737 AMM 飞机维护手册 机载辅助动力AIRBORNE AUXILIARY POWER(112)

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2.  Prepare to Remove Oil Tank
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.  Drain oil tank. Refer to 49-91-31, Oil Tank - Unit Servicing.
3.  Remove Oil Tank
A.  Disconnect oil cooler outlet line from fitting on oil tank. (See figure 401.)
B.  Disconnect oil pump inlet line from fitting on oil tank.
C.  Disconnect oil level switch electrical plug from receptacle, remove receptacle from bracket, and detach clamps holding wiring sleeve to electrical conduit.
D.  Disconnect turbine bearing cavity vent line from fitting on oil tank.
E.  Disconnect exhaust vent line from fitting on oil tank.
F.  Disconnect oil pump inlet line from oil pump assembly and remove oil pump inlet line to gain access to oil tank support rods.
G.  Remove nuts, washers, and bolts attaching forward support rods to lower left side of accessory gearcase assembly.
Aug 15/72 49-91-31 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

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Oil Tank installation  514 
49-91-31Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/72 

H.  Remove nuts, washers, and bolts attaching aft support rods to lower left side of turbine plenum assembly.
I.  Remove oil tank.
4.  Install Oil Tank (Fig. 401)
A.  Position oil tank forward and aft support rods against lower left side of accessory gearcase and turbine plenum assembly flanges respectively, with oil tank filler port facing the forward direction.
B.  Attach aft support rods to lower left side of turbine plenum assembly flange with bolts, washers, and nuts.
C.  Attach forward support rods to lower left side of accessory gearcase assembly flange with bolts, washers, and nuts.
D.  Tighten forward support rod bolts to a torque of 40 to 45 inch-pounds and tighten aft support rod bolts to a torque of 90 to 110 inch-pounds.
E.  Install oil pump inlet line.
(1)  
Connect one end of oil pump inlet line to fitting on oil pump assembly.

(2)  
Connect other end of oil pump inlet line to fitting on oil tank.

F.  Connect oil cooler outlet line to fitting on oil tank.
G.  Insert oil level switch electrical receptacle in bracket and secure with four sets of screws, washers, and nuts. Connect electrical plug to receptacle.
H.  Clamp wiring sleeve to electrical conduit.
I.  Connect turbine bearing cavity vent line to fitting on oil tank.
J.  Connect exhaust vent line to fitting on oil tank.
K.  Fill oil tank (AMM 49-91-31/301).
L.  Close the circuit breaker on M280 module-APU control unit on E3-3 electronic shelf.
M.  Position BATTERY switch to ON and remove placards.
N.  APUs WITH ALLIEDSIGNAL SB GTCP85-49-7096;
Examine the oil tank for leakage:

(1)  
Start and operate the APU (AMM 49-11-0/201).

(2)  
During the APU operation, examine the oil tank for leakage.

(3)  
Do the APU normal shutdown (AMM 49-11-0/201).

(4)  
Attach a DO-NOT-OPERATE tag to the APU master switch on the P5 forward overhead panel.

(5)  
If you found leakage, repair the cause of it.

O.  APUs WITHOUT ALLIEDSIGNAL SB GTCP85-49-7096;
Examine the oil tank for leakage:

(1)  
Start and operate the APU (AMM 49-11-0/201).

(2)  
Do the APU normal shutdown (AMM 49-11-0/201).

(3)  
Attach a DO-NOT-OPERATE tag to the APU master switch on the P5 forward overhead panel.

(4)  
Visually examine the oil tank for any signs of leakage:

(a)  If you found signs of leakage, repair the cause of it.
Aug 01/95 49-91-31 Page 403 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

5.  Restore Airplane to Normal Configuration
A.  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.
B.  Disengage APU compartment access door support rods and stow rods. Close and latch access door.
　
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