Instrumentationhard#419
Gimbal lock in a conventional attitude indicator occurs when:
A
The aircraft exceeds Mach 1
B
The vacuum system fails
C
The aircraft banks beyond approximately 110° or pitches beyond 70-80°
CorrectD
The gyro spin speed drops below minimum
Explanation
Exceeding the gimbal limits (typically about 60-70° pitch or 100-110° bank) causes gimbal lock, toppling the gyro.
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