MIL-V-62475(AT)
3.5.25.l Winterization equipment. The FISTV vehicle shall make provisions for installation of an engine coolant and battery heater kit. This kit shall enable the vehicle to start after a cold soak period of not less than eight hours nor more than 12 hours at -65°F (-54°C) (see 4.6.4.24.1).
3.5.25.2 Emergency power. A back-up emergency power provision shall be available which allows the equipment and vehicle batteries to be connected in parallel. This shall enable starting the engine and operating the hydraulic pump with insufficiently charged vehicle batteries and allow use of the electrical and electronic equipment from vehicle batteries when equipment batteries are insufficiently charged. The emergency power shall be controlled by the master switch unit at the drivers station (see 4.6.4.24.2).
3.5.25.3 Lights. The lights, as specified on applicable drawings, shall operate throughout all vehicle operating conditions (see 4.6.4.24.3).
3.5.25.4 Slip ring. The FISTV vehicle slip ring shall provide uninterrupted continuity of communications, power and signal circuits throughout continuous bi-directional rotation of
360 degrees. The operation of the slip ring shall not introduce noise or static into the communications system, which would impair intercommunication intelligibility (see 4.6.4.24.4).
3.5.26 Communications. The communications station shall make provisions for installation of one AN/VRC-46 radio set, three AN/GRC-160 radio sets, one AN/PSG-2A or AN/PSG-5
DMD, one COMSEC/TSEC KY-57 device, one Position Location Reporting System (PLRS) and
one intercommunication distribution unit. Each of the four crew operating stations shall be provided with an intercommunication control unit. The communication system shall provide intelligible conversation during 360 degrees azimuth rotation of the turret and during the cycling of the hydraulic pump (see 4.6.4.25).
3.5.26.l Intercommunication set. The intercommunication distribution and control units shall permit each of the four operating stations: driver, targeting station, observation and communications, to selectively monitor the intercommunication system and any combination of the four radio receivers while selectively transmitting on any of the four radio transmitters as well as the intercommunications system. The intercommunication control unit for the communication station (commander) shall be connected so that by means of a switch on the
intercom distribution unit it may be the only such station with voice transmission via the selected radio. This switch shall allow for commander and crew (CDR + CREW), commander only
(CDR ONLY), or LISTEN ONLY modes of operation. It shall be possible to transmit simultaneously on all four radios when they are assigned to different frequencies. The noise
level of the targeting station intercom shall not unreasonably degrade communications. Each crew station shall have volume control that adjusts audio level (see 4.6.4.25).
3.5.27 Hydraulic system.
3.5.27.1 Hydraulic fluid leakage. Leakage at the hydraulic lines, connections and reservoirs shall not exceed a droplets condition as defined in 6.4.1 (see 4.6.4.26.1).
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