Altimeter - Ch 3

Question 1

Altimeter

Answer 1

Aneroid Gauge - 1 feed into it (static)
Climb = expand Descend = Contract
Supported by a spring

Senses static Pressure compared to reference pressure - not linear

Question 2

Height

Answer 2

Above GL with QFE set

Question 3

Altitude

Answer 3

Above MSL with QNH set

Question 4

Pressure Altitude

Answer 4

Altitude set with SPS set (1013.25) (FL)

Question 5

Design Challenges

Answer 5

Non-linear change with alt

• Variable-Magnification lever system
• Specially designed Instruments

Less accurate with alt
Rate of pressure change decreases with Alt

Reference Pressure setting used for starting point

Question 6

Errors

Answer 6

IMP

TBT

Question 7

If static line becomes blocked

Answer 7

The display will freeze

Smash glass to fix this in an unpressurised cabin
If outside the px hull, alt will work but less accurately
If inside the px hull, it will under read

Question 8

The 3 generations of altimeters

Answer 8

Simple
Sensitive
Servo (assist) altimeter