Page 18.24 Chapter 18 Track and Balance R66 Maintenance Manual SEP 2012
18-41 Collective Travel
NOTE
Lengthening pitch links increases blade angles.
NOTE
When making adjustments, keep pitch links as close to neutral
(mid-travel) position as possible to preserve the adjustment
range for flight checks.
A. Collective Down
1. Refer to Figure 18-8. Position collective stick full up and apply friction. Place
MT759-1 rigging blocks around cyclic stick in cyclic box assembly. Verify top of ball
is flush with tube within 0.030 inch. Adjust all swashplate push-pull tubes exactly
the same amount as required (one full turn = 0.48°).
2. Position collective stick full down and apply friction.
3. Rotate blades so pitch links are aligned with helicopter longitudinal axis.
4. Measure and record blade angles per Section 18-40 Part B to determine the values
below. Rotate blades 180° and align per step 3 as required.
BLUE BLADE RED BLADE
Pitch horn forward ° Pitch horn forward °
Pitch horn aft + ° Pitch horn aft + °
= ° = °
÷ 2 = ° ÷ 2 = °
5. Blade angles must average between 1.0° and 2.0° for collective down position.
(Final blade angle for collective down position is determined during autorotation rpm
adjustment.) Adjust main rotor blade pitch links per Section 18-13 as required (one
full barrel turn = 0.72°) until blade angles, when blades are positioned pitch horn
forward, are within 0.2°. Adjust pitch links until blade angles, when blades are
positioned pitch horn aft, are also within 0.2°.
NOTE
After making adjustments, position collective stick full up and
apply friction. Verify top of swashplate ball is flush with tube
within 0.030 inch per Figure 18-8. Adjust all swashplate push-
pull tubes exactly the same amount as required (one full turn =
0.48°). Lengthening all push-pull tubes increases blade angles.
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