0006 00TM 1-6625-724-13&P0006 00-4the system. A green power indicator lamp will illuminate when external power is applied to the DAU andthe DAU power switch is in the ON position. The green light is not an indication of correct connections,only that the switch is on and power is applied. The green light will also light if connected backwards.2.InstallingUniversalTrackingDeviceWARNINGInstallation of the UTD assembly on the nose mount(tracker mount) will cause the wirestrike protectionsystem to be ineffective. All flights with the UTDinstalled are limited to areas where wire strikes arenot likely.The installation of the UTD is critical to its proper operation and correct measurement. Figure 2 providesa diagram of the required aircraft mounting. The exact mounting position of the UTD and the installationangle are determined by the aircraft setup file, and the aircraft specific UTD bracket. To mount the UTDto the aircraft under test, attach the UTD bracket to the airframe at the required position. After the bracketis secured, attach the UTD to the bracket. There is a critical consideration to observe during installationfor accurate measurements, the arrow on the body of the UTD must point in the direction of bladerotation.NOTEThe UTD lens should be cleaned periodically with opticaltissue or soft cloth for optimum performance.3. Installing Magnetic RPM SensorCAUTIONThe Magnetic RPM Sensor must be installed in theprescribed position or an incorrect blade may beused as the reference blade. Blade color-codingmust be determined if correct prior to starting workon rotor.The position and gap of the Magnetic RPM Sensor is critical to the operation of the AVA. The MagneticRPM Sensor must be installed in the position prescribed by the appropriate aircraft work package oradjustments will be recommended for the wrong blade.(a) Mount the Magnetic RPM Sensor from below the bracket with a jam nut on either side.(b) Adjust the Magnetic RPM Sensor for a gap specified in the specific work package. Tighten jam nuts.(c) Rotate the main rotor by hand and align the interrupter and the Magnetic RPM sensor. Check theclearance at the Magnetic RPM Sensor. Some aircraft will have a single interrupter at one positionon the swashplate and other aircraft will have one double interrupter and a single interrupter for eachother blade position. The aircraft setup file will prescribe either a single or double bladed interrupter.It is important to use the correct type of interrupter consistent with the aircraft setup file or tachometerfrequency errors will occur. Consult the appropriate aircraft work package.CAUTIONAlways install lockwire after tightening the jam nut.A loose jam nut could cause aircraft damage.(d) Install lockwire on jam nuts.
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