D.
Access

 (1)  
Location Zones
 711 Nose Landing Gear (NLG)
 713/714 NLG Door Forward
 715/716 NLG Door Aft

 E.
Prepare to Replace the Active and Spare Seals

 S 022-153
 (1)
Remove the shock strut inner cylinder (AMM 32-21-24/401).

 F.
Replace the Active and the Spare Seals

 NOTE: If the spare seals are installed and serviceable, they do not need
____
 to be replaced.

 S 032-096
 CAUTION:_______BE CAREFUL NOT TO CAUSE DAMAGE TO THE INNER CYLINDER. DAMAGE
 ON THE SURFACE OF THE INNER CYLINDER CAN CAUSE DAMAGE TO THE
 SEALS.
 (1) Remove the backup rings (13, 15) from the lower bearing.
 

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 S 032-098
 (2)  
Cut the seals (12, 14, 16, 17) from the lower bearing with the plastic tool and the backup strip.

 S 642-099

 (3)  
Apply a thin layer of hydraulic fluid and petrolatum to the new seals (12, 14, 16, 17).

 S 842-100

 (4)  
Move the new seals (12, 14, 16, 17) and the new backup rings (13, 15) down the inner cylinder (8) into the lower bearing (24) as follows:

 (a)  
Two spare static seals (17).

 (b)  
Two spare dynamic seals (16).

 (c)  
One active static seal (14).

 (d)  
Two backup rings (15).

 (e)  
One backup ring (13).

 (f)  
One active dynamic seal (12).

 (g)  
One backup ring (13).

 G.
Put the Airplane Back to Its Usual Condition

 (1)  
Install the shock strut inner cylinder (AMM 32-21-24/401).

 S 422-152
 

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 NOSE GEAR DOORS - DESCRIPTION AND OPERATION
___________________________________________
 1.  General (Fig. 1)_______
 A.  The nose gear doors consist of forward and aft doors. The doors close over the wheel well to provide aerodynamic smoothness during flight.
 2.  Component Details_________________
 A.  Forward Doors
_____________
 (1)  
The forward doors are hydraulically operated and close when the gear is retracted or extended. The doors are of clamshell type and include a left and right door.

 B.  
Forward Door Operating Mechanism (Fig. 2)

________________________________
 (1)  
The mechanism consists of a bellcrank and rods. The bellcrank is connected to the door actuator and the rods are connected to the bellcrank and forward doors. The mechanism is a mechanical link from the door actuator to the doors.

 C.  
Aft Doors

_________
 (1)  
The aft doors are mechanically connected to the gear and only close when the gear is retracted. The doors are of clamshell type and include a left and right door.

 D.  
Aft Door Operating Mechanism (Fig. 3)

____________________________
 (1)  The mechanism consists of two rods and a bellcrank. The aft rod is connected to the shock strut and bellcrank, the forward rod is connected to the bellcrank and the aft door. A left mechanism controls the left door and a right mechanism controls the right door.

FORWARD
AFT
DOOR
DOOR

FWD
Nose Gear Doors Figure 1
 

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DOOR ACTUATOR

Forward Door Operating Mechanism
Figure 2

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MAINTENANCE MANUAL

BELLCRANK RODROD
SHOCK STRUT
AFT DOOR
Aft Door Operating Mechanism

Figure 3

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 NOSE GEAR DOORS - ADJUSTMENT/TEST
_________________________________
 1.  General_______
 A.  This procedure contains one task. This task adjusts the forward and aft doors of the nose landing gear. The aft doors must be adjusted before you adjust the forward doors.
　
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