F99740 G00368
APU Circuit 563
49-11-0 Page 4 Figure 1 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/85
591 APU Circuit
Feb 20/84 Figure 1 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-11-0 Page 5
APU POWER PLANT - MAINTENANCE PRACTICES
1. General
A. The maintenance procedures included in this section provide instructions necessary for APU power plant operation and general maintenance. Included in this section are the following paragraphs, listed in order of most common usage.
(1)
Operate APU
CAUTION: TO AVOID DAMAGING APU, OBSERVE OPERATING LIMITS (FIG. 201).
(2)
Motor APU
(3)
Depreserve APU
(4)
Purge APU fuel system
(5)
APU fuel system leak check
(6)
APU control air pressure line leak check
(7)
Procedure following over-temperature during start
(8)
Procedure to remove and install tachometer - generator assembly
2. Operate APU
A. General
(1)
This procedure provides the instructions necessary for operating the engine under normal conditions. Emergency shutdown modes are also included. This procedure may be used for checking operation of the engine or related systems when engine operation is required.
CAUTION: WHEN ICING CONDITIONS EXIST, ATTEMPTS TO START APU WITH ICE FORMED AROUND INLET DOOR VORTEX GENERATOR HINGED FLAP COULD RESULT IN OVER-HEAT DAMAGE TO THE INLET DOOR ACTUATOR MOTOR AND SLIP CLUTCH. (REF 12-50-0, DEICING PROCEDURE)
(2)
Recommended engine operating conditions, limitations and fuel requirements are outlined in Fig. 201. When an over-temperature condition has occurred, the engine should be shut down. The engine should not be restarted until the cause of the over-temperature is corrected.
(3)
High temperatures will be found up to 30 feet from the exhaust nozzle depending on wind conditions. Occasionally when the APU is started, excess fuel that has accumulated in the tailpipe ignites and long flames are blown out of the exhaust nozzle. Starts must not be attempted within range of flammable material or fumes.
(4)
The APU engine is shut down in three different ways: using the master switch, using the fire switch in control cabin or in the main landing gear wheel well on the right side, and engine automatic shut down. The engine shuts down automatically in event of engine low oil pressure, high oil temperature, overspeed, and high temperatures sensed by the fire detection system.
B. Prepare to Operate APU
(1) Check that the following circuit breakers on circuit breaker panel P6 are closed:
(a)
LANDING GEAR, ANTISKID, LIGHTS
(b)
LANDING GEAR, ANTISKID, TEST
(c)
FIRE PROTECTION, DETECTION, APU
511
May 20/82 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-11-0 Page 201
T54580 E41812 E63888
Operating Limits 513
49-11-0 Figure 201 (Sheet 1) May 01/03
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
584 Operating Limits
Feb 01/95 Figure 401 (Sheet 2) 49-11-0
Page 202A
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Operating Limits 584
49-11-0 Figure 201 (Sheet 3) Feb 01/95
Page 202B
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(d)
FIRE PROTECTION, DETECTION, MASTER WARN & CONTR.
(e)
MASTER CAUTION BUS, BAT.
(f)
PANEL & INSTRUMENT, DIM & TEST.
(g)
Nine circuit breakers under INDICATOR LTS, MASTER DIM BUS.
(h)
APU GENERATOR CONTROL
(i)
APU CONT
(j)
HOT BAT, BAT BUS CONT
(k)
HOT BAT, GEN CONT
(l)
HOT BAT BUS
(2)
Check that circuit breaker on generator control unit is closed. (Generator control unit is located in P6 panel area.)
(3)
Check that circuit breaker on face of APU control unit is closed. (APU control unit is located in electrical & electronic bay.)
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