Cessna T210N N6278C

Summary

On 10 September 2008 at about 20:50 local time, a Cessna T210N registered N6278C, operated by JA MAR Industries Inc DBA, was involved in an accident near Oakland, California, United States. 2 people were on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

10 September 2008 at 20:50

Classification

Accident

Location

Oakland, California, United States

Coordinates

37.8333, -122.3133

Aircraft

Cessna T210N

Registration

N6278C

Category

Airplane

Engines

1

Operator

JA MAR Industries Inc DBA

Operating rule

Part 91: General Aviation

Purpose of flight

Business

Phase of flight

Not recorded

Route

San Jose → Unknown

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

LAX08LA292

Nobody was injured.

A loss of engine power while maneuvering due to the disintegration of the number two main bearing, which resulted in a fracture of the crankshaft. Contributing to the accident was inadequate maintenance.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

During a local photo flight at an altitude of 1,500 feet mean sea level (msl), the pilot reported a decrease in engine power followed by a complete loss of engine oil pressure. The pilot determined that due to his location and altitude, he was forced to make a landing on the water. During the landing, the airplane sustained substantial damage to the horizontal stabilizers and to the bottom of the fuselage. During the post-accident investigation, it was determined that the number two and three cylinders had been replaced 137.1 flight hours prior to the accident. During the engine examinations, thermal discoloration of the crankshaft main journals and damage to various other internal components were noted. The crankshaft was fractured just forward of the number two main bearing. The fracture surfaces of the crankshaft were mechanically damaged due to rotational forces. The number two main bearings were not found in the main bearing support diameters. Several bearing fragments were found in the oil sump and on the bearing support diameter. The crankcase itself had been compromised just above the number one cylinder. A review of the maintenance logbooks noted that the engine was beyond manufacturers' recommendations for time between overhaul. Several maintenance discrepancies and non-compliance with manufacturers' recommendations were also noted.

Quoted verbatim from the NTSB record.