Wednesday, June 16, 2021

System / Component Malfunction / Failure (Non-Power): Great Lakes 2T-1A-1 Sport Trainer, N503GL; accident occurred June 14, 2021 at Northwest Regional Airport (52F), Roanoke, Denton County, Texas

Aviation Accident Final Report - National Transportation Safety Board 

The National Transportation Safety Board did not travel to the scene of this accident.

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

Investigation Docket - National Transportation Safety Board:
Location: Roanoke, Texas
Accident Number: CEN21LA267
Date and Time: June 14, 2021, 08:30 Local
Registration: N503GL
Aircraft: Great Lakes 2T-1A-1 
Aircraft Damage: Substantial
Defining Event: Sys/Comp malf/fail (non-power)
Injuries: 2 Minor
Flight Conducted Under: Part 91: General aviation - Personal


The pilot reported that when he applied “light even braking” during the landing roll, the airplane abruptly veered left. He added full right rudder and brake, but the airplane continued to the left and exited the runway surface. The airplane sunk into the soft dirt, nosed over, and came to rest inverted. The airplane sustained substantial damage to the upper wing and rudder. The pilot further reported that the brakes had been replaced during the last annual inspection which occurred about 1 hour before the accident. An on scene examination of the brake system revealed that the left wheel would not rotate. The brake caliper was disassembled; the caliper pins exhibited brake dust and brake fluid residue which is not consistent with new brakes. Therefore, it is likely the caliper was stuck closed during landing due to the brake dust and brake fluid reside on the caliper pins.

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
Inadequate maintenance of the brake system which resulted in the caliper binding closed and the subsequent loss of directional control during the landing roll. 


Aircraft Braking capability - Malfunction
Aircraft Directional control - Attain/maintain not possible
Aircraft Brake - Incorrect service/maintenance

Factual Information

History of Flight

Prior to flight Aircraft maintenance event
Landing-landing roll Sys/Comp malf/fail (non-power) (Defining event)
Landing-landing roll Loss of control on ground
Landing-landing roll Runway excursion
Landing-landing roll Nose over/nose down

Pilot Information

Certificate: Airline transport; Commercial
Age: 59, Male
Airplane Rating(s): Single-engine land; Multi-engine land
Seat Occupied: Rear
Other Aircraft Rating(s): None 
Restraint Used: 4-point
Instrument Rating(s): Airplane
Second Pilot Present:
Instructor Rating(s): Airplane multi-engine; Airplane single-engine
Toxicology Performed:
Medical Certification: Class 1 With waivers/limitations 
Last FAA Medical Exam: December 2, 2020
Occupational Pilot: Yes 
Last Flight Review or Equivalent: January 23, 2021
Flight Time: 21200 hours (Total, all aircraft), 75 hours (Total, this make and model), 11591 hours (Pilot In Command, all aircraft), 81 hours (Last 90 days, all aircraft), 67 hours (Last 30 days, all aircraft), 1 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: Great Lakes
Registration: N503GL
Model/Series: 2T-1A-1
Aircraft Category: Airplane
Year of Manufacture: 1973 
Amateur Built:
Airworthiness Certificate: Aerobatic 
Serial Number: 0503
Landing Gear Type: Tailwheel
Seats: 2
Date/Type of Last Inspection: April 6, 2021 Annual 
Certified Max Gross Wt.: 1750 lbs
Time Since Last Inspection: 1 Hrs
Engines: 1 Reciprocating
Airframe Total Time: 1181 Hrs at time of accident 
Engine Manufacturer: Lycoming
ELT: C91 installed, not activated
Engine Model/Series: O-320-EZA
Registered Owner: 
Rated Power: 150
Operator: On file
Operating Certificate(s) Held: None

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual (VMC)
Condition of Light: Day
Observation Facility, Elevation: AFW,723 ft msl 
Distance from Accident Site: 7 Nautical Miles
Observation Time: 08:53 Local
Direction from Accident Site: 230°
Lowest Cloud Condition: Few / 18000 ft AGL 
Visibility 10 miles
Lowest Ceiling: None 
Visibility (RVR):
Wind Speed/Gusts: 5 knots / 
Turbulence Type Forecast/Actual: None / None
Wind Direction: 60° 
Turbulence Severity Forecast/Actual: N/A / N/A
Altimeter Setting: 29.99 inches Hg
Temperature/Dew Point: 29°C / 24°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Roanoke, TX
Type of Flight Plan Filed: None
Destination: Roanoke, TX 
Type of Clearance: VFR
Departure Time:
Type of Airspace: Unknown

Airport Information

Airport: Northwest Regional Airport 52F 
Runway Surface Type: Asphalt
Airport Elevation: 643 ft msl 
Runway Surface Condition: Dry
Runway Used: 17 
IFR Approach: None
Runway Length/Width: 3500 ft / 40 ft 
VFR Approach/Landing: Full stop

Wreckage and Impact Information

Crew Injuries: 1 Minor
Aircraft Damage: Substantial
Passenger Injuries: 1 Minor 
Aircraft Fire: None
Ground Injuries: 
Aircraft Explosion: None
Total Injuries: 2 Minor
Latitude, Longitude: 33.049845,-97.232237

No comments:

Post a Comment