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

2 votes

Why do airline pilots have shoulder harnesses?

The main function of a shoulder harness or five-point restraint (as opposed to a simple lap belt) is to provide upper-body restraint and keep the occupant's head and upper torso from flailing about du …
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0 votes
0 answers
115 views

Why don’t most aircraft have emergency braking parachutes? [duplicate]

Braking parachutes were standard on first-generation jetliners, but have since fallen almost entirely out of use except on military aircraft; essentially the only civilian aircraft nowadays to still c …
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3 votes
1 answer
344 views

Why aren't any jet fuels heavier than Jet A/A-1/JP-8 in common use?

The commonly-used jet fuels fall into two main categories: Straight kerosenes (Jet A, Jet A-1, JP-8, JP-5, plus, historically, JP-1), which are used in most situations because their high flashpoints …
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2 votes

How can a crew be warned of "Clear Air Turbulence" during the flight?

Not on board the aircraft as of yet, no (unless, as @Gerry said, you count the radio that lets you hear about the person ahead of you running into CAT). There are ways of detecting CAT, however, whic …
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4 votes

Why ground a plane while fueling?

According to reddit, the amount of fuel transferred when refuelling a car is generally too small to generate a dangerous amount of static charge, and you actually do ground your car when you …
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7 votes

Why are you required to commit to a full stop landing if reverse thrust is selected?

Because if you do try to go around after the reversers deploy, you run the risk of them failing to retract - or, much worse, of just one of them failing to retract. As happened on 11 February 1978, w …
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1 vote
1 answer
626 views

Why aren't airliners spin-tested?

According to Wikipedia, only single-engine aircraft with an MTOW no greater than 12500 pounds are required to demonstrate the ability to recover from a spin, and not large or multi-engine aircraft. T …
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4 votes
2 answers
482 views

Why don’t aircraft have interlocks to prevent high-lift devices from being retracted when do...

Most aircraft have high-lift devices on the wings (such as flaps, slats, droops, whatevs) to allow them to take off and climb out at a reasonable speed instead of having to accelerate to near cruisin …
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1 vote
2 answers
755 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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3 votes
2 answers
298 views

Do any aircraft automatically test that the pitot-static system is functioning properly befo...

Given that a properly-functioning pitot-static system is absolutely essential for flight (a plane cannot be flown without valid airspeed data, or at least not for long), are there aircraft that automa …
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3 votes
1 answer
906 views

Why didn’t the 757 have manual-reversion capability?

the (widebody, and, thus, reversion-free) 767, and thereby possibly jeopardising the common type rating pilots can obtain for the two - but how can operational convenience possibly justify skimping on safety
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1 vote
0 answers
195 views

How big does an object in one of the ILS critical areas have to be to cause a problem?

ILS installations have a critical area extending some distance back from the glideslope antenna (primarily due to most glideslope transmitters’ needing to bounce one of their two beams off the ground …
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0 votes
1 answer
406 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 requir …
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6 votes
1 answer
567 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 st …
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-2 votes
1 answer
479 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 …
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