MIL-S-6144A
Stability - The installation shall be designed to resist changes in
3.4.1
form, dimensions, and appearance during handling, installation and service. Sufficient
support and containment shall be afforded to prevent disintegration or packing of the
insulating material due to vibration. The rigid lining material of the Type III
installation shall be of the type that will not crack or craze when subjected to the
vibration of its environment.
3.4.2
Moisture Resistance - A moisture impervious material shall be
provided as a backing material to the installation and shall conform to the requirements
specified in MIL-P-6264. Alternately, in Type III Installations utilizing rigidized
insulating material, moisture resistant material may be sprayed on the rigidized
insulating material.
3.4.3
Hydraulic Fluid, Oil, and Fuel Contamination - Sections of an
installation having porous or perforated interiors shall not be used in areas subject
to hydraulic fluid, oil, or fuel contamination. Sections of an installation located in
these areas shall be protected from damage by completely enclosing the insulating
material within the section with material impervious to, and unaffected by, these
agents. Holes made in these sections by stitching, for fastening or otherwise,
shall be sealed against fluid entry. The requirements of 3.4.2 are waived in these
sections of an installation.
Corrosion and Toxicity - The component materials of the
3.5
installation and the appurtenant materials used to fasten, support, seal, protect or
otherwise used in the construction of the installation shall not themselves corrode,
nor propogate corrosion of any aircraft material which they contact, nor emit corrosive
vapors which will damage any portion of the aircraft. The component and
appurtenant materials used in the installation shall be of the type which will not
emit toxic or noxious vapors in concentrations that will hinder the efficiency or
comfort of the aircraft occupants,
3.6
Fire Resistance - The individual components of the Type II and
III Installations shall meet the fire resistance requirements of MIL-I-7171.
3.7
Damage due to Cargo and Personnel - In the design of the
thermal-soundproofing installation due consideration shall be given to the
damageability resultant from cargo handling, flight and maintenance personnel
abuse.
3.7.1
Aircraft intended for cargo transport shall contain installations
which are protected to withstand snagging? tearing and puncturing by cargo handling.
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