Discussion
Arrange the steps of ground alignment in order:
1. The aircraft is held stationary
2. Accelerometers sense the gravity vector and establish level
3. Heading is established from the magnetometer or by gyro compassing
4. Initial gyro biases are estimated
5. The system declares itself aligned and available
Select the correct sequence.
Answer: C
Everything afterwards is computed as a change from this initial state, so an error here persists for the whole flight. Movement during alignment corrupts the gravity reference, which is why the aircraft must be held still.
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