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747-400 MAINTENANCE MANUAL
(c)
Immediately dry the surface with a clean dry cheesecloth.
(d)
Lightly rub the clad surface with Scotch-brite sheets until the mating surface is not shiny.
(e)
Remove the remaining particles with a clean cheesecloth.
NOTE: Do not use solvent to remove the remaining particles.
____
(f)
Rub the surface with a cheesecloth that is moist with BMS 11-7 solvent until all of the remaining particles are removed.
(g)
Immediately dry the surface with a clean cheesecloth.
(h)
Clean the surface again, if it is necessary.
S 118-005
(4) To clean the metal surfaces that have BMS 10-11 primer applied, do these steps:
NOTE: It is not necessary to clean the metal surfaces if the
____ BMS 10-11 primer was applied less than 6 hours before.
(a)
For surfaces that have the primer applied between 6 and 48 hours, clean the surface with a cheesecloth that is moist with naphtha.
(b)
Immediately dry the surface with a clean cheesecloth.
(c)
Clean the surface again, if it is necessary.
(d)
For surfaces that have the primer applied for more than 48 hours, clean the surface with a cheesecloth that is moist with BMS 11-7 solvent.
(e)
Immediately dry the surface with a clean cheesecloth.
(f)
Clean the surface again, if it is necessary.
D. Apply the Adhesive
S 118-029
(1) Do these steps to apply the adhesive on the mating surface.
(a)
In less than 1 hour before you apply the adhesive, make sure all the surfaces are clean.
(b)
Remove the rub pads with a hardwood or plastic wedge.
(c)
Use heat lamps to make the adhesive soft.
NOTE: Do not apply heat at a temperature of 190°F or more.
____ Use a thermocouple to measure the temperature.
(d) Remove the remaining adhesive from the surface with a hardwood or plastic wedge.
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MAINTENANCE MANUAL
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. SOLVENTS MAY BE
FLAMMABLE 0R HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT
MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS
FOR PROPER HANDLING PROCEDURES.
(e)
Clean the area with a clean cheesecloth that is moist with solvent, Series 88 (AMM 20-30-88/201).
(f)
Immediately dry the area with a clean dry cheesecloth.
(g)
Refer to the manufacturer's instructions to mix the base component and the curing agent. Make sure the mixture is smooth and constant. Keep air bubbles to a minimum when you mix the components.
NOTE: Class B-2 sealant has a pot life of 2 hours and
____ class B-1/2 has a pot life of 1/2 hour at 70°F. Keep the components that were not mixed in clean, airtight metal containers. Keep the mixed components at -20°F or lower. If the mixture is kept at temperatures between 20 and 30°F, the mixture has a pot life of 7 days. If the mixture is kept at temperatures between -30 and -40°F, the mixture has a pot life of 10 days. If the mixture is kept at temperatures below -40°F, the mixture has a pot life of 14 days.
CAUTION: DO NOT APPLY ADHESIVE IF THE TEMPERATURE OF THE STRUCTURE
_______ IS BELOW 50°F. AT TEMPERATURES BELOW 50°F, THE PERFORMANCE OF THE ADHESIVE IS UNSATISFACTORY.
(h) Apply a thin constant layer (approximately 50 grams for each square foot) of the mixture on each mating surface.
NOTE: Use a spreader that has serrations to apply the adhesive
____ on a large mating surface.
(i)
Make sure the adhesive has a sufficient thickness to let the adhesive flow around the edges of the rub pad when the cure pressure is applied.
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