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Page Title:
Effects of vibration and shock. |
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|  MIL-A-48449A(AR)
This requirement
3.8.5 Effects of vibration and shock.
shall be met with conditions of 3.6 reestablished.
The line of
sight established prior to vibration or shock shall not deviate
more than .1 mil in azimuth due to subjecting the Alignment
Device to Vibration "A" , Vibration "B", or Shock (see 4.6.6).
3.9
Performance.
3.9.1
Sealing.
The interior of the alignment device shall
be capable of maintaining 10 pounds per square inch gage (psig)
for a period of 2 hours + 10 minutes at a temperature of 750 +
15F.
At the end of the 2 hour period, the leakage shall not
have exceeded 0.2 psig.
The pressure within the alignment
device shall then be returned to 1 to 2 pounds per square inch
The interior
gage (psig) and the optical cavity sealed.
atmosphere of the optical cavity of the accepted alignment
device assembly shall be nitrogen in accordance with 3.9.2 (see
4.6.7).
The interior of the alignment device shall
3.9.2
Purging.
be flushed with dry nitrogen until the gaseous mixture bled
from the alignment device has a dew point of at least as low as
-25F (see 4.6.8).
3.9.3
Cleanliness.
This requirement shall be met with the
3.9.3.1 Dirt.
observations for dirt and foreign particles (classed as dirt)
made through the objective end of the alignment device.
The
maximum dimension of any particle appearing on the reticle
There
surface shall not exceed the width of the reticle line.
shall be not more than three particles visible on the reticle.
There shall be no dirt in the optical system which shall
interfere with observation or adversely affect image quality.
particles smaller than 1/4 reticle line width shall be ignored
regardless of distribution (see 4.6.9).
3.9.3.2
Defects.
There shall be no evidence of moisture,
condensates, fractures, and adhesive separations
finger
prints,
Internal inspection shall be made by
on any glass component.
viewing through the objective end of the alignment device (see
4.6.9).
3.9.4
Accuracy.
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