MIL-DTL-27188C
4.5.21 Lighting test. Lighting tests shall be conducted in accordance with MIL-L-27160,
sampling plan B, except the dielectric test shall not be conducted.
4.5.22 Reliability. Seven indicators shall be tested for reliability. Recording, data
handling, and reporting shall be performed for the government. Test plan I-D of MIL-HDBK-781
may be used for guidance.
4.5.22.1 Reliability test. Seven indicators shall be selected for reliability testing. The test
equipment and fixtures shall include provisions for vibration and temperature cycling at the periodic
intervals specified herein. During this test, input signals shall be applied to the indicator at a rate of
2 cycles minimum and 3 cycles maximum per minute from 0 percent to 85 percent of full scale and
return. The test shall begin when rated power is applied. After completion of 4 hours of operation
with rated power on, which shall include at least 480 cycles of operation, the power shall be turned
off and shall remain off for a period of 10 minutes. The indicator shall be vibrated at 2.2g ±
10 percent peak acceleration value at any non-resonant frequency between 20 cps and 60 cps
measured at the mounting points of the equipment. The duration of vibration shall be at least
10 minutes during each hour of equipment operating time. The temperature cycles shall be
conducted in the following sequence: 4 hours at -20 °C, 14 minutes for temperature change to
50 °C at a minimum rate of 5 °C per minute; 4 hours at 50 °C, 14 minutes for a temperature change
to -20 °C; and 4 hours at -20 °C. In case of malfunction, the malfunction shall be recorded and the
test interrupted while repairs are made. Upon completion of each 250 hours of cycling, the indicator
shall be checked for scale error. The scale error reading shall not exceed 150 percent of the room
temperature tolerance in table III. No recalibration shall be performed on the units during the test.
The test may be interrupted for weekend shutdown. The contractor shall prepare a written report for
the government of the test procedures, details of any malfunctions, and the corrective action.
MIL-HDBK-781 may be used for guidance.
4.5.22.1 Longevity. At the completion of the reliability test, testing of three of the indicators
shall be continued for a total of 3,000 hours each. The test time accumulated during the reliability
test shall be applied to this test.
4.6 Maintenance of qualification. At specified intervals determined by the qualifying
activity, the manufacturer must be able to demonstrate that the company still has the capabilities
and facilities necessary to produce the QPL items in accordance with this specification and the
provisions governing qualification specified in SD-6.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified
in the contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-
house contractor personnel, these personnel need to contact the responsible packaging activity to
ascertain packaging requirements. Packaging requirements are maintained by the inventory
control point's packaging activities within the military service or defense agency, or within the
military service's system command. Packaging data retrieval is available from the managing
military department's or defense agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
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