Robinsons R66 - 18-40 Main Rotor Blade Angle Rigging

18-40 Main Rotor Blade Angle Rigging
A. Procedure
NOTE
Refer to Section 5-33, and Figures 5-1 & 5-2 for standard rod
end adjustment procedures. Refer to Section 18-13 for main
rotor pitch link adjustment procedure.
1. Perform main rotor flight control rigging per Section 18-30.
2. Level helicopter laterally and longitudinally via main rotor hub per Section 8-12.
3. Perform collective travel rigging per Section 18-41 Parts A and B.
4. Perform cyclic travel rigging per Section 18-42 Parts A, B, C, and D.
5. Perform track and balance per Section 18-10 as required.
B. Measuring Blade Angles
NOTE
Hydraulic flight controls must be pressurized while measuring
blade angles.
WARNING
Never adjust flight controls while hydraulics are pressurized.
Hydraulic forces can cause injury.
1. Teeter main rotor hub until blade tips are approximately level. Place a tracking stick
at the end of one blade and mark the tip height. Rotate the rotor 180° and mark the
opposite blade’s tip height. Teeter main rotor hub as required until blade tips are level
within 1 inch.
2. Refer to Figure 18-10. Using felt tip marker, mark upper surface of both main rotor
blades 49.5 inches inboard of seam between blade tip and tip cover. Lay 1-inch wide
length of masking tape chordwise on each blade, centered over marking. Mark each
rotor blade with a different color designation, such as red and blue.
3. Hang a 6-inch length of masking tape from one blade tip for reference. Zero Kell-Strom
KS113 propeller protractor (or equivalent) on top of the main rotor hub, parallel to the
teeter hinge bolt, at location marked “LEVEL HERE”. During zeroing, point protractor
face toward the blade with hanging tape. When taking blade angle readings, always
point protractor face toward the blade with hanging tape.
4. Position MT525-1 fixture on top of the blade’s tape at 49.5 inches, and tight against
the leading edge. Position protractor on top of fixture, point protractor face toward the
blade with hanging tape, and take blade angle reading.
SEP 2012 R66 Maintenance Manual Chapter 18 Track and Balance Page 18.23