Apprentice
®
S 2 1.2m
EN
23
Trouble Shooting Guide for SAFE Technology
Problem Possible Cause Solution
Oscillation
Flying over recommended airspeed Reduce air speed
Damaged propeller or spinner Replace propeller or spinner
Imbalanced propeller
Balance the propeller. For more information, view John Redman’s propeller balancing video
at www.horizonhobby.com
Motor vibration Replace parts or correctly align all parts and tighten fasteners as needed
Loose receiver Total system failure. Align and secure receiver in fuselage
Loose aircraft controls Tighten or otherwise secure parts (servo, arm, linkage, horn and control surface)
Worn parts Adjust gain to compensate for parts wear or replace worn parts (especially propeller, pivot points or servo)
Irregular servo rotation Replace servo
Trim is at extreme and
aircraft does not fly
straight or level
Trim is not at neutral If you adjust trim more than 4 clicks, adjust the clevis to mechanically remove trim
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
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