Apprentice
®
S 2 1.2m
EN
21
Trouble Shooting Guide
Problem
Possible Cause
Solution
Aircraft will not respond
to throttle but responds to
other controls
Throttle not at lowest position or throttle trim too high
Reset controls with throttle stick and throttle trim at
lowest setting
Throttle servo travel is lower than 100%
Make sure throttle servo travel is 100% or greater
Throttle channel is reversed
Reverse throttle channel on transmitter
Motor disconnected from ESC
Make sure motor is connected to the ESC
Extra propeller noise or extra
vibration
Damaged propeller and spinner, collet or motor
Replace damaged parts
Propeller is out of balance
Balance or replace propeller
Prop nut is too loose
Tighten the prop nut
Spinner is not tight or fully seated in place
Tighten the spinner or remove the spinner and turn
it 180 degrees
Reduced flight time or
aircraft underpowered
Flight battery charge is low
Completely recharge flight battery
Propeller installed backwards
Install propeller with numbers facing forward
Flight battery damaged
Replace flight battery and follow flight battery
instructions
Flight conditions may be too cold
Make sure battery is warm before use
Battery capacity too low for flight conditions
Replace battery or use a larger capacity battery
Aircraft will not Bind (during
binding) to transmitter
Transmitter too near aircraft during binding process
Move powered transmitter a few feet from aircraft,
disconnect and reconnect flight battery to aircraft
Aircraft or transmitter is too close to large metal object, wireless source or
another transmitter
Move aircraft and transmitter to another location and
attempt binding again
The bind plug is not installed correctly in the bind port
Install bind plug in bind port and bind the aircraft to
the transmitter
Flight battery/transmitter battery charge is too low
Replace/recharge batteries
Bind switch or button not held long enough during bind process
Power off transmitter and repeat bind process. Hold
transmitter bind
button or switch until receiver is bound
Aircraft will not connect
(after binding) to transmitter
Transmitter too near aircraft during connecting
process
Move powered transmitter a few feet from aircraft,
disconnect and reconnect
flight battery to aircraft
Aircraft or transmitter is too close to large metal
object, wireless source or another transmitter
Move aircraft and transmitter to another location and
attempt connecting again
Bind plug left installed in bind port
Rebind transmitter to the aircraft and remove the
bind plug before cycling power
Aircraft bound to different model memory
(ModelMatch
TM
radios only)
Select correct model memory on transmitter
Flight battery/Transmitter battery charge is too low
Replace/recharge batteries
Transmitter may have been bound using different DSM protocol
Bind aircraft to transmitter
Control surface does not
move
Control surface, control horn, linkage or servo
damage
Replace or repair damaged parts and adjust controls
Wire damaged or connections loose
Do a check of wires and connections, connect or
replace as needed
Transmitter is not bound correctly or the incorrect model was selected
Re-bind or select correct model in transmitter
Flight battery charge is low
Fully recharge flight battery
BEC (Battery Elimination Circuit) of the ESC is
damaged
Replace ESC
Controls reversed
Transmitter settings are reversed
Perform the Control Direction Test and adjust the
controls on transmitter
appropriately
Motor power pulses then
motor loses power
ESC uses default soft Low Voltage Cutoff (LVC)
Recharge flight battery or replace battery that is no
longer performing
Weather conditions might be too cold
Postpone flight until weather is warmer
Battery is old, worn out, or damaged
Replace battery
Battery C rating might be too small
Use recommended battery
Aircraft control surfaces do
not move after switch is
turned on
Aircraft was moving during initialization
Keep aircraft still during initialization