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MIL-T-48558B(AR)
4.8.9  Image  tilt.  Test  may  be  performed  with  the  telescope
positioned  as  outlined  in  4.8.2.  The  test  is  performed  by
sighting  through  a  pre-plumbed  auxiliary  telescope  5549108  and
observe  parallelism  between  the  center  horizontal  reticle  line  of
the  target  reticle  and  the  horizontal  reticle  line  of  the
auxiliary  telescope.  Both  horizontal  lines  must  be  parallel  and
shall not exceed the limits of the angular lines of the target
reticle  to  assure  compliance  with  3.10.5.
4.8.10  Operability.  The  operability  and  torque  of  the
telescope's  diopter  adjustment,  latch,  attachment,  and  release
torque  shall  be  tested  by  use  of  a  torque  wrench  and  appropriate
adapters  at  the  temperatures  specified  for  compliance  with  3.12.1,
3.12.2,  3.12.3,  and  3.12.2.1.
4.8.11  Illumination.  The  reticle  illumination  test  shall  be
performed under simulated conditions specified in 3.13.1. Place
Place
the  instrument  in  a  dark  room  having  a  controlled  light  source.
The  observer  and  instrument  must  be  dark  adapted.  Prior  to
performing  the  test,  place  a  white,  matted  surface  approximately  2
feet  from  the  telescope  window.  Perform  the  test  by  observing
reticle  pattern  and  determine  that  this  pattern  is  clearly
discernible  by  means  of  the  self-illuminating  source  in  the  dark
room.  Gradually  raise  the  level  of  illumination  to  where  the
pattern  becomes  indiscernible.  Place  a  fixed  stop  having  an
aperture  of  one-half  inch  over  the  objective  window  and  observe
that  the  reticle  pattern  is  again  clearly  discernible  by  means  of
the  self-illuminating  source.  Raise  the  ambient  level  of
illumination  to  10  foot  candle,  remove  the  fixed  stop  and  observe
the  reticle  pattern.
4.8.12  Radiological  contamination.  Contamination  test  shall
be  performed  by  wiping  the  telescope  with  filter  paper  moistened
in  distilled  water.  The  wiping  shall  be  performed  with  moderate
fomger  pressure.  The  damp  filter  paper  shall  be  placed  in  a
container with the proper portion of scintillation liquid. The
The
scintillating  system  used  to  measure  contamination  must  be
calibrated.  The  read  out  shall  be  within  10%  of  the  known
standard  value  when  counted  to  a  total  of  2000  disintegrations.
The  actual  test  for  determining  contamination  is  performed  by
placing  the  container  into  the  scintillation  system.  The  measured
contamination  shall  be  within  the  limits  specified  in  3.7.6.
4.8.13
Sealing
and
purging.
4.8.13.1  Sealing.  The  assembled  elbow  telescope  shall  be
capable  of  withstanding  an  internal  pressure  of  5  +  0.10  psig  for
a  period  of  1  hour  with  no  evidence  of  leakage.  Prior  to  the
start  of  the  test,  secure  the  poppet  valve  in  a  closed  position.
Then  pressurize  the  telescope  with  dry  nitrogen  as  specifies  in
paragraph  3.8.1.  Accuracy  of  the  test  equipment  used  for  this
15

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