diamondaviators.net

blsewardjr wrote: ↑Sun May 24, 2020 1:27 am For the backup instruments

I figured, but - really? You're more likely to have to replace a vacuum pump for your backup instruments than to actually need the backup instruments. Everyone else backs up glass with electrical backup instruments, often with battery backup for the backup instruments.

Rich wrote: ↑Sun May 24, 2020 1:32 am

blsewardjr wrote: ↑Sun May 24, 2020 1:27 am For the backup instruments

I figured, but - really? You're more likely to have to replace a vacuum pump for your backup instruments than to actually need the backup instruments. Everyone else backs up glass with electrical backup instruments, often with battery backup for the backup instruments.

I flew lots of C172S in my primary which had G1000 and vacuum driven backup AI.

Yeah, kinda crazy. When you say "everyone else", you're maybe referring to Cirrus? Not Textron or Piper.

Boatguy wrote: ↑Sun May 24, 2020 4:23 am

Rich wrote: ↑Sun May 24, 2020 1:32 am

blsewardjr wrote: ↑Sun May 24, 2020 1:27 am For the backup instruments

I figured, but - really? You're more likely to have to replace a vacuum pump for your backup instruments than to actually need the backup instruments. Everyone else backs up glass with electrical backup instruments, often with battery backup for the backup instruments.

I flew lots of C172S in my primary which had G1000 and vacuum driven backup AI.

Yeah, kinda crazy. When you say "everyone else", you're maybe referring to Cirrus? Not Textron or Piper.

Cirrus and Diamond of course. I haven't dug into everyone's offerings but a couple of checks of current panels from others support my view that this approach is rare these days. I'm thinking even new 172's have now lost this system.

When you say instruments (plural) that's not quite right. It's only the backup AI (singular) that uses it. So to power that 1 instrument you put in the entire known-to-be unreliable additional system, including the gauge to monitor it?