under what conditions a pilot set the standard pressure of 76 mm of mercury in the aircraft?

Answer 1

Wow! No pilot answer above!
I assume you mean "760mm" of mercury and not 76.
Speaking in millibars (the more accepted standard), you set your altimeter this way:
To the QNH: value of setting at sea level. This is the actual pressure at sea level.
To the QFE: value of setting at the airfield altitude (so the altimeter shows "0" when you are on the airfield ground.
These two data are given by the ATC (Air Traffic Controller).
or you set your altimeter to FLIGHT LEVEL, i.e. with 1013.25mB pressure or 760mm mercury, when you are above 2000 feet (or the free zone level in your area).
So, you start with QFE on take-off.
Set to QNH when you have left the circuit and
Set to 1013.25 "FLIGHT LEVEL" when you are on your way and in contact with the FIR or approach of the airfield.
You then announce your altitude (ie 5000 feet) as: "Flight Level 50" (it is expressed in 100's feet).
An aircraft flying at 35,000 feet says it is at FL350.

Answer 2

When on the ground and the barometric pressure is measured to be 76 mm. But, since the 'standard' atmosphere is 760 mm you'd have to be at a *very* high-altitude field.

I seem to remember that Denver runs around 620 mm and it's at a bit over a mile above sea level.


Doug

Answer 3

Well most setting that a pilot makes are done on the ground before he or she take off.
This is done so they know just how high they really are off the ground at any given point in there flight. Most airports have the elevation marked on signs posted at the terminal. they take this posting then set to the real air pressure at that time and use for there instruments.

Answer 4

First of all, your grammar stinks, and second of all, if a pilot set the pressure to 76 mm, you would probably die! Learn to proofread!

Answer 5

when aircraft at the airport