Standby Attitude Indicator; Standby Compass - BOMBARDIER LEARJET 40 Pilot's Manual

Pilot's Manual

STANDBY ATTITUDE INDICATOR

The standby attitude indicator provides a visual indication of the air-
plane flight attitude. It is located in the center of the standby instrument
group (Figure 5-9) where it can be viewed easily by both pilots. It is
powered from the emergency battery bus so that it will remain pow-
ered for at least one hour after the loss of airplane generator power. The
standby attitude indicator will continue to provide an accurate display
of aircraft attitude for a further nine minutes after the loss of all airplane
power.
The indicator is an electrically-driven gyro whose vertical attitude is
maintained by a mechanical erection system. The power warning flag
is pulled from view after the gyro has spun up to valid operating speed
and reappears if there is any interruption of source power or the unit is
in caged mode.
Back lighting is provided by 5-vdc to illuminate the standby attitude
indicator at night.

STANDBY COMPASS

The standby compass is located at the top of the windshield center post.
It is a magnetic compass that does not require any electrical power to
provide the crew with a continuous standby heading display. The only
electrical input to the compass is 5-vdc to illuminate the compass at
night.
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PM-132A