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747-400
MAINTENANCE MANUAL

 (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.
 S 216-008
 (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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747-400 MAINTENANCE MANUAL
 CAUTION: MAKE SURE THE SUBSEQUENT INSPECTIONS CHECK THE REPAIR
_______ UNTIL THE SHOCK STRUT IS OVERHAULED. CONTINUED USE OF A LANDING GEAR WITH THE REPAIR FOR CRACKING CHROME MAY RESULT IN SEAL DAMAGE, SHOCK STRUT FLUID CONTAMINATION, AND POSSIBLE STRUT PRESSURE LOSS. THERE IS NO PERMANENT REPAIR FOR CRACKED CHROME, THE CRACK WILL REMAIN UNTIL THE CHROME IS REMOVED AND REPLACED.
 (b)  After the temporary repair is done, make sure the inspection procedure (AMM 32-00-03/601) is done between four and six months again, and again until the shock strut is removed and replaced. Once chrome is damaged, there is no permanent repair, and the damage can continue to spread. The only permanent repair is to strip and replate the chrome. 1) Measure the size of the area that has the cracks, and make
 a sketch of the location and shape of the area, and mark the dimensions on the sketch. Make sure you keep this data so it can be used for the next inspection.
 2)  Use a wiper to apply a thick layer of primer to the cracked chrome surface.
 3)  Before the primer dries, remove the excess with a clean, dry cloth. Make sure no primer gets on the seals or scrapers, as they can be damaged by the primer and may start to leak.
 4)  Let the primer cure for at least 4 hours.
 F.  Put the Airplane back to its Usual Condition
 S 016-006
 WARNING: YOU MUST CAREFULLY DO THE STEPS WHEN YOU REMOVE THE DOOR LOCKS
_______ FROM THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  Do this task: "Removal of the Door Locks from all Landing Gear Doors." (AMM 32-00-30/201).
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