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|  MILT-48558B(AR)
.25 mil in azimuth and elevation due to subjecting
the
telescope
to Vibration "A", Vibration "B", or Shock.
3.7.6
Radiological
requirement.
3.7.6.1 Radiological
contamination. Any part of Tritium
shall not be present on the external surfaces of the Elbow
Telescope in excess of 1000 dpm/100 sq. cm. subsequent to exposure
of requirements 3.7.1 through 3.7.4.2 as required by para 4.3.2
Final acceptance inspection provisions or para 4.4 Special
sampling provisions, as applicable.
3.7.7 Reliabiltiy. The Telescope shall
be
subjected
to
reliability assurance tests as follows:
a. The Elbow Telescope shall meet the requirements of
storage and operating temperatures of paragraphs 3.7.1 and
3.7.2.
b. The telescope shall be shocked
and
conform
to
the
requirements of paragraph 3.7.3.
c. The telescope shall withstand the Vibration
"A"
requirements as noted in paragraph 3.7.4.
3.8
Sealing
and
purging.
3.8.1 Sealing. The telescope shall show no evidence of
leakage when subjected to an internal pressure of 5.0 + 0.1 pound
per square inch gage (psig) for a minimum of one hour. The
diopter scale must not be moved from its initial position during
this test.
3.8.2 P u r g i n g . The interior of the telescope shall be
purged with dry nitrogen supplied at a pressure of 6 1/4 psi
until the dew point of the emergent gas is no higher than -25F.
Purging apparatus shall be removed when relief valve is reseated
and maintains pressure of 3 + 0.10 PSIG.
3.9 Cleanliness.
3.9.1 The Telescope shall
meet
the
cleanliness
requirement
of
specification MIL-0-13830.
3.9.2 D i r t . This requirement shall be met with the
observations for dirt and foreign particles (classed as dirt) made
through the eye end of the telescope. The maximum size of any
particle appearing on the reticle surface shall not exceed the
width of the reticle line. There shall be no more than three
particles within the central 50 mil diameter field of view. There
shall be no more than three particles outside the central 50 mil
5
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