Yes it was running and tested at all diffrent RPMs. Most of the trouble with the Hitec recievers came at close range with ant up or down. Same check with the Airtronics RX was OK on the ground but in the air the plane just flat flew funny. I keep on eather over controling or under controling it and I could not get it to trim out right. I have used this Tx in a Sig something extra for some time and seldom flew it because it flew the same way and I allways thought it was the plane. I am now using Airtronics TXes in both planes and they are both fine. I sent the TX in to have it checked so Ill see what what happens or what they find out