Chapter 5 – General Operation
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2. Install the Velocimeter as the user normally would for the
subject aircraft.
3. Press TRACK & BALANCE from the Main Menu screen to
acquire a balance reading.
4. Operate the aircraft in the appropriate balance regime and
select the channels for the tail rotor. The Vibrex unit
automatically begins to acquire readings.
5. Store the readings by annotating them as they are acquired.
Up to 50 balance readings (total) can be stored, after which
the first readings are overwritten.
6. To use paper polar graphs to finish balancing the subject tail
rotor, plot the points given by the Vibrex unit’s screen
displays, as explained in the following sections:
Section 5.5.4.1 “Clockwise Rotors”
Section 5.5.4.2 “Counter-Clockwise Rotors”
5.5.4.1
Clockwise Rotors
Finish balancing clockwise-turning rotors, as follows:
1. Obtain a reading from the Vibrex unit’s screen displays.
2. Obtain the correct paper polar chart for use with the subject
tail rotor. The user may use a manufacturer’s chart from the
maintenance manual or one supplied from Honeywell.
3. Using the red (clockwise) side of the Rotor Protractor, align
the photocell on the protractor with the azimuth of the
photocell on the helicopter.
4. Plot the balance point from the Vibrex unit onto the chart,
using the clock numbering on the Rotor Protractor aligned,
as in step 1 on the chart. For an explanation of how to use
the Rotor Protractor, see Section 5.5.3 “Using the Rotor
Protractor”.
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