Airplane at Accident Site.
Hole Adjacent to Number 4 Cylinder.
Removed Engine Prior to Examination.
Vacuum Pump Gasket as Discovered.
(Red Arrow Indicates Exposed Oil Orifice).
The National Transportation Safety Board did not travel to the scene of this accident.
Additional Participating Entities:
Federal Aviation Administration / Flight Standards District Office; Oklahoma City, Oklahoma
Continental Engines; Mobile, Alabama
Aviation Accident Factual Report - National Transportation Safety Board: https://app.ntsb.gov/pdf
Investigation Docket - National Transportation Safety Board: https://dms.ntsb.gov/pubdms
http://registry.faa.gov/aN6257V
Location: Walters, OK
Accident Number: CEN17LA286
Date & Time: 07/08/2017, 1050 CDT
Registration: N6257V
Aircraft: BEECH V35
Aircraft Damage: Substantial
Defining Event: Loss of engine power (total)
Injuries: 2 Minor
Flight Conducted Under: Part 91: General Aviation - Personal
On July 8, 2017, about 1050 central daylight time, a Beech V35 airplane sustained substantial damage during a forced landing after a loss of engine power near Walters, Oklahoma. The airline transport pilot and one passenger sustained minor injuries. Visual meteorological conditions prevailed and no flight plan was filed. The airplane was registered to Gas Corporation of America of Wichita Falls, Texas, and the flight was being operated by the pilot under the provisions of Title 14 Code of Federal Regulations Part 91. The flight originated at 1040 from Kickapoo Downtown Airport (CWC), Wichita, Falls, Texas, and was en route to Lawton, Oklahoma.
The pilot reported that about 10 minutes after departing CWC, the oil pressure went to zero and the engine failed. He executed a forced landing to a soft farm field, about one mile south of the Walters Airport (OK12). The pilot and passenger exited the airplane with minor injuries. The airplane sustained substantial damage to the firewall and lower fuselage.
A review of the airplane maintenance records showed that the vacuum pump was replaced on July 7, 2017, the day before the accident. The engine was visually examined and disassembled. During the disassembly, it was discovered that a improper gasket (P/N-21051) was installed on the vacuum pump. The gasket was normally used for the installation of a carburetor. The installed gasket did not completely cover the high-pressure oil orifice on the vacuum pump mounting fixture. The proper gasket was (PN-MS9134-01) for the vacuum pump. Three connecting rods showed thermal and impact damage, and three rod journals were observed to be dry and showed thermal discoloration.
Pilot Information
Certificate: Airline Transport
Age: 48, Male
Airplane Rating(s): Multi-engine Land; Single-engine Sea
Seat Occupied: Left
Other Aircraft Rating(s): None
Restraint Used:
Instrument Rating(s): Airplane
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Class 1 Without Waivers/Limitations
Last FAA Medical Exam: 06/14/2016
Occupational Pilot: No
Last Flight Review or Equivalent:
Flight Time: (Estimated) 5000 hours (Total, all aircraft), 26 hours (Total, this make and model), 20 hours (Last 90 days, all aircraft), 1 hours (Last 24 hours, all aircraft)
Aircraft and Owner/Operator Information
Aircraft Make: BEECH
Registration: N6257V
Model/Series: V35 UNDESIGNATED
Aircraft Category: Airplane
Year of Manufacture: 1967
Amateur Built: No
Airworthiness Certificate:Normal
Serial Number: D-8587
Landing Gear Type: Retractable - Tricycle
Seats: 6
Date/Type of Last Inspection: 02/07/2017, Annual
Certified Max Gross Wt.: 3400 lbs
Time Since Last Inspection: 10 Hours
Engines: Reciprocating
Airframe Total Time: 3432 Hours at time of accident
Engine Manufacturer: Continental
ELT: C91A installed, not activated
Engine Model/Series: IO-520-BB6
Registered Owner: On file
Rated Power: 300 hp
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: LAW
Distance from Accident Site: 20 Nautical Miles
Observation Time: 1053 CDT
Direction from Accident Site: 180°
Lowest Cloud Condition: Clear
Visibility: 10 Miles
Lowest Ceiling: None
Visibility (RVR):
Wind Speed/Gusts: 3 knots /
Turbulence Type Forecast/Actual:
Wind Direction: 130°
Turbulence Severity Forecast/Actual:
Altimeter Setting: 30.07 inches Hg
Temperature/Dew Point: 25°C / 22°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Wichita Falls, TX (CWC)
Type of Flight Plan Filed: None
Destination: Lawton, OK (LAW)
Type of Clearance: None
Departure Time: 1040 CDT
Type of Airspace: Class E
Airport Information
Airport: Jones Farm Field Airport (OK12)
Runway Surface Type:
Airport Elevation: 1042 ft
Runway Surface Condition: Dry
Runway Used: N/A
IFR Approach: None
Runway Length/Width:
VFR Approach/Landing: Forced Landing
Wreckage and Impact Information
Crew Injuries: 1 Minor
Aircraft Damage: Substantial
Passenger Injuries: 1 Minor
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 2 Minor
Latitude, Longitude: 34.399167, -98.266389 (est)
NTSB Identification: CEN17LA286
14 CFR Part 91: General Aviation
Accident occurred Saturday, July 08, 2017 in Walters, OK
Aircraft: BEECH V35, registration: N6257V
Injuries: 2 Minor.
This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
On July 8, 2017, about 1050 central daylight time, a Beech Bonanza V35, N6257V, registered to Gas Corporation of America of Wichita Falls, Texas, sustained substantial damage following a forced landing after a loss of engine power in the vicinity of Walters, Oklahoma. The airline transport rated pilot and one passenger sustained minor injuries. Visual meteorological conditions prevailed and no flight plan was filed. The flight was being operated under the provisions of Federal Code of Regulations Part 91. The flight originated at 1040 from Kickapoo Downtown Airport (CWC), Wichita, Falls, Texas, and was enroute to Lawton, Oklahoma.
The pilot reported that about 10 minutes after departing CWC, the oil pressure went to zero and the engine failed. He executed a forced landing to a farm field, about 1-mile south of the Walters Airport (OK12). The pilot and passenger exited the airplane with minor injuries. The airplane sustained substantial damage to the firewall and lower fuselage.
Inspection of the airplane after the accident revealed a hole above the #4 cylinder. Review of the aircraft logbooks showed that all engine cylinders were replaced about 10 flight hours prior to the accident flight. The airplane and engine have been transported to a local facility for further inspection.
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