757 AMM 飞机维护手册 起落架 CHAPTER 32 - LANDING GEAR 2(5)

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 is found on top of the outer cylinder of the shock strut.
 S 864-027
 WARNING: LOOSEN THE SWIVEL NUT A MAXIMUM OF TWO TURNS. AIR PRESSURE CAN_______
 BLOW THE VALVE OUT AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO
 EQUIPMENT.
 (2) Loosen the swivel nut a maximum of two turns.
 S 034-006
 (3) When the shock strut is fully deflated, open the swivel nut fully.
 S 494-007
 (4) Move the towing lever on the metering valve for the nose wheel
 steering to the TOWING position. Install the lockpin for the towing
 lever.
 S 494-008
 (5) Install the shock strut lock. Use the instructions supplied with
 the tool.
 S 584-009
 (6) Lift the nose of the airplane until the wheels are above the ground
 (AMM 07-11-02/201).

 

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757
MAINTENANCE MANUAL

 S 034-028
 (7)  
If you remove the trunnion pin on the left hand side, you must also remove the cables.

 (a)  
Put the system for the nose wheel steering in the center position. Move the wheel assembly to put the alignment mark less than 1/4 degree from the scale center on the upper support plate. The alignment mark is located on the steering collar.

 (b)  
Install the rig pins NS-1 and NS-2 in the captain's and the first officers's forward quadrants.

 (c)  
Install the rig pin NS-4 in the control valve input lever.

 (d)  
Remove the lock, the castellated nut, and the seal ring.

 (e)  
Attach tags to the NWSA, the NWSB, the NGPPA, and the NGPPB cables.

 (f)  
Disconnect the cables at the turnbuckles. The turnbuckles are located above the pulley brackets on the lower left hand side in the electrical/electronics bay, panel 119BL (Ref 06-41-00).

 (g)  
Move the seal assembly and the cables out of the trunnion pin. Keep the seal assembly and the cables away from movable surfaces and equipment.

 S 584-010
 (8)  
Lift the shock strut with the axle jack until there is no weight on the trunnion pins.

 S 014-011

 (9)  
Get access to panel 119BL. Remove the two lockbolts, the nut for the trunnion pin and the tang washer (Views A-A, B-B).

 S 024-012

 (10)
 Remove the trunnion pin with the trunnion pin puller.  Use the instructions on the tool.

 S 214-034

 (11)
 Examine the keyway on the trunnion pin.

 (a)  
Make sure the potting compound is intact.

 

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757 MAINTENANCE MANUAL
 (b)  If the potting compound is not intact, look for a buildup of too much grease on the side of the wheel well wall where the trunnion pin nut is installed.
 TASK 32-21-12-404-013
 3.  Install the Trunnion Pin for the Nose Landing Gear (Fig. 401)__________________________________________________
 A. Equipment
 (1)  
Shock Strut Restraint, NLG - B32019-1

 (2)  
Nose Gear Towing Lever Lockpin - A09003-1

 (3)  
Rig Pins from set B20003-XX

 (a)  
Rig Pin - NS1 (Ref 20-10-24)

 (b)  
Rig Pin - NS2 (Ref 20-10-24)

 (c)  
Rig Pin - NS4 (Ref 20-10-24)

 (4)  
Automotive-type axle jack - commercially available

 B.
Consumable Materials

 (1)  
D00633 Grease - BMS 3-33 (Recommended)

 (2)  
D00013 Grease - MIL-G-23827 (Alternative)

 C.
References

 (1)  
AMM 07-11-02/201, Jacking Airplane Nose

 (2)  
AMM 12-15-02/301, Nose Gear Shock Strut

 (3)  
AMM 32-00-15/201, Landing Gear Door Locks

 (4)  
AMM 32-51-00/501, Nose Wheel Steering System

 D.
Access

 (1)  
Location Zones
 119/120 Main Equipment Center
 711 Nose Landing Gear (NLG)
 713/714 Forward NLG Door
 715/716 Aft NLG Door
 730/740 Main Landing Gear and Doors

 (2)  
Access Panels
 119BL Main Equipment Center

 E.
Install the Trunnion Pin

 S 214-035
 (1)  
Examine the keyway on the trunnion pin.

 (a)  
Make sure the potting compound is intact.
　
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