S 734-025-N00

 (12)
 Do this task:  Test No. 14, PT2/TT2 System Leak Check (AMM 71-00-00/501).

 S 414-020-N00

 (13)
 Close the fan cowl panels (AMM 71-11-04/201) or install the fan cowl panels (AMM 71-11-04/401).

 S 944-019-N00
 CAUTION: DURING THE INLET COWL INSTALLATION, KEEP THE TOOLS AND OTHER
_______ OBJECTS OUT OF THE AIR INLET. UNWANTED MATERIAL CAN CAUSE DAMAGE IF IT GOES INTO THE ENGINE.
 (14)
 Make sure no tools or other objects are in the inlet cowl.

 S 864-021-N00

 (15)
 For the applicable engine, remove the DO-NOT-CLOSE tag and close this circuit breaker:

 (a)  P6 Main Power Distribution Panel
 1) 6H19 PROBE HEAT ENG 1
 2) 6H21 PROBE HEAT ENG 2
 3) 6H23 PROBE HEAT ENG 3
 4) 6H25 PROBE HEAT ENG 4

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 71-11-01
 ALL  ú ú N01 Page 412 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
INLET COWL PRESSURE RELIEF VENT - REMOVAL/INSTALLATION
______________________________________________________
 1.  General
_______
 A.  Two tasks are given in this procedure. The first task is the removal of the pressure relief vent on the inlet cowl. The second task is the installation of the pressure relief vent on the inlet cowl.
 B.  The pressure relief vent is installed on the lower aft edge of the inlet cowl.
 TASK 71-11-03-004-001-N00
 2.  Remove the Inlet Cowl Pressure Relief Vent (Fig. 401)
__________________________________________
 A.  References
 (1)  
IPC 71-11-01-01

 B.  
Access

 (1)  
Location Zone
 411 Engine 1 - Inlet Cowl
 421 Engine 2 - Inlet Cowl
 431 Engine 3 - Inlet Cowl
 441 Engine 4 - Inlet Cowl

 C.  
Procedure

 S 034-002-N00
 (1)  
Put a screwdriver in the latch tool slots.

 S 034-015-N00

 (2)  
Apply a force to the screwdriver to release the latches.

 S 034-003-N00

 (3)  
Remove the bolts from the hinge assemblies on the vent.

 S 024-004-N00

 (4)  
Use a drift punch on the outer side of the vent to push the roll pins until the vent is free.

 S 034-005-N00

 (5)  
Remove the hinge assemblies and the washers.

 S 034-006-N00

 (6)  
Remove the bushings if they are worn.

 TASK 71-11-03-404-007-N00
 3.  Install the Inlet Cowl Pressure Relief Vent (Fig. 401)
___________________________________________
 A.  Consumable Materials
 (1)  
A00247 Sealant - BMS 5-95 (AMM 20-30-01)

 B.  
References

 (1)  
AMM 71-11-03/501, Cowl Panel Pressure Relief Vent

 (2)  
IPC 71-11-01-01

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 71-11-03
 ALL  ú ú N01 Page 401 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////

(IF IT IS NECESSARY)
HINGE ASSEMBLY
(2 LOCATIONS)
A-A

Inlet Cowl Pressure Relief Vent Installation
Figure 401

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 71-11-03
 ALL  ú ú N01 Page 402 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C. Access
 (1)  
Location Zone
 411 Engine 1 - Inlet Cowl
 421 Engine 2 - Inlet Cowl
 431 Engine 3 - Inlet Cowl
 441 Engine 4 - Inlet Cowl

 D.
Procedure

 S 434-008-N00
　
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