| Grey Backdrop |
| APU |
OFF – Normal position when the APU is not running.
- Positioning the switch to OFF with the APU running
trips the APU generator off the bus(es), if connected,
and closes the APU bleed air valve. The APU
continues to run for a 60 second cooling period.
- The APU air inlet door automatically closes after
shutdown.
Operate the APU for one full minute with no bleed air load
prior to shutdown. This cooling period is recommended to
extend the service life of the APU. When the APU switch is
moved to OFF, this time delay is met automatically.
Moving the APU switch to OFF trips the APU generator,
closes the APU bleed air valve and extinguishes the APU
GEN OFF BUS light. Shutdown occurs automatically after 60
seconds. When the APU speed decreases sufficiently during
shutdown, the fuel valve and inlet door close.
prior to shutdown. This cooling period is recommended to
extend the service life of the APU. When the APU switch is
moved to OFF, this time delay is met automatically.
Moving the APU switch to OFF trips the APU generator,
closes the APU bleed air valve and extinguishes the APU
GEN OFF BUS light. Shutdown occurs automatically after 60
seconds. When the APU speed decreases sufficiently during
shutdown, the fuel valve and inlet door close.
| Tap the APU switch to start the APU |