ANC20CA052

NTSB accident investigation · Air Tractor AT802 · Unalakleet, AK · June 1, 2020

Accident · No injuriesClass 4 · Data collectionFinal report
Date
May 31, 2020, 16:17 local (Jun 1, 2020, 00:17 UTC)
Place
Unalakleet, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N779DAAir Tractor AT802
Defining event
Takeoff: Collision during takeoff/land
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Alaska Regional Office
Parties
FAA
FAA report
20200531011809A
Case key
101365

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

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Probable cause

The pilot's failure to maintain terrain clearance during the departure, which resulted in a collision with terrain..

Findings · 3

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: altitudeAircraft › Aircraft oper/perf/capability · Not attained/maintainedAir Tractor AT-802A: 14 casesAll aircraft: 1,310 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotAir Tractor AT-802A: 17 casesAll aircraft: 9,295 casesProbable cause
Terrain: mountainous/hilly terrainEnvironmental issues › Physical environment · Effect on operationAir Tractor AT-802A: 5 casesAll aircraft: 329 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 of the amphibious scooper air tanker airplane, reported that while preforming aerial firefighting operations, he heard ground firefighters express concern over the radio about their equipment "being too close to the fire line." In response, the pilot landed at a small lake to fill the airplane's water hopper tank with water to drop on the fire. During the departure from the lake, the airplane’s left float struck a "small hill" that was about 20 ft above ground level. The pilot proceeded to fly the airplane to a nearby airport and made an uneventful landing. A postaccident examination of the airplane revealed substantial damage to the fuselage. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.

Aircraft

Registration
N779DA
Reported as
Air Tractor AT802 (FIREBOSS)
Category
Airplane
Serial number
802A-0779
Built
2018
Airframe hours
205.4
Engine
Pratt & Whitney PT6A-67F, 1,600 horsepower, turbo prop
Damage
Substantial damage
Flight
Firefighting · Part 91
Operator
Aero Spray Inc, doing business as Dauntless Air
Registered owner
Aero Spray Inc
Airworthiness certificate
Special, Restricted (Special)
Last inspection
Annual · March 19, 2020
Departed
GAL · Galena, AK
Destination
GAL · Galena, AK
Equipment
Electronic multifunction display, Electronic primary flight display, Handheld GPS, Data recorder, Onboard weather, ADS-B, Satellite tracking device, 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

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
50
Injuries
None
Certificates
Commercial, Flight instructor
Airplane ratings
Multi-engine land, Single-engine sea, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Without waivers/limitations
Last flight review
March 1, 2020
Seat
Single
Flight hours
11,000 total · 2,000 in this make and model · 10,700 as pilot in command · 35 in the last 90 days · 30 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
90° at 15 knots, gusting 22
Visibility
10 statute miles
Lowest ceiling
None
Altimeter
29.45 inHg
Observed at
PAUN, 15 nm away

Docket · 3

The files NTSB released with the investigation on August 10, 2020, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.2 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.