T-45A UJPT, E2-C2, ADV, & IUT Eng-19
Flight Instruments
NOTE: The two-inch standby AI
provides a minimum of 9 minutes
attitude information after total
electrical power failure.
B.
Standby compass
Sg 4, fr 4
1.
Location: mounted at top of each canopy
bow
2.
Function: conventional wet compass
suspended in damping fluid used as a
backup for heading
STANDBY COMPASS
a.
Contains compass card graduated in
5-degree divisions with cardinal
headings indicated as N, S, E, and W
b.
Compass card floats horizontally
within case to align itself with earth's
magnetic field
c.
Magnetic heading read off card under
lubber line engraved on lens
d.
Two internal bar magnets compensate
for deviation
e.
Compass indication will lead or lag
actual aircraft heading as shown by
SAHRS on HSI, ADI, and HUD during
turns
3.
Controls/switches/indicators: light switch
located above compass
4.
Subsystem interfaces
a.
Power: 5 VAC nonessential bus
b.
Light switch and brightness control
functional when interior lights MIP
dimmer control is rotated out of OFF
position
(8-03) Original
Page 19-21
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