Discussion
A flux valve is usually mounted in a wingtip or fin to
Answer: D
Correct answer: Keep it clear of airframe disturbance
A flux valve is mounted in a wingtip or fin to get it as far as possible from the aircraft's own magnetic influences - ferrous structure, electrical cabling, motors and avionics - all of which distort the field it is trying to measure. The remaining error is compensated by a swing that determines the hard-iron and soft-iron corrections.
Vibration and temperature are worse in an extremity, not better, and the cable run is longer, not shorter. Magnetic cleanliness is worth those penalties because a distorted field produces a heading error that no amount of filtering can distinguish from the truth.
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