Quantcast Standby Attitude Indicator Failure - P-12850099

 

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T-45C TS & ADV BIFP-09
Instrument Failures
STANDBY ATTITUDE INDICATOR FAILURE 1.8.1.7.6.2
As opposed to an ADI display system failure, a standby AI failure is not normally a
significant problem. With this failure, you will lose the standby AI as a cross-check for
the ADI display. Of course, if the ADI display has previously failed or if its indications
are also suspect, a standby AI failure becomes a serious matter, especially, when IFR/
IMC.
Figure 1 shows one of the possible indications of a failed standby AI. The power-off
flag does not have to be present for the indicator to give a false reading because the
flag signifies only a lack of electrical power.
NOTE: After loss of power with the power-off flag in view, the 2" standby AI will
continue to provide reliable attitude reference for up to 9 minutes after failure.
OFF
CLI
MB
UL L
C
A
G
Figure 1: FAILED STANDBY AI
The procedure for dealing with a standby AI failure is:
1. Use the MFD ADI display.
2. Check the electrical system.
3. Watch for possible progressive failure of other instruments or systems.
AOA INDICATOR FAILURE 1.8.1.7.4.2
Loss of only the AOA gauge indicator is not a significant problem, so long as you are
still able to read correct AOA digital information on the MFDs and HUD. If both the
AOA indicator and digital AOA readouts have failed (or become incorrect), the pilot will
have to fly airspeed instead of AOA. The cockpit AOA indexer lights may still be
(8-99) Original
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