Wednesday, June 30, 2021

Flight Control System Malfunction / Failure: Ayres SR2-T34 Thrush, N4032; accident occurred June 27, 2020 in Perry, Houston County, Georgia

Aviation Accident Final Report - National Transportation Safety Board

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; College Park, Georgia

Investigation Docket - National Transportation Safety Board:

Houston Crop Service Inc

Location: Perry, Georgia
Accident Number: ERA20CA232
Date & Time: June 27, 2020, 18:00 Local 
Registration: N4032L
Aircraft: Ayres S2R 
Aircraft Damage: Substantial
Defining Event: Flight control sys malf/fail
Injuries: 1 None
Flight Conducted Under: Part 137: Agricultural


The pilot stated that he performed a preflight inspection of the airplane and observed no discrepancies. While taxiing for takeoff he performed a check of the flight controls, adding there were no discrepancies and the gust lock was free. He initiated takeoff, and when the flight was 20 ft above the runway, he noted the airplane was right wing low. He applied left aileron control input but noted the control did not move. He then also applied right aileron control input, but it wouldn’t move to the right either. He aborted the takeoff and thought about dumping the load of chemical but did not. The airplane touched down on the grass portion of his runway and bounced three times. On the third bounce he reported both main landing gear collapsed. The airplane slid into the nearby field and came to rest upright. Postaccident examination of the airplane revealed substantial damage to both wings and the bottom of the fuselage. Examination of the flight control system was unable to identify any obstructions or other issues.

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The reported malfunction of the aileron flight control system during takeoff for reasons that could not be determined.


Aircraft Aileron control system - Unknown/Not determined

Factual Information

History of Flight

Takeoff Flight control sys malf/fail (Defining event)
Takeoff-rejected takeoff Miscellaneous/other
Landing-flare/touchdown Landing gear collapse
Landing-flare/touchdown Abnormal runway contact

Pilot Information

Certificate: Commercial
Age: 73,Male
Airplane Rating(s): Single-engine land; Multi-engine land
Seat Occupied: Center
Other Aircraft Rating(s): None
Restraint Used: 4-point
Instrument Rating(s): Airplane
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Class 2 With waivers/limitations
Last FAA Medical Exam: March 5, 2020
Occupational Pilot: Yes 
Last Flight Review or Equivalent: April 1, 2019
Flight Time: (Estimated) 25000 hours (Total, all aircraft), 20000 hours (Total, this make and model)

Aircraft and Owner/Operator Information

Aircraft Make: Ayres
Registration: N4032L
Model/Series: S2R T34 
Aircraft Category: Airplane
Year of Manufacture: 1999
Amateur Built: No
Airworthiness Certificate: Restricted (Special) 
Serial Number: T34-264
Landing Gear Type: Tailwheel 
Seats: 1
Date/Type of Last Inspection: March 20, 2020 Annual 
Certified Max Gross Wt.: 6000 lbs
Time Since Last Inspection: 130 Hrs
Engines: 1 Turbo prop
Airframe Total Time: 9709.9 Hrs at time of accident
Engine Manufacturer: Pratt & Whitney
ELT: Not installed
Engine Model/Series: PT6A-34AG
Registered Owner: 
Rated Power: 750 Horsepower
Operator: On file
Operating Certificate(s) Held: Agricultural aircraft (137)
Operator Does Business As: Operator Designator Code: FWPG

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual (VMC) 
Condition of Light: Day
Observation Facility, Elevation: WRB,294 ft msl 
Distance from Accident Site: 10 Nautical Miles
Observation Time: 17:56 Local 
Direction from Accident Site: 38°
Lowest Cloud Condition: Clear
Visibility: 10 miles
Lowest Ceiling: None
Visibility (RVR):
Wind Speed/Gusts: 10 knots /
Turbulence Type Forecast/Actual: None / None
Wind Direction: 300° 
Turbulence Severity Forecast/Actual: N/A / N/A
Altimeter Setting: 30.03 inches Hg
Temperature/Dew Point: 31°C / 23°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Perry, GA 
Type of Flight Plan Filed:
Destination: Perry, GA 
Type of Clearance: None
Departure Time:
Type of Airspace:

Airport Information

Airport: Private None 
Runway Surface Type: Asphalt; Grass/turf
Airport Elevation: 384 ft msl
Runway Surface Condition: Dry
Runway Used: 17 IFR 
Approach: None
Runway Length/Width: 2845 ft / 20 ft 
VFR Approach/Landing: Forced landing

Wreckage and Impact Information

Crew Injuries: 1 None 
Aircraft Damage: Substantial
Passenger Injuries:
Aircraft Fire: None
Ground Injuries: 
Aircraft Explosion: None
Total Injuries: 1 None
Latitude, Longitude: 32.432197,-83.790921(est)

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