18-13 Track Adjustment (continued)
B. Main Rotor Blade Trim Tab
NOTE
To correct for a "climbing" blade condition (blade spread that
exceeds 3/8 inch with forward airspeed), bend high blade trim
tab down.
CAUTION
Do not use other helicopter manufacturers' trim tab bending
tools. Use of these tools will damage Robinson blades.
CAUTION
MT352-1 gage must contact trim tab trailing edge. If gage
does not contact tab trailing edge, tab is bent beyond limit.
CAUTION
Tighten MT526-8 bending tool bolt to bend tab; do not use tool
as a lever.
CAUTION
Bend tab upward only when absolutely necessary; bending tab
upward can increase rotor vibration.
1. Using felt tip marker, ink mark main rotor blade trim tab per Figure 18-4. Mark
line with a measuring point in the center of the tab (approximate).
2. Position MT352-1 gage chordwise across blade upper surface and tab trailing
edge. Zero dial indicator on measuring point.
3. Position MT526-8 bending tool on tab per Figure 18-4. Slide tool completely over
tab until tool stops contact blade trailing edge. Double-rib side of tool should
contact tab upper surface to bend tab down. Double-rib side of tool should
contact tab bottom surface to bend tab up.
4. Tighten MT526-8 bending tool bolt to bend tab. Make slight bends and re-
measure tab with MT352-1 gage. Bend trim tab 0.015 inch (down) to effect
dynamic movement of main rotor blade tip approximately 0.2 inch (downward).
APR 2017 Chapter 18 Track and Balance Page 18.9
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