E-flite UMX Yak 54 180 BNF - Manual (Page 13)

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AS3X
Problem Possible Cause Solution
Control surfaces not at
neutral position when
transmitter controls are
at neutral Control surfaces may not have been
mechanically centered from factory Center control surfaces mechanically by
adjusting the U-bends on control linkages
Aircraft was moved after the fl ight battery
was connected and before sensors
initialized Disconnect and reconnect the fl ight battery
while keeping the aircraft still for 5 seconds
Model fl ies inconsis-
tently from fl ight to
fl ight Trims are moved too far from neutral
position Neutralize trims and mechanically adjust
linkages to center control surfaces
Controls oscillate in
fl ight, (model rapidly
jumps or moves) Propeller is unbalanced, causing excessive
vibration Remove propeller and rebalance or replace it
if damaged
Prop screw is too loose, causing vibration Tighten the prop screw
Problem Possible Cause Solution
Aircraft will not respond
to throttle but responds
to other controls Throttle stick and/or throttle trim too high Reset controls with throttle stick and throttle
trim at lowest setting
Throttle channel is reversed Reverse throttle channel on transmitter
Motor disconnected from receiver Open fuselage and make sure motor is
connected to the receiver
Extra propeller noise or
extra vibration Damaged propeller, spinner or motor Replace damaged parts
Prop screw is too loose Tighten the prop screw
Prop is out of balance Remove and balance propeller, or replace
with a balanced propeller.
Reduced fl ight time or
aircraft underpowered Flight battery charge is low Completely recharge fl ight battery
Propeller installed backwards Install propeller with numbers facing forward
Flight battery damaged Replace fl ight battery and follow fl ight battery
instructions
Flight conditions may be too cold Make sure battery is warm before use
Battery capacity too low for fl ight conditions Replace battery or use a larger capacity
battery
LED on receiver fl ashes
and aircraft will not bind
to transmitter (during
binding) Transmitter too near aircraft during binding
process Power off transmitter, move transmitter a
larger distance from aircraft, disconnect and
reconnect fl ight battery to aircraft and follow
binding instructions
Bind switch or button not held long enough
during bind process Power off transmitter and repeat bind pro-
cess. Hold transmitter bind button or switch
until receiver is bound
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
Troubleshooting Guide