Sunday, July 25, 2021

Loss of Control on Ground: Boeing A75, N56760; accident occurred April 26, 2021 at Centennial Airport (KAPA), Arapahoe County, Colorado

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; Denver, Colorado

Investigation Docket - National Transportation Safety Board:

Wings Over the Rockies Air & Space Museum

Location: Denver, Colorado
Accident Number: CEN21LA202
Date & Time: April 26, 2021, 13:46 Local 
Registration: N56760
Aircraft: Boeing A75 
Aircraft Damage: Substantial
Defining Event: Loss of control on ground 
Injuries: 1 None
Flight Conducted Under: Part 91: General aviation - Personal


The pilot reported that, during landing in the tailwheel-equipped airplane and as the tailwheel touched down on the runway, the airplane suddenly veered to the right. The pilot attempted to correct with opposite rudder; however, the airplane veered hard to the left and exited the left side of the runway, despite the pilot’s use of right rudder and braking. The airplane subsequently nosed over and came to rest inverted. The airplane sustained substantial damage to the top left wing, vertical stabilizer, and rudder. A Federal Aviation Administration inspector reported that a postaccident examination of the airplane revealed no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operations. At the time of the accident, the pilot was landing on runway 28 with wind reported as variable 050° to 290° with gusts to 20 knots.

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 directional control during the landing roll with variable and gusty wind conditions.


Aircraft Directional control - Not attained/maintained
Environmental issues Variable wind - Contributed to outcome
Environmental issues Gusts - Effect on operation
Personnel issues Aircraft control - Pilot

Factual Information

The pilot reported that when the tailwheel equipped airplane approached the airport, the wind was variable from 290 to 050 degrees, gusting to 20 knots. While on a two mile final, the tower controller reported the wind was 290 degrees at 7 knots. The airplane touched down on the main landing gear with no noteable crosswind. As the tailwheel touched down, the airplane suddenly veered to the right; the pilot corrected with left rudder and the airplane veered hard to the left. The pilot attempted to add right rudder and brake, but to no avail. The airplane exited the left side of the runway onto the dirt when it nosed over and came to rest inverted. The upper wing and rudder were substantially damaged.

Postaccident examination by a Federal Aviation Administration inspector did not reveal any anomalies with the airplane that would have precluded normal operations.

History of Flight

Landing-landing roll Other weather encounter
Landing-landing roll Loss of control on ground (Defining event)
Landing-landing roll Runway excursion
Landing-landing roll Nose over/nose down

Pilot Information

Certificate: Airline transport; Flight instructor
Age: 52,Male
Airplane Rating(s): Single-engine land; Single-engine sea; 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 single-engine; Instrument airplane
Toxicology Performed:
Medical Certification: Class 1 With waivers/limitations
Last FAA Medical Exam: February 24, 2021
Occupational Pilot: Yes 
Last Flight Review or Equivalent: February 24, 2021
Flight Time: 18725 hours (Total, all aircraft), 61 hours (Total, this make and model), 14600 hours (Pilot In Command, all aircraft), 35 hours (Last 90 days, all aircraft), 30 hours (Last 30 days, all aircraft), 2 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: Boeing 
Registration: N56760
Model/Series: A75 
Aircraft Category: Airplane
Year of Manufacture: 1936 
Amateur Built: No
Airworthiness Certificate: Normal
Serial Number: 75-017
Landing Gear Type: Tailwheel
Seats: 2
Date/Type of Last Inspection: March 3, 2021 Annual
Certified Max Gross Wt.: 3200 lbs
Time Since Last Inspection: 
Engines: 1 Reciprocating
Airframe Total Time: 5345 Hrs as of last inspection
Engine Manufacturer: P&W
ELT: C126 installed, activated, did not aid in locating accident
Engine Model/Series: R-985-AN-1
Registered Owner: 
Rated Power: 350 Horsepower
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: APA,5885 ft msl 
Distance from Accident Site: 0 Nautical Miles
Observation Time: 18:53 Local 
Direction from Accident Site:
Lowest Cloud Condition: Scattered / 14000 ft AGL
Visibility 10 miles
Lowest Ceiling: Broken / 20000 ft AGL 
Visibility (RVR):
Wind Speed/Gusts: 8 knots / 25 knots
Turbulence Type Forecast/Actual: None / None
Wind Direction: 270°
Turbulence Severity Forecast/Actual: N/A / N/A
Altimeter Setting: 29.59 inches Hg 
Temperature/Dew Point: 23°C / -14°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Greeley, CO (GXY)
Type of Flight Plan Filed: None
Destination: Denver, CO 
Type of Clearance: None
Departure Time: 13:15 Local
Type of Airspace: Class D

Airport Information

Airport: Centennial Airport A75
Runway Surface Type: Asphalt
Airport Elevation: 5885 ft msl
Runway Surface Condition: Dry
Runway Used: 28 
IFR Approach: None
Runway Length/Width: 4800 ft / 75 ft
VFR Approach/Landing: Straight-in

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: 39.57011,-104.8492

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