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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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3
votes
1answer
199 views

Why is it appropriate to announce ‘stable’ on final approach?

I have recently discovered that a budget airlines flight deck in the UK (Airbus 320) announce ‘Stable’ on the final approach. Both the Captain and F.O, just after 500 ft is called out by the computer. ...
13
votes
3answers
3k views

Can I get a photo with the pilots?

Could I, as a passenger, get a picture with the pilots in the cockpit before takeoff/after landing? I'm asking specifically about any rules that would deny a passenger into the cockpit. I know this is ...
0
votes
0answers
48 views

How are the weights of sumo wrestlers shown on the load&trimsheet form? [duplicate]

Under normal circumstances most airlines use standard weights to calculate passenger weights. Sometimes, passenger groups with different weight than the normal passenger profile can also travel. How ...
0
votes
1answer
102 views

How is the load & trimsheet form sent to ACARS?

After the last passengers and baggage are loaded onto the aircraft, the pilot in command is given a form called load & trimsheet which shows the passenger/baggage distributions, total weights and ...
1
vote
2answers
246 views

How are insects and arachnids kept out of commercial passenger airliners?

If a commercial passenger airliner were to land in a place infested with insects or arachnids, wouldn't it be dangerous to have those animals enter the aircraft? For example, suppose if mosquitoes, ...
58
votes
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?
40
votes
5answers
7k views

Is the seat-belt sign activation when a pilot goes to the lavatory standard procedure?

Yesterday, I took an inter-European commercial flight with a popular budget airline. Before take-off, the captain announced that the First Officer would be taking the entire flight today. During the ...
0
votes
2answers
653 views

How was this airline (statistically) never had a fatal incident? [closed]

Ryanair make around 725,044 flights per year. This They have been operating for 35 years, so have accrued around 25,376,540 flights. They have also never had any fatal incidents or even major ...
3
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0answers
142 views

How should ground crews act to safely extinguish an airliner's brake unit fire?

When the brake unit was overheated and had just begun to catch fire due to excessive braking because of long taxi distance upon arrival, the ground personnel (not firefighters) made the first ...
5
votes
1answer
1k views

How common and dangerous are fume events?

I’ve been hearing about fume events where engine oil containing tricresyl phosphate as an additive can leak onto the HVAC packs and enter cabin air. These organophosphate are incredibly toxic and are ...
2
votes
0answers
100 views

Can a protective mesh protect engines from bird strikes? [duplicate]

Can a protective mesh be installed on the front of the engines to stop birds from entering the engine and causing damage?
14
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1answer
531 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  [...] ...
6
votes
4answers
526 views

Why do aircraft stall warning systems use angle-of-attack vanes rather than detecting airflow separation directly?

Stall warning and protection systems on essentially all aircraft work by using several hinged vanes on the side of the fuselage (usually at least three, and preferably more), which align themselves ...
2
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5answers
1k views

Would mechanical indicators have helped in the Air France 447 incident?

NB I am not an aviation professional. I saw a documentary about the terrible Air France 447 disaster the other day. I was struck, as were the experts in it, including David Learmount, who's known as ...
15
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3answers
1k views

Could a golf ball damage an airliner?

Question Would a golf ball ingested into an engine, or impacting a windshield cause meaningful damage to a commercial airplane? The scenario below outlines that this is possible, but the principle ...
7
votes
2answers
3k views

Is TCAS II required in the US?

I would like to know if, in addition to any MEL requirements, there is any regulation or requirement about having an operational TCAS II while operating in US airspace?
-3
votes
1answer
193 views

Is there a correlation between airport capacity and accident rates?

This question about the new Heathrow runway increasing flights per day by 700 mentions that this airport (and many others around the world) runs at over 98% capacity. This got me thinking, is there a ...
-9
votes
1answer
183 views

What can I do if my aircraft type changes last minute? [closed]

I have a flight scheduled for June with a popular, European commercial budget-operator on a 737. I'm sure everyone knows about the groundings of the MAX. However, I'm concerned that the MAX may be ...
16
votes
4answers
25k views

Are Boeing 737-800s grounded? [duplicate]

I’m flying on a WestJet Boeing 737-800 from Honolulu to Vancouver and then on to Toronto in July, returning on the same type of aircraft in August. Are these aircraft still grounded and are they ...
22
votes
4answers
5k views

Don’t seats that recline flat defeat the purpose of having seatbelts?

Virtually all first-class airline seats, and many to most business-class seats, recline all the way down, either as lie-flat seats (where the seat reclines to a 180º seatback-seatpan angle, but the ...
4
votes
1answer
237 views

Why is a small amount of smooth ice over the top of the wing more dangerous than an accumulation on the leading edge?

According to a Gleim study guide, "Generally speaking, smooth ice on top of the wing is more dangerous than heavy accumulated icing on the leading edge." Is this true? If this is true, why?
1
vote
2answers
346 views

Why was the Electra uniquely vulnerable to whirl-mode flutter?

The Lockheed L-188 Electra, notoriously, suffered from early problems with whirl-mode flutter, which caused two Electras to break apart in flight in 1959 and 1960, forcing an expensive redesign of the ...
8
votes
1answer
1k views

What is a “Lifeline Extension Belt”?

I was recently flying on an United Airlines A320 and noticed a narrow section between the overhead storage bins with a placard labeled "Lifeline Extension Belt" on it. It was over the wing exit row. ...
6
votes
2answers
489 views

Does the person directing the plane to parking not risk getting ingested by a jet engine?

According to answers in this post, a jet engine can suck a human into its engines, even on idle power. Aircraft use their engines post landing taxi and into their parking space, and I notice people ...
4
votes
2answers
6k views

How safe is the Beechcraft 1900?

While reading the tragic Accidents and incidents section of this Wikipedia page, I began to wonder how the Beechcraft 1900 ranks for safety. The page describes 22 known severe accidents and incidents ...
3
votes
0answers
59 views

Is it possible to selectively deactivate alarms? [duplicate]

My question is restricted to Airbus an Boeing's best sellers, namely the A320 and the B737. If relevant, answer can be extended to other types. In those aircraft, there are multiple possible alarms (...
4
votes
1answer
212 views

Do aircraft engineers take into consideration engine placement to avoid ground strikes in a cross-wind landing?

On a multi-engine airplane with wing-mounted engines, do aircraft designers have a standard way of ensuring that the banked landings associated with cross-wind's do not cause a prop or engine-housing ...
4
votes
1answer
322 views

What safety issues led the FAA to ban Constellation flights into/out of the U.S.?

Although the Lockheed Constellation (like the other late, large piston airliners) was superseded in the 1960s and 1970s by newer jets (plus turboprops for shorter/lighter routes), it hung on into the ...
15
votes
2answers
2k 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 ...
54
votes
3answers
19k views

What does it mean for a door to be armed?

What does "arming a door" mean? Is the orange tape that's applied over a window related, perhaps as an indicator to people outside that the door is armed?
35
votes
3answers
7k views

How long to clear the 'suck zone' of a turbofan after start is initiated?

I recently found this (IMO funny) picture. All funny and all. But let's make this a real situation. Let's suppose I see my crush and his BF doing this, and I come with this 'genius' idea (alright, it'...
13
votes
4answers
998 views

How should the crew callout 1,000 ft. prior to assigned altitude?

When climbing or descending in a multi-crew cockpit, most SOP's require a verbal callout at 1,000 ft. prior to the assigned altitude. I typically hear different callouts by different people: "One ...
0
votes
0answers
39 views

Does anyone know of any Boeing 737 Max-8 MCAS usage statistics? [duplicate]

How often has the 737 MAX-8 MCAS stall-averting software been successfully activated? Is this a rarely used safety item? Or is it in play in many, even a majority, of take-offs?
29
votes
3answers
7k views

Why are on-board computers allowed to change controls without notifying the pilots?

Recently we've had the 737-MAX debacle, where it increasingly appears that the MAX on-board MCAS system repeatedly would issue nose-down events, leading to the Lion Air crash, and possibly another ...
4
votes
3answers
2k 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 ...
5
votes
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 ...
4
votes
0answers
140 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 ...
2
votes
0answers
156 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 ...
5
votes
9answers
872 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 ...
5
votes
1answer
227 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 ...
6
votes
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 ...
8
votes
4answers
514 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, ...
6
votes
1answer
2k views

What is the difference between redundancy and fault tolerance?

What is the difference between redundancy and fault tolerance in the context of aviation ?
3
votes
2answers
185 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 ...
2
votes
1answer
198 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 ...
0
votes
1answer
183 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 ...
0
votes
0answers
85 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 ...
3
votes
1answer
297 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 ...
14
votes
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?
1
vote
2answers
335 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 ...