2)  If the wear or damage is more than the limits, specified by SRM 54-30-90, replace the tension latch (AMM 78-31-04/401).
 S 216-007-N00
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (6)  
Close the thrust reversers (AMM 78-31-00/201).

 (7)  
Close the core cowl panels (AMM 71-11-06/201).

 (8)  
Close the fan cowl panels (AMM 71-11-04/201).

 S 866-008-N00
 S 866-009-N00
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 78-31-04
 ALL  ú ú N01 Page 602 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
THRUST REVERSER COWL OPENING POWER UNIT - REMOVAL/INSTALLATION
______________________________________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task removes the cowl opening power unit for the thrust reversers. The second task installs the cowl opening power unit.
 B.  The cowl opening power unit is referred to as the power unit for this procedure.
 TASK 78-31-05-004-001-N00
 2.  Remove the Power Unit
_____________________
 A.  References
 (1)
AMM 24-22-00/201, Electrical Power - Control

 (2)
AMM 27-62-00/201, Speed Brake Control System

 (3)
AMM 54-62-04/401, Nacelle Strut Access Panels

 (4)
AMM 71-11-04/201, Fan Cowl Panels

 (5)
AMM 71-11-06/201, Core Cowl Panels

 (6)
AMM 78-31-00/201, Thrust Reverser System

 (7)
AMM 78-31-08/401, Thrust Reverser Opening Flex Hoses

 (8)
IPC 78-31-06, Fig. 5

 B.  
Access

 (1)  
Location Zones 415 and 416 Engine 1 - Thrust Reverser Halves 425 and 426 Engine 2 - Thrust Reverser Halves 435 and 436 Engine 3 - Thrust Reverser Halves 445 and 446 Engine 4 - Thrust Reverser Halves

 (2)  
Access Panels 413 and 414 Fan Cowl Panels - Engine 1 417 and 418 Core Cowl Panels - Engine 1 423 and 424 Fan Cowl Panels - Engine 2 427 and 428 Core Cowl Panels - Engine 2 433 and 434 Fan Cowl Panels - Engine 3 437 and 438 Core Cowl Panels - Engine 3 443 and 444 Fan Cowl Panels - Engine 4 447 and 448 Core Cowl Panels - Engine 4 451A No. 2 Forward Fairing - Engine 1 461A No. 2 Forward Fairing - Engine 2 471A No. 2 Forward Fairing - Engine 3 481A No. 2 Forward Fairing - Engine 4

 C.  
Prepare to Remove the Power Unit

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. THRUST REVERSERS WITH COWL OPENING POWER ú

 78-31-05
 UNITS  ú
 ú N01 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 401Oct 10/95 

////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 044-002-N00
 WARNING: DO THE DEACTIVATION PROCEDURE TO PREVENT THE OPERATION OF THE
_______ THRUST REVERSER. THE 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 014-003-N00

 (2)  
Remove the forward strut fairing (AMM 54-62-04/401).

 S 014-026-N00

 (3)  
Access the L (R) Main Equipment Center, E1 (E2)

 S 864-027-N00

 (4)  
For the applicable engine(s), open these circuit breakers and attach the DO-NOT-CLOSE tags:

 (a)  
On the left Power Distribution Panel, P414:
 1) 414D19, ENG 1 COWL DOOR CONTROL
 2) 414E16, ENG 1 COWL DOOR POWER UNIT
 3) 414D20, ENG 2 COWL DOOR CONTROL
 4) 414A16, ENG 2 COWL DOOR POWER UNIT

 (b)  
On the right Power Distribution Panel, P415:
 1) 415E15, ENG 3 COWL DOOR CONTROL
 2) 415E19, ENG 3 COWL DOOR POWER UNIT
 3) 415E16, ENG 4 COWL DOOR CONTROL
 4) 415E22, ENG 4 COWL DOOR POWER UNIT

 D.
　
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