MIL-PRF-49064E
stabilization. Validation of operation shall be observance of a green glow at the
eyepiece at operating temperature and, at low operating temperature, the ability to
operate all controls with arctic gloves or equivalent
3.7.2 Vibration. The sight shall not be damaged (see 3.10.1) after being
subjected to simple harmonic motion having an amplitude of 0.015 inch (0.030 inch
total excursion) with the frequency being varied between 5 and 55 Hertz (Hz).
Operation of the sight during vibration shall not be required. Vibration shall be
applied in 3 mutually perpendicular planes, one of which is perpendicular to the
optical axis. The duration of vibration shall be 5 minutes in each plane. The test
after vibration shall be resolution (3.6.3).
3.7.3 High intensity shock. The sight shall not be damaged (see 3.10.1) by a
sequence of 3 shocks applied in each direction along each of 3 mutually
perpendicular axes (horizontal, vertical, and optical axis when the reticle pattern
is erect) with the sight in the non-operating mode. The shocks shall be half sine
pulses and shall have a time duration of 4 milliseconds, ±5 percent. Shock pulses
applied along the axes horizontal and perpendicular to the optical axis shall have a
peak amplitude of 50 g's
±15 g's (see 3.10.3). Shock pulses applied along the optical axis shall have a peak
amplitude of 100 ±15 g's (see 3.10.3).
3.7.4 Altitude. The sight shall not be damaged (see 3.10.1) when operated at
a pressure equivalent to 10,000 feet altitude above sea level. The sight shall be
operated for a period of 3 hours. Validation of operation shall be observance of a
green glow at the eyepiece.
3.7.5 Humidity. The sight shall not be damaged (see 3.10.1) after being
operated in an atmosphere with a relative humidity of 95 ±5 percent over a
temperature range of +20°C to +52°C and shall operate after storage up to +68°C
minimum with 95 ±5 percent relative humidity.
3.7.6 Immersion. The sight shall not be damaged (see 3.10.1) after being
immersed in fresh water to a depth of not less than 3 feet for a period of not less
than 30 minutes. The sight shall be pre-conditioned by exposure to temperature of
+45°C ±3°C for a period of 2 hours prior to being immersed in the fresh water at a
temperature of +18°C ±5°C. The sight shall be inspected, without opening, for
evidence of leakage.
3.7.7 Interchangeability. The objective lens assembly and the eyepiece lens
assembly shall be physically interchangeable between sight assemblies without
degradation of the resolution (see 3.6.3), eyepiece diopter focus (see 3.6.6.1), and
range focus (see 3.6.6.2) requirements. These interchanges shall be made without
any modification or adjustment beyond that necessary during replacement of any of
the parts or assemblies involved.
3.8 Marking. Marking shall be in accordance with applicable drawings unless
otherwise specified in the contract.
3.9 Workmanship. Standards of workmanship shall be such that the sight will
meet all requirements of this specification and any referenced specifications or
drawings.
3.10 Technical interpretations. The following technical interpretations, when
referenced in section 3 and 4, are mandatory for this specification.
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