User's Manual

MIL-PRF-46374G
14
production watches until evidence has been provided by the contractor that corrective action has
been taken to eliminate the deficiencies.
4.6.5 Design. The watch shall be visually examined for conformance to 3.4.
4.6.5.1 Design approval. Manufacturing data on movement and case design shall be forwarded
to the government activity identified in 6.3 (see 3.4.1).
4.6.5.2 Mechanical power. Movement identity, design and construction (stem mount and stem
set) shall be determined prior to qualification testing for compliance with 3.4.2.1.1. With the
watch fully wound, it shall be examined for continuous running, without rewinding, for the
minimum time specified in 3.4.2.1.1.
4.6.5.3 Jewel bearings. One percent of the watches under contract, but not less than three
watches, shall be examined to ensure the watches contain the appropriate number of jewels placed
at the most critical friction points, and are in compliance with 3.4.2.1.2.
4.6.5.4 Electrical power. Movement identity, design, construction, availability and marking of
the power cell shall be determined prior to qualification testing for compliance with 3.4.2.2. The
watch shall be tested to ensure that the current drain allows an operating life as specified in
3.4.2.2. The watch shall be measured with a current meter to determine the timekeeping current
drain. To allow sufficient latitude in available power, the capacity of the power cell as measured
in milliampere-hours (ma hours) shall be derated by 20 percent to obtain the net power capacity of
the power cell. The comparison of power drain from the watch to the power capacity of the
derated power cell shall be made to ensure that a minimum life of 30 months can be obtained from
the power cell. The internal contacts for the cell shall be inspected for conformance with 3.4.2.2.
4.6.5.5 Hand adjustment. A standard type pull gauge with appropriate adapter shall be used to
apply the pull specified in 3.4.3. The crown shall not be damaged or separated from the
movement when the pull is applied.
4.6.5.5.1 Hand setting. To ensure compliance with the hour and minute “hand” setting of
3.4.3.1, six settings shall be made in 2-hour increments.
4.6.5.5.2 Second hand stop mechanism. To ensure compliance with the second hand stop
mechanism of 3.4.3.2, the second hand setting mechanism shall be activated for at least five
different settings, to ensure that a precise stop and start action can be obtained without adverse
effect on the hands or movement.
4.6.5.6 Elapsed time ring, type III. The elapsed time ring shall be examined for conformance to
3.4.4. The elapsed time ring shall move only when subjected to a torque applied clockwise and
counterclockwise of 180 ± 40.0 mNm (26 ± 6 inch-ounces). With the index at the 3 o’clock
position of the dial, a force of 44.5 ± 2 N (10 ± 1/2 pounds) shall be applied to the lower side of
the elapsed time ring without the ring being damaged or separated from the case.