VISUALLY EXAMINE THE BRUSH ASSEMBLIES FOR DISCOLORATION IN THE STARTER AFTER YOU TRY TO START THE APU A THIRD TIME.
-51.1 -40.0 -28.9 -17.8 -6.7 15.6 37.8 60.0
(-60) (-40) (-20) (0) (20) (60) (100) (140)
OUTSIDE AIR TEMPERATURE, `C (`F)
MAXIMUM TIME TO START
Operation Limits
Figure 201 (Sheet 4)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
TEMP BAROMETRIC PRESSURE, Hg
`F `C 28.00 29.00 30.00
10 20 50 80 90 100 0 60 70 30 40 -17.8 -12.2 -6.7 -1.1 4.4 10.0 15.6 21.1 26.7 32.2 37.8 42.0 44.0 43.0 41.0 40.0 39.0 38.0 37.0 36.0 35.0 34.0 46.0 45.0 43.0 42.0 41.0 40.0 39.0 38.0 37.0 36.0 35.0 46.0 47.0 45.0 44.0 43.0 42.0 41.0 39.0 38.0 37.0 36.0
MINIMUM AIR PRESSURE OF THE APU BLEED, PSIG
NO ELECTRICAL LOAD
NO BLEED AIR LOAD
Operation Limits
Figure 201 (Sheet 5)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(4) Figure 201A shows the normal operating temperatures for the outside air temperature (OAT) and the APU exhaust gas temperature (EGT) in the fully loaded condition. Figure 201B shows the normal operating temperatures for the outside air temperature (OAT) and the APU exhaust gas temperature (EGT) in the main engine start condition.
B. Special Tools and Equipment
(1)
F80164-35 Screen - Air Inlet
(2)
F80164-28 Bolt - Latch
C. References ú (1) AMM 12-11-00/301, Fuel System
(2) AMM 12-33-01/301, Cold Weather Maintenance
D. Access
(1)
Location Zones
101 Control Cabin, LH
102 Control Cabin, RH
205 Electronic Compartment
215 Left Main Wheel Well
(2)
Access Panels
1101 External Power Receptacle Door
1201 Electronic Equipment Access Door
E. Procedure ú ú S 862-260 ú ú
WARNING:_______IF A REFUELING OPERATION IS IN THE AREA, OBEY THE WARNINGS AND ú CAUTIONS IN THE REFUELING PROCEDURE BEFORE YOU DO THE APU START ú AND OPERATION PROCEDURE. IF YOU DO NOT OBEY THE WARNINGS AND ú CAUTIONS, INJURY TO PERSONS CAN OCCUR. ú ú (1) If there is a refueling operation in the area, make sure you obey ú the WARNINGs and CAUTIONs in the refueling procedure ú (AMM 12-11-00/301).
S 492-216
(2)
If you must operate the APU when the service door for the aft galley is open, install the air inlet screen to the airplane (Fig. 202).
S 712-053
(3)
Set the master dim and test switch to TEST to make sure the APU indicator lights on the P5 forward overhead panel operate correctly.
S 862-054
(4)
Make sure these circuit breakers are closed:
(a)
E3-3 Electrical Shelf, APU Control Unit
(b)
P6-2 Load Control Center Assembly
1) MASTER WARN & CONT
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