747-400 AMM 飞机维护手册 EQUIPMENT/FURNISHINGS 1(13)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 888-014
 CAUTION: BE CAREFUL WHEN YOU APPLY HEAT NEAR MATERIALS THAT CAN BURN.
_______
 THE TEMPERATURE OF THE TEDLAR MUST NEVER BE MORE THAN 200°F OR THE TEMPERATURE AT WHICH THE TEDLAR DISTORTS, WHICHEVER IS LOWER. TOO MUCH HEAT CAN CAUSE DAMAGE TO THE TEDLAR.
 (7)  Use the heat gun to increase the temperature of the tedlar laminate.
 NOTE: Be careful to make sure the temperature is constant across
____ the surface of the laminate. Refer to 20-11-25/201 for cautions to obey when you use heat guns.
 S 348-098
 (8)  
Rub the tedlar laminate until the bond is satisfactory and you cannot see bubbles.

 S 348-064

 (9)  
Do these steps to use a vacuum to make sure the laminate touches all of the panel:

 (a)  
Use the maximum vacuum possible that will not cause damage to the panel.

 (b)  
Cure the laminate for 24 hours at room temperature, for two hours at 120 degrees F, or for 30 minutes at 180 degrees F.

 (c)  
Let the part cool to 90 degrees F before you remove the vacuum pressure.

 

 TASK 25-00-00-308-184
 4.  Decorative Tedlar Removal/Installation______________________________________
 A. General
 (1)  This task gives instructions to replace a damaged decorative tedlar laminate on the honeycomb sandwich panels.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 B. Equipment
 (1)  Heat Gun - 1200 to 1500 watts
 C. Consumable Materials
 (1)  
Heat protective gloves (commercially available)

 (2)  
A50010 Adhesive - BMS 5-127 Type IV

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

 (4)  
G00034 Cheesecloth - Lint-free

 (5)  
G00000 Laminate - Decorative Tedlar

 D. References
 (1) AMM 20-11-25/201, Heat Guns, Soldering Guns, and/or Soldering Irons
 E. Access
 (1)  Location Zone
 200 Upper Half of the Fuselage

 F. Decorative Tedlar Removal
 S 018-185
 (1)  Do the following steps to remove the decorative tedlar laminate from the base panel.
 NOTE: This repair procedure is best completed after the panel
____
 is removed from the airplane.

 (a)  
Attach the panel safely with the decorative side in the up position.

 (b)  
Put on the heat protective gloves.

 (c)  
Apply heat to the corner of the panel (AMM 20-11-25/201).

 NOTE: Do not let the heat collect in one spot for more
____
 than 20 seconds.

 (d)  
Start removing the decorative laminate by prying at the corner of the panel.

 (e)  
Slowly pull the laminate from the panel surface.

 (f)  
Point the heat gun in front of the area where the decorative laminate continues to be attached to the panel. 1) Keep a constant pressure on the laminate as you pull it

 from the panel. 2) When the temperature gets to the correct level, the laminate will release from the panel.

 (g)  
Continue this procedure until the decorative laminate is fully removed.

 G. Decorative Tedlar Installation
 S 418-186
 (1)  Do the following steps to install the decorative tedlar laminate to the base panel.
 (a)  
Clean the panel surface with a clean cheesecloth that is soaked with aliphatic naphtha.

 (b)  
Apply adhesive to the panel surface.

 (c)  
Align the decorative laminate by the pattern location.

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