Atmospheric Pressure - Chapter 3 (& Glossary)

Question 1

QFE (definition)

Answer 1

Pressure setting at an aerodrome/airfield

Question 2

QFF (definition)

Answer 2

Mean Sea Level (MSL) pressure using actual conditions

Question 3

QNH (definition)

Answer 3

MSL calculated using ISA conditions

Question 4

SPS (Definition)

Answer 4

Standard Pressure Setting (1013 hPa)

Question 5

1hPa = ? Ft

Answer 5

1hPa = 27ft

Question 6

QNH (Maths Equation)

Answer 6

QNH = QFE + (Airfield Level/27)

Question 7

Height (Definition)

Answer 7

Vertical distance set on QFE between A/C and Aerodrome.

Question 8

Altitude (Definition)

Answer 8

Vertical distance set on QNH between A/C and MSL

Question 9

True Altitude (Definition)

Answer 9

Exact vertical distance between A/C and MSL. This takes into account the deviation for differing temperature (compared to ISA)

Question 10

Elevation (Definition)

Answer 10

Vertical distance of terrain, airfields and obstacles from MSL

Question 11

Pressure Altitude (definition)

Answer 11

Pressure is sensed to determine altitude (i.e. 301 hPa = 30,000ft). 1013 hPa must be set on the sub-scale reading.

Question 12

Density Altitude (Definition)

Answer 12

Density is used to determine altitude (i.e. 0.302 kg/m^3 = 40,000ft) - This is used in performance calculations

Question 13

Flight Level (Definition)

Answer 13

Pressure Altitude levels based on 1013 hPa in hundreds of feet. Minimum separation is 500 feet. FL 400 = 40,000 ft. FL050 = 5,000ft.

Question 14

Transition Level (Definition)

Answer 14

When climbing through the transition level, 1013 hPa is set instead of the QNH on the sub-scale reading to fly at flight levels