Aplus 400, Manual, Page: 6 / 32

Aplus RC Trading Company LTD.
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Main Rotor Checklist
1
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Main rotor housing: When the main rotor housing is worn or faulty, there will be obvious vibration and poor flight
control. Check the main rotor, main shaft, and feathering shaft for wear or deformity. Replace parts as
necessary to eliminate imbalance.
2
．
O-rings: The O-rings will lose their elasticity over time. This will cause excess play on rotor and cause instability.
Replace as needed.
3
．
Main rotor holder: When the heli will not fly or reacts sluggishly, even after checking for proper setting of pitch
and throttle, check the following items:
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Bearings
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Ball bearings
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Rotor blades
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Other parts
4
．
Check for excess play or gaps between the surfaces, missing or broken parts, or binding or restricted movement,
it is important to check for main rotor balance before each flight. Operating the model when out of balance will
cause excessive wear and premature failure of parts, possibly resulting in a dangerous situation.
5
．
Control arm assembly: Check regularly for cracked, worn, bent or binding control arms and pushrods. Smooth
movement of control arms and linkages is required for stable, vibration free flight.
6
．
Swashplate: Check for excess slop in the main ball where the main shaft rides on, and slop or looseness among
all the metal parts. Swashplate wear will result in poor stability and lack of control during flight. Replace as
necessary.