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1.  Prepare for Ignition Unit Removal
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 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 Ignition Unit (See figure 401.)
A.  Disconnect electrical plug and shielded igniter lead from ignition unit.
WARNING:  CURRENT INVOLVED IN IGNITION SYSTEM IS OF VERY HIGH VOLTAGE AND CAN BE FATAL. BE SURE THAT POWER IS REMOVED FROM IGNITION SYSTEM FOR A MINIMUM OF THREE MINUTES BEFORE ANY DISCONNECTIONS ARE MADE. AFTER DISCONNECTING HIGH VOLTAGE LEAD, ENSURE COMPLETE DISCHARGE OF CAPACITORS IN IGNITION UNIT BY IMMEDIATELY SHORTING HIGH VOLTAGE LEAD TERMINAL TO GROUND.
B.  Remove ignition unit mounting screws and washers, and remove unit from support assembly on turbine plenum.
3.  Install Ignition Unit (See figure 401.)
A.  Install ignition unit on rubber pad on support assembly and secure with screws and washers. Tighten bolts to a torque of 20 to 25 pound-inches.
B.  Connect and lockwire electrical plug and shielded igniter lead to ignition unit.
500 
Aug 15/72  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-41-31 Page 401 

G00575
Ignition Unit Installation  500 
49-41-31  Figure 401  Aug 15/72 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

4.  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 circuit breaker on M280 module APU accessory unit on E3-3 electronic shelf.
D.  Remove "APU in work" placard.
E.  Test APU operation (Refer to 49-11-0).
500 
May 01/98  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-41-31 Page 403 

IGNITER PLUG - REMOVAL/INSTALLATION
1.  Prepare for Igniter Plug Removal
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 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 Igniter Plug
A.  Disconnect high voltage lead from igniter plug (Fig. 401).
WARNING:  CURRENT INVOLVED IN IGNITION SYSTEM IS OF VERY HIGH VOLTAGE AND CAN BE FATAL. BE SURE THAT POWER IS REMOVED FROM IGNITION SYSTEM FOR A MINIMUM OF THREE MINUTES BEFORE ANY DISCONNECTIONS ARE MADE. AFTER DISCONNECTING HIGH VOLTAGE LEAD, ENSURE COMPLETE DISCHARGE OF CAPACITORS IN IGNITION UNIT BY IMMEDIATELY SHORTING HIGH VOLTAGE LEAD TERMINAL TO GROUND.
B.  Remove igniter plug mounting bolts and washers.
C.  Withdraw igniter plug from combustion chamber cap.
D.  Remove and discard old gasket.
3.  Install Igniter Plug
A.  Place new gasket on igniter plug (Fig 401).
B.  Insert igniter plug into combustion chamber cap.
C.  Install igniter plug mounting bolts with washers. Tighten nuts to a torque range of 50 to 70 pound-inches.
500 
Nov 15/70  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-41-51 Page 401 

Igniter Plug Installation  500 
49-41-51  Figure 401  Aug 15/72 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

D.  Connect high voltage lead to igniter plug.
E.  Safety wire igniter plug mounting bolts and high voltage lead terminal.
F.  Close the circuit breaker on M280 module-APU accessory unit on E3-3 electronic shelf.
G.  Position BATTERY SWITCH to ON and remove placards.
H.  Test igniter plug operation. Refer to 49-11-0.
　
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