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Problem Possible Cause Solution
Battery is bulging after flight Battery is damaged Replace battery
Green LED flashes slowly Low battery voltage Land immediately and charge the battery
Green LED flashes rapidly Helicopter is in bind mode Power off helicopter and transmitter and repeat bind process
Green LED turns off and the
blue LED illuminates
Helicopter lost connection with the
transmitter
Rebind the transmitter to the receiver
Green and blue LEDs turn off Battery connection error Reconnect or replace the battery
Green LED is illuminated and
blue LED turns off
Helicopter calibrate function not
activated
Place the helicopter on a level surface and move the calibrate
switch to the green position
The motor does not spin but the
servos operate normally
Throttle cut function is activated Set the throttle cut switch to the green dot position
Helicopter control response is
inconsistent or requires extra
trim to neutralize movement
Aircraft was not initialized properly
Disconnect the flight battery, center the transmitter control
trims and re-initialize the helicopter
Vibration is interfering with the sensor
operation
Check all rotating parts for damage and replace as necessary
Make sure the receiver unit is securely attached to the frame
Helicopter will not
respond to throttle
Throttle is inactive due to safety lock
See Takeoff in the Flying the 150 FX section for instructions to
activate the throttle
Throttle too high and/or throttle trim is
too high
Disconnect the flight battery, place the throttle stick in the
lowest position and lower the throttle trim a few clicks. Con-
nect the flight battery and allow the model to initialize
Helicopter moved during initialization
Disconnect the flight battery and re-initialize the helicopter
while keeping the helicopter from moving
Helicopter has
reduced ight time
or is underpowered
Flight battery charge is low Completely recharge the flight battery
Flight battery is damaged
Replace the flight battery and follow the flight battery instructions
Flight conditions might be too cold Make sure the battery is warm (room temperature) before use
Debris in or around the rotating parts Clean all rotating parts
Ball Links
Make sure the plastic ball link holds the control ball, but is not tight (binding) on the ball. When a link is too loose on the
ball, it can separate from the ball during flight and cause a crash. Replace worn ball links before they fail.
Cleaning Make sure the battery is not connected before cleaning. Remove dust and debris with a soft brush or a dry, lint-free cloth.
Bearings Replace bearings when they become notchy (sticky in places when turning) or draggy.
Wiring Make sure the wiring does not contact moving parts. Replace damaged wiring and loose connectors.
Fasteners
Make sure there are no loose screws, other fasteners or connectors. Do not over-tighten metal screws in plastic parts.
Tighten screws so the parts are mated together, then turn the screw only 1/8th of a turn more.
Rotors
Make sure there is no damage to rotor blades and other parts which move at high speed. Damage to these parts includes
cracks, burrs, chips or scratches. Replace damaged parts before flying. Verify both main rotor blades have the correct
and equal tension in the blade grips. When the helicopter is held up sideways, the main blades should support their own
weight. When the helicopter is shaken lightly, the blades should fall.
Tail Inspect the tail rotor for damage and replace if necessary. Inspect the tail boom for any damage and replace if necessary.
Mechanics
Inspect the main frame and landing gear for damage and replace if necessary. Check the mainshaft for vertical play. Verify that
the main gear mesh is correct and that no tight spots exist in the 360 degree rotation. Replace components as necessary.
Troubleshooting Guide
Post-Flight Inspection and Maintenance Checklist
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