S 424-012
(2)
For Latch Actuator 7L or 7R,
Do these steps to install the latch actuator:
(a)
Install the latch actuator and filler block on the latch fitting with bolts. 1) Tighten bolts with your hand.
(b)
Install the latch fitting, with the latch actuator attached, on the body frame.
(c)
Make sure the latch fitting align with the index plate.
(d)
Install the attachment bolts, washers, and nuts on the latch fitting with primer BMS 10-11 type I. 1) Make sure the countersunk side of the washer faces the bolt
head.
2) Tighten nut.
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747-400
MAINTENANCE MANUAL
S 434-027
CAUTION: DO NOT CRANK THE LATCH ACTUATOR WITH MORE THAN 8 POUND-FEET
_______ TORQUE. THIS CAN CAUSE DAMAGE TO THE MANUAL DRIVE INPUT.
(3)
Do these steps to tighten the attachment bolts on the latch actuator.
(a)
Manually crank the latch actuator to extend the actuator pin.
NOTE: A small force is necessary to manually crank the latch
____ actuator. If you feel a resistance, the door and body latch fittings can be misaligned or damaged. Do a check for all latch fittings before you crank the latch actuator.
(b)
Tighten the attachment bolts.
(c)
Manually crank the latch actuator to retract the actuator pin.
S 434-014
(4)
Connect the electrical connector to the latch actuator.
S 414-015
(5)
For Latch Actuator 5L or 5R, Install the rain gutter above the actuator.
S 864-016
(6)
Close these circuit breakers and remove the DO-NOT-CLOSE tags:
(a)
On the Auxilary External 2 Power Center-Right panel P715: 1) 715XX, NOSE CARGO DOOR
(b)
On the Power Distribution Center-Right panel P415:
1) 415F16, NOSE CARGO DOOR CONTROL
S 764-017
(7)
Do an electrical system check of the replaced latch actuator, if it is necessary:
(a)
Make sure these circuit breakers are open and attached with the DO-NOT-CLOSE tags: 1) On the Nose Cargo Door Power panel H122:
a) 122XX, DOOR LIFT
b) 122XX, PULL UP CAM
c) 122XX, LATCHES 1-4R
d) 122XX, LATCHES 1-4L
e) 122XX, LATCHES 5-8R
f) 122XX, LATCHES 5-8L
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747-400 MAINTENANCE MANUAL
(b)
Connect a jumper wire between test point TP1 and pin G4 of terminal block TB325 and TP1 and pin X1 of relay R759 in the H122 module.
(c)
Close the applicable LATCHES circuit breaker in H122 module to supply power to the replaced latch actuator and make sure that the actuator latch pin extends.
(d)
Remove the jumper wire from H122 module.
(e)
Operate the door control switches to open the door and make sure that the actuator latch pin retracts fully.
S 864-018
(8)
Close these circuit breakers and remove the DO-NOT-CLOSE tags:
(a)
On the Nose Cargo Door Power panel H122:
1) 122XX, DOOR LIFT
2) 122XX, PULL UP CAM
3) 122XX, LATCHES 1-4R
4) 122XX, LATCHES 1-4L
5) 122XX, LATCHES 5-8R
6) 122XX, LATCHES 5-8L
S 764-019
(9)
If a latch actuator that you replaced has defective internal stops, do a check of the latch actuator electrical system for a shorted diode (Ref 52-31-05/501).
S 864-020
(10)
Fully close and latch the nose cargo door.
S 714-021
(11)
Do an alignment check of latch fittings that you loosened during the latch actuator replacement.
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本文链接地址：747-400 AMM 飞机维护手册 舱门 DOORS 2(46)
