On 10-Jan-2004, (Nathan Young) wrote:

I like the idea of adding an elec AI to the panel, but until you can
add dual alternators and a split bus to your plane, I would not remove
the vacuum one, nor do I think the FAA would allow you to remove the
vacuum gyro.


I fully agree with this . At most, the complete vacuum system, including
gyros, costs just a few pounds and provides full redundancy in case of
electric failure or failure of any one instrument. Why get rid of it?

We have a backup electric AI in our Arrow, and I consider it virtually
essential for safe IFR operations. BTW, a good backup for the vacuum DG is
the HSI function on a yoke-mounted GPS.

--
-Elliott Drucker