Mt. Vernon Airport
Aircraft Accident/Incident Report

Mt. Vernon, Illinois 62864
Sunday, August 29, 1999 11:45 CDT

NTSB Narrative Summary Released at Completion of Accident

The pilot reported that while landing on runway 23 a quartering crosswind from the left lifted the tail of the airplane to the right. The airplane rotated 360 degrees and the right main landing gear collapsed. The pilot reported local winds at the time of the accident were from 150 degrees at 15 knots gusting to 18 knots.

NTSB Probable Cause Narrative

the pilot's inadequate compensation for the wind condition which resulted in an inadvertent ground loop. A factor associated with the accident was the gusty crosswind.

Event Information

Type of Event Accident
Event Date 8/29/1999
Event Day of the Week Sunday
Time of Event 1145
Event Time Zone Central Daylight Time
Event City MT. VERNON
Event State ILLINOIS
Event Country --
Zipcode of the event site 62864
Event Date Year 1999
Event Date Month 8
MidAir Collision Indicator No
On Ground Collision occurred ? No
Event Location Latitude
Event Location Longitude
Event Location Airport MT. VERNON
Event Location Nearest Airport ID MVN
Indicates whether the acc/inc occurred off or on an airport On Airport
Distance from airport in statute miles --
Degrees magnetic from airport --
Airport Elevation 480
Weather Briefing Completeness Unknown
Investigator's weather source Pilot
Time of the weather observation 0
Direction of event from weather observation facility (degrees) 0
Weather Observation Facility ID
Elevation of weather observation facility 0
Distance of event from weather observation facility (units?) 0
Time Zone of the weather observation
Lighting Conditions Day
Lowest Ceiling Height 0
Lowest Non-Ceiling Height 0
Sky/Lowest/Cloud Conditions Clear
Sky Condition for Lowest Ceiling None
Visibility Runway Visual Range (Feet) 0
Visibility Runway Visual Value (Statute Miles) 0
Visibility (Statute Miles) 10
Air Temperature at event time (in degrees celsius) 27
Dew Point at event time (in degress fahrenheit) 14
Wind Direction (degrees magnetic) 150
Variable Wind Indicator Unknown
Wind Speed (knots) 15
Wind Velocity Indicator Unknown
Wind Gust Indicator Unknown
Wind Gust (knots) 18
Altimeter Setting at event time (in. Hg) --
Density Altitude (feet) --
Intensity of Precipitation Unknown
METAR weather report --
Event Highest Injury None
On Ground, Fatal Injuries 0
On Ground, Minor Injuries 0
On Ground, Serious Injuries 0
Injury Total Fatal --
Injury Total Minor --
Injury Total None 2
Injury Total Serious --
Injury Total All --
Investigating Agency NTSB
NTSB Docket Number (internal use) 772
NTSB Notification Source --
NTSB Notification Date Sep 10 1999 12:00AM
NTSB Notification Time 1327
Fiche Number and/or location -used to find docket information IMAGE
Date of most recent change to record Dec 12 2000 11:49AM
User who most recently changed record dbo
Basic weather conditions Visual Meteorological Cond
FAA District Office --

Aircraft Involved

Aircraft #1

Aircraft Registration Number N60SV
NTSB Number CHI99LA335
Missing Aircraft Indicator N
Federal Aviation Reg. Part Part 91: General Aviation
Type of Flight Plan filed None
Flight plan Was Activated? --
Damage Substantial
Aircraft Fire None
Aircraft Explosion None
Aircraft Manufacturer's Full Name BENSON
Aircraft Model SORRELL SNS-7
Aircraft Series Identifier SORRELL SN
Aircraft Serial Number 236
Certified Max Gross Weight 1810
Aircraft Category Airplane
Aircraft Registration Class U.S. Registered/U.S. Soil
Aircraft is a homebuilt? Yes
Flight Crew Seats --
Cabin Crew Seats --
Passenger Seats --
Total number of seats on the aircraft 2
Number of Engines 1
Fixed gear or retractable gear Fixed
Aircraft, Type of Last Inspection Annual
Date of Last Inspection Mar 29 1999 12:00AM
Airframe hours since last inspection 18
Airframe Hours 381
ELT Installed Yes
ELT Activated No
ELT Aided Location of Event Site Unknown
ELT Type --
Aircraft Owner Name VERNON A. WALSER
Aircraft Owner Street Address 4864 OLDENBURG AVE.
Aircraft Owner City ST. LOUIS
Aircraft Owner State MO
Aircraft Owner Country
Aircraft Owner Zipcode 63123
Operator is an individual? --
Operator Name
Operator Same as Owner? Yes
Operator Is Doing Business As --
Operator Address Same as Owner? Yes
Operator Street Address
Operator City
Operator State
Operator Country
Operator Zip code
Operator Code
Owner has at least one certificate None
Other Operator of large aircraft? No
Certified for Part 133 or 137 Operation Unknown
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) Personal
Second Pilot on Board No
Departure Point Same as Event No
Departure Airport Code 1H0
Departure City CREVE COUER
Departure State MO
Departure Country
Departure Time 1015
Departure Time Zone CDT
Destination Same as Local Flt crash at destination city
Destination Airport Code MVN
Destination City
Destination State
Destination Country
Specific Phase of Flight Landing
Report sent to ICAO? --
Evacuation occurred --
Date of most recent change to record Jan 2 2001 10:35AM
User who most recently changed record dbo
Since inspection or accident --
Event Location Runway Number and Location 23
Runway Length 6498
Runway Width 150
Sight Seeing flight No
Air Medical Flight No
Medical Flight --