HSI with a suction failure?
Instructor chappies (and chappesses),
I was recently leafing through a book about flying on instruments - and was looking at the difference between a "Direction Indicator" and a "Horizontal Situation Indicator".
I get the impression that an HSI is still a gyro driven DI - but with a few extra goodies attached.
Question: if your aircraft suffers a gyro suction failure, which of the HSI components are usable/unusable?
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