Cessna 182 N7302S

Summary

On 1 May 2019 at about 18:00 local time, a Cessna 182 registered N7302S, operated by Air Carriage Inc, was involved in an accident near Mill Creek, California, United States. 3 people were on board and one died, 2 were seriously injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

1 May 2019 at 18:00

Classification

Accident

Location

Mill Creek, California, United States

Coordinates

40.3600, -121.5106

Aircraft

Cessna 182

Registration

N7302S

Category

Airplane

Year built

1976

Engines

1

Operator

Air Carriage Inc

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Chico → Chico

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

WPR19FA126

1 person died.

A total loss of engine power due to oil starvation as a result of the failure of a gasket on the oil filter adapter and the pilot’s inability to clear power lines during the emergency landing.  

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

Read the full NTSB narrative

The pilot and two passengers departed on a sightseeing flight over mountainous terrain. About 30 minutes into the flight, the engine lost partial power and smoke began to enter the cockpit. The pilot turned the airplane toward a grassy meadow for a forced landing. While approaching the field, the pilot suddenly saw power lines immediately ahead and attempted to maneuver the airplane below them. The airplane contacted the wires and came to rest inverted. Postaccident examination revealed several holes in the engine crankcase. The oil filter adapter was found loose and the fiber gasket was protruding beyond the castings. Removal of the oil filter adapter revealed that the fiber gasket was split. The failure of the gasket allowed oil to exit the engine, resulting in oil starvation and the subsequent catastrophic failure.   During postaccident testing, the gasket failure seen in the accident adapter could not be replicated, and the reason for the failure could not be determined. The testing did reveal that the adapters were difficult to install properly, and on some occasions, when the proper torque was achieved, the adapter housing could still be rotated about the hub when hand pressure was applied. In response to the accident and testing, the supplemental type certificate (STC) holder issued a service bulletin (SB) that stated that the adapter should be inspected for oil leakage and gasket damage. The SB also provided detailed instructions to eliminate and identify rotation of the housing during and after installation. The purpose of the oil filter adapter was to enable use of a conventional spin-on oil filter. The adapter was installed on the engine about 2 years before the accident; the engine had accrued about 340 hours since that time. There were no documents regarding the installation of the oil filter adapter, and it is unknown how it was installed or if new gaskets were used at the time of installation. Maintenance records indicated that the oil filter was changed 7 times between the engine installation and the accident. The last maintenance performed on the airplane was an annual inspection completed 5 days and about 9.4 flight hours before the accident. During this maintenance, the oil filter and the vacuum pump accessory driveshaft seal were replaced. It is possible that the vacuum pump seal was replaced because the mechanics thought it was leaking due to the presence of oil in the engine compartment. This may have been the first indication that the oil filter adapter was beginning to leak.

Quoted verbatim from the NTSB record.