52-31-00
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A
747-400
MAINTENANCE MANUAL
LATCH ACTUATOR
AND FITTING
SEE C LINEAR ACTUATOR SEE A
PUSH-PULL CAM MECHANISM
SEE B AFT END OF LINEAR ACTUATOR SHAFTINSPECTION HOLE
END OF LINEAR ACTUATOR SHAFT TO COVER 1/4 TO 3/4 OF INSPECTION HOLE
LINEAR ACTUATOR
A
Nose Cargo Door System - Inspection/Check
Figure 601 (Sheet 1)
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B26862
A 747-400 MAINTENANCE MANUAL
FITTING CAM SUPPORT PUSH-PULL CAM CAM ROLLER (QTY 2) A
ACTUATOR ROD END
PUSH-PULL CAM ACTUATOR
CAM ROLLER SUPPORT FITTING
A ACTUATOR LENGTH
PUSH-PULL CAM MECHANISM B MANUAL DRIVE INPUT
CAM ACTUATOR LATCH
0.06 |0.02 INCH CAM ROLLER FITTING PORTAL LATCH
INDICATION SWITCH POSITION
ACTUATOR 0.12 |0.02 INCH CAM SUPPORT FITTING
A-A C
Nose Cargo Door System - Inspection/Check
Figure 601 (Sheet 2)
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B26863
A
747-400
MAINTENANCE MANUAL
8R
7R LATCH ACTUATOR
5R 6R 8L A
4R HANDLE LOCK SAFETY 7L FITTING LATCH
2R ASEE 3R (16 LOCATIONS) 1R 3L 4L 5L 6L NUT RETAINING BUSHING RETRACTED) (SHOWN LATCH PIN A
LATCH LOCATIONS 1L 2L A
FITTING LATCH
FITTING DOOR
BUSHING RETAINING NUT
LATCH PIN (SHOWN FULLY PORTAL
LATCHED)
LATCH 1 FITTING
A-A
1 LATCH PIN IS ADEQUATELY EXTENDED IF END OF PIN IS FLUSH WITH LOWER END OF BUSHING RETAINING NUT, WITHIN |0.10 INCH
Nose Cargo Door Latch - Inspection/Check Figure 602
B26866
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747-400
MAINTENANCE MANUAL
S 716-007
(6) Make sure you can turn the cam rollers (Detail B) freely with your hand.
NOTE: The cam rollers turn freely if it does not contact
____
the cam.
S 826-008
(7)
Do these steps if you cannot turn the cam rollers freely:
(a)
If the roller end contacts the center web, adjust the roller support fitting laterally (AMM 52-31-09/401).
(b)
If the roller contacts the bottom or forward face of the cam, do these steps to determine whether the actuator is serviceable or the roller support fitting is not in the correct position: 1) Measure the retracted length of the actuator with nose
cargo door closed (Detail B).
2) Electrically open the nose cargo door approximately 12
inches at the bottom.
3) Measure the extended length of the actuator.
4) Subtract the retracted length from extended length to
determine the length of the actuator stoke. 5) If actuator stroke is more than 4.60 inches, the actuator brake is unserviceable and you must replace the actuator. 6) If actuator stroke is 4.60 inches or less, adjust the roller support fitting and/or actuator rod.
S 866-009
(8)
Fully close, latch and lock the nose cargo door.
(9)
Make sure the EICAS message DOOR NOSE CARGO does not show.
S 816-011
(10)
If the EICAS message DOOR NOSE CARGO shows, do trouble-shooting for the nose cargo door (FIM 52-EICAS MESSAGES).
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