Discussion
Arrange these events in a vacuum-driven gyro failure:
1. The filter progressively clogs and airflow falls
2. Rotor speed decays and angular momentum falls
3. The same disturbing torques produce larger precession
4. The indication drifts increasingly from the true attitude
5. The crew identifies the failure by cross-checking other instruments
Select the correct sequence.
Answer: D
The failure is gradual rather than abrupt, which is exactly what makes it dangerous: the instrument keeps producing a plausible indication while becoming steadily wrong. Splitting instruments between air and electrical drive exists to break that chain.
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