Discussion
Arrange the steps by which an erection system corrects an attitude indicator:
1. A pendulous sensor detects departure from the vertical
2. A small torque is applied to the gimbal
3. The gyro precesses at 90 degrees to the applied torque
4. The spin axis moves back towards the vertical
5. The sensor returns to its null position
Select the correct sequence.
Answer: C
The loop deliberately exploits precession rather than fighting it, applying torque in the axis that produces the wanted motion. Because the sensor cannot tell gravity from acceleration, the same loop generates the turn and acceleration errors.
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