(3)  
AMM 78-31-00/201, Thrust Reverser System

 D.  Access
 (1)  
Location Zones 412 Engine 1 - Diffuser/Combustor, 4 or 5 o'clock 422 Engine 2 - Diffuser/Combustor, 4 or 5 o'clock 432 Engine 3 - Diffuser/Combustor, 4 or 5 o'clock 442 Engine 4 - Diffuser/Combustor, 4 or 5 o'clock

 (2)  
Access Panels
 418 Engine 1 - Core Cowel Panel (Right)
 428 Engine 2 - Core Cowel Panel (Right)
 438 Engine 3 - Core Cowel Panel (Right)
 448 Engine 4 - Core Cowel Panel (Right)

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
E. Procedure
 S 048-014-N00
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE THRUST REVERSER TO
_______ PREVENT THE OPERATION OF THE THRUST REVERSER. ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  
Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).

 S 018-002-N00

 (2)  
Open the right core cowl panel (AMM 71-11-06/201).

 S 018-003-N00

 (3)  
Remove the igniter plug (AMM 74-21-02/401).

 S 358-016-N00

 (4)  
Do the repair for the igniter plug guide.

 (a)  Remove the igniter plug boss, spacers and keywasher. 1) Measure the dimension A of the igniter plug boss, spacers
 and keywasher that you removed (Fig. 801). 2) Keep the igniter plug boss.
 NOTE: The igniter plug boss can be used again when the
____ igniter plug guide and boss assembly is removed and a new igniter plug guide is installed.
 3) Discard the keywasher.
 (b)  Use one or two classified spacers (Table 801) on the new igniter plug boss and guide assembly and keywasher that will make sure the new dimension A is the same as the dimension A you measured.
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SEE  A 
DIFFUSER CASE 
BOSS AND GUIDE ASSEMBLY INSTALL THEM WITH THE KEEP THE SPACERS TO  REMOVE THE BOSS BSEE KEY WASHER REMOVE THE 
ASSEMBLY BOSS AND GUIDE 
DIMENSION A  IGNITER PLUG
WITH A NEW KEY WASHER AND GUIDE ASSEMBLY INSTALL THE BOSS 
B 
A 

Igniter Plug Guide Repair
Figure 801

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E69168
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
~............................................................. | | Spacer Thickness | | Classified Spacer ........................................... | Part Number | Inches | Millimeters | ............................................................... | 741073 CL 1 | 0.008 - 0.018 | 0.20 - 0.46 | | 741073 CL 2 | 0.018 - 0.028 | 0.46 - 0.71 | | 741073 CL 3 | 0.028 - 0.038 | 0.71 - 0.97 | | 741073 CL 4 | 0.038 - 0.048 | 0.97 - 1.22 | | 741073 CL 5 | 0.048 - 0.058 | 1.22 - 1.47 | | 741073 CL 6 | 0.058 - 0.068 | 1.47 - 1.73 | | 741073 CL 7 | 0.068 - 0.078 | 1.73 - 1.98 | | 741073 CL 8 | 0.078 - 0.088 | 1.98 - 2.24 | | 741073 CL 9 | 0.088 - 0.098 | 2.24 - 2.49 | | 741073 CL 10 | 0.098 - 0.108 | 2.49 - 2.74 | | 741073 CL 11 | 0.108 - 0.118 | 2.74 - 3.00 | | 741073 CL 12 | 0.118 - 0.128 | 3.00 - 3.25 | | 741073 CL 13 | 0.128 - 0.138 | 3.25 - 3.51 | | 741073 CL 14 | 0.138 - 0.148 | 3.51 - 3.76 | | 741073 CL 15 | 0.148 - 0.158 | 3.76 - 4.01 | | 741073 CL 16 | 0.158 - 0.168 | 4.01 - 4.27 | | 741073 CL 17 | 0.168 - 0.178 | 4.27 - 4.52 | | 741073 CL 18 | 0.178 - 0.188 | 4.52 - 4.78 | 2...................….....................…...................1
　
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