CEN21LA202

NTSB accident investigation · Boeing A75 · Denver, CO · April 26, 2021

Accident · No injuriesClass 4 · LimitedFinal report
Date
April 26, 2021, 13:46 local (19:46 UTC)
Place
Denver, CO
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N56760Boeing A75
Defining event
Landing-landing roll: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Central Region
Parties
Federal Aviation Administration
FAA report
20210426007329A
Case key
102987

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

The pilot’s failure to maintain directional control during the landing roll with variable and gusty wind conditions.

Findings · 4

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedBoeing A75: 2 casesAll aircraft: 3,958 casesProbable cause
Wind: variable windEnvironmental issues › Conditions/weather/phenomena · Contributed to outcomeBoeing A75: 1 caseAll aircraft: 113 casesProbable cause
Wind: gustsEnvironmental issues › Conditions/weather/phenomena · Effect on operationBoeing A75: 1 caseAll aircraft: 1,199 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotBoeing A75: 4 casesAll aircraft: 9,295 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

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 o to 290o with gusts to 20 knots.

Factual narrative

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 tudder 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.

Aircraft

Registration
N56760
Reported as
Boeing A75
Category
Airplane
Serial number
75-017
Built
1936
Airframe hours
5,345
Engine
P&W R-985-AN-1, 350 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Wings over the Rockies Air and Space Museum
Airworthiness certificate
Standard, Normal
Last inspection
Annual · March 3, 2021
Departed
GXY · Greeley, CO
Destination
Same as departure
Airport
A75 · Centennial Airport, runway 28, 4,800 × 75 ft, asphalt
Equipment
ADS-B

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
52
Injuries
None
Certificates
Airline transport, Flight instructor
Airplane ratings
Single-engine sea, Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, With waivers/limitations
Last flight review
February 24, 2021
Seat
Rear
Restraint
4-point
Flight hours
18,725 total · 61 in this make and model · 14,600 as pilot in command · 35 in the last 90 days · 30 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
270° at 8 knots, gusting 25
Visibility
10 statute miles
Lowest ceiling
20,000 ft broken
Temperature
73 °F, dew point 7 °F
Altimeter
29.59 inHg
Observed at
APA

Docket · 3

The files NTSB released with the investigation on July 8, 2021, on NTSB’s docket system: statements, records, photos and specialists’ reports. 4.4 MB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.

Other investigations on N56760 · 2

Matched to the same aircraft by N-number and date.