EA-50 pilot reported loss of reliable airspeed indication and autopilot during arrival. During approach; one landing gear would not extend. Pilot diverted and after completing manual gear extension; landed safely.

Narrative

This was a flight from ZZZ to ZZZ1 in an Eclipse Jet (EA-50) single pilot; on the morning of Day 0. Initially on the arrival about 40 miles East of the ZZZ NAVAID we had an airspeed indication issue in which we lost reliable airspeed from all sources. At this point we lost autopilot. We were unable to regain airspeed indication or autopilot. Due to weather also being a factor we [requested priority handling] at this point and requested direct to ZZZ1 with deviations to maintain clear of IMC as best as possible. We broke out of the clouds after a descent to about 4;100 feet and abeam the airport coming from the North. Once we were in VMC; we entered the pattern to land South at ZZZ1. On our downwind leg we had a gear indication of nose and right main gear down and locked and the left main up and locked. We proceeded with a low pass of the ZZZ1 Tower who confirmed visually that the left main gear appeared up. We initiated a go around. We switched back to Approach Control who gave us vectors until we were able to run all our applicable checklists. I had already decided that we would not return to ZZZ1 because ZZZ2 was just as close and had better emergency services and much longer and wider runways to choose from. We received vectors for about 10 minutes while running checklists in VMC conditions trying to get the gear to come down. Finally; we ran the emergency gear extension checklist. We were successful in get a three gear down and locked indication (three green; no red). ATC had suggested that ZZZ3 was nearby with long and wide runways and adequate emergency services. ZZZ3 was acceptable to me so we chose to attempt a landing there. We accomplished a safe visual approach and landing with all three gear down and locked. We landed on Runway XXL safely and brought the airplane to a stop on the runway were we shut the plane down and evacuated the airplane. Once emergency services arrived; found the scene safe; and after passengers were able to be escorted to the ramp; we were able to safely tow the airplane to the ramp as well. A post flight inspection revealed that the probable cause of the airspeed indication issue was likely to be computer/software related and the gear issue was likely to be a bad solenoid. However; this is just theory and a maintenance team is working now to determine the actual cause of the failures. ATC on all frequencies as well as the ground team at ZZZ3 were extremely professional and accommodating during our incident. I cannot praise them enough for helping to get us down safely.