Alimetry

Question 1

The ICAO formulae states what?

Answer 1

1 hpa = 30ft

The pressure increases the lower the aircraft

Wind off pressure, wind off height

Wind on pressure, wind on height

Question 2

What is aerodrome QNH used for?

Answer 2

Calculating the Transition Level in the vicinity of an Airfield

Calculating Minimum Safe Flight Levels (MSFLs)

Flights in the vicinity of some civil aerodromes, although QFE is normally used for landing.

As a landing datum for some foreign and civil aircraft

On request, it can be passed to military pilots for internal use within the aircraft

Question 3

What is force QNH?

Answer 3

Force QNH is the lowest QNH forecast for an Operation/Excercise area for a defined period.

It is calculated by a suitably qualified Meto/Forecaster and promulgated to all participating units.

Question 4

What is QFE?

Answer 4

Corrected barometric pressure for a specified datum

Question 5

How is the safety altitude calculated?

Answer 5

Highest point around (round up to nearest 100 + 1000ft)