B.
References
(1)
AMM 52-31-00/201, Nose Cargo Door
C.
Access
(1)
Location Zone
801 Nose Cargo Door
D.
Procedure
S 866-030
(1)
Open the nose cargo door (AMM 52-31-00/201).
S 216-031
(2)
Do an examination of the latches for the nose cargo door.
(a)
Look for debris.
(b)
Look for corrosion.
(c)
Look for damage.
(d)
Look for chafed or damaged wires.
(e)
Look for loose or missing fasteners.
(f)
See that the latches and the latch fittings are securely attached to the structure.
S 866-032
(3) Close the nose cargo door (AMM 52-31-00/201).
TASK 52-31-00-726-033
5. Nose Cargo Door System Sequence Check (Fig._____________________________________601)
A. Access
(1)
Location Zone
801 Nose Cargo Door
B.
Procedure
(1)
Fully close latch and lock the nose cargo door.
S 726-037
(2)
Do a check of the rigging of the cargo door.
(a)
Make sure the end of each linear actuator shaft covers the inspection hole 1/4 to 3/4 inch (Detail A, Fig. 601).
(b)
Make sure you can turn the cam rollers (Detail B) freely with your hand.
S 866-034
NOTE: The cam rollers turn freely if it does not contact
____
the cam.
(c) Make sure the EICAS message DOOR NOSE CARGO does not show.
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MAINTENANCE MANUAL
S 726-038
(3) Do an operational check for the latch, push-pull cam and lift mechanisms.
NOTE: The purpose of this check is to make sure that the latch,
____ push-pull cam and lift mechanisms operate in sequence. The limit switches stop the operation of one mechanism and start the operation of the next mechanism. Therefore, if a mechanism does not operate completely, it can cause the next mechanism to stop.
(a)
Electrically open the nose cargo door a minimum of 24 inches at the bottom.
(b)
Make sure the latch, push-pull cam and lift mechanisms operate in sequence.
S 726-039
(4)
Do an operational check for the latch actuators.
(a)
Electrically close and latch the nose cargo door.
(b)
Listen for unusual sounds and other evidence of high operating loads at the latch actuators as latches close.
NOTE: When the door opens or closes it can make unusual noise
____ when the latch pins engage the spherical bearings.
CAUTION: DO NOT CRANK THE LATCH ACTUATOR MORE THAN 8 POUND-FEET.
_______
THIS CAN CAUSE DAMAGE TO THE MANUAL DRIVE INPUT.
(c) See that no more than 20 pound-inches is necessary to manually crank each of the 16 latch actuators in the retract direction.
S 726-040
(5) With all the latch pins retracted, electrically close and latch the nose cargo door.
NOTE: When the door opens or closes it can make unusual noise when
____
the latch pins engage the spherical bearings.
(a) Hold the switches in the closed position approximately 5 seconds after all electrical operation stopped.
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747-400 MAINTENANCE MANUAL
S 726-041
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