APU CONTROL

APU SELECTOR KNOB

OFF: Normal shutdown is initiated. Pneumatic power is removed immediately, electric power is removed at the end of a 1-minute cooldown. Rotating the knob back to ON during shutdown cancels the shutdown sequence.

ON: Normal position when running.

START (Momentary position): Initiates the APU start cycle.

Note: APU electrical and pneumatic are available 3 seconds after reaching 95% rpm.

APU EMERGENCY STOP BUTTON

PUSH IN: Closes the APU shutoff valve, shutting the APU down without a cool down period. White bar illuminates in the lower half of the button.

PUSH OUT: Normal Position.

Red striped bar in the top half of the button illuminates in the event of an APU fire. When pushed in a white striped bar illuminates and the APU FIRE EXTINGUISHER button illuminates.

APU Fuel Supply:

• DC power only the DC fuel pump provides fuel to the APU.

• AC power available with engines off, the fuel is provided by the AC fuel pump 2.

• Right engine running fuel is supplied by the ejector fuel pump from the right wing tank.

• Fuel normally supplied from the right or left fuel tank through the crossfeed valve.