CEN20CA079

NTSB accident investigation · Air Tractor AT-504 · Fort Morgan, CO · February 8, 2020

Accident · No injuriesData collectionFinal report
Date
February 8, 2020, 12:40 local (19:40 UTC)
Place
Fort Morgan, CO
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N970FAAir Tractor AT-504
Defining event
Landing: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed · report August 17, 2020
Report
Approved by Office Director
NTSB office
Central Region
Parties
FAA
FAA report
20200208000759A
Case key
100930

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 improper landing flare, which resulted in a bounced landing, and his subsequent failure to maintain directional control, which resulted in the left main landing gear tire bursting and the tailwheel assembly failing.

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.

Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotAir Tractor AT-504: 1 caseAll aircraft: 9,295 casesProbable cause
Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedAir Tractor AT-504: 1 caseAll aircraft: 3,958 casesProbable cause
Performance/control parameters: landing flareAircraft › Aircraft oper/perf/capability · Not attained/maintainedAir Tractor AT-504: 1 caseAll aircraft: 1,285 casesProbable cause
Action: lack of actionPersonnel issues › Action/decision · Instructor/check pilotAir Tractor AT-504: 1 caseAll aircraft: 792 cases

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

According to the pilot on the controls in the left seat, the right seat pilot was familiarizing him with the airplane. The airplane bounced during landing on the runway. During the landing roll, the airplane veered left, and he overcorrected to the right, followed by an overcorrection to the left. He applied heavy braking, and the airplane turned 120° to the right. The side load on the left main landing gear tire resulted in it bursting. The wheel rim then dug into the runway, the airplane bounced, the tailwheel assembly failed, and the tail spring steel strut then dug into the soft surface. The airplane sustained substantial damage to the aft fuselage and the empennage.

Factual narrative

Both pilot's onboard the airplane reported that the purpose of the flight was to familiarize the pilot in the left seat with the airplane, of which he was appropriately rated yet had never flown. According to the pilot on the controls in the left seat, the tailwheel-equipped airplane bounced during landing on the asphalt runway. During the landing roll, the airplane veered to the left and he overcorrected to the right, followed by an overcorrection to the left. He applied heavy braking and the airplane turned 120° to the right and exited the right side of the runway. The left main landing gear tire deflated, and the wheel dug into the dirt surface. The airplane bounced, and the tailwheel-assembly failed and dug into the soft surface. The airplane sustained damage to the aft fuselage and the empennage.

Aircraft

Registration
N970FA
Reported as
Air Tractor AT-504 (No Series)
Category
Airplane
Serial number
504-4028
Built
2015
Airframe hours
1,331.8
Engine
Pratt & Whitney PT-6-34AG, 750 horsepower, turbo prop
Damage
Substantial damage
Flight
Instructional · Part 91
Operator
CO Fire Aviation
Registered owner
CO Fire Aviation
Airworthiness certificate
Special, Restricted (Special)
Last inspection
Annual · October 2, 2019
Departed
FMM · Fort Morgan, CO
Destination
FMM · Fort Morgan, CO
Airport
FMM · Fort Morgan Muni, runway 32, 5,731 × 75 ft, asphalt
Equipment
ADS-B, Stall warning system

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 · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
32
Injuries
None
Certificate
Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
January 19, 2019
Seat
Left
Restraint
5-point
Flight hours
2,824 total · 2 in this make and model · 2,726 as pilot in command · 20 in the last 90 days
Role
Flight instructor
Age
58
Injuries
None
Certificates
Flight instructor, Airline transport
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
May 18, 2019
Seat
Right
Restraint
5-point
Flight hours
15,186 total · 37 in this make and model · 1,500 as pilot in command · 62 in the last 90 days · 13 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
40° at 7 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
59 °F, dew point 23 °F
Altimeter
29.62 inHg
Observed at
KFMM

Docket · 2

The files NTSB released with the investigation on April 2, 2020, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.4 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.