Monday, February 03, 2020

Loss of Control in Flight: Socata TBM700N (TBM850), N850NK; accident occurred October 14, 2019 at Stephens County Airport (KBKD), Breckenridge, Texas

Aviation Accident Final Report - National Transportation Safety Board 

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Lubbock, Texas

Investigation Docket - National Transportation Safety Board:

Mt Margarett LLC

Location: Breckenridge, TX
Accident Number: GAA20CA013
Date & Time: 10/14/2019, 1245 CDT
Registration: N850NK
Aircraft: SOCATA TBM700
Aircraft Damage: Substantial
Defining Event: Loss of control in flight
Injuries: 2 None
Flight Conducted Under: Part 91: General Aviation - Personal


The pilot reported that, during the approach and while the airplane was about 500 ft above ground level and 81 knots, he "felt the descent rate increase significantly." The pilot increased engine power, but "the high rate of descent continued," and he then increased the engine power further. A slow left roll developed, and he applied full right aileron and full right rudder to arrest the left roll. He also reduced the engine power, and the left roll stopped. The pilot regained control of the airplane, but the airplane's heading was 45° left of the runway heading, and the airplane impacted trees and then terrain. The airplane caught fire, and the pilot and passenger exited through the emergency exit. The airplane sustained substantial damage to the windscreens and fuselage. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The pilot's failure to maintain bank control and adequate altitude during the approach, which resulted in his failure to maintain the runway heading and a subsequent collision with trees and terrain.


Lateral/bank control - Not attained/maintained (Cause)
Altitude - Not attained/maintained (Cause)

Personnel issues
Aircraft control - Pilot (Cause)

Environmental issues
Tree(s) - Effect on operation (Cause)

Factual Information

History of Flight

Loss of control in flight (Defining event)
Collision with terr/obj (non-CFIT)

Pilot Information

Certificate: Airline Transport; Commercial
Age: 58, Male
Airplane Rating(s): Multi-engine Land; Single-engine Land
Seat Occupied: Left
Other Aircraft Rating(s): Helicopter
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: 07/18/2019
Occupational Pilot: Yes
Last Flight Review or Equivalent: 06/25/2019
Flight Time: (Estimated) 8195 hours (Total, all aircraft), 6 hours (Total, this make and model), 5764 hours (Pilot In Command, all aircraft), 81 hours (Last 90 days, all aircraft), 46 hours (Last 30 days, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: SOCATA
Model/Series: TBM700
Aircraft Category: Airplane
Year of Manufacture: 2007
Amateur Built: No
Airworthiness Certificate: Normal
Serial Number: 432
Landing Gear Type: Retractable - Tricycle
Seats: 6
Date/Type of Last Inspection: 06/25/2019, Annual
Certified Max Gross Wt.: 6751 lbs
Time Since Last Inspection:
Engines: 1 Turbo Prop
Airframe Total Time: 2878 Hours at time of accident
Engine Manufacturer: Pratt & Whitney
ELT:  C126 installed, activated, did not aid in locating accident
Engine Model/Series: PT6A66D
Registered Owner: Mt Margarett LLC
Rated Power: 850 hp
Operator: Mt Margarett LLC
Operating Certificate(s) Held: On-demand Air Taxi (135) 

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Day
Observation Facility, Elevation: KBKD, 1283 ft msl
Distance from Accident Site: 0 Nautical Miles
Observation Time: 1755 UTC
Direction from Accident Site: 188°
Lowest Cloud Condition: Scattered / 12000 ft agl
Visibility:  5 Miles
Lowest Ceiling:
Visibility (RVR):
Wind Speed/Gusts: Calm /
Turbulence Type Forecast/Actual:
Wind Direction:
Turbulence Severity Forecast/Actual:
Altimeter Setting: 29.97 inches Hg
Temperature/Dew Point: 25°C / 12°C
Precipitation and Obscuration: Moderate - Haze
Departure Point: San Angelo, TX (SJT)
Type of Flight Plan Filed: IFR
Destination: Breckenridge, TX (BKD)
Type of Clearance: IFR; VFR
Departure Time: 1210 CDT
Type of Airspace: Class G

Airport Information

Airport: Stephens County (BKD)
Runway Surface Type: Asphalt
Airport Elevation: 1284 ft
Runway Surface Condition: Dry; Vegetation
Runway Used: 17
IFR Approach: None
Runway Length/Width: 4997 ft / 100 ft
VFR Approach/Landing: Forced Landing; Straight-in

Wreckage and Impact Information

Crew Injuries:1 None 
Aircraft Damage: Substantial
Passenger Injuries: 1 None
Aircraft Fire: On-Ground
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 2 None
Latitude, Longitude:  32.718889, -98.891667 (est)


  1. Odd situation to have an experienced pilot fly a perfectly good airplane into the ground in good weather ... glad he wasn't hurt.

    1. 6 Hours total Make and Model. 81 knot approach speed.

      Sounds like the start of a torque roll when he added 850 shp. Most likely his 8,200 hours kicked in and he reduced power or this would have had a sad ending for 2 people.