L-1011 Trainer Installation: %RPM N3 Power-Up and BITE

L-1011 Trainer - %RPM N3 Power-Up

The %RPM N3 indicators receive 115VAC, 400Hz power from the AC Standby Bus. So they are part of the essential engine instrumentation. The indicator has an Overlimit Painter that will record any overspeed condition. The pointer will remain at overspeed indication until 28VDC is supplied to the Reset Solenoid in the instrument. Current, we have not connected the reset circuit quite yet ... but it will be one of the next things.

BITE: Depressing the Test switch on the lower left hand side of the indicator face should cause the pointer and counter to read 64.0%

Below is a short video showing the indicator BITE in action:

%RPM N! and N3 from Delta L-1011 Pilot's Reference