn't seem to be plain English, could someone explain this with a simple example for me please? I'm not sure what 'Leave clear on it's left' means, and it's not clear whether the subject of the ...
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5answers
930 views

How can cargo be jettisoned from a C-124 in flight?

I was reading about a C-124 that was carrying three nuclear weapons over the Atlantic, and developed engine trouble. The article said that two of the weapons were jettisoned into the ocean for safety ...
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1answer
314 views

What is the wattage for strobes and anti-collision lights flashing lights on an aircraft?

Flashing anti-collision lights, also know as strobes on an aircraft can be seen on the aircraft When flying at 36,000 ft during the day with clear skies. What is their wattage (e.g 1000 watts) since ...
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3answers
3k views

How are Virgin Galactic's SpaceShipTwo's windows so large?

From Virgin Galactic on SpaceShipTwo: Windows in the passenger compartment will be 13 inches (33 centimeters) wide by 17 inches (43 centimeters) tall. IMO that's enormous for an airplane, ...
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71 views

Marshall signals history

When airport marhall signals have been used for the first time? Wich is the history about these signals? Thank you
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1answer
1k views

How do pilots clear an aircraft to fly through a hurricane?

This video shows a pilot (Tim Gallagher/NOAA) flying what looks like a small jet into the eye of hurricane Matthew by Miami. It's clear that it is quite an interesting ride. The (small) caption states ...
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1answer
254 views

Which items are allowed on passenger flights but not on cargo ones?

I've only ever sent items by air in suitcases accompanying me in passenger flights. But - I'm about to send some items on a cargo-only flight in a few days. I've been told: Make sure that there are ...
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3answers
226 views

What warning lights can one safely fly with? [closed]

Like many people, I often either ignore or reset warning lights in my car and continue to drive without issue for months or years (usually due to dodgy sensors giving a false-positive). What warning ...
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2answers
5k views

Are the instrument panels in the cockpit spill / waterproof?

There are multiple switches and buttons in the cockpit, with different shapes and layouts. Are they spill proof? What if the pilot spills water or coffee on them, will they still function?
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2answers
117 views

What prevents the use of an EMAS along the sides of a runway?

The NTSB report about the crash of American Airlines Flight 1420 discusses whether an EMAS would have mitigated the severity of the accident, but concludes, based on testimony from a representative of ...
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2answers
7k views

Is it allowed to listen to music while piloting a plane?

When I'm driving my car, I almost always put some music on. It's really relaxing for me. I know that piloting a plane is nothing like driving a car, but it would be great, at least for me, to listen ...
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2answers
4k views

Is there an audible warning on commercial aircraft if you try to land gear up?

In one of the comments on this question (under the accepted answer), someone remarks that Aircraft can legally fly without a system to alert the crew when they are landing with gear up, etc. Are ...