MIL-PRF-27639D
3.2
First article. When a first article is specified (see 6.2 and 6.4) it shall be subjected to first
article inspection in accordance with 4.5.
3.3
Age. Unless otherwise specifically approved by the procuring activity, all materials and
component parts used in the inflator valve shall have been manufactured not more than 12 months
prior to the date of delivery to the Government.
3.4
Materials. All materials shall be suitably treated to resist corrosion due to electrolytic
decomposition, fungus, salt spray, and any other environmental conditions that may be
encountered during operational use or storage. Cadmium and other materials identified as
pollutants by the Environmental Protection Agency (EPA) should be avoided where possible.
3.5
Recycled, recovered, or environmentally preferable materials
. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided that
the materials meet or exceed the operational or maintenance requirements, and promote
economically advantageous life cycle costs.
3.6
Operation. The pneumatic inflator valve shall be capable of being easily operated in any
world-wide environmental conditions that may be encountered by aircrew personnel. The unit
shall function easily when activated by personnel wearing all types of flight gear.
3.7
Housing. Housing shall be of any material that is currently accepted in industry for life
support items.
3.8
Components.
3.8.1 Inflator valve The inflator valve discharge mechanism shall consist of an external lever
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and an internal piercing pin and shall have a seal that will prevent leakage of pressure from the life
preserver cell when the lever is in the operated (locked) position. The inlet shall be threaded to
accept a carbon dioxide (CO) cylinder conforming to MIL-PRF-25369. A locking mechanism
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shall be provided to retain the COcylinder in the inlet. An outlet shall be provided to mount the
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inflator valve on the valve stem of the preserver cell.
3.8.2 Actuating lever All edges of the lever and the case depth shall have a radius of 0.010
.
inch. The lever shall be 0.1094 inch thick and shall be held in a stationary position while in
operation. In the unoperated position, the lever shall lay against the side of the inflator valve,
recessed in the housing.
3.8.3 Piercing pin The piercing pins shall have a case depth of 0.010 inch and shall be
.
manufactured of a material that is currently recognized for life support items. A seal shall be
provided to prevent leakage of the pressure from the life preserver cell after the piercing pin has
been retracted.
3.8.3.1 Piercing pin spring A piercing pin spring shall be provided to retract the pin immediately
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from the opening of the punctured COcylinder.
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