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 B.  The rigid cargo linings are thin sheets of glass fabric laminations. The rigid cargo linings have fire-resistant and high strength properties to prevent damage to the structure behind the linings. Some of the rigid cargo linings have a thick honeycomb core bonded between the sheets of the glass fabric laminations. The procedures which follow apply only to the rigid cargo linings which do not have a honeycomb core. Refer to AMM 25-00-00/801, Equipment/Furnishings, to repair the rigid cargo linings which do have a honeycomb core.
 C.  The flexible cargo linings are thin sheets of glass fabric laminations bonded to layers of neoprene (synthetic rubber).
 D.  The tasks for the repair of the cargo liners are as follows:
 (1)  Cargo Liner Tape Repairs
 NOTE: This procedure replaces the tape which is loose or damaged
____
 on the cargo linings.

 (2)  Rigid Cargo Liners Permanent Repairs
 NOTE: This procedure uses a patch or doubler and adhesives to
____ repair the rigid cargo linings. The patch or doubler must be made of the same material as the rigid cargo lining.
 (a)  There are two permanent repair alternatives for the rigid cargo liners. 1) It is not necessary to remove the liners from the airplane
 for these permanent repairs. It is necessary to make sure
 that underlying structure is not contacted by screws when
 you use repair (a):
 a) The use of screws with a bonded fiberglass patch.

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A
747-400 MAINTENANCE MANUAL
 2)  It is not necessary to remove the liners for these permanent repairs: a) The Thermion Repair System which uses a bonded patch.
 (b)  If the permanent repairs done to the cargo liners are not one of the above alternatives, install mechanical fasteners around the edges of the existing patches. Refer to one of the first two permanent repair procedures for the fastener installation. If you can remove the old patch, such as a temporary repair, install a bonded patch over the original damage. Refer to one of the last two permanent repair procedures for the installation of a bonded patch.
 (3)  Flexible Cargo Liners Permanent Repairs
 NOTE: This procedure uses a patch and an adhesive to repair the
____ flexible cargo linings. The patch must be made of the same material as the flexible cargo lining.
 (4)  
Repairs for Molded Panels, Shrouds, and Panels with Complex Curves.

 (5)  
Flexible Cargo Liner Zipper Slider Repairs

 NOTE: This procedure replaces the zipper sliders which are
____
 damaged.

 TASK 25-52-01-308-001
 2.  Cargo Liner Tape Repairs
________________________
 A.  General
 (1)  This procedure gives the instructions to replace the loose or damaged tape on the cargo linings. It is important to replace the loose or damaged tape. The tape is used to prevent the leakage of the fire retardant (halon gas) out of the cargo compartments. Thus, it is necessary to install the tape correctly. The procedure has these parts:
 (a)  
Remove the loose or damaged tape

 (b)  
Clean the cargo lining with a solvent

 (c)  
Install the new tape.

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 B.
C.
D.
A
747-400
MAINTENANCE MANUAL

 WARNING: OBEY THE INSTRUCTIONS FROM THE INDUSTRIAL HYGIENE, FIRE, AND
_______ SAFETY ORGANIZATIONS FOR THE NECESSARY PROCEDURES AND EQUIPMENT WHEN YOU USE SOLVENTS. DO NOT GET THE SOLVENTS IN YOUR MOUTH OR EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM THE SOLVENTS. USE A PROTECTIVE SPLASH GOGGLE, GLOVES, AND A RESPIRATOR (IN CONFINED AREAS) WHEN YOU USE THE SOLVENTS. KEEP THE SOLVENTS AWAY FROM ALL SOURCES OF IGNITION (HEAT, FLAME, AND SPARKS). THE SOLVENTS YOU USE ARE POISONOUS AND FLAMMABLE. IF YOU DO NOT USE THE CORRECT PROCEDURES AND EQUIPMENT, INJURY TO PERSONS OR DAMAGE TO THE EQUIPMENT CAN OCCUR.
　
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