18-42 Cyclic Travel (continued)
C. Cyclic Forward
1. Position collective stick full down. Position cyclic stick in the lateral neutral (5
inches to left of right stop) position, and against forward stop. Apply control
frictions; sandbag cyclic stick as required.
2. Rotate blades so pitch links are aligned with helicopter longitudinal axis.
3. Measure and record blade angles per § 18-40 Part B to determine the values below.
Rotate blades 180° and align per step 2 as required.
BLUE BLADE RED BLADE
Pitch horn forward ° Pitch horn forward °
Pitch horn aft + ° Pitch horn aft + °
= ° = °
÷ 2 = ° ÷ 2 = °
4. Blade angles must average between 13.50° and 14.25° for cyclic forward position.
Adjust swashplate aft push-pull tube as required (one full turn = 0.44°). A coarse
adjustment can be made by adjusting swashplate forward push-pull tubes exactly
the same amount (one full turn = 0.6°).
D. Cyclic Aft
1. Position collective stick full down. Position cyclic stick in the lateral neutral (5
inches to left of right stop) position, and against aft stop. Apply control frictions;
sandbag cyclic stick as required.
2. Rotate blades so pitch links are aligned with helicopter longitudinal axis.
3. Measure and record blade angles per § 18-40 Part B to determine the values below.
Rotate blades 180° and align per step 2 as required.
BLUE BLADE RED BLADE
Pitch horn forward ° Pitch horn forward °
Pitch horn aft + ° Pitch horn aft + °
= ° = °
÷ 2 = ° ÷ 2 = °
4. Blade angles must average between 13.50° and 14.25° for cyclic aft position.
Adjust swashplate aft push-pull tube as required (one full turn = 0.44°). A coarse
adjustment can be made by adjusting swashplate forward push-pull tubes exactly
the same amount (one full turn = 0.6°).
NOTE
Remeasure cyclic forward blade angles after making adjustment
for cyclic aft blade angles.
MAY 2015 Chapter 18 Track and Balance Page 18.27
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