(c)
Clean the surface with a clean brush and gauze pads soaked with Series 93 solvent (AMM 20-30-93/201).
NOTE: The area you clean must make an overlap with the
____ adjacent area. Make the total area a minimum of two times as large as the area you apply the sealant to.
(d)
Rub dry with a clean, dry gauze pad.
(e)
Continue to clean and dry the surface until the dry gauze pad stays clean.
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747-400 MAINTENANCE MANUAL
S 218-238
(7) Make sure that all fasteners in the sealant repair area are installed and tightened, unless you must install the fastener after you apply the faying surface sealant.
NOTE: You cannot install and tighten most fasteners after you
____
apply the sealant.
S 118-239
(8)
If the alodine metal surface treatment is worn or damaged, you must apply an alodine coating, BAC5719, Type II, Class A (MIL-C-5541, Class A), to the metal surface before you apply the new sealant or finish material.
(a)
Refer to the Alodine Metal Surfaces procedure to apply alodine to the surfaces that are worn, damaged or where metal shows (AMM 28-11-00/701).
S 118-241
(9) Immediately before you apply the sealant, clean the surface with BMS11-7 solvent and rub dry.
NOTE:____Do not let the solvent dry on the surface. Do not touch the area with your fingers.
G. Prepare the Sealants
NOTE:____It is very important to mix, use and keep sealants correctly. You must follow approved procedures to prevent damage or injury. Fully mix all components, refer to the manufacturer's instructions. Do not mix sealants that you apply with a brush until you use them. Do not put thinners in the sealant. Keep the sealants covered when not in use.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
S 398-261
CAUTION: MAKE SURE THE NEW SEALANT AND SURFACE FINISH THAT YOU USE IN
_______ THE FUEL TANK ARE RECOMMENDED MATERIALS. IF THE MATERIALS ARE NOT COMPATIBLE, DAMAGE TO THE FUEL TANK CAN OCCUR.
(1) Make sure the sealant and finish material are compatible.
NOTE: This procedure contains information on how to prepare, use
____ and cure the sealant materials. The sealant and finish materials recommended for use in this procedure and in AMM 28-11-00/701 can be used with each other (mutually compatible). Do not apply sealant over an old primer coating unless you know the primer is compatible with the new sealant.
S 398-242
CAUTION:_______DISCARD ALL SEALANT THAT DOES NOT APPLY SMOOTHLY. INCORRECTLY APPLIED SEALANT COULD CAUSE LEAKAGE.
(2)
Follow these steps for sealant compound that is not mixed:
(a)
Keep the sealant at temperatures between 50° to 80°F (10° to 26.7°C).
(b)
Do a test of sealant that is kept for 6 months or more.
(c)
Mix a sample of the sealant base material and the curing compound in a container, at room temperature.
(d)
Apply a fillet seal to a sample piece of structure to find the time necessary before a sample of the sealant is not tacky.
(e)
Compare this time with maximum permitted tack-free time given in the applicable sealant specification.
(f)
If this time is more than the maximum permitted time, discard the sealant.
S 398-243
(3) Mix the sealant compound: WARNING: MAKE SURE THERE IS A GOOD FLOW OF AIR IN THE AREA THAT YOU
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