747-400 AMM 飞机维护手册 舱门 DOORS 1(7)

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 2)  Procedure B. This procedure uses adhesive and an open-mesh Dacron fabric patch to repair the damaged seal. a) Cut a Dacron fabric patch to fit the area that you will
 repair. b) Apply the adhesive to the repair area on the seal. c) Push the fabric patch into the wet adhesive. d) Apply more adhesive on the patch. e) Make the surface of the adhesive smooth. f) Apply pressure to make sure the parts are fully bonded. g) Let the adhesive dry for the necessary time before the
 seal is used.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 B.
C.
D.
E.
A
747-400 MAINTENANCE MANUAL
 3)  Procedure C. This procedure replaces the damaged part of the seal with a piece of replacement seal. Do one of these steps: a) Miter the seal to get the correct fit and use Procedure
 A to bond the seal with adhesive only. b) Miter the seal to get the correct fit and use Procedure B to bond the seal with adhesive and Dacron fabric.Consumable Materials
 (1)  
A00337 Adhesive, Silastic 140 RTV, Dow Corning

 (2)  
A00303 Adhesive, RTV 174, General Electric

 (3)  
A00923 Adhesive, SR-529 with catalyst SRC-19, General Electric

 (4)  
A00553 Adhesive, BAC 5010 Type 68

 (5)  
A00003 Primer, 1200 RTV, Dow Corning

 (6)  
A00553 Primer 1204, Dow Corning

 (7)  
G00028 Fabric, D-117 or D-118, Dacron

 (8)  
B00148 Solvent - Methyl Ethyl Ketone (MEK), TT-M-261

 (9)  
G00383 Abrasive Paper, 180 grit or finer

 (10)
 G00385 Non-Bondable PUF, Dupont Tedler film, Dupont Tedlar

 (11)
 G00034 CheesclothReferences

 (1)
52-11-02/401, Main Entry Door Lining and InsulationAccess

 (1)  
Location Zones 821R Forward Cargo Door 822R Aft Cargo Door 823R Bulk Cargo Door 831L No. 1 Main Entry Door (Left) 835L No. 5 Main Entry (Left) 847R Upper Deck Emergency Door (Right) 836L Side Cargo Door

Prepare to Repair the Seal
 S 348-044
 (1)  
Make a decision about the correct adhesive.

 (a)  
Use Type I adhesive for the parts of the seal that are not flexible.

 NOTE: Do not use Type I adhesive on the diaphragm seals or on
____
 the lip of the blade seals.

 (b)  
Use Type II adhesive where it is necessary for the seal to be very flexible.

 (c)  
Use Type III adhesive for fast repairs.

 NOTE:____Type III is very flexible. You can use it on all parts of the seal.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 348-034
 (2)  
Type II adhesives (Dow Corning Silastic 140 RTV or Silastic 731 RTV and General Electric RTV 174) have only one part. It is not necessary to prepare a Type II adhesive before you use it.

 S 348-035

 (3)  
Mix the parts of the Type I adhesive.

 (a)  
Put together only the quantity of the adhesive that is necessary.

 (b)  
Weigh the parts to get the correct ratio.

 (c)  
Use 100 parts of General Electric SR-529 adhesive to 4.5 parts of SC-3900 catalyst.

 NOTE: The pot life is 8 hours at 70°F.
____
 S 348-036
 (4)  
Mix the parts of the Type III adhesive.

 (a)  
Put together only the quantity of the adhesive that is necessary.

 (b)  
Do these steps to mix the Dow Corning adhesive: 1) Weigh the parts to get the correct ratio. 2) Use 100 parts of Dow Corning 93-076-1/2 or -2 resin to 10

 parts of catalyst.
 NOTE: The pot life is 2 hours.
____
 (c)  Do these steps to mix the RTV 700 adhesive:
 1) Select the correct catalyst.

 NOTE: Beta 2 catalyst will only let the adhesive flow
　
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