Originally Posted by
Nescafe
From the AW139 Technical Notes
”Red Gang Bar moved backwards cuts off all aircraft electrical power sources at the same time. (Gen 1 & 2 and Battery Master switches are moved to OFF all together.)”
The Battery Master switch needs to be on to enable the Main and Aux to be connected to Main Bus 1 & 2.
Thanks - seems to corroborate my info. So, given that most AHRS normally take about 30” to come online when sitting on the ground motionless, and a minute or two in flight, or on a moving deck, one can imagine that they take a bit longer while doing aerobatics!