I was out for some sunset shots this evening and when I was running through the preflight I always check the radio to make sure that all switches are in the right position and functioning properly. This time I had my Daughter with me. When running through the preflight I always check the radio section of the app and make sure that all of the controls and switches are doing what they need to be doing and are in the right position. I had just explained the Disarm Safety switch (I have it set to a spring loaded switch so you have to hold it up to turn off Disarm Safety) I moved the Throttle down and to the left and then to the right and the motors started. I had not noticed the LED's changing to solid and I was very surprised to see the motors start. So surprised that I started this thread and upon doing some research am now editing it. I thought there was some kind of software failure that allowed me to accidentally arm and start the motors. After a little research, I found that you do not have to move the Disarm Safety switch to arm and start the motors, you just have to hold it up (turn it off) to stop the motors. I had always been holding it up to Arm the Alta, so when the motors started it was a complete surprise. I think this is a safety issue. Moments before the accidental motor start my daughter was standing right next to the Alta and she could have been seriously injured. The only safety you have now is flashing LED's giving a visual warning that the Alta is not armed and ready to start. I think it would be a much better idea to require turning off the Disarm Safety switch to arm the Alta and prepare for the motor start. A couple of bumps of the stick can easily start the motors. Any thoughts from the group.