Troubleshooting Guide - BNF UMX Radian Instruction Manual

Troubleshooting Guide

AS3X
Problem
Control surfaces
not at neutral po-
sition when trans-
mitter controls are
at neutral
Model fl ies in-
consistently from
fl ight to fl ight
Controls oscillate
in fl ight, (model
rapidly jumps or
moves)
Problem
Aircraft will Throttle stick and/or throttle trim is too
not respond to high
throttle but re-
Throttle channel is reversed
sponds to other
controls
Motor is disconnected from receiver
Extra propeller Damaged propeller, prop shaft or motor Replace damaged parts
noise or extra
Nut on prop shaft is too loose
vibration
Reduced fl ight Flight battery charge is low
time or aircraft
Propeller is installed backwards
underpowered
Flight battery is damaged
Flight conditions may be too cold
Battery capacity is too low for fl ight
conditions
Possible Cause
Control surfaces may not have been
mechanically centered from factory
Aircraft was moved after the fl ight
battery was connected and before
sensors initialized
Trims are moved too far from neutral
position
Propeller is unbalanced, causing
excessive vibration
Nut on prop shaft is too loose, caus-
ing excessive vibration
Possible Cause
Solution
Center control surfaces mechanically by
adjusting the U-bends on control link-
ages
Disconnect and reconnect the fl ight
battery while keeping the aircraft still for
5 seconds
Neutralize trims and mechanically adjust
linkages to center control surfaces
Remove propeller and rebalance or
replace it if damaged
Tighten the prop shaft nut 1/2 turn
Solution
Reset controls with throttle stick and
throttle trim at lowest setting
Reverse throttle channel on transmitter
Open fuselage and ensure the plug for
the motor is properly installed
Tighten the prop shaft nut 1/2 turn
Completely recharge fl ight battery
Install propeller with numbers facing
forward
Replace fl ight battery and follow fl ight
battery instructions
Make sure battery is warm before use
Replace battery or use a larger capacity
battery
EN
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