MIL-PRF-26542/12C
REQUIREMENTS:
Component parts:
Shall be in accordance with figure 1.
Release button:
Shall be recessed to prevent obstruction and inadvertent release of connector.
Bracket rod:
Shall be bent to 90 ± 2 degrees at the microphone-element end, as shown in
figure 1, to provide a complete adjustable range of the element when installed in
the oxygen mask. The rod shall be built from a high-strength, corrosion-resistant
material meeting the requirements of MIL-PRF-26542, such as stainless steel.
Microphone block: Screw-receiving sections. The material which receives the mask installation
screws (see figure 1, "detail, microphone bracket", shaded portions) shall prevent
breakage and screw slippage, having a single metal section enclosing and
connecting the two screw-receiving sections. The metal shall be either nickel-
plated brass, or another material with equivalent or superior strength, corrosion-
resistance, and adherence to the requirements of MIL-PRF-26542. The design
shown in figure 1 (detail, microphone block) shall be used, or a design which
meets or exceeds its performance without introducing mask damage or other
hazards to the user, upon approval from the qualifying activity.
Interface to oxygen-mask material. The bracket shall be designed to prevent
damage to the oxygen mask material, to which it is secured in use. This shall
include damage resulting both from: (a) torque stresses on the element
resulting from pilot imposed forces such as adjustments to the microphone
element orientation, or pull forces from associated cable and hose assemblies
during normal head motion, and (b) possible compression of the mask facepiece
due either to altitude pressure changes, or intentional squeezing of the nose
section as a result of the periodic need to clear sinus cavities during use.
Pass-through connector: The connector shall include two gaskets; (1) A 0.031 (ref) thick gasket,
"Bosch Security Systems Inc." PIN 3872 or equivalent (see figure 1 and note 7),
covering the mask interface surface, which provides an airtight, slip resistant
seal, such as silicon rubber, meeting the performance requirements of MIL-PRF-
26542. (2) A Mylar gasket, "Bosch Security Systems Inc." PIN 38872 or
equivalent (see figure 1 and note 8), to be used between the internal surface of
the mask and the microphone block to prevent cutting from the block edge.
Unsafe materials:
Parts and adhesives, which install inside the mask, and which may become
detached during normal use and thus create an ingestion hazard, or which
otherwise present a chemically toxic hazard to the user, shall not be used.
Hardware:
The product shall be supplied with 2 stainless steel screws for securing the pass
through connector to the microphone block. The screws shall be type 2-56 UNC
X one half inch (½) fillister head, slotted, for interchangeability of spares.
Color:
In accordance with MIL-PRF-26542, with the exception that metal components
shall not have surface coloring, but shall retain their natural appearance.
Weight:
Twenty two (22) grams, maximum.
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