MIL-S-6144A
3.2.1
Fastening - Type I Installation
3.2.1.1 Fastening shall be principally to the existent structure with
auxiliary support structure provided {such as brackets, crown rails, lattice webbing,
etc.) if needed to minimize sag, maintain contours or to facilitate removal and
replacement.
3.2.1.2 Curtain and snap fasteners shall be used to attach and support
the thermal-soundproofing blanket. (See Figure 1 for typical installation).
Fasteners shall be attached to the blanket only in areas which have been
reinforced by the use of a durable and entirely suitable edging material cemented
or stitched to the trim cloth, or by the use of large metal grommets.
3.2.1.3 Nylon tape fasteners may be used in lieu of curtain and snap
fasteners when configurational details, such as blanket size and weight, and the
type of available structure permit. A means for positive positioning of the
thermal-soundproofing blanket fasteners shall be used in conjunction with nylon
tape fasteners. This may be accomplished by providing several plain studs in
the structure with corresponding grommets in the blanket or, as typified in
Figure 4, by locating several curtain, quick release fasteners in the thermal-
soundproofing blanket.
3.2.1.4 Interlocking slide fasteners shall be used for sealing local
inspection openings, stowage packets, or inflight equipment access openings,
within the installation. Alternate nylon tape fasteners or snap fasteners may be
used if provision is made for adequate support around the access cutout behind
the thermal-soundproofing blanket.
3.2.1.5 Fasteners intended for permanent installation such as screws,
bolts, rivets, staples and snap pins shall not be used to attach and support the
thermal-soundproofing blankets. Adhesive shall not be used to fasten the blanket
to the aircraft structure, but may be used to fasten the blanket to another part of
the installation which is separately attached and supported. The adhesive shall
conform to MIL-A-3316.
3.2.1.6 Sufficient slack shall be inherent in the thermal-soundproofing
blankets between fastening points such that stretching will not be necessary to
position and fasten the blankets upon installation. Sag shall be prevented in the
installation by optimum choice of fastener number and location, and by the use
of auxiliary support methods (e.g. blanket support tabs, tufting, etc.), if necessary.
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