A-A-55202A
2.2.3 Suspension/retention assembly. The suspension/retention assembly shall include a
headband and a sweatband. The headband shall be adjustable in 1/8 inch increments. The
minimum size range shall be 6-1/2 to 8 (standard commercial designation) and shall be
obtainable by the use of one or more headbands. The size range and adjustment points shall
be marked on the headband in a permanent and legible manner. The surface of the headband,
in contact with the wearer's head, shall not be less than one inch wide. The headband(s) shall
be removable and replaceable. The sweatband shall cover the forehead portion of the
headband. When the headband is adjusted to the maximum size, the sweatband shall not
contact the helmet shell, and the headband shall not contact the helmet shell, except at the
attachment points. Crown straps, if provided by the contractor's design, shall be adjustable
for proper fit and maintain proper head height. All materials coming in contact with the
wearer's head shall be non-irritating to normal skin. The color of the chinstrap and sweatband
shall be as required by the procurement activity. The suspension retention assembly shall be
tested for the following:
2.2.3.1 Suspension/retention assembly test. The suspension/retention assembly shall be
tested in accordance with the following: The average minimum force required to separate the
suspension assembly from the helmet shall be not less than 15 pounds (6.8 kg). The
minimum force required to separate any individual attachment point of the suspension
assembly from the helmet shell shall be 10 pounds (4.5 kg). The assembly shall be positioned
and secured so that all attachment points of the suspension assembly are on a horizontal
plane. Each attachment point of the suspension assembly to the helmet shell shall be tested
by slowly applying a pull force in the direction required to release the mechanism with
sufficient force to separate the attachment point from the helmet shell. Suggested techniques
for applying the loads are shown in Figure 2. The force gauge shall be accurate to 0.25
pounds (0.1 kg). Care shall be taken to apply the pull force through the centerline at each
attachment point. If the pull force is applied at any other angle the test results shall be
unacceptable and the test shall be repeated. The individual and the average force shall be
reported. Failure of the suspension assembly retention system to meet above requirements
shall constitute failure of the test. For each sample unit a determination shall be made for
each attachment point of the suspension assembly to the helmet shell and a determination of
the average of all the individual determina- tions.
2.2.4 Energy absorbing system. The energy absorbing system shall be such that the helmet
shall meet the design and performance characteristics specified herein and NFPA Standard
1972 except as follows:
a. From NFPA, exceed requirements in paragraphs, 4-1 and 4-1.1, Top Impact
Requirement/Force Transmission (See subparagraph c for desired requirement values).
b. From NFPA, paragraph Top, Front, Side, and Back Impact Requirement-Acceleration,
add: "The helmet shall show no evidence of cracking or fracture as a result of impact
testing."
c. The maximum acceleration for the top impact location shall be 150 X Gn, 1475.5
m/sec/sec; 4830 ft/sec/sec in lieu of the specified requirements.
2.2.4.1 Impact-acceleration/Impact resistance of face shield. The requirement for impact-
acceleration/impact-resistance shall be as specified in NFPA-1972, except as changed in
subparagraphs b and c of paragraph 2.2.4. Testing for impact-acceleration shall be in
accordance with NFPA-1972 except that the top impact site shall be within a 2-inch (51 mm)
radius from the intersection of the midsagital plane and the bitragion-coronal arc extended to
the surface of the helmet. The front, rear and side impact centers shall be 1 +1/2, -0 inches
(25 +13, -0 mm) above the reference plane. The test anvil shall be steel. The striking face
shall be a spherical segment with a radius of 1.9 + 0.3 inches (48 + 8 mm). The test shall be
considered a failure if one or more impact-acceleration tests exceeds the maximum
2
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business