Discussion
Statement I: The attitude indicator shows a false nose-up pitch during acceleration.
Statement II: Its erection sensor cannot distinguish acceleration from a change in the direction of gravity.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Both Statement I and Statement II are correct
Both are true and the second is the reason. The erection system senses the direction of the apparent vertical by pendulous means, and a pendulum responds to the resultant of gravity and any acceleration.
Under forward acceleration that resultant tilts aft, and the system erects the gyro towards it - producing a false nose-up indication just when the aircraft is accelerating for take-off. The effect is small and slow, since erection is deliberately weak, but it is enough to matter.
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