On February 13, 1987, a Hughes 269A (registration N3782B) operated by Metro Flight Services,inc. was involved in an aviation accident near Buford, GA. Investigators recorded the probable cause as: Fatigue failure of a rod cap bolt and subsequent separation of the rod from the crankshaft. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A low-time helicopter pilot experienced an engine failure over a parking lot and lake. The helicopter slowed, emitted smoke from the engine area, fishtailed, and dropped nose first into the water, sinking immediately. Investigation found a fatigue failure of a rod cap bolt.
Event Description
During a flight, the helicopter was observed to decelerate over a parking lot before proceeding over a lake. A puff of smoke appeared around the rear of the engine area. The helicopter then fishtailed and nearly came to a complete stop before it dropped nose first into the water, sinking almost immediately.
Investigation Findings
Examination of the aircraft revealed a hole in the crankcase. The fracture surfaces indicated an internal-to-external puncture. Further inspection identified a fatigue failure of a rod cap bolt, which led to the separation of the rod from the crankshaft. Extensive damage to internal engine components was observed.
Pilot Information
The pilot was a low-time helicopter pilot who could not swim and was afraid of water.
Probable cause
Fatigue failure of a rod cap bolt and subsequent separation of the rod from the crankshaft.
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