Discussion
An aircraft flies close to a large area of magnetic anomaly and the heading output momentarily wanders before recovering, while pitch and roll remain steady.
What is the most likely explanation?
Answer: A
Correct answer: The magnetometer was disturbed
The symptom localises the fault precisely: heading wanders while pitch and roll stay steady. Heading is the one output that depends on the magnetometer, and pitch and roll come from the gyros and accelerometers, so a disturbance confined to heading points to the magnetic sensor. A large magnetic anomaly distorts the local field, and the recovery on leaving the area confirms it.
A gyro failure would corrupt attitude as well, since the same triad feeds all three angles. Accelerometer saturation would show in pitch and roll, and a lost alignment would not recover by itself.
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