PROCEDURE 3: H-60 SERIES AIRCRAFT TRIM TAB ADJUSTMENTS
Trim tab adjustments change the vertical track of a
Bending a trim tab down will cause a blade to dive with
Bending a trim tab up will cause a blade to climb with
Mark tab measurement stations as shown in figure 10. Use light colored paint or non-corrosive marker to
accurately define each station on the trailing edge.
Set measuring plate on the blade surface, aligning the three vertical pins with the trailing edge of the trim tab
(see figure 10).
Measure and record the tab setting at each of the six trim tab measuring stations. Ensure that the center pin is
right over the station mark.
Figure 10. Trim Tab Measurement
Remove the measuring plate and set aside for use during bending process.
If a blade is to be tabbed up, the table correction (the
number of mils recommended on the diagnostics screen
of the AVA) is to be added to the initial measurement. If
a blade is to be tabbed down, then the table correction
(the number of mils recommended on the diagnostics