SDR CA060417001

Service difficulty report · Engine · Bell 47G4

Difficulty date: April 14, 2006
Submitted: June 6, 2006
Operation: General aviation
Make and model: Bell 47G4
Engine: Lyc VO540B1B3
System (JASC): 8500 · Engine (Reciprocating)
Part: Engine
Condition: Shutdown
Stage of operation: CR
How discovered: O
Nature of condition: Y, J
Precautionary procedure: R, A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

HELICOPTER WAS FLYING ALONG AND ENGINE QUIT, SUCCESSFUL AUTOROTATION WAS ACCOMPLISHED. UPON INVESTIGATION OF ENGINE, IT WAS FOUND THAT NONE OF THE VALVES WERE OPENING OR CLOSING AND THEREFORE SUGGESTS THAT CAM SHAFT IS NOT TURNING OR HAS BROKEN, ENGINE IS BEING SENT FOR TEARDOWN INSPECTION AT THIS TIME.

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