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Page Title:
Environmental service conditions |
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|  MIL-A-48449A(AR)
3.8
Environmental
service
conditions.
3.8.1 Storage temperature.
The alignment device shall be
capable of withstanding temperature stabilization at +160F
(71C) and -50F (-46C) for a period of 4 hours at each
Subsequent to return to standard ambient
temperature
extreme.
temperature, the alignment device shall not have been damaged or
adversely affected and shall meet the requirements of 3.9 (see
4.6.2).
Operating temperature.
3.8.2
Unless otherwise specified,
the alignment device shall meet the requirements of 3.9.6.2 while
thermally stabilized at temperatures of +150F (66C) and
-40F (-40C).
Subsequent to return to room temperature,
the alignment device shall not have been damaged or adversely
affected and shall meet the requirements of 3.9 (see 4.6.3).
The alignment device in its Carrying Case (or
3.8.3 Shock.
a simulated case) shall withstand a total of 18 shock impulses,
Each shock
3 in each direction of 3 mutually perpendicular axis.
impulse shall be a half-sine wave with a time duration of 11 + 1
milliseconds.
The peak amplitude of each shock impulse shallbe
Subsequent to shock, the alignment device shall not have
75g's.
been damaged or adversely affected and shall meet the require-
ments of 3.8.5 and 3.9 (see 4.6.4).
3.8.4
Vibration.
The alignment device in its Carrying
3.8.4.1 Vibration "A".
Case (or a simulated case) shall withstand vibration for 15
minutes each in 3 mutually perpendicular directions.
Vibrations
in each direction shall be at frequencies varied logarithmically
The double amplitude of applied vibrations
from 5 to 500 Hz.
shall be .036 inches at lower frequencies and shall be maintained
at, but not exceed, a 5g level at higher frequencies.
Subsequent
to vibration, the alignment device shall not have been damaged or
adversely affected and shall meet the requirements of 3.8.5 and
3.9 (see 4.6.5.1).
With the alignment device held by
3.8.4.2 Vibration "B".
the upright tube in a horizontal position, the alignment device
shall-be-vibrated in a vertical plane at a constant frequency of
thirty Hz with an amplitude of 1/16 inch (1/8 inch total
excursion) for a period of five minutes plus or minus 15 seconds.
Subsequent to vibration, the Alignment Device shall not have been
damaged or adversely affected and shall meet the requirements of
3.8.5 and 3.9 (see 4.6.5.2).
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