ATR 42 Model : 400/500
AIR DATA SYSTEM
FLIGHT INSTRUMENTS
P 5
NOV 01
001
1.10
.
10
STANDBY ALTIMETER (Mb Counter)
TO
FA
-01-
10-
10-
005-
A010AA
Baroset value
Is displayed in millibars (875 to 1 050 mb).
Baroset knob
Sets barometric reference on mb counter.
Altitude pointer
One revolution of pointer represents 1000 ft altitude change.
Altitude counter
The digital counter is equipped with three drums indicating ten thousands,
thousands and hundreds of feet. A black and white flag marks the LH drum (ten
thousands) when altitude is between 0 and 9999 ft. An orange and white flag
marks the two LH drums (ten thousands and thousands) when altitude is below 0 ft.
Note : Allowable deviation between normal altimeter indications and between
normal and standby altimeter indications :
FL (ft)
NORM/NORM (ft)
NORM/STBY (ft)
0
55
70
5.000
60
150
10.000
70
200
20.000
100
260
25.000
120
300
AA
1
2
3
4
R
R
R
R
R
R
R
AviationLearning.net
01/07//2018 REV 1 These notes are not revised after issue For Training Purposes Only
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