Figure 13. Tachometer Errors Such As: tacho out of bounds, tacho too high, tacho too low or tacho failure

Figure 12. UTD Tracking Errors Such As: track sensor fault, blades apparently moving at wrong speed, blade chords different or track FIFO overrun

Table 1. Error Reported on CADU Error Screen

TM-1-6625-724-13P Aviation Vibration Analyzer Manual
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TM 1-6625-724-13&P 0025 00 0025 00-13 Figure 13. Tachometer Errors Such As: tacho out of bounds, tacho too high, tacho too low or tacho failure IS THE ERROR WITH A MAGNETIC OR OPTICAL TACHOMETER SENSOR? MAGNETIC SENSOR OPTICAL SENSOR WHEN THE COLLECTIVE IS FULL UP, IS THERE SLACK IN THE CABLE? IS THE GAP BETWEEN THE STRIKER PLATE AND THE SENSOR BETWEEN .03 AND .06? REINSTALL IS THERE FERROUS MATERIAL CORRUPTING THE SENSOR (EG. INCORRECT ATTACHMENT SCREWS ON SWASHPLATE)? CLEAN OR REINSTALL REPLACE SENSOR OPERATIONAL? DAU INTERNAL ERROR. RETURN TO TMDE FOR REPAIR WITH POWER APPLIED TO THE DAU AND THE SENSOR POINTED AT REFLECTIVE TAPE, DOES THE RED LIGHT ON THE BACK OF THE SENSOR LIGHT UP? IS GAIN SET TO MAXIMUM? ARE YOU USING NEW REFLECTIVE TAPE? INSTALL NEW TAPE SET TO MAXIMUM REPLACE SENSOR IS THE REFLECTIVE TAPE INSTALLED ON THE BLADE SO THE SENSOR CAN SEE IT? IS SENSOR ON THE CORRECT CHANNEL? CONNECT TO PROPER CHANNEL REINSTALL YES NO YES NO YES NO YES NO YES NO YES NO YES NO YES NO REINSTALL YES NO OPERATIONAL? YES NO DAU INTERNAL ERROR. RETURN TO TMDE FOR REPAIR

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