737 AMM 飞机维护手册 机载辅助动力AIRBORNE AUXILIARY POWER(77)

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A.  This section covers the removal and installation of the cooling fan while the APU is installed on the aircraft. It is necessary to lower APU and remove cooling duct in order to gain access to cooling fan for removal and installation.
2.  Prepare to Remove Cooling Fan (Figure 401)
A.  Position BATTERY SWITCH and APU START SWITCH to OFF and placard that APU maintenance is "in work."
B.  Open the circuit breaker on M280 module-APU accessory unit on E3-3 electronic shelf.
C.  Open APU compartment access door latches and open door. Install door support rods.
D.  Support lower shroud, open shroud latches, and remove shroud.
CAUTION:  EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
E.  Lower APU enough to gain access for removal of cooling fan. Refer to 49-11-0, pages 401-403.
F.  Remove cooling duct (110) as follows:
(1)  
Remove fire loop brackets from duct (110).

(2)  
Remove nut (40) and washer (50).

(3)  
Remove clamps (120, 130), gaskets (140, 150) and cooling duct (110).

3.  Remove Cooling Fan (Figure 401)
CAUTION:  BACK FAN ASSEMBLY SLOWLY OUT OF GEARCASE ASSEMBLY IN A STRAIGHT LINE SO AS NOT TO DAMAGE EXTERNAL FAN ASSEMBLY SPLINES OR INTERNAL GEARCASE SPLINES.
A.  Loosen oil tube fitting at bottom of fan (280). Remove bolts (290), washers (300) and carefully back fan assembly (280) out of accessory drive gearcase assembly. Remove and discard packings (310).
4.  Install Cooling Fan (Figure 401)
CAUTION:  PROTECT PACKINGS AS FAN ASSEMBLY IS INSERTED INTO GEARCASE ASSEMBLY.
A.  Apply a thin film of engine oil to packings (310).
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May 01/98  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-51-11 Page 401 

B.  Install new packings (310) on fan assembly (280), then install fan assembly by inserting into gearcase assembly in a straight line so that internal and external splines mesh properly and are not damaged.
C.  Insert fan assembly (280) and attach loosely oil tube fitting to fan. Coat threads of bolts (290) with engine oil. Install washers (300) and bolts (290) and secure fan assembly (280) to gearcase assembly. Tighten bolts to a torque value of 50 to 70 inch-pounds. Tighten oil tube fitting.
5.  Restore Airplane to Normal Configuration (Figure 401)
A.  Install cooling duct (110) as follows:
(1)  
Position cooling duct (110) between fan assembly and oil cooler (160) and secure with gaskets (140, 150) and clamps (120, 130).

(2)  
Install washer (50) and nut (40).

(3)  
Install fire loop brackets to duct (110).

B.  Hoist APU in position according to 49-11-0, pages 403-408.
C.  Position lower shroud against upper shroud and close shroud latches.
CAUTION:  MAINTAIN A MINIMUM CLEARANCE OF 0.18 INCH BETWEEN ENGINE PLUMBING, FIRE DETECTOR, CLAMPS AND INSIDE SURFACE OF LOWER SHROUD.
EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
D.  Disengage APU access door support rods and stow rods. Close and latch access door.
E.  Close the circuit breaker on M280 module-APU accessory unit on E3-3 electronic shelf.
F.  Position BATTERY SWITCH to ON and remove placards.
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49-51-11 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/98 

H32102
500  APU Cooling Fan, Removal/Installation 
May 01/98  Figure 401  49-51-11 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

COOLING AIR SHUTOFF VALVE - REMOVAL/INSTALLATION
1. General
A.  This section covers the removal and installation of the cooling air shutoff valve located on the APU upper shroud assembly. Removal of the valve is through an enlarged rectangular opening in the horizontal web (torque box) above the APU upper shroud. Access to the cooling air shutoff valve is through access door 3701, just forward of the APU compartment.
2.  Prepare To Remove Cooling Air Shutoff Valve
A.  Position horizontal stabilizer trim in full up position (airplane nose down).
B.  Open stabilizer trim control circuit breaker on P6 panel and placard that APU maintenance is "in-work".
C.  Position BATTERY SWITCH and APU START SWITCH to OFF and placard that APU maintenance is "in-work".
D.  Open circuit breaker on M280 module - APU accessory unit on E3-3 electrical shelf.
E.  Gain access to horizontal stabilizer jackscrew compartment.
3.  Remove Cooling Air Shutoff Valve
　
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