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A 747-400 MAINTENANCE MANUAL
 (2)  S 212-006Examine the protective finish on the fittings for damage and deterioration.
 NOTE:____ Refer to 51-24-00/001 for the repair of the protective finishes.
 (3)  S 212-007Examine the protective finish on the cargo trucks for damage and deterioration. (a) Do this task to repair the protective finish on the cargo tracks: "Cargo Tracks- Cleaning and Painting" (ref 53-44-01/701).
 (4)  S 212-008Examine the area adjacent to the fittings for contamination.

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747-400 MAINTENANCE MANUAL
 CARGO COMPARTMENT CARGO TRACKS - CLEANING/PAINTING
__________________________________________________
 1.  General_______
 A.  This procedure has one task. The task gives instructions to clean and paint the cargo tracks in the cargo compartment.
 B.  The forward and aft cargo tracks consist of 7178 aluminum alloy extrusions which have been anodized with chromic acid. It is necessary to keep the cargo tracks clean and free of moisture. You must use this procedure to remove the corrosion you find on the cargo tracks.
 C.  The cargo track fasteners are installed through the center of the cargo track. Use a brush to apply a layer of the sealant BMS 5-95, Type A to the countersunk piece.
 TASK 53-44-01-107-001
 2.  Cargo Tracks-Cleaning and Painting__________________________________
 A.  Consumable Materials
 (1)  
C00064 Alodine, Clear, MIL-C-5541

 (2)  
A00247 Sealant, Chromate, BMS 5-95, Class B

 (3)  
B00083 Solvent, TT-N-95, Aliphatic Naphtha

 (4)  
G00383 Paper - Aluminum Oxide, 320 grit

 B.  References
 (1)  51-21-04/701, Alodized Surfaces
 C.  Access
 (1)  Location Zones 121 Forward Cargo Container Compartment, Forward Half,Left 122 Forward Cargo Container Compartment, Forward Half, Right 123 Forward Cargo Container Compartment, Aft Half, Left 124 Forward Cargo Container Compartment, Aft Half, Right 141 Aft Cargo Container Compartment, Left 142 Aft Cargo Container Compartment, Right 145 Bulk Cargo Compartment, Left 146 Bulk Cargo Compartment, Right
 D.  Procedure
 S 117-005
 (1)  Clean the cargo tracks:
 (a)  
Clean the cargo track with aliphatic naphtha to remove all the oil or grease.

 (b)  
Rub the cargo track with the paper-aluminum oxide(320-grit) to remove the corrosion.

 (c)  
Use a vacuum cleaner to remove all the loose unwanted materials.

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747-400 MAINTENANCE MANUAL
 (d)  Clean the area with aliphatic naphtha one more time.
 S 377-003
 WARNING: DO NOT GET ALODINE IN YOUR MOUTH OR EYES, OR ON YOUR SKIN.
_______ PUT ON A PROTECTIVE SPLASH GOGGLE AND GLOVES WHEN YOU USE ALODINE. ALODINE CONTAINS CHROMATIC ACID WHICH CAN CAUSE INJURY TO PERSONS.
 DO NOT LET CLOTHS THAT ARE SOAKED WITH ALODINE BECOME DRY. SOAK THESE CLOTHS IN WATER WHEN YOU DISCARD THEM. DRY CLOTHS THAT HAVE ALODINE CAN START TO BURN SUDDENLY.
 (2)  
Do this task to apply the clear alodine to the surfaces of the cargo track: "Alodized Surfaces - Cleaning/Painting" (Ref 51-21-04/701).

 S 347-006
　
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