Wednesday, June 12, 2019

Cessna 210D Centurion, N3997Y: Accident occurred June 10, 2019 at Ramona Airport (KRNM), San Diego County, California

The National Transportation Safety Board did not travel to the scene of this accident.

Additional Participating Entities:
Federal Aviation Administration / Flight Standards District Office; San Diego, California
Continental Motors; Mobile, Alabama
Textron Aviation - Cessna; Wichita, Kansas

Aviation Accident Preliminary Report - National Transportation Safety Board:

Location: Romona, CA
Accident Number: WPR19LA166
Date & Time: 06/10/2019, 1245 PDT
Registration: N3997Y 
Aircraft: Cessna 210
Injuries: 2 None
Flight Conducted Under: Part 91: General Aviation - Personal

On June 10, 2019, about 1245 Pacific daylight time, a Cessna 210D, N3997Y, experienced a total loss of engine power and collided with terrain short of the runway during an emergency landing to Ramona Airport, Ramona, California. The flight instructor and pilot-rated passenger were not injured; the airplane sustained substantial damage to the right wing. The airplane was registered to and operated by the flight instructor under the provisions of Title 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed and no flight plan had been filed. The personal local flight departed from Gillespie Field, San Diego, California, about 1200 and was diverting to Ramona, California.

The pilot stated that he was planning on practicing a series of instrument approaches. While inbound to the Julian VOR, with the airplane about 6,000 ft mean sea level (msl), the engine rpm increased to above 3,000 and in response, he retarded the propeller control to 2,400 rpm. He thought that erratic engine rpm was due to a propeller governor anomaly and communicated with the air traffic controller that he was terminating the practice approach. He stated his intention to return back to Gillespie Field and began the flight back. When about five miles south of Ramona, he felt the airplane shake and declared an emergency to the Ramona Air Traffic Control Tower.

The airplane was unable to maintain altitude and touched down in a field about 1/8 mile short of runway 27. During the touchdown, the airplane incurred damage to the right wing. An external examination revealed that engine oil coated the belly of the airplane and there were several holes in the crankcase.

The Continental Motors IO-520-FcA, serial number 240902-R, was an overhauled engine installed in June 2003 at an airplane total time of 1,119 hours and engine total time of 1,767.7 hours. At the time of the accident the tachometer read 2,747.88 hours (17.2 hours since last maintenance).

The engine was equipped with an F&M Enterprises Inc. engine oil filter adapter, model C6LC-L (s/n 10706L) under FAA Supplemental Type Certificate (STC) SE09356SC. An external examination revealed that the filter adapter was loose, and the adapter housing could be rotated about the shaft. The crown head of the shaft and the oil filter screen bolt head both remained saftied (see picture 01). There was a concentration of oil in the area of the adapter and adjacent firewall.

Picture 01: Oil Filter Adapter

A closer examination revealed that the fiber gasket, located between the oil pump casting and the adapter was protruding with the outside edge extending beyond the castings. Additionally, a tear could be seen in the gasket where the adapter housing abutted the engine case. Investigators removed the safety wire and attempted to assess the breakaway torque of the adapter. A torque wrench was used to determine that the breakaway torque was 9 foot-pounds (see picture 2).

Picture 02: Oil Filter Adapter Housing Loose

Removal of the adapter revealed that the fiber gasket was completely split and contained several lips where it appeared the gasket had been pinched between the engine case and the adapter housing (see picture 03). The copper crush gasket was intact.

Picture 03: Fiber Gasket

According to the owner, the installed oil filter adapter was likely originally installed on the then newly-overhauled engine in June 2003. There were no documents regarding the installation of the adapter, but there were mentions of the adapter throughout the partial logbook entries. The mechanic that performed the last maintenance stated that when he performed the annual inspection on May 03, 2019 he replaced the copper crush gasket and retorqued the filter adapter; he did not replace the fiber gasket.

The adapter and gaskets were sent to the NTSB materials laboratory for further investigation.

Aircraft and Owner/Operator Information

Aircraft Make: Cessna
Registration: N3997Y
Model/Series: 210 D
Aircraft Category: Airplane
Amateur Built: No
Operator: On file
Operating Certificate(s) Held: None

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Day
Observation Facility, Elevation: KRNM, 1393 ft msl
Observation Time: 1200 PDT
Distance from Accident Site: 1 Nautical Miles
Temperature/Dew Point: 37°C / 12°C
Lowest Cloud Condition: Clear
Wind Speed/Gusts, Direction: 9 knots / , 320°
Lowest Ceiling: None
Visibility:  10 Miles
Altimeter Setting: 30.02 inches Hg
Type of Flight Plan Filed: None
Departure Point: San Diego/El Cajon, CA (SEE)
Destination: San Diego/El Cajon, CA (SEE)

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: 1 None
Aircraft Fire: None
Ground Injuries:N/A 
Aircraft Explosion: None
Total Injuries: 2 None
Latitude, Longitude:  33.030000, -116.910000 (est)

RAMONA, California — Two people escaped injury Monday afternoon when the light plane they were flying in crashed while approaching the Ramona airport, authorities said.

The pilot of the Cessna 210D Centurion radioed an emergency due to engine failure before the airplane went down on the outskirts of Ramona Airport about 12:45 p.m., according to the Federal Aviation Administration.

Medics checked out the pilot and passenger and determined they were uninjured, Cal Fire reported.

In a tweet just after 1 p.m., the agency said everyone had gotten out of the plane, and there was no report of fire.

The Cessna 210D Centurion, which had departed from Gillespie Field in El Cajon, is registered to a resident of that East County city, according to FAA records.

Original article ➤

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