APU

APU Operation is Prohibited

1.  Until Test is Completed

2.  Applying De-Ice Fluid

3.  T/R more than 30 sec.

4.  Unattended

5.  Above FL300

APU Start Prohibited:

1.  APU Fail Light Illuminated

2.  Dual Gen Failure

3.  Until 30 sec. Shutdown

    RPM indicates 0%

4.  Above FL200

APU Starter Limits:

3 starts/30 min. 90 sec. rest period

9 APU start cycles per hour

*Main aircraft battery limit

(APU battery start counts as 1/3 of main

engine start)

200 amps/Ground

230 amps/Flight

APU Max N1   108%

       Max ITT 690°

Burns approx.  110 lbs/hr from the right fuel tank.

Low Oil: Add 300cc

Add Oil: 100cc at a time. Must monitor the light

as it's serviced.

Check Oil Within 10 Minutes of Shutdown.

APU Test

EGT 500  ± 10 degrees

RPM 50    ± 5%

Voltmeter  0

APU Relay Engaged Light - Illuminates then extinquishes prior to the READY TO LOAD light.

At 50% speed, the speed sensor signals the GCU

to deenergize the start relay and the APU RELAY ENGAGED extinquishes.

READY TO LOAD Light - At 95% rpm +4 seconds

(start is complete).

Ignition terminates 99%

ECU maintains APU at  100% rpm

±1% (70,200 rpm)

APU ON While Fueling:

If refueling while operating the Aircraft Auxiliary Power Unit (APU), a crewmember must remain with the aircraft for monitoring purposes. APU's shall not be started during the fueling process. Except for emergency purposes, the APU must not be

shut-down during the fueling

process.

GMM Fueling Procedures

Section V

Page 4 of 6  01/01/06