Small Aircraft; High Wing; 1 Eng; Fixed Gear
Communication Breakdown; Situational Awareness
Conflict Ground Conflict; Critical
Procedure; Airport; Human Factors
I had just fueled up. The fuel pump is about 800 feet down the runway from the beginning of Runway 31. Traffic had been using Runway 31 and it is downhill. From the beginning of Runway 31 you can not see the last 2;000 feet of the runway because of the slope. From the gas pump I could see the entire runway. I announced over the correct frequency. I saw no one on approach for either runway. I announced 'Aircraft X back taxi on Runway 13 for a 31 departure'. I was heard but my volume was down and I received no transmissions throughout the event. Evidently the Stearman was on base to 13 when I announced and took the runway.At that time of day the sun was in a low position and could have obscured my ability to see the aircraft. While I was back taxiing the last 800 feet of Runway 13 the Stearman landed on Runway 13. There is no way I could see him behind me. At the end of Runway 13 I did a quick mag check and announced 'Aircraft X taking off runway 31'. I was airborn by the point about 600 feet to 800 feet down the runway when you can see the rest of the runway. The Stearman had just exited the runway on his taxiway about 300 feet in front of me. He was off the runway as I had a clear view out my right side window.My volume was down and I could not hear responses. The sun was low blocking the Stearman on base. Even though another aircraft was in the pattern for Runway 31; the Stearman chose to land opposite direction and also with me on the runway assuming I would hear his warning. It is not uncommon to land uphill on [Runway] 13 to reduce landing distance.
A pilot back taxiing to depart a non towered airport reported an aircraft landed opposite direction.