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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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