Here the one and only true word , don't nail me on the A330 AMM
When you set the toggle switch 3LA to the ON-1 (ON-2) position the logo lights come on automatically with the
NAV1 (NAV2) lights during the subsequent flight phases:
- taxiing,
- take off,
- landing
When you set the toggle switch 'NAV/LOGO' 3LA to the ON-1 (ON-2) position, the relay 4LA (5LA) energizes
and supplies 28VDC to relay 3LY. The ground signal is supplied from two sources
Landing Gear Control and Interface Unit (LGCIU) 5GA2, when the landing gear struts are compressed (e.g.
taxiing),
and/or
Slat Flap Control Computer (SFCC) 21CV (22CV), when the flaps are lowered to 15 degrees or more (e.g.
take-off, landing).
The use of NAV/LOGO lights is advised by the authority.
rgds