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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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
-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 …