Altimeter

Question 1

Altimeter at high levels

Answer 1

Less accurate as the rate of change of pressure is not constant

Question 2

Flying from high to low temp

Answer 2

Altimeter will over read

Question 3

Difference in lapse rates between cold and warm air

Answer 3

Cold air up to 10,000(700hpa) = 20ft/hpa

Warm air = 36ft/hpa

Question 4

Altimeter lag error

Answer 4

Climb = under read

Descent = over read

Question 5

How to increase the sensitivity of the altimeter

Answer 5

Increase the layers of the aneroid
Double needle
Jewelled bearings, reduces friction
Vibrator, reduces friction

Question 6

Blockage on the static port for an altimeter

Answer 6

Blockage in the static line will freeze the reading

Question 7

Leakage in the static line for an altimeter

Answer 7

Pressurised hull - altimeter will under read due to the higher pressure inside

Unpressurised - wont change that much but wont be accurate and may over read due to cabin suction

Question 8

Difference between transition level and transition altitude

Answer 8

Altitude - way up

Level - on the way down

Question 9

Calculating density altitude

Answer 9

For every degree from isa deviation add 120