Ensure that the transmitter is turned on. If the Firebird battery is connected before the transmitter is turned on, the motor may spring to life on its own without a signal from the transmitter to regulate it. If the transmitter is already on, check that the trim lever next to the throttle stick is in the neutral position. If it is in the full up position, the motor will run without any stick input. The rubber bands that hold the wing keep sliding off.
Rubber bands become a little loose after repetitive use.
This creates more tension in the rubber band and will hold the wing firmly.