S 822-026
(5) Do the procedure to adjust the door flushness (AMM 54-62-03/501), if it is necessary.
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747-400 MAINTENANCE MANUAL
NACELLE STRUT ACCESS DOOR - ADJUSTMENT/TEST
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1. General_______
A. This procedure has three tasks. The first task performs a functional check of the nacelle strut pressure relief door latch. The second task is an adjustment of the nacelle strut pressure relief door latch. The third task is a functional check of the pressure relief door on the trailing edge (TE) fairing.
B. The latch check consists of measuring load required to release door, comparing with the required load, and replacing door or latch if not within limits.
C. Pressure relief door latches are designed to release the door when an outward force from internal pressure buildup due to a malfunction. The latch test procedure is provided to ensure the pressure relief latches will release within the proper limits.
(1) For the nacelle strut, the pressure relief door latches are designed to release when the internal pressure buildup reaches 50 to 65 pounds.
(a)
To perform the release check procedure, you will operate the latch with a torque adapter and pivot support assembly and note the torque required to release the latch. (Fig. 501 Sh. 6).
(b)
If you use the alternative procedure, you will operate the latch with a torque adapter and then change the torque that you measured into the force that is necessary to release the latch. (Fig. 501 sh. 5) 1) You will then change the force that you measured into the
force necessary to release the latch.
(2) For the trailing edge (TE) fairing, the pressure relief door latches are designed to release when the internal pressure buildup reaches 90 to 110 pounds.
(a)
One procedure is for the pressure relief doors with the four (stud and clip) fasteners.
(b)
A separate procedure is for the spring loaded pressure relief doors. You will operate the latch with a torque adapter and pivot support assembly. You will then measure the torque that is necessary to release the latch.
D. Door adjustment on the nacelle strut consists of checking door looseness, checking gap around door and door flushness, and adding or removing shims, or replacing door, if necessary to bring within limits.
(1) A door flushness adjustment procedure is provided to assure proper fit and aerodynamic smoothness.
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MAINTENANCE MANUAL
(2) Door must be replaced (if not within limits) if door lip or latch is secured with hi-lok bolts and collars. Shims may be added or removed, or latch may be replaced (if not within limits) if door lip or latch is secured with bolts, nuts, and washers.
TASK 54-62-02-725-040
2. Nacelle Strut Pressure Relief Door Latch Test (Fig. 501)
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A. Equipment
(1)
B71044-28 - Adapter and Pivot Support Assembly, Load Test, Pressure Relief Door Latches
(2)
B71044-30 - Torque Adapter, Nacelle Strut Access Door Latches (Alternative)
(3)
Torque Wrench Adapter - 1/4-inch drive to 3/8-inch drive.
B. References
(1)
AMM 54-62-00/201, Nacelle Strut Access Panels
(2)
IPC 54-62-02 Fig. 1 and 4
C. Access
(1) Location Zone
452 Nacelle Strut 1 - Torque Box
454 Nacelle Strut 1 - Aft Fairing
462 Nacelle Strut 2 - Torque Box
464 Nacelle Strut 2 - Aft Fairing
472 Nacelle Strut 3 - Torque Box
474 Nacelle Strut 3 - Aft Fairing
482 Nacelle Strut 4 - Torque Box
484 Nacelle Strut 4 - Aft Fairing
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