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Anybody got any thoughts on the flying with a nav light/landing light out question?
If your MEL etc. doesn't prohibit operation, then the question is probably aimed at seeing if you know that in the UK at least, ATC can give you permission to operate minus a Nav. Light.
The MEL is applicable up to the point at which the aircraft begins to move under its own
power.
So if you already know it during the walk around, it's not legal to go. (I don't know about the derogations from ATC).
But if you discover it at the holding point, you can go.