Discussion
In level unaccelerated flight, the accelerometers provide
Answer: A
Correct answer: A reference to the local vertical
In level unaccelerated flight the only specific force acting is the reaction to gravity, so the accelerometer triad senses a vector of magnitude \( g \) pointing along the local vertical. Resolving that vector in body axes gives pitch and roll directly - the levelling function.
The reference is good only while the aircraft is unaccelerated, because an accelerometer cannot distinguish acceleration from gravity: both appear as specific force. That is why the vertical reference is used as a slow, long-term correction to the gyro-derived attitude rather than as an instantaneous measurement. Heading, rate of turn and airspeed come from other sensors entirely.
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