CHESTER, CT, USA
N158Y
Davis D1K
THE PILOT DEPARTED WITH A GLIDER IN TOW AND LOST POWER. HE CUT AWAY THE GLIDER WHICH LANDED WITH MINOR DAMAGE AND LANDED THE AIRPLANE IN A WOODED AREA. EXAMINATION OF THE ENGINE REVEALED IT WAS BEING OPERATED WITH AUTO GAS WITHOUT AN STC. A COMPRESSION CHECK THAT MEETS FAA SPECIFICATIONS HAD NOT BEEN CONDUCTED ON THE ENGINE SINCE 1963, AND CARBON LIKE COMBUSTION DEPOSITS HAD BUILT UP ON THE EXHAUST VALVE IN THE NUMBER 3 CYLINDER, KEEPING THE EXHAUST VALVE FROM CLOSING. THE AIRPLANE AND ENGINE WERE 6 HOURS OUT OF AN ANNUAL INSPECTION.
IMPROPER MAINTENANCE ON THE ENGINE WHICH RESULTED IN A POWER LOSS DUE TO A STUCK EXHAUST VALVE AND SUBSEQUENT FORCED LANDING IN UNSUITABLE TERRAIN.
Source: NTSB Aviation Accident Database
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