Discussion
Assertion (A): Alignment must be carried out with the aircraft stationary.
Reason (R): Levelling assumes the only specific force present is the reaction to gravity.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the second is the reason for the first. Levelling determines initial pitch and roll by assuming the only specific force present is the reaction to gravity, so that the sensed vector defines the local vertical.
Any motion of the aircraft adds specific force of its own and tilts that vector, so the assumption fails and the initial attitude is wrong. The same applies to the initial bias estimates, which assume the true rates are zero. This is why alignment is carried out at the stand and why a system cannot align while taxiing.
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