(j)
Make an injection hole in the 1-1/2 inch wide masking tape at an applicable location.
(k)
Use the sealing gun to apply the sealant. Apply the sealant until it comes out from the flange of the bulkhead fitting.
(l)
Apply the sealant to make a fillet seal on the filler.
(m)
Apply the sealant on the fastener that is in the center of the filler.
(n)
Let the sealant cure for 16 to 24 hours.
(o)
Pull the string to remove the masking tape.
S 392-062-B00
(3)
Do the steps above to seal the multiple cutouts in the intermediate sealing areas. Do not use the coil spacers.
S 392-063-B00
(4)
Do the above steps to seal the single cutouts in primary or intermediate areas. Do not use the seal plate or filler.
TASK 51-31-00-392-064-B00
11. Fuel Seal Application
_____________________
A. References
(1) 28-11-00/801, Fuel Tanks - Approved Repair
B. Procedure
S 392-065-B00
(1) Seal the integral fuel tanks (Ref 28-11-00).
NOTE: The dry bay access panels are sealed with the "Fillet Seal
____ Application" and "Fastener Seal Application" tasks.
TASK 51-31-00-602-066-B00
12. Protection of Sealing Materials
_______________________________
A. Procedure
S 602-067-B00
(1)
Keep the sealing materials away from grease, oil, dirt, metal particles and all unwanted materials.
S 602-068-B00
(2)
After the sealant is tack-free, put a protective cover on the sealing area for protection.
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737-300/400/500MAINTENANCE MANUAL
TASK 51-31-00-392-069-B00
13. Accelerated Curing__________________
A. Equipment
(1)
Hot air blowers
(2)
Heat Lamps
B. Procedure
S 392-070-B00
(1) Use one of these steps to accelerate the cure:
CAUTION:_______MAKE SURE THE TEMPERATURE IS BELOW 120°F. IF THE TEMPERATURE IS ABOVE 120°F, BUBBLES WILL OCCUR ON THE SEALANT.
(a)
Use hot air blowers or heat lamps to apply heat to the sealant.
(b)
Make the airplane structure warm after you apply the sealant.
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A 737-300/400/500MAINTENANCE MANUAL
TABLE I
SEALANT ALTERNATIVES BMS 5-79
INITIAL MATERIAL ALTERNATIVE MATERIAL
CLASS B-8 CLASS B-4 CLASS B-2 CLASS B-1/2 BMS 5-79 CLASS D-2 CLASS C-24 CLASS C-48 BMS 5-95 BMS 5-16 CLASS B-1/2 CLASS C-80 CLASS C-20 NONE CLASS B-4 CLASS B-2
TABLE II
NOTES
THIS ALTERNATIVE IS NOT PERMITTED FOR MATING SURFACE SEAL, PRE-PACK SEALING, AND WET FASTENER INSTALLATION PROCEDURES.
YOU MUST APPLY A LAYER OF PRIMER BEFORE YOU APPLY THE SEALANT.
Alternative Sealants Data
Figure 207
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H87689
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737-300/400/500MAINTENANCE MANUAL
AIRFRAME DRAINAGE - DESCRIPTION AND OPERATION
_____________________________________________
1. General
_______
A. External drain holes and internal drain paths are provided to prevent water and other fluids from collecting within the airplane which could become a possible fire or corrosion hazard. Drain paths and drain holes must be inspected periodically to ensure they are clear of obstructions.
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