"Peter" wrote in message
...
| C J Campbell wrote:
|
| It is a Garmin 1000 system with battery backup (not certified for part
135
| IFR, though).
|
| So, if an aircraft has a second electrical source (among the other part
| 135 requirements - dual vacuum, etc), will an aircraft with this
| avionics configuration be certified for part 135 IFR, or is there
| something specific about the Garmin 1000 system that does not allow it
| to be certified at this time?
|

The backup battery is only good for thirty minutes, and Cessna has not
applied to certify the backup system for IFR.