Originally Posted by
Cubdriver
The thermocouple is suppressed during heater ignition, and when that stops it shuts off the fuel flow if heater ignition should fail. I have never seen a checklist that called for cabin heat before engine start, but I suppose if one engine quits and then starts dribbling fuel it could get ignited anywhere such as at the heater.
Ahh, that makes sense. Also, I should clarify - the checklist didn't call for it, but back in the day we used to plug in a power cart and run the Janitrol sort of like a mini-apu to preheat the cabin in the 411 before the pax arrived.
I'm again confused by this though: "I suppose if one engine quits and then starts dribbling fuel it could get ignited anywhere such as at the heater."
Huh?