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Old December 31st 04, 12:36 PM
Juan Jimenez
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"M" wrote in message
ps.com...
I'm considering adding a second (backup) electric AI. The primary AI
is vacuum driven so is the DG.

Two questions: 1. Does adding a backup electric AI require an 337?


Not necessarily. A repair station may be able to perform the work based on a
work order approval, since it's not really a major alteration. Ask your
local avionics shop.

2. Does the electric AI needs to be TSO'ed?


That I don't know, but aren't you adding this to improve safety of your
aircraft? From my point of view, that should make the answer obvious.

Juan