As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOOSE RETAINING NUTS WORKED OFF STUDS ALLOWING THE PORT COVER TO FALL OFF AND NR 2 CYLINDER INTAKE VALVE ROCKER ARM SHAFT TO FALL OUT OF THE ENGINE RESULTING IN A CRASH LANDING. SUGGEST REVIEWING ENSTROM PRODUCTION CERTIFICATE AND TIGHTEN THE INSPECTION PROCEDURE TO REDUCE THE CHANCES THAT ANOTHER HELICOPTER WILL BE RELEASED WITH HIDDEN LOOSE PARTS.