Safety/Emergency Procedures
Instrument Flight
STANDBY GYRO FAILURE
As opposed to an ADI failure, a standby gyro failure is not a significant problem. With this failure, you
cannot use the standby AI as a cross-check for the ADI. Of course, if the ADI has previously failed or if its
indications are suspect, a standby gyro failure becomes a serious matter.
Figure 44 shows one of the possible indications of a failed standby gyro. Remember that 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 3 inch standby gyro will continue to
provide reliable altitude reference for up to 3 minutes after failure. In cockpits where the new 2-inch
standby gyro is installed, it will continue to provide reliable altitude reference for up to 9 minutes after
failure.
OFF
CLI
MB
Figure 44: FAILED 3” STANDBY GYRO/FAILED 2” STANDBY GYRO
The procedure for dealing with a standby gyro failure is:
1.
Use the ADI.
2.
Check the electrical system.
3.
Watch for possible progressive failure.
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