52-11-12
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

UPPER SHAFT
UPPER HINGE ARM UPPER ADJUSTING NUT UPPER SHAFT
LOCKWASHER SEE D
SPACER
BEARING PLATE DOOR STRUCTURE
BEARING PLATE SHAFT COUPLINGS
UPPER AND SPACER
LOCKWASHER
LOWER
ADJUSTING NUT CLAMP
PUSHROD
COCKING  SADDLE 1
(CONNECTED TO CRANK
HANDLE
UPPER COUPLING MECHANISM)
LOWER
SHAFT

LOWER COUPLING FILLER STRIP 1
CLAMP
D
LOWER HINGE ARM
TORQUE TUBE (DOOR 5) 1 IF THERE IS A CRACK IN THE LOWER COUPLING C HALF, TEMPORARILY USE THE CLAMP, CLAMP SADDLE, AND FILLER STRIP TO MAKE THE LOWER COUPLING HALF STRONGER.
Main Entry Door 5 Torque Tube
Figure 201 (Sheet 3)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 932-006
 (2)  
Do this step to make the vertical position mark of the door in the opening:

 (a)  
Put the reference lines at the forward and aft edges of the door and body skins.

 NOTE: You will adjust the door vertically to align these
____ reference lines after you replace the torque tube. If the door does not return to the same vertical position before you replace the torque tube, you can adjust these components:
 -
The latch roller

 -
The stop pin on the lower gate

 -
The emergency power trigger

 -
The shear pin clearance

 -
The girt bar mechanism.

 (b)  Make the vertical position mark of the door in the opening.
 S 012-007
 (3)  Remove the handle mechanism pushrod at the cocking crank.
 NOTE: Do not change the rod adjustment.
____
 S 022-008
 (4)  
Remove the torque tube.

 (a)  
Remove the coupling bolts from the lower shaft and the lower coupling.

 (b)  
Loosen the lower adjusting nut on the coupling.

 (c)  
Remove the fasteners that hold the upper and lower couplings.

 (d)  
Move the lower coupling down on the shaft and remove the lower shaft.

 (e)  
Remove the coupling bolt from the upper shaft.

 (f)  
Loosen the upper adjusting nut on the coupling.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (g)  
Remove the upper coupling and upper shaft.

 (h)  
Remove the fasteners that attach the bearing plate to the door structure.

 TASK 52-11-12-402-048
 3.  Main Entry Door 1 Torque Tube Removal (Fig. 201)_____________________________________
 A. Consumable Materials
 (1)  
D00013 - Grease, MIL-G-23827

 (2)  
D00015 Grease - Corrosion Preventive, BMS 3-24

 B.
References

 (1)  
AMM 52-11-01/501, Main Entry Door

 (2)  
AMM 52-11-02/401, Main Entry Door Lining and Insulation

 C.
Access

 (1)  
Location Zone
 211 Main Deck, Nose to First Door, LH

 (2)  
Access Panel
 831L Door - No. 1 Main Entry, LH

 D.
Procedure

 S 422-010
 (1)  
Install the door torque tube.

 (a)  
Put the bearing plate on the door structure.

 (b)  
Align the pushrod with the cocking crank and install the upper shaft on the hinge arm splines.

 (c)  
Attach the pushrod to the cocking crank.

 (d)  
Temporarily install the adjusting nut, lockwasher and spacer on the upper shaft (Detail B).

 (e)  
　
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