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MIL-T-62255C(AT)
3.2.4.1 Climatic conditions. The vehicle shall be capable of operation in ambient
temperatures from +125F to -25F, as specified in categories 1 through 6 of Table I.
3.2.4.2 Climatic conditions, extreme. When specified (see 3.1.1.10), the vehicle shall be
capable of operation in ambient temperatures of -25F to -50F, as specified in Category 7 of
Table I.
3.2.4.3 Climatic conditions, storage and transit conditions. Vehicle shall be capable of
meeting the storage and transit conditions as specified in Categories 1 through 7 of Table I
without evidence or malfunction on any component of the vehicle.
TABLE I. SUMMARY OF TEMPERATURE, SOLAR RADIATION,
AND
RELATIVE HUMIDITY DIURANAL EXTREMES
OPERATIONAL CONDITIONS
STORAGE AND TRANSIT
CONDITIONS
INDUCED
AMBIENT
INDUCED AIR
SOLAR
CLIMATIC
AMBIENT AIR
RELATIVE
RELATIVE
TEMPERATURE
RADIATION-
TEMPERATURE-
HUMIDITY
HUMIDITY-
DEGREES F
BTU/FT2/HR
DEGREES F
CATEGORY
%
%
1
WET-WARM
Nearly
Negligible
95 to 100
Nearly
95 to 100
Constant
Constant
75
80
2
WET-HOT
70 to 95
0 to 360
74 to 100
90 to 160
10 to 85
3
HUMID-HOT
85 to 100
0 to 360
63 to 90
90 to 160
10 to 85
COASTAL
DESERT
4
HOT-DRY
90 to 125
0 to 360
5 to 20
90 to 160
2 to 50
5
INTER-
MEDIATE
HOT-DRY
70 to 110
0 to 360
20 to 85
70 to 145
5 to 50
6
INTER-
Tending
Tending
MEDIATE
-5 to -25
Negligible
Toward
-10 to -30
Toward
Saturation
Saturation
7
COLD
-25 to -50
Negligible
Tending
-35 to -50
Tending
Toward
Toward
Saturation
Saturation
12

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