F85737 F85740
500 Application of Faying Surface Seal
Nov 01/75 Figure 201 51-31-0
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Application of Injection Seal 500
51-31-0 Figure 202 Nov 01/75
Page 206
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
6. Apply Hole and Slot Seal
A. Seal all tool and coordination holes that are not plugged with soft rivets because of
inaccessibility.
B. Overcoat rivets in absolute sealed areas with the appropriate sealant.
C. Apply hole filling compound to the pressure side of the hole (Fig. 203).
D. Back large slots and holes with masking tape.
E. Remove the tape after the sealant is formed.
F. Apply compound to the pressure side of the hole with spatula or suitable tool.
G. Pack compound firmly into space being filled.
H. Smooth the applied compound and feather into all contacting surfaces.
7. Apply Fillet Seal
A. Apply sealant with a Semco-type flow gun, or equivalent.
B. Point nozzle tip into the seam and maintain the line of travel.
C. Force a bead of sealant ahead of the nozzle tip (Detail A, Fig. 204).
D. Press sealant firmly into place with a fairing tool to obtain a shaped and smooth fillet (Detail B, Fig. 204).
E. Apply second application of sealant to produce a full bodied fillet (Detail C, Fig. 204). Second application of sealant is required only for integral fuel tank sealing.
NOTE: The nozzle tip may be cut and shaped to give a full bodied seal contour. For typical finished fillet dimensions see Detail D, Fig. 204.
F. Obtain final configuration by forming the fillet with a fairing tool.
G. Press tool against the sealant and move parallel to the bead.
NOTE: Care must be exercised so that folds, flaps and entrapped air are not created during working. Any evident air bubbles must be worked out. At completion of working, which must occur before end of work life, bead should have the shape of a faired fillet of approximately the proper size and be quite smooth.
8. Apply Fastener Seal
NOTE: Fasteners installed through a faying surface seal within the work life of the sealant need no further sealing.
A. Seal all fasteners installed through a faying surface seal after the sealant work life has been exceeded, and fasteners installed through a seal plane where no faying surface sealant is used, by one of the following methods:
(1) Install 5056 aluminum rivets wet with sealant only in aluminum structure. Extruded sealant shall be continuously evident to indicate adequate sealing (Detail A, Fig. 205).
NOTE: Install all other rivets dry unless you are told differently.
500
Jun 20/92 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 51-31-0 Page 207
F85748 F85753
Application of Fillet Seal 500
51-31-0 Figure 204 Nov 01/75
Page 208
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Application of Fastener Seal
Nov 01/75 Figure 205 51-31-0
Page 209
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(2)
Applying the sealant to the fastener after installation (Detail B, Fig. 205).
(3)
Filleting around fastener after installation (Detail C, Fig. 205).
B. Sealing of fasteners with metal seal covers.
(1)
Fill cover 1/2 to 2/3 full of sealant and press cover down over fastener until flange contacts structure.
(2)
Remove excess sealant from top of seal cover.
(3)
Fair out sealant around base of cover (Details D and E, Fig. 205).
NOTE: Sealant must be extruded continuously around the bottom of the seal cap. Avoid an excess of material around the cap.
9. Apply Aerodynamic Smoother
A. Remove all defective compound from the repair area and taper the remaining compound in order to produce a scarf joint (Detail A, Fig. 206).
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