Pilot reported an evasive taxi off runway to avoid a collision with NORDO landing aircraft. Pilot of the landing aircraft reported they conducted a go around on short final approach when visual contact with the other aircraft was established.
Synopsis
Pilot reported an evasive taxi off runway to avoid a collision with NORDO landing aircraft. Pilot of the landing aircraft reported they conducted a go around on short final approach when visual contact with the other aircraft was established.
Narrative
I was in my 414 with my wife. We stopped for fuel. I was about to taxi out on Runway X at ZZZ. VFR conditions. No taxiway. So before I back taxied on Runway X I announced on Unicom that I was going to back taxi on Runway X and I looked in both directions and saw no planes on final approach. I proceeded to back taxi and about 1k ft down the runway I see a plane on about a 1.5 mile final. I radioed 3 times and said I am taxiing go around. He did not answer me. I have a witness who was also in his plane with the radio on waiting for me to take off. I stopped and watched this RG continue to land so I taxied off the runway on the grass. It was soft grass and muddy so I still had my tail sticking out on the runway. I shut my plane off immediately. The RG pilot touched down; then finally saw me and did a go around. After he landed I was very upset he didn't have his radio on. Also that he didn't see us until after he touched down. He was an elderly man who in my opinion should not be flying. My plane needed a tow but a local mechanic cleaned up the wheels. I ran it up and everything was fine and proceeded with my flight back to ZZZ1.
Second reporter narrative
Flying final at ZZZ to Runway X. Aircraft was taxing back to Runway X for takeoff. I inadvertently had my radios on a other than CTAF (I thought i was on the correct frequency but it was on the other radio). I didn't notice the back taxing aircraft until on very short final who had taxied off the runway into the grass with its tail extending over the runway. When i noticed the airplane i went around. No damage was done and I landed uneventful. The other aircraft wasn't damaged. Recommend that all non controlled airports have taxiways to the end of the runway so back taxi not required
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.