FUTABA GY501 Instruction Manual page 8

F S
OR AFETY
9
Check the remaining receiver and gyro/servo nicd battery
operating time during the adjustment stage and decide how
many flights are remaining.
Never use the transmitter rudder trim in the AVCS mode.
When the rudder is trimmed during flight, the neutral position will
change.
When using the GY501 in the AVCS mode, set revolution mixing
to OFF.