4. Altimetry

Question 1

List four reasons why vertical navigation (precise altitude awareness) is of vital importance to the pilot.

Answer 1

terrain awareness;
aircraft separation;
weather avoidance;
aircraft performance

Question 2

Altitude means vertical distance above …….. …….. …….. and is shown correctly on an altimeter when the prevailing …….. has been set on the subscale.

Answer 2

mean sea level; QNH

Question 3

Height means vertical distance above a specified ……..; it is shown on an altimeter when the appropriate …….. has been set on the subscale.

Answer 3

datum; QFE

Question 4

To read pressure altitude, what setting will you need on the subscale of your altimeter.

Answer 4

1013.2 hpa

Question 5

In the lower levels of the International Standard Atmosphere (ISA), the pressure decreases approximately one hpa for each …….. ft increase in altitude.

Answer 5

30

Question 6

If you maintain a constant altitude indication and do not change the subscale setting on the altimeter when flying from an area of high pressure to an area of low pressure, the altimeter will (under-read / over-read / read correctly).

Answer 6

over-read

Question 7

List two vitally important reasons why you should set QNH.

Answer 7

terrain clearance;

aircraft seperation

Question 8

The cruising level for a VFR flight on a (true / magnetic) track of 249 degrees is (odd / even) feet plus 500.

Answer 8

magnetic; even

Question 9

For flight along the coast below 10,000 ft on a magnetic track of 318 degrees, available cruising levels are …….., …….., …….. and ……..

Answer 9

3,500; 5,500; 7,500; 9,500ft