Aircraft Accident/Incident Report

Buttonwillow, California 93206
Thursday, February 12, 2009 8:15 PST

NTSB Narrative Summary Released at Completion of Accident

While en route to an agriculture application job, the airplane's engine exhaust started shaking, then smoke started coming off the engine. The pilot landed on a farm road. During the landing his visibility was limited by the smoke, and the right wheel went off the road into soft mud. The airplane swerved to the right and nosed over. Examination of the engine disclosed that the number four cylinder base nuts had backed off, allowing the cylinder to separate from the engine case.

NTSB Probable Cause Narrative

A loss of engine power due to the number four cylinder base nuts becoming loose, allowing the cylinder to detach from the engine case. Contributing to the accident was the pilot's impaired visibility due to smoke during the forced landing.

Event Information

Type of Event Accident
Event Date 2/12/2009
Event Day of the Week Thursday
Time of Event 815
Event Time Zone Pacific Standard Time
Event City Buttonwillow
Event State CALIFORNIA
Event Country --
Zipcode of the event site 93206
Event Date Year 2009
Event Date Month 2
MidAir Collision Indicator No
On Ground Collision occurred ? No
Event Location Latitude 352357N
Event Location Longitude 1192827W
Event Location Airport --
Event Location Nearest Airport ID --
Indicates whether the acc/inc occurred off or on an airport Off Airport/Airstrip
Distance from airport in statute miles --
Degrees magnetic from airport --
Airport Elevation --
Weather Briefing Completeness --
Investigator's weather source Weather Observation Facility
Time of the weather observation 854 Pacific Standard Time
Direction of event from weather observation facility (degrees) 270
Weather Observation Facility ID KBFL
Elevation of weather observation facility --
Distance of event from weather observation facility (units?) 22
Time Zone of the weather observation PST
Lighting Conditions Day
Lowest Ceiling Height --
Lowest Non-Ceiling Height --
Sky/Lowest/Cloud Conditions Clear
Sky Condition for Lowest Ceiling None
Visibility Runway Visual Range (Feet) --
Visibility Runway Visual Value (Statute Miles) --
Visibility (Statute Miles) 7
Air Temperature at event time (in degrees celsius) 6
Dew Point at event time (in degress fahrenheit) 3
Wind Direction (degrees magnetic) --
Variable Wind Indicator --
Wind Speed (knots) --
Wind Velocity Indicator Calm
Wind Gust Indicator Not Gusting
Wind Gust (knots) --
Altimeter Setting at event time (in. Hg) 30.16
Density Altitude (feet) --
Intensity of Precipitation --
METAR weather report --
Event Highest Injury None
On Ground, Fatal Injuries --
On Ground, Minor Injuries --
On Ground, Serious Injuries --
Injury Total Fatal --
Injury Total Minor --
Injury Total None 1
Injury Total Serious --
Injury Total All --
Investigating Agency NTSB
NTSB Docket Number (internal use) 25156
NTSB Notification Source FAA Operations Center
NTSB Notification Date --
NTSB Notification Time --
Fiche Number and/or location -used to find docket information --
Date of most recent change to record Mar 4 2009 3:11PM
User who most recently changed record coos
Basic weather conditions Visual Meteorological Cond
FAA District Office --

Aircraft Involved

Aircraft #1

Aircraft Registration Number N3626T
NTSB Number WPR09CA114
Missing Aircraft Indicator --
Federal Aviation Reg. Part Part 137: Agricultural
Type of Flight Plan filed None
Flight plan Was Activated? --
Damage Substantial
Aircraft Fire None
Aircraft Explosion None
Aircraft Manufacturer's Full Name SCHWEIZER
Aircraft Model G-164B
Aircraft Series Identifier --
Aircraft Serial Number 722B
Certified Max Gross Weight 5704
Aircraft Category Airplane
Aircraft Registration Class --
Aircraft is a homebuilt? No
Flight Crew Seats 1
Cabin Crew Seats --
Passenger Seats --
Total number of seats on the aircraft 1
Number of Engines 1
Fixed gear or retractable gear Fixed
Aircraft, Type of Last Inspection Annual
Date of Last Inspection Sep 14 2008 12:00AM
Airframe hours since last inspection --
Airframe Hours 9290
ELT Installed No
ELT Activated No
ELT Aided Location of Event Site No
ELT Type --
Aircraft Owner Name Vince Crop Dusters, Inc.
Aircraft Owner Street Address --
Aircraft Owner City Buttonwillow
Aircraft Owner State CA
Aircraft Owner Country USA
Aircraft Owner Zipcode 93206
Operator is an individual? No
Operator Name Vince Crop Dusters, Inc.
Operator Same as Owner? Yes
Operator Is Doing Business As --
Operator Address Same as Owner? Yes
Operator Street Address --
Operator City Buttonwillow
Operator State CA
Operator Country USA
Operator Zip code 93206
Operator Code --
Owner has at least one certificate None
Other Operator of large aircraft? No
Certified for Part 133 or 137 Operation Agriculture
Operator Certificate Number --
Indicates whether an air carrier operation was scheduled or not --
Indicates Domestic or International Flight --
Operator carrying Pax/Cargo/Mail --
Type of Flying (Per_Bus / Primary) Aerial Application
Second Pilot on Board No
Departure Point Same as Event Yes
Departure Airport Code --
Departure City Buttonwillow
Departure State CA
Departure Country USA
Departure Time --
Departure Time Zone PST
Destination Same as Local Flt dest & departure same, accident can occur anywhere
Destination Airport Code --
Destination City Buttonwillow
Destination State CA
Destination Country USA
Specific Phase of Flight --
Report sent to ICAO? --
Evacuation occurred --
Date of most recent change to record Mar 4 2009 3:11PM
User who most recently changed record coos
Since inspection or accident Last Inspection
Event Location Runway Number and Location N/A
Runway Length --
Runway Width --
Sight Seeing flight No
Air Medical Flight No
Medical Flight --