Altimetry

Question 1

What is a standard day?

Answer 1

1) 29.92 inHg (1013.25 hPa) at sea level
2) 15C at sea level
3) Temp decrease at -1.98C per 1000ft

Question 2

What is QNE?

Answer 2

Atmospheric pressure (or isobar) of a standard day at sea level; 29.92 inHg

Question 3

What is QFE?

Answer 3

Atmospheric pressure at a set point, like an aerodrome. When set to QFE, altimeter will read the height above set point.

Can be remembered as “Query: Field Elevation”

Question 4

What is QFF?

Answer 4

Mean sea level pressure derived from actual conditions.
For meteorologists.
(Produces an altimeter with no error when at mean sea level)

Question 5

What is QNH?

Answer 5

Actual atmospheric pressure at sea level.
When set to QNH, altimeter will read altitude.

Can be remembered as “Query: Nautical Height”