A partial loss of engine power due to fatigue fracture of the power turbine governor spring, causing a false pneumatic signal to the fuel control and a corresponding reduction in fuel flow.
These match the airframe or engine model. Whether each one applies, and whether it's been complied with, depends on serial numbers, equipment and logbook entries. Applicability must be confirmed by a mechanic against the aircraft's records.
No ADs published since 1998 matched this airframe or engine model.
AI-extracted — verify against original. Matched from each AD's applicability section; ADs replaced by a later AD are left out.
Service Difficulty Reports (1)
Reports of failures and defects that operators and repair stations sent to the FAA since 1995. A report describes one finding; it is not an accident.
Engine fuel and control · spring · defectiveApr 24, 2007
DURING LEVEL FORWARD FLIGHT, A SPRING INSIDE THE PT GOVERNOR FAILED, CAUSING THE ENGINE TO GO TO IDLE. AN AUTOROTATION WAS REQUIRED AND WAS DONE SO INTO A SOFT PLOWED FIELD. THE HELICOPTER TURNED OVER AFTER SKIDDING A SHORT DISTANCE.
From FAA Service Difficulty Reports; matched by N-number and serial number.