EXAM REVISION

Question 1

Met - Exam revision

The Formula for working out Density Altitude from Pressure Altitude with a given OAT

Answer 1

DA = PA - (120 x ISA DEV)

Density altitude = Pressure Altitude - (120 x ISA Deviation)

Question 2

Met - Exam revision

An aircraft is at FL100 and the OAT is -35℃. What is the Density Altitude

Answer 2

6400 FT

ISA DEVIATION
* 15 - (alt x 2) where altitude is the pressure altitude of 10,000 feet
* 15 - (10 x 2) = -5℃
* OAT given is -35℃
* (-35℃) - (-5℃) = -30℃
* ISA DEV -30℃

DESNITY ALTITUDE
* DA = PA - (120 x ISA Dev)
* DA = 10,000 - (120 x -30)
* 10,000 - 3600
* DENSITIY ALTITUDE 6400 ft

Question 3

The Formula for working out Pressure Altitude from True Altitude

Answer 3

PA = TA - 30 x (Local QNH - 1013)

Question 4

Transition Level: FL190
Transition Altitude: 18,000 ft
QNH 1023 hPa

A flight crew who faces an emergency at cruis level decides to turn back to the departure aerodrome. Due to the dynamic situation, the crew forgets to set local QNH. What will be the altimeter reading after landing (Assume 1 hPa = 27 ft)

Exams now typically use 1 hPa = 30 ft

Answer 4

53 ft

• use formula

Question 5

ATPLQ | Composition, Extent, Vertical Division

Calculating average tropopause height

Answer 5

TROP HEIGHT = ( 16 X COS(LAT) ) X 3280

Winter subtract 3000 ft, Summer add 3000 ft

Question 6

ATPLQ | Atmospheric Pressure

Half of Air Pressure
Half of Air Density

Answer 6

1. 18,000 ft
2. 22,000 ft

Question 7

ATPLQ | ISA

Lapse rate

Answer 7

2℃ / 1000 ft
0.65℃ / 100 m
6.5℃ / 1000 m

Question 8

ATPLQ | Wind

Calculating temperature rise on lee side of mountain

Answer 8

TEMP RISE = ( LEE CBa - WINDWARD CBa ) X 1.2

Where Cb = cloudbase

Question 9

ATPLQ | Wind

Iso - Lines joining equal “something”

Answer 9

ISOBAR - PRESSURE
ISOHYPES - HEIGHT
ISOTHERM - TEMPERATURE
IOSTACH - SPEED