"John Clonts" wrote:

Pretty hard to imagine how a faulty HSI would cause loss of control--
even in inadvertent IMC....

Might that not contribute to the pilot's becming disoriented?

Anyway, that was just an example. It might have been the AI portion of the
display, instead.

If I had to bet, though, my money would be on simple spatial disorientation.
Until you've had it happen to you, you just don't know how easily you can
become completely fuzzled at night if you're not on your guard.
--
Dan
C-172RG at BFM