UMX FPV Radian Manual

16
EN
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
inconsistently from
fl ight to fl ight
Aircraft was not kept immobile for 5
seconds after battery was plugged in
Keep the aircraft immobile for 5 seconds after
plugging in the battery
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)
Propellers are unbalanced, causing
excessive vibration
Remove propellers and rebalance or replace
it if damaged
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, gear or motor Replace damaged parts
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 is 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
process. 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