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|  MIL-M-48640 (AR)
3.9.5 Humidity. The MBD shall operate as specified herein at
up to 100 percent relative humidity (see 4.7.9.7).
3.9.6 Dust. The MBD shall operate as specified herein after
exposure to moving dust for not less than 12 hours at velocities up
to 1750 feet per minute (see 4.7.9.8).
3.9.7 Solt fog. The MBD shall operate as specified herein
after exposure to a 5 percent sodium chloride atomized spray for not
less than 48 hours (see 4.7.9.9).
3.10
Workmanship.
3.19.1 Optical inspection. The MBD shall be viewed with the
unaided eye from the objective end against a background of
approximately 300 foot candles. There shall be no cracks, chips, or
band separation. When a focused target is viewed through the
eyepiece end, there shall be no scratches, chips, dirt, or coating
deterioration which would be a distraction to the observer.
3.10.2 Mechanical inspection. The mechanical parts of the unit
shall be inspected for broken parts, completeness, workmanship and
functionability. The locating block shall be checked for freedom
and smoothness of operation. Paint chips or nicks which do not
affect the function of the instrument shall be touched up. All
burrs and excess material shall be-removed. from castings and
forgings. All surfaces, including threads, shall be free from burrs
and sharp edges.
4. QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for inspection. Unless otherwise specified
in the contract or purchase order, the contractor is responsible for
the performance of all inspection requirements as specified herein.
Except as otherwise specified in the contract or purchase order, the
contractor may use his own or any other facilities suitable for the
performance of the inspection requirements specified herein, unless
disapproved by the Government. The Government reserves the right to
perform any of the inspections set forth in the specification where
such inspections are deemed necessary to assure supplies and services
conform to prescribed requirements.
4.1.1 General provisions. The component and subassembly
inspection requirements of MIL-F-13926 form a part of the quality
assurance provisions of this specification. Definitions of
inspection terms shall be as listed in MIL-STD-109.
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