TM 9-2350-267-10CREW AUTOMATIC FIRE EXTINGUISHING SYSTEM (AFES)COMPONENTS - ContinuedCAUTIONDo not use high pressure washing on AFEScomponents.OPTICAL FIRE SENSING ASSEMBLY (OFSA)OFSA is four sensor units located in the crew compartment, each using three infrared(IR) wavebands designed to detect hydrocarbon fuel fires.OFSA does not detect sunlight, electrical discharges, lamps, or flashes, fragmenta-tion, or radiation from warheads or other battlefield activity.OFSA units are housed in individual shock resistant aluminum casings mounted onbrackets.OFSA units have BITE, which internally tests each unit for normal operation. Bite indi-cates a fault in the OFSA by lighting a LED on the T/A panel.The four OFSA units provide complete coverage of the crew compartment.4-14
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