S 825-017-N00

 (13)
 If the load necessary to close the latch is not 40-60 pounds (178-267 Newtons), adjust the load on the latch again.

 S 825-018-N00

 (14)
 With all latches closed, make sure the force necessary to close the aft latch for the thrust reverser is 40-60 pounds (178-267 Newtons).

 (a)  If the load necessary to close the latch is not in the limits, adjust the latches (AMM 78-31-04/501).
 S 445-020-N00
 (15) Do the activation procedure for the thrust reverser (AMM 78-31-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
COWL PANEL PRESSURE RELIEF DOORS - REMOVAL/INSTALLATION
_______________________________________________________
 1.  General
_______
 A.  There are two tasks in this procedure. The first task is the removal of
 the pressure relief doors on the engine cowls. The second task is the
 installation of the pressure relief doors on the engine cowls.

 B.  There are five pressure relief doors on each engine. There is one door
 on the left fan cowl at the 7:30 o'clock position. There are four doors
 on the core cowls at the 3:30, the 5:00, the 7:00, and the 8:30 o'clock
 positions. This procedure is used for the removal and the installation
 of all of the pressure relief doors.

 TASK 71-11-08-004-001-N00
 2.  Pressure Relief Door Removal (Fig. 401)
____________________________
 A.  References
 (1)  
AMM 78-31-00/201, Thrust Reverser System

 (2)  
IPC 71-11-08 Fig. 1

 B.  
Access

 (1)  
Location Zone
 413 and 414 Fan Cowl Panel - Engine 1
 423 and 424 Fan Cowl Panel - Engine 2
 433 and 434 Fan Cowl Panel - Engine 3
 443 and 444 Fan Cowl Panel - Engine 4
 417 and 418 Core Cowl Panel - Engine 1
 427 and 428 Core Cowl Panel - Engine 2
 437 and 438 Core Cowl Panel - Engine 3
 447 and 448 Core Cowl Panel - Engine 4

 C.  
Procedure

 S 044-002-N00
 WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT THE
_______ OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Do this procedure: Thrust Reverser Deactivation for Ground
 Maintenance (AMM 78-31-00/201).

 S 034-003-N00

 (2)  
Release the latches on the pressure relief door.

 (a)  
Put a screwdriver in the latch slot.

 (b)  
Apply a force on the screwdriver until the latch releases.

 S 034-018-N00
 (3)  
Remove the bolts, nuts, and washers from the hinge assemblies on the door.

 S 034-004-N00

 (4)  
Push the roll pins with a drift punch on the outer side of the door until the door is free.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////

FAN COWL PANEL
LATCH TOOL SLOT
CORE COWL PANEL PRESSURE RELIEF DOOR (4 LOCATIONS)
B Cowl Panel Pressure Relief Door Installation Figure 401 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 71-11-08
 ALL  ú ú N01 Page 402 ú Jun 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.

CROSS SECTION OF THE HINGE ASSEMBLYA-A
Cowl Panel Pressure Relief Door Installation Figure 401 (Sheet 2)
　
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