Gen II
User Manual
4-22 – Propeller Balance
Chapter 4
Revision 2.2, Apr 2020
Rotate the propeller to visually align the Phototach with a point on the backside of the
target blade where you intend to place the reflective tape. Clean this area thoroughly to
ensure adhesion of the tape.
Cut a strip of reflective tape (3M Tape, Model 7610 is recommended) approximately 1.5
to 2 inches long. With the tape backing still in place, hold the tape in position on the
propeller blade and move the propeller blade back and forth in front of the Phototach
beam.
NOTE
To ensure quality reflective action back to the Phototach, use 3M 7610
reflective tape. Use of other reflective tape or devices may result in poor
signals back to the Phototach.
NOTE
If balancing large-diameter or high-speed propellers, refer to Chapter 23,
Equipment and Accessory Setup and Troubleshooting for information on
reflective tape width requirements for these applications.
With an inspection mirror, watch the red LED gate indicator light on the aft end of the
Phototach illuminate and extinguish as the tape crosses the beam. This indicates the
position of the tape is correct.
Remove the tape backing and attach the reflective tape to the propeller at that location.
Be sure to smooth out any wrinkles or bubbles in the tape. Ensure the edges are smoothed
and firmly attached. Recheck the previous step to ensure proper placement.
Connect the vibration sensor cable to the sensor connector. Route the cable away from
hot areas and electrical equipment back to the cockpit and attach to the sensor channel
specified in the setup you are using. Secure the cable along its route with duct tape or tie
wraps.
NOTE
IF previously installed trim balance weights are left on prior to starting a dynamic balance, the
total weight and location of each weight will need to be annotated in the analyzer, as shown in
following steps, before a solution can be provided. Alternatively, all trim balance weights can be
removed before proceeding beyond this point. Refer to the ACES Systems’ Guide to Propeller
Balancing (included with your propeller balancing kit) for a full list of FAA-approved inspection
requirements.
Repeat the installation process for the second engine if you have selected a two-engine
balance.
