(4)  
AMM 32-00-30/201, Landing Gear Door Locks

 (5)  
AMM 32-22-01/201, Forward Nose Wheel Well Doors

 (6)  
AMM 32-22-04/401, Nose Wheel Well Aft Door Operator

 (7)  
AMM 34-31-00/501, VOR/ILS Navigation System

 (8)  
AMM 34-31-04/401, Glide Slope Track Antenna

 (9)  
AMM 51-31-01/201, Seals and Sealing

 D.
Access

 (1)  
Location Zone
 713 Nose Landing Gear Door, Aft, LH
 714 Nose Landing Gear Door, Aft, RH

 E.
Prepare for the Procedure

 S 414-057
 (1)  If the door you will install does not have the glide slope antenna installed, install the glide slope antenna (AMM 34-31-04/401).
 NOTE: You can install the antenna from the door you removed if it
____
 is serviceable.

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747-400 MAINTENANCE MANUAL
 (2)  S 834-006Make sure you adjust and test the glide slope antenna before you install the door on the airplane (AMM 34-31-00/501).
 (3)  S 494-007Make sure the forward nose landing gear doors are installed and correctly adjusted (AMM 32-22-01/201).
 (4)  S 224-062Examine the worn parts and attach fittings for permitted wear limits (AMM 32-22-02/601).
 S 494-008

 WARNING: MAKE SURE YOU INSTALL THE GROUND LOCKS IN ALL LANDING GEAR TO
_______ PREVENT ACCIDENTAL OPERATION OF THE GEAR. IF THE GEAR RETRACTS IT CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (5)  
Make sure the ground locks are installed in all the landing gear (AMM 09-11-00/201).

 S 034-009

 (6)  
Remove the seal plate from the forward edge of the aft door (Fig. 403).

 S 824-010

 (7)  
Remove the spring clips and loosen the stop bolts of the aft door stops (Fig. 401).

 S 864-011

 (8)  
Pressurize the hydraulic system No. 1 (AMM 29-11-00/201).

 S 584-012

 (9)  
Lift the nose of the airplane with jacks for nose gear retraction (AMM 07-11-02/201).

 S 094-046
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ DOOR LOCKS FROM THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (10)
 Do this task:  "Removal of the Door Locks from the Nose Landing Gear" (AMM 32-00-30/201).

 (11)
 Remove the ground locks on the nose landing gear (AMM 09-11-00/201).

 S 014-066
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747-400
MAINTENANCE MANUAL

 S 864-015
 WARNING: MAKE SURE THE AREA BELOW THE NOSE OF THE AIRPLANE IS CLEAR
_______ BEFORE YOU RETRACT THE NOSE LANDING GEAR. FAILURE TO DO CAN CAUSE AN INJURY TO PERSONS OR DAMAGE THE EQUIPMENT.
 (12)
 Move the control handle of the landing gear to the UP position to retract the nose landing gear.

 F.
Procedure

 S 644-017
 (1)  
Apply a layer of grease to the bolt shanks and threads, spacers and bushings surfaces.

 S 424-018

 (2)  
Hold the door (1 or 2) in its position and install the hinge bolts (3), washers (4 and 6), spacer (5) and nut (7).

 S 834-019

 (3)  
Adjust the aft wheel well doors:

 NOTE: The only adjustment possible for clearance between the doors
____ and the fuselage is to trim the doors. For new doors it can be necessary to trim the doors to get the correct clearance. If you trim the door too much you can not make the door servicable again.
 (a)  Hold the doors closed with your hands and do the steps that follow to make sure the clearances are correct:
 NOTE: Table 401 shows expanded tolerances which were permitted
　
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