(a)  
P6-2 Main Power Distribution Panel
 1) 6K18, APU ALTN CONT

 (b)  
P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU PRIME CONT

 S 864-017
 (2)  
Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 overhead panel.

 S 414-022

 (3)  
Close the left APU access door, 317AL, and right APU access door, 318AR:

 (a)  
Remove the two quick-release pins, disconnect the two hold-open rods and put the two hold-open rods in the two clips on the right access door.

 (b)  
Install the two quick-release pins in the two brackets on the right APU compartment bulkhead.

 (c)  
Lift the right access door until you can install the lanyard on the pin at the aft APU compartment bulkhead.

 NOTE: The lanyard will hold the right access door on the APU
____
 compartment bulkhead.

 (d)  
Remove the two quick-release pins, disconnect the two hold-open rods and put the two hold-open rods in the two clips on the left access door.

 (e)  
Install the two quick-release pins in the two brackets on the left APU compartment bulkhead.

 (f)  
Make sure the insulation covers are correctly attach to the APU compartment firewall.

 (g)  
Lift the left access door until the two APU access doors are approximately aligned.

 (h)  
Close the two APU access doors.

 (i)  
Close the six latches on the right access door.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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A
747-400 MAINTENANCE MANUAL
 IGNITER PLUG - INSPECTION/CHECK
_______________________________
 1.  General_______
 A. This procedure has the task to inspect the igniter plug.
 TASK 49-41-04-206-001
 2.  Igniter Plug Inspection (Fig. 601)_______________________
 A. References
 (1)  
AMM 49-41-04/401, Igniter Plug

 B.
Access

 (1)  
Location Zones 221 Control Cabin - Left 222 Control Cabin - Right 310 Fuselage - Station 2360 to Station 2792

 (2)  
Access Panels
 317AL APU Access Door - Left
 318AR APU Access Door - Right

 C.
Procedure

 S 026-007
 (1)  
Do this task: Igniter Plug Removal (AMM 49-41-04/401).

 S 216-004

 (2)
Inspect the center electrode and nose of the igniter plug:

 (a)  
Replace the igniter plug if erosion wear in the center electrode and nose of the igniter plug is more than 0.30 inch

 (7.62 mm).
 (b)  Replace the igniter plug if the nose fretting is more than
 0.025 inch (0.64 mm) in depth.
 S 426-008
 (3) Do this task: Igniter Plug Installation (AMM 49-41-04/401).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

B B

NEW IGNITER PLUG A-A A-A
EROSION LIMIT A-A

B-B

Igniter Plug Inspection
Figure 601

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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 ALL  ú ú 01 Page 602 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 IGNITER PLUG - CLEANING/PAINTING
________________________________
 1. General
_______
 A. This procedure has the task to clean the igniter plug.
 TASK 49-41-04-107-001
　
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