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A
747-400 MAINTENANCE MANUAL
 LANDING GEAR SHOCK STRUT INNER CYLINDER - INSPECTION FOR CHROME PLATE CORROSION
_______________________________________________________________________________
 1.  General
_______
 A.  This procedure has two parts. The first is an inspection of the shock strut inner cylinder for chrome cracking or chipping. The second part is to repair cracked chrome on the inner cylinder. There is no standard repair for chipped off chrome. Chrome cracking is a different condition then chrome chipping. If the chrome has chipped, bubbled, lifted, or if the base metal has been exposed there is no standard repair.
 B.  Chrome plateing on large diameter parts will show very small and narrow lines that look like cracks. These lines (microcracks or chicken-wire cracks) naturally occur when the chrome plate was initially applied on the base metal. When you look at these parts in dim light or with a light source angled to the surface for the inspection, you will see these lines.
 TASK 32-00-03-206-001
 2.  Inspection for Cracking and Chipping on the Shock Strut Inner Cylinder Chrome
_____________________________________________________________________________
 A.  Equipment
 (1)  
Dental Explorer

 (2)  
Plastic Scraper

 B.  
Consumable Materials

 (1)  
B00316 Solvent - TT-N-95.

 (2)  
A00964 Primer - BMS 10-11

 (3)  
G00216 Wiper - BMS 15-5, Class A

 (4)  
D00509 Fluid - Hydraulic, Petroleum Base, MIL-H-6083

 NOTE: You can use MIL-H-5606 as an alternate to the preferred
____
 MIL-H-6083.

 C.  References
 (1)  
AMM 07-11-01/201, Jacking Airplane

 (2)  
AMM 09-11-00/201, Landing Gear Down Locks

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

 D.  
Prepare for the Procedure

 S 416-002
 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)  Make sure the ground locks are installed in all the landing gear (AMM 09-11-00/201).
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 32-00-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 416-003
 WARNING: YOU MUST CAREFULLY DO THE STEPS WHEN YOU 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." (AMM 32-00-30/201). Install the locks on both of the main doors and on the nose door.

 S 566-004

 (3)  
Lift the airplane on jacks until the inner cylinder is fully extended (AMM 07-11-01/201).

 NOTE: You can temporarily overinflate the shock strut if you do
____
 not have jacks to lift the airplane.

 S 116-007
 (4)  
Clean the chrome plated area on the inner cylinder of the shock strut with solvent. Wipe the chrome dry.

 E.
Procedure

 S 216-005
 CAUTION: WHEN WORKING ON THE BODY AND WING STRUTS, MAKE SURE YOU DO NOT
_______ MOVE OR DAMAGE THE BODY OR WING TRUCK TILT SENSORS. IF YOU MOVE THE BODY SENSORS DO THE ADJUSTMENT (AMM 32-61-12/201). IF YOU MOVE THE WING SENSORS DO THE ADJUSTMENT (AMM 32-61-22/201).
 (1)  
Examine the chrome surface on the outer diameter of the inner strut for cracks (chicken-wire cracks):

 (a)  
Shine light at an angle to the chrome surface of the inner strut.

 NOTE: You can use a flashlight for this check.
____
 (b)  Look at the surface from different directions to make sure you see all the cracks.
 NOTE: Do not use a magnifying glass to do this inspection.
____ Cracks are normal on the chrome and do not need to be repaired unless they extend to the base metal.
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