A72338
Low Pressure Fuel Filter Installation 597
49-31-21Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/92
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.
C. Close the circuit breaker on M280 module-APU accessory unit on E3-3 electronic shelf.
D. Position BATTERY SWITCH to ON and remove placards.
597
Oct 20/92 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-31-21 Page 403
FUEL SOLENOID VALVE - REMOVAL/INSTALLATION
1. Prepare for Fuel Solenoid Valve Removal
A. Position BATTERY switch and APU master switch to OFF and placard that APU maintenance is "in work."
B. Open the circuit breaker on M280 module-APU control unit on E3-3 electronic shelf.
C. Open APU compartment access door latches and open access 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.
2. Remove Fuel Solenoid Valve
A. Place suitable container under solenoid valve to catch dripping fuel.
B. Disconnect electrical plug from solenoid valve (Fig. 401).
C. Disconnect high pressure fuel line from fitting on fuel control unit and from fitting on solenoid valve and remove line.
D. Disconnect high pressure fuel line from elbow on solenoid valve.
E. Supporting solenoid valve, remove attaching screws and washers and remove valve.
3. Install Fuel Solenoid Valve
A. Position solenoid valve on fuel control unit housing and install attaching screws with washers (Fig. 401).
B. Connect high pressure fuel line to elbow on solenoid valve.
C. Install high pressure fuel line to fitting on solenoid valve and to fitting on fuel control unit.
D. Connect solenoid valve electrical plug and safety wire.
E. Safety wire solenoid valve attaching screws.
F. APUs WITH ALLIEDSIGNAL SB GTCP85-49-7096; examine the fuel solenoid valve for leakage:
(1)
Start and operate the APU (AMM 49-11-0/201).
(2)
During the APU operation, examine the fuel solenoid valve 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)
Open the circuit breaker on M280 module - APU control unit on E3-3 electronic shelf.
(6)
If you found leakage, repair the cause of it.
G. APUs WITHOUT ALLIEDSIGNAL SB GTCP85-49-7096; examine the fuel solenoid valve 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)
Open the circuit breaker on M280 module - APU control unit on E3-3 electronic shelf.
(5)
Visually examine the fuel solenoid valve for any signs of leakage:
(a) If you found signs of leakage, repair the cause of it.
504
Feb 01/96 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-31-31 Page 401
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