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When a fillet seal is required around the periphery of a fay sealed joint, it is not necessary to remove the sealant squeeze—out where the fillet is to be applied, provided that the material which was squeezed out has been shaped into a final configuration before the expiration of its application time. When the squeeze—out material has been shaped, a fillet seal can be applied over it without waiting for the squeeze—out to cure. If the squeezed out material was not shaped before the expiration of its application time, it shall be cured to a tack—free condition and then removed, by use of a plastic tool, from locations where a fillet is to be applied.
Immediately after the assembly is completed and all permanent type fasteners have been installed, remove
uncured sealant which extrudes onto the exterior of the aircraft using clean cloth moistened with solvent.
C. Pre—pack sealing
Sealant shall be applied to the gap or cavity in such a manner that no air is entrapped and the gap or cavity is abundantly filled with sealant.
Place parts in assembly position, then apply procedures of paragraph B.
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Validity : S / N 1 — 9999 20 00-09Page 206
(BA) OCT 97
D. Fillet sealing
Before fillet sealing, all permanent fasteners shall be installed and secured.
In using a sealant gun for fillet sealing, the nozzle tip shall be pointed into the seam or joint and shall be maintained nearly perpendicular to the line of travel. A continuous bead of sealant shall precede the tip, and the tip size, shape and rate of travel shall be such that sufficient sealant shall be applied to produce the required fillet.
Fillets shall be shaped or formed around the seam or joint using the nozzle tip or other filleting tool to press against the sealant while moving parallel to the bead. Exercise caution to prevent folds and entrapment of air during application and shaping of the fillet and work out any visible air bubbles. The fillet shall be formed so its highest overlap portion is centered over the edge of the structure. Lubrication in any form shall not be used for smoothing purposes.
The fillet may be applied in two stages. A small first fillet should be applied and formed as above, followed by a second application of sealant sufficient to form the final fillet.
— Fillet sealing of bolts and nuts shall be accomplished as per Figure 201. The area for sealing shall consist of the area of the structure surrounding the base of the fastener and from there up over the visible section of the fastener.
— Fillet sealing in fuel area shall be accomplished as per Figure 202.
E. Brush coating
Class A sealants should be applied to the joint side to be sealed. Brush coating is an appropriate method for rivets and anchor nuts.
Where brush coating is used as the method of sealing threaded fasteners, the sealant must be worked around each fastener with a stiff brush with considerable care. A simple pass of the brush with the sealant is not sufficient to produce an effective seal.
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TB20 MAINTENANCE MANUAL 20 STANDARD PRACTICES AIRFRAME TB20飞机维护手册 20 标准施工机体(51)
