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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55
votes
9answers
10k views

Why don’t airplanes use turn signals?

Why don’t airplanes use turn signals like cars do? Would this improve safety for ground operations at uncontrolled airports? Could a similar concept be used to indicate in air maneuvers? For example: ...
10
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1answer
289 views

How do airports detect drones?

Recently, there's been a lot of coverage in the news of drones disturbing operations at airports. Do airports have a method to detect drones? If yes, how does it work? If it's still an emerging ...
17
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5answers
6k views

Why aren't “fuel polishing” systems removing water & ice from fuel in aircraft, like in cruising yachts?

Should you sump fuel tanks when the fuel system is below freezing? the question should one sump fuel-tanks before flying, if in freezing-conditions? but this implies another question that boggles me:...
3
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1answer
175 views

Modern airliners are designed to be able to withstand the worst (vertical) turbulence. But what about the rarer lateral (horizontal) turbulence?

'Extreme' turbulence is a derived vertical gust velocity of >3,000 fpm (50 fps) that causes a vertical G-load of >3. The limit turbulence intensity for a modern day airliner is 90 fps. (there is ...
0
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1answer
76 views

Is flap-asymmetry protection on airliners still active even on the ground?

On aircraft with flaps, a general certification requirement is that it must not be possible for the aircraft to suffer a loss of lateral control secondary to an asymmetric-flap condition. This ...
13
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3answers
4k 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 ...
21
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2answers
2k views

Are controllers aware of TCAS RA taking place?

When the TCAS issues a Resolution Advisory (RA) which contradicts an ATC instruction, the RA takes priority. Are controllers aware (notified on their screen) that a RA has been issued between two ...
0
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3answers
171 views

Why do we take off with maximum power settings?

In most GA prop airplanes, take-off is executed with full throttle and high rpm. The usual reasoning is that this way, we leave the first few hundred feet, where failures are most severe, behind as ...
1
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0answers
73 views

What is the relation between cargo smoke and EDTO?

I have heard a lot of people discussing about cargo smoke and Extended Diversion Time Operations (EDTO) together. Just want to know how these two affect each other.
16
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3answers
3k views

What percentage of airplanes are involved in a crash in their lifetime?

The chances of a commercial flight crash are about 1 in 1,200,000 - pretty low. If each plane makes about 40,000 flights in it's lifetime, about 1 in 30 airplanes will be involved in a crash before it ...
0
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2answers
290 views

Why are these 3 planes so close?

I spotted these three planes flying east then turning south. They were over the Hopi reservation and heading toward Winslow, AZ at 10:42 AM local time (MST), today February 5 2021. They were at 15k ...
7
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3answers
2k views

Are carbonated drinks considered dangerous goods for air freight?

I understand carbonated drinks in allowed in cabin, but, is it allowed in air cargo transportation, when you ship in bulk?
-3
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1answer
140 views

Why is scud-running necessarily dangerous? [duplicate]

(Disclaimer: Please do not take the below as an endorsement of scud-running.) Scud-running is when a pilot flying in poor weather operates their aircraft at a lower-than-normal height above terrain in ...
1
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2answers
163 views

What is the maximum momentary G force that a modern airliner's wing can take before it snaps in extreme turbulence?

Taken from an aviation safety pdf.. Intensity - LIGHT - Vertical acceleration (g) 0.20-0.49 - Derived Gust (fpm) 300 -1,199 Intensity - MODERATE - Vertical acceleration (g) 0.50-0.99 - Derived Gust (...
-5
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1answer
147 views

Why didn't the airlines try to start copying SpaceX by putting camera on the outer body of the airplane? [closed]

This week my country Indonesia just had an Airplane crash accident Sriwijaya Air SJ182. I'm getting sick with people speculating why or how the plane crashed. Well, we can wait for the black box ...
8
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1answer
924 views

How to reasonably determine minimum safe altitudes over city? (fixed wing)

How does one make a determination about what a minimum safe altitude is when over a city. Let's reference FAR 91.119, the two sections that talk about this: (a) Anywhere. An altitude allowing, if a ...
20
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4answers
3k views

Did DB Cooper's aircraft land safely with the aft stairs open?

I've never seen a 727's aft stairs open, but presumably, based on an Wikipedia image and common sense, they do reach the ground when the aircraft is on the ground. Furthermore, (as I understand it), ...
6
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6answers
2k views

What measures prevent a military aircraft's weapons from being fired on the ground?

Recently the 20mm cannon of an F-16 was accidentally fired on the ground by maintenance personnel at Florennes Air Base in Belgium, resulting the the destruction of another F-16 and damage to a third. ...
12
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2answers
2k views

What can happen if a bird strikes the engine during landing?

I am not sure what can happen if a bird strikes an engine during landing. To narrow it down: commercial airliner (B787/A380 etc.) hitting a large bird so engine out is likely.
6
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3answers
2k views

People say that modern airliners are more resilient to turbulence, but I see that a 707 and a 787 still have the same G-rating. Why is this?

The 707 was introduced in the late 50's, the 787 in 2009. Back when Air France 447 had recently gone missing, many were speculating that the aircraft had broken up in the turbulence associated with ...
-5
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2answers
173 views

How dangerous are tailwind gusts for STOL aircraft?

If I fly close to stall speed with a STOL plane and gust of 20kts tailwind comes at me,it will cause sudden reduction in lift ,becuase plane has inertia so it can not accelerate instantly. How ...
9
votes
8answers
7k views

Can a handgun shot take down a commercial airliner?

Most airplanes, when taking off or landing, are in range of small arms fire, i.e. your every day handgun. Is it possible to take down a commercial airliner by shooting at it with a handgun? Would one ...
49
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3answers
28k views

What is the technique or procedure to disable/disengage the MCAS on Boeing 737 Max 8 & 9 Aircraft?

What is the technique or procedure to disable the MCAS and manually fly the Boeing 737 MAX 8/9 Aircraft? To clarify my question, what I'm asking is can the pilot disengage the MCAS and if so, how do ...
8
votes
5answers
4k views

How much do you have to respect checklist order?

In a fighter aircraft, if the checklist says turn on the radar then turn on the Heads Down Display, and the pilot turns on the HDD first would he be reprimanded for that if it makes no difference? Is ...
5
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1answer
148 views

How can I tell if a rental aircraft has been maintained in good condition?

When I rent a Cessna (typically old) from the local airport, how concerned should I be that the plane may have been abused at some points over many years (over-load forces, hard landings, over-rev'd ...
5
votes
1answer
364 views

Why does an A300/310 in LAND or GO-AROUND mode have to be at least 400 feet AGL for manual control column movement to disengage the autopilot?

Each of the A300/310’s two autopilots has two modes of operation: In CWS (Control-Wheel Steering) mode, the autopilot(s) attempt to hold the attitude that the aircraft had at the moment of autopilot ...
-2
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4answers
217 views

Why can't we use bleed air instead of oxygen cylinders? [closed]

When cabin is depressurized due to some or the other reason then we usually have oxygen generators in airplane and they last for 12 minutes. It is very shot in usual terms but it is enough to descend ...
11
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6answers
1k views

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 ...
23
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4answers
7k views

Is it a flight violation to mishear ATC instructions for exiting the runway?

I was on landing rollout and misheard a tower "turn off at xxx switch ground" call. We read back the incorrect taxi way and turned off there and switched to the ground frequency. After our incorrect ...
2
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2answers
233 views

Reason why heavy aircraft are allowed to land but not to start

I stumbled upon this article (German) It says that a few of Lufthansas 747 are grounded at Twente airport. They were parked there because of COVID-19 at an aircraft recycling company. Now the airport ...
8
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4answers
3k views

Was this Gulfstream way below the glideslope?

I saw this YouTube video about a Gulfstream jet that came into landing on Princess Juliana International airport and the landing does not seem to be by the book at all. It seems like the landing gear ...
0
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0answers
33 views

What are the safety events definitons for Flight Operations Quality Assurance (FOQA)?

I am searching the definition and parameters of safety events which are used in Flight Operations Quality Assurance (FOQA). I tried searching by myself but I can't find anything valuable. Are this ...
18
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2answers
5k views

What improvements did Airbus make as a result of the Air France 447 accident?

As far as I can tell, the following factors all contributed to this crash: Pitot tubes susceptible to ice crystal blockage Crew not aware that they can stall the airplane due to alternate law No ...
0
votes
1answer
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, ...
4
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0answers
73 views

Is there a standard for required repainting of worn runway markings? In USA

Is there an FAA regulation or advisory circular covering the allowable wear, fading, or weathering of runway markings? I can find many FAA standards for the paint of fresh new runway markings, but I ...
2
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1answer
149 views

I have an idea about how to resolve a conflict between the pilots and an automated flight control system. Does it make sense? [closed]

I am thinking about the 737-MAX crashes. There is a similar question at Is it common for automated control systems to use non-redundant sensors? There was an article in yesterday's Seattle Times In ...
5
votes
1answer
188 views

Is it normal that an ELT activates during a strong up draft in flight?

I was flying a PA 28 181 Archer on a nice clear day at cruise speed level flight 3000ft. Suddenly, from nowhere it was hit by an up draft that lasted I would say less than a second. I got pain in my ...
0
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2answers
124 views

What is the best time to run runway friction tests? [closed]

When is the best time to run runway friction tests? And what is the optimum temperature to run them?
31
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3answers
4k views

Is it safe to roll an airplane that isn't approved for it?

I have heard of pilots rolling airplanes that aren't approved for it (Cessna 172, Learjets, etc.), and other than the obvious legal issues, are there any mechanical or safety reasons to avoid it? ...
2
votes
3answers
323 views

Do pilots of commercial aircraft have ready access to a map or data showing nearest airports in case of a need to make an emergency landing?

As a passenger I often wonder that if a pilot had to make an emergency landing, do they have access to live information to direct them to the nearest airport or is this something that they have to ...
10
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4answers
3k views

Isn't it dangerous for a soldier to sit on the outside of a flying helicopter?

AH-64 during an extraction exercise at Camp Bondsteel, Kosovo in 2007 with a soldier on the avionics bay. I lit upon this image on Wikipedia. I see that the soldier is harnessed fastened to the ...
4
votes
1answer
386 views

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 ...
15
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6answers
9k views

What is the commercial passenger aircraft top speed record?

Aircraft manufacturers claim that commercial passenger aircrafts cruise at the speed of 400-500 knots. But, is the top speed of a commercial passenger aircraft recorded (while in air)? If so, what is ...
12
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3answers
3k views

What is a 'Wing Loop Fault' on an A320 series Aircraft?

I was recently involved in a flight that had issues before take off. The plane was an Airbus 321. It was explained to me as being a "wing loop fault". The problem was that the ECAM messages were ...
0
votes
2answers
112 views

What is the name of Control equipment? [closed]

I wanted to know the name of equipment that controls the control surfaces of an aircraft by taking commands from the pilot through it's hotas stick. The aircraft could be a combat 50's or 60's a/c, so ...
23
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3answers
9k views

How is it safe for helicopters and Ospreys to refuel in mid-air?

How do military helicopters like the Blackhawk and CH-53, as well as the V-22 Osprey, perform mid-air refueling without their rotor blades (periodically and accidentally) contacting the drogue or fuel ...
5
votes
1answer
194 views

What were the historical safety statistics of airplanes?

There's lots of debates in the Space world about the safety margins of modern rockets (specifically the fact that the ITS isn't planned to have an abort mode as (in the words of many SpaceX supporters)...
11
votes
3answers
882 views

Has there ever been an uncommanded lowering of landing gear?

Has there ever been an uncommanded lowering of the landing gear on a large commercial jet? I could not find any instance of it in a preliminary google search. Could a simple short-circuit cause such a ...
14
votes
1answer
5k views

What if you refuse to fasten your seatbelt?

As a passenger, what happens / can happen if you refuse to fasten your seatbelt when you are told to, either during take off/landing or (bad) turbulences? I've recently read a Facebook post that ...
-5
votes
1answer
102 views

How will LiFi application in an aircraft change the security of an air travel? [closed]

In a near future, LiFi technology will replace WiFi in a commercial aircraft. LiFi will make nonstop internet service possible. This will generate some new issues in air travel security. Especially ...

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