(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 07-11-11/201, Jacking Airplane
(2)
AMM 32-00-01/201, Landing Gear Down 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 32-00-01/201).
S 566-003
(2)
Lift the airplane on jacks until the inner cylinder is fully extended (AMM 07-11-11/201).
NOTE: You can temporarily overinflate the shock strut if you do
____ not have jacks to lift the airplane.
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737-300/400/500MAINTENANCE MANUAL
S 116-004
(3)
Clean the chrome plated area on the inner cylinder of the shock strut with solvent. Wipe the chrome dry.
E.
Procedure
S 216-005
(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.
(c) Move the sharp edge of a new hard plastic scraper perpendicular over all the exposed chrome plated surface with a smooth movement and light hand pressure.
NOTE: You will feel a "grab" or a "catch" when you go over a
____ wide crack with this method. Make sure the plastic scraper is new, as used scrapers will not satisfactorily find the cracks.
(d) If you see any possible area of corrosion, chipping, or lifting chrome plate, or if you felt a wide crack with the plastic scraper, reinspect the area with a metal dental explorer. Move the sharp point of the explorer with medium hand pressure to go over the area of suspected damage. Go over the area with the dental explorer from multiple directions. If the chrome is lifting and/or loose try to pick it off with the metal explorer.
NOTE: If you feel a sudden high resistance when you go
____ over the area, but do not see signs of possible corrosion, then this is a site with a wide crack. It is an area that must have more protection and be closely monitored. Repair this area with the crack repair procedure. If you are able to remove or lift small pieces of chrome plate from the base metal, if there are bubbles in the chrome, or if the crack extends to the base metal the inner cylinder is not serviceable.
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S 216-006
(2)
If you find wide cracks, do the steps that follow:
(a)
Look for one or more of the conditions that follow to find signs of possible corrosion under the chrome plating: 1) Poor chrome bonds with the base metal. 2) Bubbles in the chrome plating. 3) An area of chrome plate that moves above the smooth surface
of the adjacent chrome plate when you move the dental
explorer across it.
4) Chrome plate that comes off in flakes when you move the dental explorer over the chrome plate. If any of these conditions are present the inner cylider is not serviceable.
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