/+.&6.
15
4.3.4 Demagnetization. Each cartridge shall be moved past a pilot's standby compass type MS17983 in
an area free of local magnetic effects. The cartridge shall be passed six inches from the compass face in a
north to south horizontal position with the compass placed in an east to west heading. The entire
cartridge shall pass by the compass face. The compass and the cartridge shall be approximately the same
height from the floor. The test procedure shall be repeated for every 90 degree rotation of the cartridge
body. Each cartridge shall meet the requirements of 3.4.4.
FIGURE 1. Axis orientation for the vibration/shock test.
4.3.5 Vibration test. The cartridges shall be submitted to a series of vibration test profiles. The test
fixture shall be such that two cartridges shall be installed on three sides of the fixture at once. The
cartridges shall be vibrated along each of the three mutually perpendicular axis orientations as shown in
figure 1.
a. Non-gunfire vibration.
(1) Resonance: The cartridges shall not be subjected to a resonance search or dwell during the non-
gunfire vibration due to the physical characteristics; small size and weight and the method of testing the
cartridge, which is inside the vibration (cube) test fixture.
(2) Sinusoidal cycling (5 Hz to 2,000 Hz): The six cartridges shall be subjected to the sinusoidal
vibration cycling at 70EF for 1 hour with the frequency varying logrithmically from 5 Hz to 2,000 Hz and
back to 5 Hz in approximately 20 minutes. The test level is shown in figure 2.
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