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TM 1-6625-724-13&P
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TASK 5 - BALANCE TAIL ROTOR
PROCEDURE 1: EQUIPMENT INSTALLATION
a. Remove AVA blade tracking equipment from transport case. Check for possible damaged equipment and
frayed cables. Figure 1 is the typical AVA test setup configuration.
b. Install DAU in the canvas carrying case.
c. Place DAU in the back seat with the connectors facing up and secure DAU using lap and shoulder belts and
canvas straps and D-rings.
d. Connect the UH-1 DC power adapter cable (29312800), figure 2, to the heater blanket receptacle and to the
10-ft power cable (29104700).
e. Connect power cable to the DAU receptacle marked 28 Vdc.
f. Connect CADU to DAU cable (29325601) to CADU and to DAU receptacle marked CADU.
PROCEDURE 2: ACCELEROMETER INSTALLATION
a. Mount accelerometer mounting bracket (29313000) on the 4 o'clock stud of the 90-degree tail rotor gearbox.
b. Install accelerometer (28110900) on accelerometer mounting bracket with the connector outboard and radial to
the 90-degree gearbox input drive shaft.
c. Connect accelerometer cable (29105600) to accelerometer.
CAUTION
Keep accelerometer cable snug around tail boom,
but do not pull cable tight enough to cause stress to
the accelerometer connector.
d. Wrap cable forward around tail boom and pass into cockpit. Connect accelerometer cable to the DAU
receptacle marked ACC4.
PROCEDURE 3: OPTICAL RPM SENSOR INSTALLATION
a. Remove the two center screws from the FM antenna faring just aft of the tail rotor gearbox.
b. Mount optical RPM sensor mounting bracket (29198700) at the base of the FM antenna-fairing base using the
two center screws, see figure 8.
c. Mount optical RPM sensor (29314700) to the bracket, facing the tail rotor.
CAUTION
Keep the optical RPM sensor cable snug around the
tail boom but do not pull cable tight enough to cause
stress to the optical sensor.
d. Route the optical RPM sensor cable the same as the accelerometer cable and connect it to the DAU receptacle
marked TACHO 2.
