Dewie38
Active member
- 152
- 189
- 43
- Location
- Milford Ct
MEP8XX Series
3.9 Environmental requirements.
3.9.1 Starting and operating. The set shall start and operate under each and any
combination of the following operating conditions:
a. All possible relative humidities, with ambient temperatures ranging from -32 to
49 °C (-25 to 120 °F) at sea level; and from -32 to 35 °C at 1,219 m (-25 to 95 °F at
4,000 feet). The high temperature requirement remains at 35 °C (95 °F) at altitudes
above 1,219 m (4,000 feet).
b. Altitudes up to and including 2,438 m (8,000 feet). Rated load may be
reduced by 3.5 percent for each 305 m (1,000 feet) above 1,219 m (4,000 feet) (e.g.,
at 8,000 feet rated load may be reduced by 14 percent).
c. With 127 millimeters (mm) (5 inches) of rain per hour impinging on the set at
angles from the vertical up to 45 degrees.
d. With 355 British thermal units (BTUs) per square foot per hour of solar
radiation.
e. With sand and dust particle concentration of up to 1,400 milligrams per cubic
meter (mg/m³). Particle sizes shall range from less than 74 micrometers in diameter to
1,000 micrometers with the bulk of the particles ranging in size from 74 to 350
micrometers.
f. With a steady windspeed of 22 meters per second (m/s) (73 feet per second
[ft/s]) and gusts up to 29 m/s (95 ft/s) at a height of 3 m (10 feet) above ground level.
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g. With accumulations of ice glaze, freezing rain and hoarfrost of up to 13 mm
(0.5 inch) and up to a specific gravity of 0.9.
h. In a salt fog or sea spray environment.
3.9.2 Storage. The set without packaging shall not be damaged (see 6.4.3.1) by
exposure to:
a. Storage at -51 to 71 °C (-60 to 160 °F).
b. Salt fog environment.
c. All possible relative humidities.
3.9 Environmental requirements.
3.9.1 Starting and operating. The set shall start and operate under each and any
combination of the following operating conditions:
a. All possible relative humidities, with ambient temperatures ranging from -32 to
49 °C (-25 to 120 °F) at sea level; and from -32 to 35 °C at 1,219 m (-25 to 95 °F at
4,000 feet). The high temperature requirement remains at 35 °C (95 °F) at altitudes
above 1,219 m (4,000 feet).
b. Altitudes up to and including 2,438 m (8,000 feet). Rated load may be
reduced by 3.5 percent for each 305 m (1,000 feet) above 1,219 m (4,000 feet) (e.g.,
at 8,000 feet rated load may be reduced by 14 percent).
c. With 127 millimeters (mm) (5 inches) of rain per hour impinging on the set at
angles from the vertical up to 45 degrees.
d. With 355 British thermal units (BTUs) per square foot per hour of solar
radiation.
e. With sand and dust particle concentration of up to 1,400 milligrams per cubic
meter (mg/m³). Particle sizes shall range from less than 74 micrometers in diameter to
1,000 micrometers with the bulk of the particles ranging in size from 74 to 350
micrometers.
f. With a steady windspeed of 22 meters per second (m/s) (73 feet per second
[ft/s]) and gusts up to 29 m/s (95 ft/s) at a height of 3 m (10 feet) above ground level.
MIL-DTL-53133C
15
g. With accumulations of ice glaze, freezing rain and hoarfrost of up to 13 mm
(0.5 inch) and up to a specific gravity of 0.9.
h. In a salt fog or sea spray environment.
3.9.2 Storage. The set without packaging shall not be damaged (see 6.4.3.1) by
exposure to:
a. Storage at -51 to 71 °C (-60 to 160 °F).
b. Salt fog environment.
c. All possible relative humidities.