<![CDATA[F70/F100 ignition panel differences]]>I'm in the manual and the picture of the ignition shown is from the F70 (AUTO, NORM, CONT, RE LIGHT), however the description appears to only apply to the F100. What is the function of the AUTO in the F70?

I attempted to start the engines with ignition in AUTO, and got a very loud GPU sound (and very low N2 spoolup).

]]>https://community.justflight.com/topic/10817/f70-f100-ignition-panel-differencesRSS for NodeTue, 30 Jun 2026 16:40:10 GMTMon, 29 Jun 2026 18:24:36 GMT60<![CDATA[Reply to F70/F100 ignition panel differences on Mon, 29 Jun 2026 20:06:09 GMT]]>Yes- by this time during boarding the GPU had already been dismissed, but the sound was something like a GPU with extra load/stress on it- puzzled me since it wasn't even attached to the aircraft. It was in the F70 that this happened, I have not tried in the F100. Once I did nothing else but switch to NORM, the N2 spooled up just fine. I believe the APU bleed pressure was unchanged.

]]>https://community.justflight.com/post/51586https://community.justflight.com/post/51586Mon, 29 Jun 2026 20:06:09 GMT<![CDATA[Reply to F70/F100 ignition panel differences on Mon, 29 Jun 2026 20:02:31 GMT]]>I just finished a flight with the ignitors in AUTO with no problems. Low N2 spooling sounds more like an APU bleed issue. The GPU (Ground Power Unit) would have nothing to do with the starting of engines and would in fact be disconnected at the time of engine start. Did you have the APU running?

]]>https://community.justflight.com/post/51585https://community.justflight.com/post/51585Mon, 29 Jun 2026 20:02:31 GMT