What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Aircraft departed Van Nuys Airport, climbed to 3000 feet and established cruise flight. Approxiately 4 minutes into the flight, the left engine back-fired and began to lose power. The crew vertified the failing engine, began shut down procedures, notified the tower and returned to Van Nuys Airport with the left engin feathered. Aircraft was landed without further problems. Engine problem was determined to have been caused by the carburetor.
As the FAA filed it
(-23) AIRCRAFT DEPARTED VAN NUYS AIRPORT, CLIMBED TO 3000 FEET AND ESTABLISHED CRUISE FLIGHT. APPROXIATELY 4 MINUTES INTO THE FLIGHT, THE LEFT ENGINE BACK-FIRED AND BEGAN TO LOSE POWER. THE CREW VERTIFIED THE FAILING ENGINE, BEGAN SHUT DOWN PROCEDURES, NOTIFIED THE TOWER AND RETURNED TO VAN NUYS AIRPORT WITH THE LEFT ENGIN FEATHERED. AIRCRAFT WAS LANDED WITHOUT FURTHER PROBLEMS. ENGINE PROBLEM WAS DETERMINED TO HAVE BEEN CAUSED BY THE CARBURETOR.