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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
FAN COWL 
(REF) 
INLET  HINGE 
COWL  (BEHIND THE VENT, 
2 LOCATIONS) 
VENT 
SEE  A 
A 
A 
COWL PANEL 
INTERIOR 
WASHER FOR THE SIDE  (REF)  SHIM FOR THE 
CLEARANCE ADJUSTMENT  STEP-HEIGHT 
ADJUSTMENT 

VENT  A 
TEST LOAD POINT  A 
B LATCH  SEE B LATCH TOOL SLOT (2 LOCATIONS)  FWD 
+0.025 INCH (+0.64 mm) -0.035 INCH (-0.89 mm)  0.03-0.04 INCH (0.8-1.0 mm) BOLT (2 LOCATIONS) ROLL PIN (2 LOCATIONS)  VENT A 
INLET COWL 
VENT 
SHIM FOR THE STEP-HEIGHT ADJUSTMENT HINGE WASHER (2 LOCATIONS) 
BUSHING  WASHER FOR THE ADJUSTMENT SIDE CLEARANCE  NUT (2 LOCATIONS) 
A-A HINGE ASSEMBLY (2 LOCATIONS) 
Figure 502 Inlet Cowl Pressure Relief Vent Details 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(b)  
Temporarily fasten the adapter assembly (2) to the vent with the bolts (4) that are supplied with the adapter assembly. 1) Put the adapter bolts (4) into the bolt holes that the

 latch bolts (3) were removed from. 2) Tighten the nuts on the bolts (4) with your fingers.

 (c)  
Attach the arm of the pivot support assembly (5) to the adapter assembly (2) with the ring pin (6).

 (d)  
Put the base of the pivot support assembly (5) flush on the surface of the pressure relief vent.

 NOTE: The axis of the main tube of the pivot support
____ assembly (5) must be vertical, or 90-degrees, to the surface of the pressure relief vent. The arm of the pivot support assembly (5), that connects to the adapter assembly (2), also must be 90-degrees to the surface of the pressure relief vent. When you put the tool in this correct position and turn the torque wrench, force will be applied correctly at the centerline of the latch.
 S 485-014-N00
 (3)  Attach the torque wrench to the pivot bolt (7) of the pivot support assembly (5).
 NOTE: Make sure that the handle of the torque wrench is parallel
____
 with the surface of the pressure relief vent.

 S 415-015-N00
 (4)  Close the latch (1) that you will examine on the pressure relief vent.
 (a)  
Put the blade of a straight-slot screwdriver into the slot on the latch (1) that you will examine.

 (b)  
Move the screwdriver handle until the latch (1) is in the fully open position, and close the pressure relief vent.

 (c)  
Move the screwdriver in the opposite direction to lock the latch (1).

 (d)  
Do not lock the opposite latch.

 NOTE: The opposite latch must stay unlocked during the test.
____
 S 725-016-N00
 (5)  Do the test of the latches on the pressure relief vent.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
CAUTION: PUT A FOLDED SHOP CLOTH OR RUBBER MAT BETWEEN THE TORQUE
_______ WRENCH HANDLE AND THE PRESSURE RELIEF VENT (BEFORE YOU TURN THE HANDLE TO OPEN THE LATCH). THIS WILL PREVENT INJURY TO YOUR HAND WHEN YOU SUDDENLY RELEASE THE LATCH. ALSO, IT WILL PREVENT SCRATCHES TO THE SURFACE OF THE PRESSURE RELIEF VENT CAUSED BY THE TORQUE WRENCH HANDLE. IF YOU DO NOT DO THIS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (a)  
Put a folded shop cloth or rubber mat between the torque wrench handle and the pressure relief vent.
　
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