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 cowl structure.
NOTE: The axis of the main tube of the pivot support
____ assembly (5) must be vertical, or 90-degrees, to the surface of the cowl structure. 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 cowl structure. 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 485-019-N00
(4) 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 door.
S 415-020-N00
(5) Close the latch (1) that you will examine on the pressure relief door.
(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 door.
(c)
Move the screwdriver in the opposite direction to lock the latch (1).
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(d) If the pressure relief panel has more than one latch, do not lock the opposite latch.
NOTE: The opposite latch must stay unlocked during the test.
____
S 725-021-N00
(6) Do the test of the latches on the pressure relief door.
CAUTION: PUT A FOLDED SHOP CLOTH OR RUBBER MAT BETWEEN THE TORQUE
_______ WRENCH HANDLE AND THE PRESSURE RELIEF DOOR (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 DOOR 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 door.
(b)
With the handle of the torque wrench parallel to the surface of the pressure relief door, turn the handle down smoothly.
(c)
As you turn the handle down, make a record of the torque when the latch on the pressure relief door opens.
(d)
For the fan cowl panel, the latch on the pressure relief door is serviceable if the torque used to open it is 100-130 pound-inches (11.3-14.7 newton-meters).
NOTE: The force necessary to open the latch is 50-65 pounds
____ (22.7-29.5 kilograms). But, the arm of the pivot support assembly which pulls up on the latch decreases the applied force by a factor of two. This makes it necessary to increase the force you apply by a factor of two. Thus, the latch must unlock when the torque wrench shows 100-130 pound-inches (11.3-14.7 newton-meters).
(e) For the core cowl panel, the latch on the pressure relief door is serviceable if the torque used to open it is 160-190 pound-inches (18.0-21.5 newton-meters).
NOTE: The force necessary to open the latch is 80-95 pounds
____ (36.3-43.1 kilograms). But, the arm of the pivot support assembly which pulls up on the latch decreases the applied force by a factor of two. This makes it necessary to increase the force you apply by a factor of two. Thus, the latch must unlock when the torque wrench shows 160-190 pound-inches (18.0-21-5 newton-meters).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
71-11-08
ALL ú ú N01 Page 506 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 025-022-N00
(7)
If the force to release the latch (1) is not in the specified limits, replace the latch.
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