(2)
Pull nylon rods from diaphragm seal retainers (Section A-A).
500
May 01/00 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-09-141 Page 401
Diaphragm-Mechanical Door Seal Installation 500
52-09-141 Figure 401 (Sheet 1) May 01/00
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Diaphragm-Mechanical Door Seal Installation
Feb 15/68 Figure 401 (Sheet 2) 52-09-141
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
D. Pull and roll mechanical seal and remove from retainer around the door edge (Section B-B).
E. Remove diaphragm - mechanical seal from door structure.
4. Prepare Surface for Seal Installation
A. Remove old sealant from seal locations on door structure.
B. Remove any loose soil, grease or oil with a clean gauze or cheesecloth.
C. Apply solvent, Series 88 (Ref AMM/SOPM 20-30-88) to surface by dispensing from squirt or squeeze type bottles. Do not dip the cloth in the solvent container. All cleaner shall be wiped off, while wet, with a clean dry cloth.
WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIRMENTS FOR PROPER HANDLING PROCEDURES.
D. Rub the surface until soil is removed. If necessary, scrub with a soft bristle brush to remove difficult soils.
E. Exchange soiled cloths for clean ones frequently.
F. Repeat cleaning operations until cleaning cloth shows no soil.
G. Let surface dry.
5. Install Diaphragm - Mechanical Seal
A. Correctly position seal around door periphery with lip of seal facing outboard with approximately equal stretch along entire length of seal.
NOTE: Seal is marked TOP and BOTTOM along upper and lower edge of seal.
B. Install upper and lower diaphragm seals (Fig. 401, Section A-A).
(1)
Insert edge of diaphragm seal into seal retainer.
(2)
Inject Dow Corning Q3-0121 seal between mechanical seal and seal retainer, approximately 1.50 inches long, centered on door centerline. Force seal into gap as far as possible (seal lower retainer of both gates only).
(3)
Apply liquid soap lubricant to nylon rods.
(4)
Insert two nylon rods, one from each end of retainer to form a butt fit at center of seal retainer.
(5)
Similarly insert two rods in other diaphragm seal retainer.
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C. Install mechanical seal (Fig. 401).
(1)
Install the inboard edge of mechanical seal attachment flange into seal retainer.
(2)
Using the door seal installation tool, SE52-1002, push the outboard edge of mechanical seal into seal retainer.
NOTE: If necessary, remove portions of mechanical seal and refit to remove any stretch that may have occurred during initial positioning.
D. Apply silicone sealant to diaphragm seal.
(1)
Apply a uniform layer of sealant over the entire end of each diaphragm seal nylon rod retainer, pin and diaphragm as shown in detail A. Overlap well onto diaphragm. Fair sealant smooth. The sealant forms a surface skin a few minutes after it is applied so fairing should be done immediately after application. The fairing tool may be kept wet with solvent to assist in fairing.
(2)
Allow the sealant to cure for a minimum of 24 hours at 75°F and 50% relative humidity. Lower temperatures and humidity will slow the rate of cure. The cure rate can be accelerated by circulating warm humidified air (140°F maximum) over the sealant.
E. Install bolt connecting each gate to its respective control rod (section A-A).
F. Close the door and check from inside that seal lip bears correctly on inner face of body skin.
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