S 492-110
(7)
If you cannot install the permanent fasteners before the pot life of the sealing compound ends, use temporary fasteners to hold the parts together until the sealing compound dries.
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747-400 MAINTENANCE MANUAL
S 392-111
(8)
Install the permanent fasteners with the new sealant. Apply the sealant on the fastener or in the hole.
S 212-112
(9)
Remove the unwanted sealant.
(a) Make sure the faying (mated) surface and the squeeze out is approximately 0.06 inch along the joint.
S 432-043
(10) Assemble the parts when the parting agent is sufficiently dry to touch.
TASK 51-31-01-392-044
5. Injection Seal Application__________________________
A. Equipment
(1) Sealing gun and nozzles
B. Procedure
S 302-045
(1) Do the Prepare for Sealing task.
S 392-046
CAUTION: DO NOT CAUSE A BLOCKAGE WHEN YOU APPLY SEALANT NEAR OR AROUND
_______ THE FUSELAGE DRAIN HOLES, TUBES, OR PATHS. THE FUNCTION OF THE DRAIN HOLES IS TO DRAIN CONDENSATION AND FLUIDS OVERBOARD. IF YOU CAUSE A BLOCKAGE, FLUIDS WILL COLLECT IN THE AIRPLANE. THE FLUIDS CAN CAUSE CORROSION TO THE STRUCTURE, OR A FIRE IF THE FLUIDS ARE FLAMMABLE.
(2) When a continuous seal is necessary, put a finger or a spatula on one end of the hole to stop the flow of the sealant (Fig. 202).
S 392-047
CAUTION:_______DO NOT FULLY EMPTY A FLOW GUN. ALWAYS APPLY THE SEALANT FROM ONE DIRECTION. DO NOT SEAL A SURFACE FROM THE TWO ENDS OF A HOLE. AIR POCKETS AND POSSIBLE LEAKS IN THE SEAL CAN OCCUR.
(3) Put the sealant into one end of the hole with a flow gun until the sealant comes out from all other openings.
NOTE: When an opening is to be closed only for support of the
____ sealant, it is not necessary to apply the sealant to the full depth of the opening.
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747-400
MAINTENANCE MANUAL
NOTE: "A" = 0.25 INCH MINIMUM, BUT NOT LESS THAN "W".
HOLE FILLING HOLE FILLING
THE INJECTION SEAL IS COMPLETE WHEN THE SEALANT GOES THROUGH TO THE OTHER END USE YOUR FINGER OR A SPATULA TO STOP THE FLOW OF THE SEALANT AT THE OTHER END THE SEALANT MUST FULLY FILL THE SLOT
Injection Seal
Figure 202
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747-400 MAINTENANCE MANUAL
S 392-048
(4) When you apply the sealant at the bottom of the slot, make sure you fill the slot. Make sure you get a continuous seal with the bottom and sides of the slot.
TASK 51-31-01-392-049
6. Hole and Slot Seal Application______________________________
A. Equipment
(1)
Spatula made of wood or plastic
(2)
Sealing gun and nozzles
B. Consumable Materials
(1) G00138 Masking Tape - Permacel No. 70 or 85,
American Tuck No. 210
C. Procedure
S 302-050
(1)
Do the Prepare for Sealing task.
S 392-094
(2)
Apply the sealant on all the tool and coordination holes that are not riveted (Fig. 203).
S 392-051
(3)
Apply the sealant on the rivets in fully sealed areas.
S 392-052
(4)
Apply a hole filling compound to the pressure side of the hole.
