In some situations the EADI and EHSI do not load for some reason. What triggers them to on? It has happened about three times.Chris

Hi Chris,1. Check the dimmer switch. Perhaps they're dimmed all the way to off? You can dim them in the 2D cockpit only.2. IRS's aligned?3. No failures active?Anyone else have any ideas for Chris?Bryan

Thanks, I think it was becasue i left the "KA" enganged on the FMS. It has not happened again.

Thanks for letting me know you got it resolved.Cheers,Bryan