32-12-00
 ALL  ú ú 02 Page 511 ú Sep 28/01
 
A
757
MAINTENANCE MANUAL

COMPRESSED THE TOTAL LENGTH OF THE DOOR
Main Landing Gear Trunnion Fairing Door Adjustment Figure 503

 32-12-00
 ALL  ú ú 02 Page 512 ú May 20/98
 
A
757 MAINTENANCE MANUAL
 S 495-003
 WARNING:_______OBEY THE INSTALLATION PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  
Open the doors for the landing gear and install the door locks (AMM 32-00-15/201).

 S 865-004

 (3)  
Remove the pressure from the left hydraulic system and reservoir (AMM 29-11-00/201).

 F.
Adjust the Main Landing Gear Door (One-Piece Door)

 S 035-005
 (1)  
Loosen the bolt for the center door stop.

 S 845-006

 (2)  
Put the washers which are behind the head of the bolt below the nut (Detail A).

 S 035-007

 (3)  
Disconnect the hydraulic lines from the door actuator.

 (a)  
Connect the test bench to the door actuator.

 (b)  
Put a plug on the hydraulic lines.

 (c)  
Make sure the hoses from the test bench are clear of the door when the door closes.

 S 035-008
 (4)  Remove the door lock (AMM 32-00-15/201).
 S 865-009
 WARNING: DO NOT USE A RETRACT PRESSURE MORE THAN 1400 PSI WHEN YOU
_______ ADJUST THE DOOR ACTUATOR. RETRACT PRESSURE MORE THAN 1400 PSI CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (5)  
Slowly apply hydraulic pressure to the retract side of the actuator.

 (6)
Monitor the pressure at which the actuator retracts and locks.

 S 975-010
 NOTE: The actuator is locked when the main landing gear door does
____ not open when you remove the hydraulic pressure.
 (a)  
If the actuator locks between 1000 psi and 1400 psi, the actuator is adjusted correctly.

 (b)  
If the actuator locks at a pressure less than 1000 psi, the actuator rod is too long.

 32-12-00
 ALL  ú ú 02 Page 513 ú Sep 28/01
 
A
757
MAINTENANCE MANUAL

 (c)  If the actuator does not lock before you get a pressure of 1400 psi, the actuator rod is too short.
 S 975-011
 (7)  
Measure the gap between the door and the fairing at the forward and aft door stops.

 (a)  
Move the washers on the door stops if it is necessary to get the correct clearance (Details C and D).

 NOTE: When the door is adjusted correctly, the aft door stop
____
 will touch the plate on the door.

 S 865-012
 (8)  
Apply hydraulic pressure to the extend side of the actuator to open the main landing gear door.

 S 865-087

 (9)  
Remove the hydraulic power (AMM 29-11-00/201).

 S 825-013

 (10)
 Adjust the length of the actuator rod, if it is necessary.

 (a)  
Remove the attach pin from the rod end of the actuator (View A-A).

 (b)  
Remove the lockwire.

 (c)  
Loosen the jamnut from the rod end (Detail B).

 (d)  
Increase or decrease the length of the rod, if it is necessary.

 (e)  
Tighten the jamnut.

 (f)  
Put in the attach pin.

 S 845-086
　
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：757 AMM 飛機維護手冊 起落架 CHAPTER 32 - LANDING GEAR 1(146)