Tuesday, June 18, 2019

Aerodynamic Stall / Spin: Beech A36 Bonanza, N710JT, accident occurred June 06, 2018 at Gilliam Airport (LA54), Caddo Parish, Louisiana

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Baton Rouge, Louisiana

Aviation Accident Final Report - National Transportation Safety Board:  https://app.ntsb.gov/pdf


Investigation Docket - National Transportation Safety Board:  https://dms.ntsb.gov/pubdms


Aviation Accident Data Summary - National Transportation Safety Board:  https://app.ntsb.gov/pdf


http://registry.faa.gov/N710JT

Location: Gilliam, LA

Accident Number: GAA18CA335
Date & Time: 06/06/2018, 0910 CDT
Registration: N710JT
Aircraft: BEECH A36
Aircraft Damage: Substantial
Defining Event: Aerodynamic stall/spin
Injuries: 4 None
Flight Conducted Under: Part 91: General Aviation - Personal

Analysis 

The pilot reported that, during a soft-field takeoff from a private grass airstrip, he applied slight aft pressure to the yoke to lighten the load on the nosewheel. The airplane became airborne, but while in ground effect, the left wing dropped about 10º, and the left main landing gear contacted the runway. The airplane settled back on the ground pointing about 30º left of the runway heading. The airplane then departed the runway to the left and ground looped, during which the left landing gear collapsed. The airplane slid backward and came to rest upright on the field adjacent the airstrip.

The airplane sustained substantial damage to both ailerons.

The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.

The pilot added that the airplane's weight and balance were within the operational limitations in the Pilot's Operating Handbook.

The automated weather observation system located on an airport 18 nautical miles (nm) south of the accident site reported that, about 17 minutes before the accident, the wind was from 90º at 5 knots. An automated weather observation station located on an airport 22 nm southeast of the accident site reported that, about 14 minutes before the accident, the wind was from 110º at 3 knots. The airplane departed from runway 26.

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The pilot's exceedance of the airplane's critical angle of attack during a soft-field takeoff, which resulted in an aerodynamic stall.

Findings

Aircraft
Angle of attack - Not attained/maintained (Cause)

Personnel issues
Aircraft control - Pilot (Cause)

Factual Information

History of Flight

Takeoff
Aerodynamic stall/spin (Defining event)
Loss of control on ground
Runway excursion 

Pilot Information

Certificate: Airline Transport; Flight Instructor
Age: 72, Male
Airplane Rating(s): Multi-engine Land; Single-engine Land
Seat Occupied: Left
Other Aircraft Rating(s): None
Restraint Used: 3-point
Instrument Rating(s): Airplane
Second Pilot Present: No
Instructor Rating(s): Airplane Multi-engine; Airplane Single-engine
Toxicology Performed: No
Medical Certification: Class 2 With Waivers/Limitations
Last FAA Medical Exam: 02/16/2018
Occupational Pilot: Yes
Last Flight Review or Equivalent: 10/19/2016
Flight Time:  (Estimated) 18250 hours (Total, all aircraft), 48 hours (Total, this make and model), 14000 hours (Pilot In Command, all aircraft), 87 hours (Last 90 days, all aircraft), 52 hours (Last 30 days, all aircraft), 2 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: BEECH
Registration: N710JT
Model/Series: A36
Aircraft Category: Airplane
Year of Manufacture: 1975
Amateur Built: No
Airworthiness Certificate: Normal; Utility
Serial Number: E-665
Landing Gear Type: Retractable - Tricycle
Seats: 6
Date/Type of Last Inspection:
Certified Max Gross Wt.: 3651 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time:
Engine Manufacturer: Lycoming
ELT:
Engine Model/Series: IO 520
Registered Owner: On file
Rated Power:
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: KDTN, 179 ft msl
Distance from Accident Site: 18 Nautical Miles
Observation Time: 1353 UTC
Direction from Accident Site: 165°
Lowest Cloud Condition: Clear
Visibility:  6 Miles
Lowest Ceiling: None
Visibility (RVR):
Wind Speed/Gusts: 5 knots /
Turbulence Type Forecast/Actual: None / None
Wind Direction: 90°
Turbulence Severity Forecast/Actual: N/A / N/A
Altimeter Setting: 29.93 inches Hg
Temperature/Dew Point: 24°C / 22°C
Precipitation and Obscuration: Moderate - Mist; No Obscuration; No Precipitation
Departure Point: Gilliam, LA (LA54)
Type of Flight Plan Filed: None
Destination: Gilliam, LA (LA54)
Type of Clearance: VFR
Departure Time:  CDT
Type of Airspace: Class G

Airport Information

Airport: GILLIAM (LA54)
Runway Surface Type: Grass/turf
Airport Elevation: 194 ft
Runway Surface Condition: Dry; Rough
Runway Used: 26
IFR Approach:None 
Runway Length/Width: 3100 ft / 75 ft
VFR Approach/Landing: 

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: 3 None
Aircraft Fire: None
Ground Injuries:N/A 
Aircraft Explosion: None
Total Injuries: 4 None
Latitude, Longitude: 32.837778, -93.837778 (est)

1 comment:

Dunning–Kruger effect said...

Almost every single day some grandpa bends a high performance single for no good reason. Sorry but abilities degrade with age. Maybe you'll feel fit to fly well past 70 but perhaps we shouldn't rely on feelings. Maybe CFIs need to pay special attention to BFRs with folks past a certain age.