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 S 866-016
 (5)  Open the door approximately 90 degrees.
 S 216-017
 (6)  Examine the upper and lower hinge, the door torque tube, and the body torque tube. (a) Look at the upper and lower hinge through the hinge openings in the door.
 (b) (c) (d)  Make sure there are no cracks or corrosion on the hinges or the guide arm.Look at the door torque tube through the opening in the door.Do a check for cracks, corrosion, or damage on the components that follow:
 NOTE:____ Use a mirror if it is necessary.
 (e) (f)  1) The upper and lower shaft 2) The couplings 3) The bearing and bearing assemblies 4) The crank and control rod attach fitting.Examine the body torque tube through the opening from the maintenance access panel.Do a check for cracks, corrosion, or damage on the components that follow:
 1) 2) 3) 4) 5) 6) 7) 8)  The upper or lower link and attach fitting to the hinge armThe bearing and bearing assembliesThe sleeves and shaftThe rotary snubberThe anchor plate and the attach fittingsThe hold-open assemblyThe bellcrank linkThe guide plate and guide arm connection.
 S 866-018
 (7)  Close the door.

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747-400 MAINTENANCE MANUAL
 S 416-019
 (8)  
Install the maintenance access panel, forward of the door, on the outer fuselage of the airplane.

 S 416-020

 (9)  
Install the hinge covers on the inner side of the door.

 S 416-021

 (10)
 Install the lining on the door (Ref 52-11-02/401).

 S 096-022

 (11)
 Remove the aerostand outboard of the door.

 TASK 52-11-00-206-023
 5.  Examine the Manual Operation Latch Mechanism on the Main Entry Door___________________________________________________________________ (Fig. 601)
 A.  Standard Tools and Equipment
 (1)  
Aerostand (necessary to get to the main entry door (door) from the outer side of the airplane).

 B.  
References

 (1)  
52-11-02/401, Main Entry Door Lining and Insulation

 C.  
Access

 (1)  
Access Panel
 831L Door - No. 1 Main Entry, LH
 835L Door - No. 5 Main Entry, LH

 D.  
Examine the Manual Latch Mechanism

 S 016-024
 (1)  
Remove the lining from the door (Ref 52-11-02/401).

 (2)  
Install the aerostand immediately outboard of the door.

 (3)  
Remove the control cam from the handle mechanism.

 (4)  
Examine the latch mechanism.

 S 496-025
 S 016-026
 S 216-027
 NOTE: Use a mirror if it is necessary.
____
 (a)  Examine the latch and cocking cranks for corrosion and general condition.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (b)  
Examine the torque tubes, cranks, control rods and gate control rods through the access holes in the door. 1) Examine each of these components for the cracks, corrosion

 and general condition. 2) Make sure the attach fittings are tight and in good condition.

 (c)  
Install the control cam.

 (d)  
Open the door.

 (e)  
Examine each latch roller on the door and the latch fittings on the airplane structure. 1) Make sure the latch rollers and fittings are tight and have

 no cracks or corrosion.
 S 416-028
 (5)  
Close and latch the door.

 S 416-029

 (6)  
Install the lining on the door (Ref 52-11-02/401).

 S 096-030

 (7)  
Remove the aerostand outboard of the door.

 TASK 52-11-00-206-031
 6. Examine the Internal Handle for the Main Entry Door
　
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