Accident Cessna 172N VH-UJS, Thursday 2 January 1986

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Date:	Thursday 2 January 1986
Time:	10:20
Type:	Cessna 172N
Owner/operator:
Registration:	VH-UJS
MSN:
Fatalities:	Fatalities: 0 / Occupants: 2
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Agnes Waters, QLD - Australia
Phase:	Landing
Nature:	Private
Departure airport:	YBAF
Destination airport:	Great Keppel Island, QLD
Investigating agency:	BASI
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
The aircraft was being operated on a VFR flight and was cruising at 1500 feet above ground level. The engine suddenly began to run roughly and the RPM dropped to about half the normal setting. Emergency trouble checks failed to alleviate the problem and the pilot transmitted a Mayday call as he tracked towards a nearby strip for a precautionary landing. The approach to this strip was too high and power was applied in an attempt to go around. However, severe engine vibration occurred and the pilot was committed to a forced landing in densely forested, hilly terrain. The power loss and vibration was caused by partial separation of the exhaust valve head on one of the cylinders.

Accident investigation: