INBOARD RIB CLOSURE AND TIP SEAL MINOR REPAIR (Continued)

INBOARD RIB CLOSURE AND TIP SEAL MINOR REPAIR (Continued) - TM-55-1520-240-23-4_457

TM-55-1520-240-23-4 CH-47D Heilcopter Manual
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TM 55-1520-240-23-4 5-76 INBOARD RIB CLOSURE AND TIP SEAL MINOR REPAIR (Continued) 5-76 g. Cut a piece of polyvinyl sheet (E284) large enough to overlap sealing tape (9) in all directions. h. Press polyvinyl sheet (12) onto sealing tape (9) to make airtight seal. Smooth out wrinkles. i. Start vacuum pump. Check for leaks. Reposition polyvinyl sheet or add sealing tape (E396) as needed. 18. Maintain 20 inches Hg during adhesive cure time. Do not exceed 180ºF (82ºC) at blade surface. Damage to fiberglass can occur. 19. Cure adhesive at 140º - 160ºF (60º - 71ºC) for 2 hours. Use heat lamp. Monitor temperature. Use temperature indicating strips (E413). NOTE Serviceable cure can be achieved without heat at 70º - 80ºF (21º - 27ºC) in 24 hours. Vacuum may be removed after 2 hours. 20. Turn off vacuum pump. Remove polyvinyl sheet (12), tube (10), tape (9), fiberglass cloth (8), fabric (7), and peel ply (6). 21. Fair adhesive squeezeout to blade surface. Use abrasive paper (E9). INSPECT 22. Weigh unused adhesive in mixing cup. Subtract weight recorded in step 11. The result is the weight of the repair for balance weight adjustment. NOTE All blade repairs, weight adjustment, painting, or balancing will be recorded on rotor blade DA Form 2408-16, each blade requires a separate form. If the rotor blade does not have a DA Form 2408-16, one must be prepared and all actions recorded, as example; location of repair, size of repair, weight of repair, and required weight adjustments for track and balance. FOLLOW-ON MAINTENANCE: Refinish repaired area (Task 5-82). Adjust balance weights (Task 5-82.1). END OF TASK 5-438

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