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IR exam instruments question

 
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rusty1983



Joined: 10 Jul 2017
Posts: 5

PostPosted: Fri Jul 14, 2017 7:54 am    Post subject: IR exam instruments question Reply with quote

Hello,

Got during my Instrument rating exam another question, where even our maintenance mechanics could not help me...

Which TWO instruments are adversely affected by an electrical power failure in flight?:
A. ASI
B. Magn. compass
C. DI
D. AI
E. CDI

A and b definitely not. I would have chosen c,d,e but the question said TWO, and now i am struggling. The discussion with the mechanics ended up that it's c and d, but also a cdi could be affected depending on an old or new one...

So hopefully someone here knows the right answer and can explain why.

Appreciate it, thx
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rusty1983



Joined: 10 Jul 2017
Posts: 5

PostPosted: Wed Jul 19, 2017 8:45 am    Post subject: Reply with quote

Found the answer its D and E.

The DI gyro is operated by the engine suction pump and not affected.
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rusty1983



Joined: 10 Jul 2017
Posts: 5

PostPosted: Sat Jul 22, 2017 7:35 am    Post subject: Reply with quote

So I got now again feedbacks and found some interesting in internet:
Link: http://www.cfinotebook.net/notebook/...scopic-systems

With this in mind, the correct answers are:
Magnetic compass and CDI

And I was always so sure that the magn. Compass is definitely not adversely affected, but I think this is the reason why the authorities use these words. Only to trick you around and make you doubting your thoughts, even when they are right.
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