MIL-S-6144A
3.2.2 Fastening - Type II Installation
3.2.2.1 The general requirements for fastening shall be as specified in
3.2.1.1. Curtain or snap fasteners shall be used to attach the flexible trim material
to the aircraft structure. Fastener attachment shall only be made in areas in which
the trim cloth is specifically reinforced by the use of a durable and entirely suitable
material cemented or stitched to the trim cloth.
3.2.2.2 Nylon tape fasteners may be used in lieu of curtain and snap
fasteners, when practicable, if the positioning requirements of 3.2.1.3 are
satisfied. Figure 4 illustrates a typical installation.
3.2.2.3 Rigidized insulating material should be configured such that it
is substantially self-supporting and held in place with a minimal number of fasteners.
3.2.2.4 Lacing may be used to retain the insulating material between
frames where required. The lacing cord may be anchored at frame and stringer
intersections by running the cord behind the frame and over the stringer section.
or may be anchored to hooks fitted to the frame webs. The lacing cord shall not
be threaded through holes made in the frame webs.
3.2.2.5 Provision shall be made within the installation for access to
areas affected by inspection or maintenance procedures. The size of the section
of insulation to be removed shall be as small as practicable, and contain the
minimum number of fasteners. Due consideration shall be given to access
requirements in confined areas. and the fastening method used therein shall
permit removal and replacement with one-hand operation.
3.2.2.6 Fasteners intended for permanent installation such as screws,
bolts, rivets, staples and snap pins shall not be used as fastening means for the
trim cloth or rigidized insulating material. Adhesive conforming to MIL-A-3316
may be used for fastening the rigidized insulating material to the trim cloth,
which is separately attached to the structure, but shall not be used for attaching
and supporting the insulating material to the structure.
3.2.3
Fastening - Type III
3.2.3.1 Fastening shall be principally to the existent structure with
auxiliary structure support and positioning structure provided to maintain the
contours of the aircraft and facilitate removal and replacement.
3.2.3.2 Curtain. snap and quarter-turn fasteners shall be used to attach
the rigid lining material to the aircraft structure.
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