Originally Posted by
ok45
I'm flying the A320, if its powered on by APU, you will hear the APU, no need nav light to tell you. If it runs solely on battery the nav light will probably not be illuminated (aka shed) anyway, so I can't understand the "navlight-indicates-powered-on" argument. ✌️
Unlikely you’re the only jet airplane on the ramp.
Wearing ear protection or operating noisy machinery such as tugs and loaders:
Beacon on - ready for pushback/engine start
Nav lights on - aircraft under electrical power