500  Drain Valve Installation 
Feb 20/90  Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  51-41-13 Page 401 

PHENOLIC AND STAINLESS STEEL RUB PADS - APPROVED REPAIRS
1. General

A.  This document describes the process to be used for bonding laminated phenolic or stainless steel rub pads to the airplane structure.
B.  BMS 5-26 is a two component material suitable for application by sealant gun or spatula.
C.  BMS 5-26 component materials shall be stored in clean air-tight metal containers at room temperature (60° to 90°F).
D.  BMS 5-26 may be stored in the mixed state in refrigerators as follows:
(1)  
The material shall be prepared per paragraph 2.C.

(2)  
The mixing operation shall be performed in designated sealant mixing areas only by personnel certified for mixing.

(3)  
The mixed material shall be stored at a temperature no higher than -20°F.

(4)  
The mixed material shall be packaged in sealant gun tubes or aluminum toothpaste type tubes. Each container so stored must contain the following information:

(a)  
Manufacturer's name, product designation

(b)  
BMS designation and class

(c)  
Manufacturer's batch number

(d)  
Date of mix and expiration date of usage. 1) Material stored at a temperature of -40°F or lower shall be rejected if not used within 14 days after mixing. 2) Material stored at a temperature of -30°F or lower shall be rejected if not used within 10 days after mixing.

3)  Material stored at a temperature of -20°F or lower shall be rejected if not used within 7 days after mixing.

(e) 
 Mix number.

(f) 
 Mixer's identification.

500 
May 15/69  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  51-51-11 Page 801 

2.  Repair Bonded Rub Pads to Design Standards
A.  Equipment and Materials
(1)  
Adhesive, BMS 5-26, Class B-1/2 (optional: B-2)

(2)  
Clean cloth, gauze, cheesecloth

(3)  
Solvent

(a) 
 Naphtha, Toluene

(b)  
Solvent – Final Cleaning of Metal Prior to Non-structural Bonding (Series 88) (Ref AMM/SOPM 20-30-88)

(4)  
Abrasives

(a)  
Paper, 100 grit size or finer

(b)  
Scotch-Brite aluminum oxide, very fine, type A

(5)  
Cotton or rubber gloves

(6)  
Soft bristle brush

(7) 
 Serrated spreader

(8) 
 Clean roller

(9)  
Hardwood or plastic wedge

B.  Preparation of Faying Surfaces
(1)  Cleaning of Laminated Phenolic Rub Pads
(a)  Precleaning 1) Remove any loose soil, excess grease or oil by wiping with a clean cloth. Care should be taken not to smear soils over any larger surface than necessary.
2)  Solvent clean the surface by wiping with a cloth dampened with naphtha. Wipe off solvent with a clean dry cloth while the surface is still wet.
500 
51-51-11 Page 802  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/98 

3)  Light sanding (100 grit size or finger) is required to remove the gloss from the faying surface. Care should be taken to ensure the gloss is completely removed from all edges and corners. Sand with circular overlapping strokes or with a combination of lengthwise and crosswise strokes. Remove the dust by wiping with a clean cloth.
(b)  Hand Cleaning 1) Apply naphtha solvent to surface by dispensing from squirt or squeeze type bottles. Do not dip the cloth in the solvent containers. 2) Rub the surface with gauze or cheesecloth until the major portion of soil is removed. 3) Exchange soiled cloths for clean ones frequently. Use clean cotton or rubber
gloves. 4) Wipe off solvent with a clean, dry cloth while the surface is still wet. 5) Repeat above operations until cleaning cloths show neither soil nor yellow
discoloration from the phenolic. This procedure shall be performed no more than 1 hour prior to the application of the adhesive.
(2)  
Cleaning of Unprimed Stainless Steel Rub Pads

(a)  
Remove any loose soil, excess grease or oil by wiping with a clean cloth. Care should be taken not to smear oils over any larger surface than necessary.

(b)  
Solvent clean the surface by wiping with gauze or cheesecloth dampened solvent, Series 88 (Ref AMM/SOPM 20-30-88).
　
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