MIL-DTL-48558C
target reticle. The intersecting point must be within the limit specified in 3.4.1. Observe
the telescope reticle orientation to the target prior to vibration testing.
4.5.1 Storage temperature. With a fresh battery installed and the telescope purged
per 3.8, the telescope shall be placed in the test chamber and the temperature of the
chamber reduced gradually to -60 ± 5°F and shall remain at this temperature for a
minimum of 4 hours. At the completion of this 4 hour period, the temperature shall then be
gradually raised to +160 ± 5 °F and the elbow telescope shall remain at this temperature for
a minimum of 4 hours. At the completion of this 4 hour period the temperature of the test
chamber shall be gradually reduced to room ambient temperature (+60°F to +90°F) at
which time the telescope shall be removed from the test chamber. The elbow telescope
shall then meet the requirements listed in 3.5.1. As an option, the telescope may be
removed from the environmental chamber and be inspected at the high and/or low
temperature to observe the elbow telescope s condition if a failure is suspected. (See 6.7)
4.5.2 Operating temperature. With a fresh battery installed and the telescope
purged per 3.8, the telescope shall be placed in the environmental chamber and the
temperature of the chamber reduced gradually to -50 ± 5°F. The telescope shall remain at
this temperature for a minimum of 4 hours. At the completion of this 4 hour period, and
while at -50 ± 5°F, the elbow telescope shall meet requirements listed in 3.5.2. Upon
completion of this portion of the test, the telescope shall then be placed back in the
environmental chamber and the temperature shall be raised gradually to +145 ± 5°F. The
telescope shall remain at this temperature for a minimum of 4 hours. At the completion of
this 4 hour period, and while at +145 ± 5°F the elbow telescope shall again meet
requirements listed in 3.5.2. Upon completion of this test, the elbow telescope shall be
returned to the environmental chamber and the temperature shall be gradually reduced to
room ambient temperature (+60°F to +90°F) at which time the elbow telescope shall be
removed from the test chamber and shall again meet requirements listed in 3.5.2. (See 6.7)
4.5.3 Shock. The telescope shall be positioned on adapter 10549199 or functional
equivalent and secured to the shock test equipment. The telescope shall then be subjected
to a shock test in accordance with 3.5.3. Upon completion of the shock test, the telescope
shall meet the requirements listed in 3.5.3.
4.5.4 Vibration "A". The telescope shall be positioned on adapter 10549199 or
functional equivalent and secured to the vibration test equipment. The telescope shall then
be subjected to a vibration test in accordance with 3.5.4. Upon completion of the vibration
test, the telescope shall meet the requirements listed in 3.5.4.
4.5.5 Vibration "B". The telescope shall be positioned on adapter 10549199 or
functional equivalent and secured to the vibration test equipment. The telescope shall then
be subjected to a vibration test in accordance with 3.5.5. Upon completion of the vibration
test, the telescope shall meet the requirements listed in 3.5.5.
4.6 Collimation change, post shock and vibration. After any required shock and
vibration testing, and with the orientation of 4.4 re-established, observe and record the
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