Frankly, I wouldn't bother. Learn to fly. If you're in crash mode then you or the pilot should be thing about getting out of crash mode not trying to pop the chute. This is an easy plane to fly and should not be that easy to get into crash mode. Also the extra servo and chute will add weight that will slow down the response of the plane and make flights shorter. But if you gotta do it. you need to add another servo which takes another channel. You need a drop box and a chute. You need the "drop chute" button to kill the motor and open the drop box. Look at the trainer on towerhobbies.com that has a safety chute for more details. THis needs to be added in a location so that the center of gravity stays exactly where it is now or the plane will become unstable and may be unflyable!