D. Tighten clamp nut of clamp attaching combustor unit to turbine plenum to a torque range of 50 to 70 pound-inches.
(1)
Tap clamp around circumference of the band with a non-metallic hammer to make sure clamp is seated correctly.
(2)
Torque nut 50 to 70 pound-inches.
NOTE: Continue to alternately torque and tap until the torque remains between 50 and 70 pound-inches.
NOTE: If atomizer was removed for overhaul or line maintenance, check to ensure that atomizer bolts are torqued to 20 to 25 pound-inches and lockwired.
E. Connect high voltage lead to igniter plug.
F. Lockwire igniter plug mounting bolts and high voltage lead terminal.
G. Connect fuel drain line to combustion chamber cap.
H. Perform plenum drain check (AMM 49-31-71/601).
CAUTION: BEFORE CONNECTING FUEL DRAIN LINE TO COMBUSTION CAP, BE SURE TO PERFORM PLENUM DRAIN CHECK TO ENSURE DRAIN IS NOT BLOCKED BY FOREIGN OBJECTS.
I. APUs WITH ALLIEDSIGNAL SB GTCP85-49-7096; examine the combustor unit for leakage:
(1)
Start and operate the APU (AMM 49-11-0/201).
(2)
During the APU operation, examine the combustor unit for air or fuel 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.
J. APUs WITHOUT ALLIEDSIGNAL SB GTCP85-49-7096; examine the combustor unit 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 combustor unit for any signs of air or fuel leakage:
(a) If you found signs of leakage, repair the cause of it.
5. Restore Airplane to Normal Configuration
A. Clean APU shroud drains (AMM 49-12-0/701).
B. 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.
CAUTION: BEFORE INSTALLING LOWER SHROUD, BE SURE TO CLEAN APU SHROUD DRAINS TO ENSURE DRAINS ARE NOT BLOCKED BY FOREIGN OBJECTS.
CAUTION: EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
C. Disengage APU compartment access door support rods and stow rods. Close and latch access door.
D. Close the circuit breaker on M280 module-APU control unit on E3-3 electronic shelf and remove placards.
504
49-31-42 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/99
G39852
501 Combustor Unit Installation
Apr 01/97 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-31-42 Page 403
FUEL HEATER - REMOVAL/INSTALLATION
1. Prepare to Remove Fuel Heater
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. Remove APU power plant (Ref 49-11-0, Removal/Installation).
2. Remove Fuel Heater (Fig. 401)
A. Disconnect all plumbing from fuel heater.
B. Remove screws and washers securing clamps to shroud, and remove clamps, heater, and spacers.
C. If required to remove fuel heater check valve, proceed as follows:
(1)
Disconnect plumbing from check valve if still installed in shroud.
(2)
Remove check valve from heater.
(3)
Remove and discard packing.
3. Install Fuel Heater (Fig. 401)
A. If check valve was removed, insert new packing and install on plumbing with arrow directed at fuel heater.
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