Generator Drive

The IDGs contain the generator and drive in a common housing, and are lubricated and
cooled by a self–contained oil system. An integral electro–mechanical disconnect device
provides for complete mechanical isolation of the IDG.

The generator drive (DRIVE) amber caution light is illuminated when low oil is sensed in the
IDG.

IDG low oil pressure is caused by one of the following:

  • IDG failure.
  • Engine shutdown.
  • IDG automatic disconnect due to high oil temperature.
  • IDG disconnected through generator drive DISCONNECT switch.

A generator drive disconnect switch is installed. This switch disconnects the generator from
the engine in the event of a generator drive malfunction. Reactivation of the generator may
be accomplished only on the ground by maintenance personnel.