TM 55-1680-351-10
Section II. OPERATION UNDER USUAL
CONDITIONS
31.
Preflight Procedures
Perform the following steps prior to use for each Radio Set AN/PRC-90.
WARNING
Leave the function switch in the OFF. position.
Refer to paragraph (1) Unauthorized personnel
shall not perform maintenance on the AN/PRC-
90.
a. Unscrew battery cap and remove battery, if installed. Check date of
manufacture stamped on battery. Battery BA-1568/U has a maximum
shelf life of 3 years in temperate climates and a ma/hr rating of 1,000
(approximately 14 hours of operation maximum in beacon mode). Discard
batteries more than 3 years old. Check for evidence of battery leak- age or
corrosion and condition of copper spring contacts. Install a good battery, if
required, and screw battery cap on fingertight.
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