(2)  
AMM 12-15-05/301, Nose Landing Gear Shock Strut

 (3)  
AMM 32-00-30/201, Landing Gear Door Locks

 (4)  
Location Zone
 715 Nose Landing Gear

 C.  
Prepare for the Procedure

 S 492-020
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1) Install the ground locks in all landing gear (AMM 09-11-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-21-02
 ALL  ú ú 01 Page 201 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

OUTER CYLINDER
GLAND NUT
INNER CYLINDER
ASSEMBLY
SPLIT SCRAPER
(TEMPORARY REPLACEMENT ONLY)
A-A

Scraper Ring Installation for the Nose Landing Gear
Figure 201

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-21-02
 ALL  ú ú 01 Page 202 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A39381
A
747-400 MAINTENANCE MANUAL
 S 492-021
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASKS BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Do this task: "Installation of the Door locks on the Wing Landing Gear" (AMM 32-00-30/201).

 S 492-022

 (3)  
Do this task: "Installation of the Door locks on the Body Landing Gear" (AMM 32-00-30/201).

 D.
Procedure

 S 612-023
 (1)  
Do this task: "Shock Strut Servicing Fast Check (AMM 12-15-03/301).

 S 212-037

 (2)  
Inspect the shock struts for leakage.

 S 212-028

 (3)  
If you find leakage of the shock strut fluid on the inner cylinder, make sure the shock strut is serviceable:

 (a)  
Wipe the surface of the inner cylinder with a clean cloth to remove all of the fluid from the leak. 1) Make sure the extension of the inner cylinder does not

 change during this time. 2) Make a record of the number of drops which come from the
 seals during the 15 minutes. 3) Make a record of the location of the leak. 4) Tow the airplane to cause movement between the inner
 cylinder and the outer cylinder of shock strut (AMM 09-11-00/201).
 NOTE: The minimum distance the airplane must be moved is
____ two airplane lengths.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-21-02
 ALL  ú ú 01 Page 203 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (b)  
Wipe the surface of the inner cylinder again with a clean cloth to remove all of the fluid from the leak.

 (c)  
Monitor the inner cylinder where it meets with the outer cylinder for 15 minutes. 1) Make sure the extension of the inner cylinder does not

 change during this time. 2) Make a second record of the number of drops which come from the seals during the 15 minutes. 3) Make a record of the location of the leak.

 (d)  
Calculate the average of the number of drops which came from the seals from both of the 15 minute measurements.

 NOTE: If the average is less than 30 drops during the 15
____ minutes time, the shock strut is serviceable. If the leakage flows continuously from the seals or is greater than 30 drops during the 15 minutes, then the shock strut is not serviceable.
 S 212-054
 (4)  If the leakage stopped, do the step that follows:
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 起落架 LANDING GEAR 3(113)