TM 1-6625-724-13&P
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TASK 1 - TEST EQUIPMENT INSTALLATION/CHECKOUT
Figure 2. Typical AVA Test Setup Configuration
NOTE
If main and tail rotor track and balance are to be
accomplished, always perform task 5 Balance Tail Rotor
first.
PROCEDURE 1: EQUIPMENT INSTALLATION
a. Remove AVA blade tracking equipment from transport case. Check for possible damaged equipment and
frayed cables. Figure 2 is the typical AVA test setup configuration.
b. Install DAU in the canvas carrying case. Secure DAU in avionics compartment strapped on top of the
ASN-137 Doppler signal data converter using the canvas straps and rings, with connectors facing forward.
NOTE
It is recommended that the CPO cyclic be locked out
during rotor smoothing operations.
c. Connect the power cable (29104700) to the aircraft power receptacle located to the right side of the CPO's
cyclic and to the DAU receptacle marked 28 Vdc.
d. Place CADU in front cockpit area ensuring not to obstruct the pilot's flight controls. Connect CADU to DAU
cable (29325601) to CADU and to DAU receptacle marked CADU.
PROCEDURE 2: MAGNETIC RPM SENSOR INSTALLATION
a. Install magnetic RPM sensor (27288400) through underside of magnetic RPM sensor bracket. The magnetic
RPM sensor bracket is permanently installed on the swashplate assembly. Connect previously stowed
airframe-supplied magnetic tachometer interface cable to magnetic sensor, see figure 3.
b. Connect magnetic RPM sensor cable (27288400) to connector located to the right side of the CPO's cyclic and
to the DAU receptacle marked TACHO 1. As an alternative to using the airframe-supplied harness, you may
route the magnetic RPM sensor cable (27288400) externally to the RPM sensor and to TACHO1 on the DAU.
The preferred method is to use the airframe-supplied harness. If using the external method of connecting to
the RPM sensor, make sure to include enough slack in the cable to allow for swashplate movement during
flight.
