Gen II User Manual
4-17 – Propeller Balance Chapter 4 Revision 2.2, Apr 2020
indicate the direction of increasing hole numbers as viewed from forward looking
aft.
4.1.1.4.5. Move to the “Max H. Wt” field using the [] key. Using the keypad, enter the
maximum allowable weight (in grams) for any single hole. If you do not know
this value, refer to the aircraft maintenance manual or the ACES Guide to
Propeller Balancing. Use the [] key to move to the next field.
4.1.1.4.6. Complete the next fields differently depending on data you input in paragraph
4.1.1.4.3 above.
If you selected “Even” in paragraph 4.1.1.4.3 - The “Enter the Angle of No. 1
Hole” field is displayed. Use the keypad to enter the angle of hole number 1 as
viewed from the front of the engine looking aft. To determine this angle, do the
following:
With mag switches OFF, rotate the propeller so the tachometer triggering
device (magnetic interrupter, reflective tape, etc.) is at top dead center.
With the propeller in this position, use the 12:00 position as the “0” or
“360 degrees” (index point) and measure opposite the direction of rotation
to the angle of hole number 1. For example, if the #1 hole is at the 3:00
position (simply as viewed on the face of a clock from in front of the
engine, disregarding propeller direction of rotation) and the engine rotates
counterclockwise, the angle would be 90 degrees. If the #1 hole is at the
3:00 position and the engine rotates clockwise it would be 270 degrees.
The measurement to hole # 1 must always be measured opposite the
direction of rotation regardless of the hole numbering direction.
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