TM 1-6625-724-13&P0074 000074 00-15Figure 8. Optical RPM Sensor Mounting BracketNOTEIt there is any tape remaining from previous balanceroutines, this must be completely removed to ensure aclear and accurate tachometer signal to the DAU.e. Place a single, 3-inch strip of reflective tape on the inside of one of the tail rotor blades at the approximatelocation as the beam of the optical interrupter, see figure 9. This becomes the target (TGT) blade.AccelerometerOptical TachometerSensor
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