What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Pilot was on a maintenance flight with his mechanic while trouble shooting an oil temp gauge problem. While turning base from the downwind leg they were discussing power settings for use in the pattern as the pilot was concerned with shock cooling his engine. The conversation distracted them to the point that neither pilot nor passenger (mechanic) realized that the gear was not down. The distraction resulted in a gear up landing of the aircraft. Minor damage to the fuselage and prop strike were the only damages.
As the FAA filed it
PILOT WAS ON A MAINTENANCE FLIGHT WITH HIS MECHANIC WHILE TROUBLE SHOOTING AN OIL TEMP GAUGE PROBLEM. WHILE TURNING BASE FROM THE DOWNWIND LEG THEY WERE DISCUSSING POWER SETTINGS FOR USE IN THE PATTERN AS THE PILOT WAS CONCERNED WITH SHOCK COOLING HIS ENGINE. THE CONVERSATION DISTRACTED THEM TO THE POINT THAT NEITHER PILOT NOR PASSENGER (MECHANIC) REALIZED THAT THE GEAR WAS NOT DOWN. THE DISTRACTION RESULTED IN A GEAR UP LANDING OF THE AIRCRAFT. MINOR DAMAGE TO THE FUSELAGE AND PROP STRIKE WERE THE ONLY DAMAGES.