3.6.1 Screening procedures.
188.8.131.52 Temperature Cycling. The power supply assembly shall
be exposed to 3 temperature cycles between -60 degrees F and +160
degrees F with a minimum change rate of 5.5 degrees F per minute and
a minimum dwell time of 60 minutes at each extreme in the cycle.
The first cycle shall start at standard ambient conditions and the
first extreme shall be +160 degrees F. It shall take 3.33 hours to
complete 1 cycle, 10 hours total. If the minimum change rate is
exceeded, the dwell times shall be equally increased accordingly.
184.108.40.206 Vibration. The power supply assembly shall be exposed
to vibrations using the same conditions as 3.3.1 except that the
cycling time shall be reduced to 20 minutes per axis.
3.6.2 Failures after a screening procedure. Each failure shall
be recorded, categorized, and corrected as follows:
220.127.116.11 Workmanship failures.
Workmanship failures shall be
corrected without repeating the screening procedure that caused the
18.104.22.168 Power module failures. Power module failures shall be
corrected by replacing the failed module with a new module that has
been screened up to the procedure at which the failure occurred.
The screening procedure that caused the module failure shall then be
repeated on the power supply assembly.
3.7 First article. When specified in the contract or purchase
order, a sample shall be subjected to first article inspection in
accordance with the technical provisions herein (see 4.3).
3.8 Soldering. All soldering shall be in accordance with the
general requirements of MIL-STD-2000 in addition to detail
requirement (tasks)A, C and D of paragraph 1.2 of MIL-STD-2000.
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 (examinations and
tests) 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 this specification where such inspections are deemed
necessary to ensure supplies and services conform to prescribed