What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
On January 4, 2017, about 1430, an experimental amateur-built Schosanski, Cozy Mk IV R airplane, N4518S, experienced a total loss of engine power after an attempted go-around during a touch-and-go landing at Napa county airport (apc), Napa, California. The pilot subsequently made a forced landing a marsh short of the runway. The airplane was registered and operated by the privacy data omittedpilot. The commercial rated pilot was not injured. The airplane sustained substantial damage to the left wing. The local personal flight departed Napa, California, about 1400 PST. Visual meteorological conditions prevailed and no flight plan was filed.
The pilot reported that he was in the traffic pattern performing touch-and-go landings on runway 24. During approach, the pilot noted that the airplane would have landed further down the runway than desired and he initiated a go-around. As he advanced the throttle, the engine responded normally, but then rolled back to idle. The pilot made a forced landing in marsh area ¼ mile past the end of runway 24. The aircraft came to rest in a shallow drainage canal. The airplane was powered by an automotive mazda rotary engine, which was modified by the owner. The airplane was recovered for further examination. The owner determined the loss of power was due to the failure of the apex rotary piston seal creating a loss of power. The mazda 13B automotive engine was believed to be manufactured in 1991 the aircraft owner/builder perched it used and has no idea how many miles/hours it has accumulated.
As the FAA filed it
ON JANUARY 4, 2017, ABOUT 1430, AN EXPERIMENTAL AMATEUR-BUILT SCHOSANSKI, COZY MK IV R AIRPLANE, N4518S, EXPERIENCED A TOTAL LOSS OF ENGINE POWER AFTER AN ATTEMPTED GO-AROUND DURING A TOUCH-AND-GO LANDING AT NAPA COUNTY AIRPORT (APC), NAPA, CALIFORNIA. THE PILOT SUBSEQUENTLY MADE A FORCED LANDING A MARSH SHORT OF THE RUNWAY. THE AIRPLANE WAS REGISTERED AND OPERATED BY THE ^PRIVACY DATA OMITTED^PILOT. THE COMMERCIAL RATED PILOT WAS NOT INJURED. THE AIRPLANE SUSTAINED SUBSTANTIAL DAMAGE TO THE LEFT WING. THE LOCAL PERSONAL FLIGHT DEPARTED NAPA, CALIFORNIA, ABOUT 1400 PST. VISUAL METEOROLOGICAL CONDITIONS PREVAILED AND NO FLIGHT PLAN WAS FILED.
THE PILOT REPORTED THAT HE WAS IN THE TRAFFIC PATTERN PERFORMING TOUCH-AND-GO LANDINGS ON RUNWAY 24. DURING APPROACH, THE PILOT NOTED THAT THE AIRPLANE WOULD HAVE LANDED FURTHER DOWN THE RUNWAY THAN DESIRED AND HE INITIATED A GO-AROUND. AS HE ADVANCED THE THROTTLE, THE ENGINE RESPONDED NORMALLY, BUT THEN ROLLED BACK TO IDLE. THE PILOT MADE A FORCED LANDING IN MARSH AREA ¼ MILE PAST THE END OF RUNWAY 24. THE AIRCRAFT CAME TO REST IN A SHALLOW DRAINAGE CANAL. THE AIRPLANE WAS POWERED BY AN AUTOMOTIVE MAZDA ROTARY ENGINE, WHICH WAS MODIFIED BY THE OWNER. THE AIRPLANE WAS RECOVERED FOR FURTHER EXAMINATION. THE OWNER DETERMINED THE LOSS OF POWER WAS DUE TO THE FAILURE OF THE APEX ROTARY PISTON SEAL CREATING A LOSS OF POWER. THE MAZDA 13B AUTOMOTIVE ENGINE WAS BELIEVED TO BE MANUFACTURED IN 1991 THE AIRCRAFT OWNER/BUILDER PERCHED IT USED AND HAS NO IDEA HOW MANY MILES/HOURS IT HAS ACCUMULATED.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.