MIL-DTL-83361B
4.5.20 Salt fog. The indicator shall be subjected to a salt fog test in accordance with
MIL-STD-810, Method 509, "Salt Fog", except the exposure shall be for a continuous 48-hour
period. There shall be no evidence of external corrosion or deterioration that might affect
subsequent operation. The scale errors after this test shall not exceed the tolerances specified for
room temperature scale error.
4.5.21 Unit torque gradient. The indicator shall be connected to the master transmitter
synchro and the master transmitter locked in the electrical zero position. The synchro rotors shall
then be energized with rated voltage and frequency ± 1 percent. Weights shall be applied to a
torque pulley that is positioned on the rotor shaft to rotate the shaft in a counter-clockwise
direction through an angle of 5 degrees of arc. The torque tending to return the shaft to its original
position shall be computed and shall be no less than 2,000 mg-mm per degree of displacement.
4.5.22 Lighting tests. Lighting tests shall be conducted in accordance with the sampling
plan B tests of MIL-L-27160, except the dielectric test shall not be conducted.
4.5.23 Reliability (life). Each section of the dual indicator shall be subjected to a
reliability (life) test conducted in 1-hour cycles for a total of 2,000 hours. At the beginning of each
cycle, the indicator shall be energized and the pointers rotated to approximately full scale and shall
remain energized in this position. After 57 minutes of each cycle, the pointers shall be rotated to
the zero position and the indicator shall be de-energized. During these periods, the lighting shall
be cycled as specified in the "Life" paragraph of MIL-L-27160. At the conclusion of this test, the
indicator shall pass the test specified in 4.5.5. The total unit operating hours shall be divided by
the total number of random failures which shall demonstrate an MTBF of 2,000 hours. A random
failure is any failure of the indicator to function within the performance limits of this specification
due to factors other than the following:
a. Exceeding the specified scheduled overhaul or replacement interval.
b. Improper maintenance.
c. Improper use.
For purposes of the MTBF computation, failures due to wearout prior to expiration of the
scheduled replacement or overhaul interval shall be counted as random failures.
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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