Discussion
Statement I: Accelerometers give a usable vertical reference in steady flight only.
Statement II: They measure specific force and cannot separate acceleration from gravity.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second is the reason for the first. An accelerometer measures specific force and cannot distinguish the reaction to gravity from the aircraft's own acceleration, since both appear identically at the proof mass - the equivalence principle in instrument form.
So the triad gives a usable vertical reference only when the aircraft is unaccelerated; under acceleration the apparent vertical tilts by \( \arctan(a/g) \), which for \( 2\ \mathrm{m/s^2} \) is over eleven degrees. The filter therefore trusts the accelerometers as a slow correction and leans on the gyros through manoeuvres.
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