A.

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MIL-DTL-83361B

4.5.7 Sealing. The indicator case shall be tested for leaks by means of a mass-

spectrometer-type helium leak detector. The detected leakage rate shall not exceed 0.1 micron

cubic foot per hour at a pressure differential of 1 atmosphere.

4.5.8 Lighting. The indicator shall be subjected to the sampling plan A tests of MIL-L-27160.

4.5.9 Vibration. Prior to conducting this test, the test indicator shall be operated under

standard ambient conditions and a record shall be made of all data necessary to determine

compliance with the requirements of 4.5.5. The entire test shall be conducted at ambient

temperature with the indicator properly connected and with power applied. The lighting circuit

shall be energized with 4.5 V + 0.5 V, -0.0 V AC. The three mutually perpendicular axes of

applied vibration and the location where the acceleration and excursion(s) shall be monitored are

shown in figure 4. Duration of the various portions of this test shall be as specified in table IV.

No more than four resonances shall be tested in each axis.

VERT

0.180+0.004

LAT

-0.001

2.43 � 0.010

1.203 � 0.003

1.953+0.000

0.015

INPUT MONITORING

-1

LOCATION

TEST FIXTURE

CLAMP NASM28042

OR EQUIV

LONGITUDINAL

FIGURE 4. Installation for vibration test.