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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
EXTERNAL STOPS EXTERNALCONTACTED AND STOPS
RIGGED CLOSED POSITION

1
(M + 15)
1
MANUAL
DRIVE
TORQUE

1M

-10123  114 116
TURNS OF MANUAL DRIVE TORQUE WRENCH
(

CLOCKWISE TO CLOSE; COUNTERCLOCKWISE TO OPEN
)
LATCH ACTUATOR DIAGRAM
____ THE TURNS ARE THE NUMBER OF TURNS OF A TORQUE WRENCH IN THE MANUAL DIRVE.
NOTE: COUNT THE TURNS AFTER YOU FIND THE INTERNAL STOPS.

1 USE A TORQUE WRENCH TO FIND THE INTERNAL STOPS OF THE ACTUATOR AS FOLLOWS:
1.  
MEASURE THE TORQUE (M) WHILE YOU MANUALLY TURN THE ACTUATOR.
(THE TORQUE SHOULD BE CONSTANT WITHIN |2 POUND-INCHES).

2.  
TURN THE ACTUATOR UNTIL THE TORQUE INCREASES BY 15-20 POUND-INCHES (M + 15).

3.  
TURN THE ACTUATOR 1/2-TURN IN THE OPPOSITE DIRECTION FROM THE (M + 15) POINT.

4.
THE INTERNAL STOPS ARE AT THIS POINT.

2 INITIAL SWITCH SETTING ONLY. SEE TEST FOR FINAL ADJUSTMENT.

Latch Actuator Internal Stop and Rig Positions
Figure 402

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747-400 MAINTENANCE MANUAL
 (b)  Monitor the torque that is applied to the actuator.
 NOTE:____ When the torque increases by 15-20 pound-inches, the
 internal stops are against each other.
 (c)  Turn the torque wrench two turns counterclockwise.
 NOTE:____ This is the rigged closed position.

 S 644-015
 (7)  
Apply grease to the actuator (1), torque tube and coupling splines.

 S 864-016

 (8)  
Engage the aft output spline of the latch actuator (1) in the internal spline of the torque tube.

 S 424-034

 (9)  
Install the latch actuator (1) to the support bracket.

 S 824-035

 (10)
 If the splines do not align, refer to the preliminary splines adjustment below.

 S 414-017

 (11)
 Install the torque tube section (2) as follows:

 (a)  
Put the adapter in its position on the latch actuator spline.

 (b)  
Push the torque tube section (2) in the aft direction through the bearing and align it with the adapter.

 (c)  
Use the stop lever (15) to install the torque tube section (2) to the adapter (View B-B).

 (d)  
If the splines do not align, refer to the initial splines adjustment below.

 S 824-018
 (12)
 If the splines do not align in the above steps, do the initial splines adjustment as follows:

 (a)  
Disconnect the lower latch pushrods (5 locations) and the lower midspan latch pushrods (2 locations).

 (b)  
Install rig pins SCD-3 through the lower latch cams (10 locations).

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747-400 MAINTENANCE MANUAL
 (c)  
Install rig pins SCD-4 through the midspan latch cams (2 locations).

 (d)  
Turn the torque tubes on one of the two sides of the latch actuator as it is necessary to engage the splines of the actuator output shaft with the torque tubes.

 (e)  
Adjust the lower latch pushrods and the lower midspan latch pushrods as it is necessary.

 (f)  
Connect the crank lugs on the pushrod.

 S 864-019
 (13)
 Put the torque tube section (3) in its position and install the clamps.

 S 864-020

 (14)
 Connect the lower latch pushrods to the crank lugs on the torque tube sections.

 S 014-021

 (15)
 Remove rig pins SCD-3 and SCD-4 from the lower latch cams and lower midspan latch cams.
　
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