(3)
Type III is good adhesive to use for fast repairs. It has two parts and dries in the air or below a plastic film. It is very flexible. Do not put force on the adhesive until after 24 hours. Dow Corning 93-076-1/8 adhesive, General Electric RTV 700 and General Electric RTV 430 are Type III adhesives.
(a)
To get accelerated cure times with Dow Corning 93-076 and General Electric RTV 430 adhesives, you may use contact pressure. Cure under contact pressure at approximately 180 degrees F (82 degrees C) for 4 hours minimum or at approximately 200 degrees F (93 degrees C) for 2 hours minimum before you handle parts.
NOTE: For small areas, a heat lamp is recommended to
____ accelerate adhesive cure times.
(4)
The times to dry the adhesives are correct for temperatures of 75 |5°F with 50 |5% relative humidity. If the temperature or the humidity decreases, the time will increase.
(5)
Try to make repairs to the seals with the easiest access to the seal and with minimum force. You can remove one or more sections of the retaining strip to work on the damaged area. To repair the joint on a seal, you must disengage the gates to remove tension from the seal.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
BULB SEAL
Pressure Seals (Example)
Figure 801
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
TASK 52-09-10-308-001-B00
2. Door Seal Repair
________________
A. General
(1)
The adhesives must be in good condition. These instructions will help keep the adhesives in good condition.
(a)
Keep the adhesives at 40 to 50°F until you use them.
(b)
You can keep small stacks of adhesives (to use in the shop) at room temperature (60 to 80°F) for a maximum of 6 months.
(c)
Always keep the Type II adhesives sealed when they are not used.
(2)
A repair to a seal usually occurs in this sequence.
(a)
Make sure you have easy access to the seal. It will make the repair easier if the seal is not stretched. If necessary, remove the seal retaining strips. Disengage the gates to release the tension on the seal.
(b)
Make a decision on the type of repair necessary and the applicable repair procedure. Use fabric when possible. Replace the seal if there is too much damage to repair.
(c)
Clean and prepare the surfaces that you will repair.
(d)
Apply the adhesive to the two surfaces to be bonded, and hold the parts together in the correct position.
(e)
Obey the pot life limits of the adhesive.
(f)
There are three general repair procedures as follows:
1) Procedure A. This procedure uses only adhesive to repair the damaged seal. a) Apply the adhesive to all areas that you will bond. b) Hold the surfaces together and apply pressure to make
sure all parts are fully bonded. c) Let the adhesive dry for the necessary time before the seal is used.
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 all parts are fully bonded. g) Let the adhesive dry for the necessary time before the
seal is used.
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