747-400 AMM 飞机维护手册 机翼 WINGS(38)

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 S 348-011
 (2)  Polish the lens with your hand.
 (a)  When the machines that polish and the approved persons are not available, you can polish with your hand as follows: 1) Polish the area to the necessary finish with 0000 wet rouge
 that you apply to a wet approved cloth.
 NOTE: Apply the polish to a clean, wet, approved cloth
____ and polish until you get the necessary finish. Rub with the approved cloth.
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747-400 MAINTENANCE MANUAL
 S 348-012
 (3)
Apply a thin, continuous layer of wax with an approved cloth.

 S 348-013

 (4)  
Rub lightly through circular motions to make it shiny.

 TASK 57-23-01-308-017
 3.  Wingtip Lens Temporary Repair_____________________________
 A. Standard Tools and Equipment
 (1)  
Drill Motor

 (2)  
Bits - Drill, 3/16, 1/4 inch or 3/8 inch

 B. Consumable Materials
 (1)  
G00000 Paper - Abrasive, Wet or Dry, 240, 280, 320, 400, 600 Grit

 (2)  
RTV-174 Silicone Sealant
 General Electric Corporation
 Waterford, NY 12188

 (3)  
Clear Mylar Tape

 (4)  
Location Zone
 538 Wingtip, Left
 638 Wingtip, Right

 

 C. Temporarily Repair Crack(s) in the Lens
 S 038-018
 (1)
Remove the forward fairing of the wingtip (AMM 57-23-01/401).

 S 218-019

 (2)  
Examine the condition of the lens.

 NOTE: If the lens has multiple repairs or cracks, or if any
____ of the cracks are continous from one edge of the lens or attachment hole to another, you must replace the lens. Do not repair the lens. You must satisfactorily see light come out of the lens for the lens to have an effect. Continued use of lens that has multiple repairs or cracks is a safety of flight concern.
 S 038-020
 (3)  Remove the lens.
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A 747-400 MAINTENANCE MANUAL
 (4)  S 348-021Drill a 3/16, 1/4 inch or 3/8 inch diameter hole at the end of the crack to stop drill the crack.
 NOTE:____ Be careful when you drill into the acrylic lens because you can damage it easily. It is recommended that you drill holes in MIL-P-8184 or MIL-P-5425 acrylic plastic sheet before you drill the lens. The material must be 0.10 inch thick.
 (5)  S 348-022Rub the abrasive paper around the hole to remove all cracks or chips in the acrylic.
 (6)  S 348-023For cracks in any direction, stop drill and seal with RTV-174 Silicone Sealant, apply clear mylar tape to the crack in the lens for a temporary repair.
 NOTE:____ This repair is only a temporary repair to prevent a flight delay or cancellation and will allow the airplane to fly until replacement parts can be obtained and installed.
 (7)  S 438-024Install the lens. (a) For lenses with fixed grommets, torque fasteners to 25-35 inch pounds (2.8-4.0 Newton meters). (b) For lenses with rubber and aluminum washer assemblies, tighten fastener until the large outer dimpled washer is snug against the lens.
 (8)  S 438-025Install the forward fairing of the wingtip (AMM 57-23-01/401).

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747-400 MAINTENANCE MANUAL
 WINGLET - DESCRIPTION AND OPERATION
___________________________________
General
　
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