Altimetry

Question 1

What is Elevation?

Answer 1

Distance between object and sea level

Question 2

What is the QFE and how is it useful?

Answer 2

QFE = HEIGHT

QFE (Query Field Elevation) is the amount of atmospheric pressure setting at aerodrome elevation. It can be used to measure the height of an aircraft

Height = distance from specified datum

Question 3

What is QNH ?

Answer 3

QNH = ALTITUDE

QNH (Query Nautical Height) is the pressure at mean sea level.

It can used to find the ALTITUDE of an aircraft

Question 4

How do you figure out Flight Level (FL)?

Answer 4

Use (ISA) Standard Pressure Setting (1013.2 hectopascals)

Every 27ft = 1hpc

Question 5

When do you change from Altitude to Flight Level?

Answer 5

The Transition Layer is where a change happens to the Transition Level. Below the layer is know as Transition Altitude

Different in every country

Question 6

Which pressure settings to use?

Answer 6

Take-Off: QNH or QFE of Aerodrome

Below Transition Altitude: QNH

Above Transition Layer: Standard Pressure setting (SPS) (1013.2)

On airways: SPS