What aircraft was involved and where did it happen?

The accident on 1996-05-28 involved a Cessna 177B, registration N19708, at Chatham, MA.

What was the probable cause of the accident?

failure of the oil pump, which resulted in oil starvation and subsequent failure of the number two and four cylinder connecting rods. Also causal was inadequate maintenance by noncompliance with the airworthiness directive that required replacement of the oil pump.

Engine Power Loss Results in Forced Landing to Pond (N19708)

On May 28, 1996, a Cessna 177B (registration N19708) was involved in an aviation accident near Chatham, MA. Investigators recorded the probable cause as: failure of the oil pump, which resulted in oil starvation and subsequent failure of the number two and four cylinder connecting rods. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

A pilot/owner experienced engine power loss 4 miles from destination, with smoke, oil, and flames. A forced landing was made to a pond. Examination revealed oil pump failure and connecting rod separation; an airworthiness directive was not complied with.

Accident Overview

The pilot/owner was 4 miles from the destination airport when the engine lost power. White smoke, oil, and flames were observed from under the engine cowling. The engine lost all power, and the pilot executed a forced landing to a pond.

Engine Examination

Examination of the engine determined that the oil pump had failed. Additionally, the connecting rods for cylinders number two and four had separated from the crankshaft.

Airworthiness Directive Compliance

FAA Airworthiness Directive AD 81-18-04, issued in 1981, required replacement of the oil pump sintered iron impellers within 25 hours of service after the effective date. The airplane's maintenance records indicated that this AD had not been complied with; it had been signed off as not applicable until the 2,000-hour engine overhaul. The engine had accumulated over 1,500 hours since the AD was issued.

Pilot and Maintenance History

The pilot/owner held a certified airframe and power plant mechanic certificate. He had performed four of the airplane's last six annual inspections. The final two annual inspections were conducted by another mechanic.

1996-05-28: Cessna 177B (N19708) — Chatham, MA