Originally Posted by
TopSwiss 737
If I remember correctly, on the A320 family the logo lights are illuminated with the NAV lights switched on and the aircraft is on ground (weight on wheels) or when the flaps are out of up.
I gladly admit not having an idea that such logic even existed. Never too late to learn I checked FCOM (1.33.20 p4) for more. Technically speaking it says "flaps are extended to at least 15°".
Further reading (1.27.50 p5) revealed that F=1 is 10° (319/20/21), and F=2 is 15° (319/20), or 14° (321).
Interestingly, this would mean that for 1+F departures logo will go out upon liftoff for 319/20 and the same applies for CF 2 departure on a 321.
Pictures I could find :
Swiss A319
TAP 320
But can anybody tell if the Swiss is really 1+F as opposed to TAP being CF 2 ?