Beacon Light
Would like to when the rotating Beacon light on top and bottom of the aircraft can be switched On.
For example an airline that I know wants the pilots to switch On the beacon before commanding the cabin crew to arm slides. As I understand the beacon is switched On only after the ATC clears to start engines so that personnel/vehicles in the vicinity are aware. If it is switched On before that it may bring vehicular traffic around it to a halt needlessly.
Any documentation in this respect will be appreciated. thanks.