TM 55-1520-240-T16-4.2 HEADS UP DISPLAY SYSTEM VISUAL CHECK (Continued)TASK RESULT1.Check Converter Control Unit (1).If any switch, indicator, or control panel (1) is damaged, replaceitem as required.2.Check HUD control switch (2) on pilot'sIf either switch (2) is damaged, replace(3) and copilot's (4) thruster grip.HUD Control Switch.3.Check HUD SYS circuit breakerIf either circuit breaker (5 or 6) is damaged,(5) and HUD REF circuit breaker (6)replace circuit breaker.on copilot's circuit breaker panel (7).4.Check Air Data Transducer (8).If transducer (8) is loose or damaged, tighten or replace it asrequired. If connector to transducer is loose or damaged,tighten or replace as required. If wiring to connector isdamaged, repair or replace it as required.5.Check Signal Data Converter (9).If converter (9) is damaged or any LED on the converter isdefective, replace it. If converter is loose, tighten it. If anyconnector to converter is loose or damaged, tighten or replace itas required. If wiring to a connector is damaged, repair orreplace it as required.6.Check Inclinometer (10).If Inclinometer (10) is loose or damaged, tighten or replace it asrequired. If connector to Inclinometer is loose or damaged,tighten or replace it as required. If wiring to the connector isdamaged, repair or replace it as required.7.Check pilot's or copilot's Display Unit'sIf either Optical Unit (11) or Power Supply(if available) Optical Unit (11) and PowerCalibration Unit (12) is damaged, replace theSupply Calibration Unit (12).Display Unit. If the cable between the units is damaged, repairor replace it as required.FOLLOW-ON MAINTENANCE:If the Converter Control Unit (1), Air Data Transducer (8), Signal Data Converter (9), Inclinometer (10), or a Display Unit (11) andPower Supply Calibration Unit (12) is replaced, an operational check (16-4.3) must be performed.END OF TASKChange 18 16-149
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