52-34-06
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ú 01 Page 405
ú Feb 15/98
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747-400 MAINTENANCE MANUAL
(2) AFT CARGO DOOR;
Refer to the table that follows:
~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 5 |Adapter | 52-34-06 | 02 | 530 | | | 6 |Clamp | | | 445 | | | 7 |Bellcrank | | | 510 | | | 8 |Clamp | | | 445 | | | 9 |Clamp | | | 390 | | | 13 |Torque Tube | | | 470 | | | 16 |Actuator (Latch Actuator) | | | 590 | | | 21 |Bolt (Mounting Bolt) | | | 535 | | | 22 |Washer | | | 550 | | | 23 |Nut | | | 555 | | | 24 |Nut | | | 465 | | | 25 |Washer | | | 460 | | | 26 |Nut | | | 410 | | | 27 |Washer | | | 405 | | | 28 |Washer | | | 400 | | | 29 |Bolt | | | 395 | | | 30 |Bolt | | | 450 | | | 31 |Washer | | | 455 | 2......…........…...................................…..........…......…........1
D. References
(1)
12-21-04/301, Doors
(2)
20-22-01/601, Electrical Bonding
(3)
52-34-00/501, Forward/Aft Cargo Door
(4)
CMM 52-34-11 (Forward Cargo Door)
(5)
CMM 52-35-11 (Aft Cargo Door)
(6)
SSM 52-34-01, 52-35-01
(7)
WDM 52-34-11, 52-35-11
E.
Access
(1)
Location Zone 122 Forward Cargo Container Compartment, Forward Half 142 Aft Cargo Container Compartment
(2)
Access Panel
821R Door - Forward Cargo Compartment
822R Door - Aft Cargo Compartment
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400 MAINTENANCE MANUAL
F. Procedure
S 014-022
(1) Disconnect the pushrods (12), (18), and (19) from the bellcranks (Fig. 401).
NOTE: The pushrod (14) was disconnected during the removal of the
____
latch actuator.
S 724-023
(2)
Examine the torque necessary to turn each lower latch through its full range of motion.
S 644-025
(3)
If the torque is more than 55 pound-inches, clean and lubricate the lower latches (Ref 12-21-04/301).
S 354-026
(4)
If the torque is more than 55 pound-inches after you lubricate the lower latches, rework the latches per CMM 52-34-11 (Forward Cargo Door) or CMM 52-35-11 (Aft Cargo Door).
S 414-024
(5)
Connect the pushrods (12), (18), and (19) to the bellcranks.
NOTE: Pushrod (14) will be connected after the latch actuator is
____
installed.
S 824-033
CAUTION: USE A TORQUE WRENCH WITH A DIAL INDICATOR TO FIND WHEN THE
_______ ACTUATOR INTERNAL STOPS ARE AGAINTS EACH OTHER. DO NOT USE MORE THAN 25 POUND-INCHES OF TORQUE. IF YOU USE MORE THAN 25 POUND-INCHES, YOU CAN CAUSE INTERNAL DAMAGE TO THE LATCH ACTUATOR.
(6)
Do these steps to set the latch actuator in the rigged open position:
(a)
Manually turn the latch actuator counterclockwise to the open position.
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747-400 MAINTENANCE MANUAL
(b) Measure the torque. When the torque increases by 15-20
pound-inches, the internal steps are against each other.
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