DEN03LA112

NTSB accident investigation · Air Tractor AT-301 · Glendo, WY · June 27, 2003

Accident · No injuriesLimited investigationFinal report
Date
June 27, 2003, 10:15 local (16:15 UTC)
Place
Glendo, WY
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N4406SAir Tractor AT-301
Weather
Visual (VMC) · Day
Status
Completed · report November 25, 2003
Report
Approved by Office Director
Parties
Federal Aviation Administration
FAA report
20030627012589A
Case key
57321

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 clearance from the trees. Factors contributing to the accident were the low altitude, the high density altitude, and the trees.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

In flight collision with objectManeuvering - aerial application
Clearance - not maintainedPilot in commandCause
Altitude - lowFactor
Weather condition - high density altitudeFactor
Object - tree(s)Factor
Emergency procedure - attemptedPilot in command
In flight collision with terrain/waterDescent - uncontrolled
Terrain condition - ground

Analysis

The pilot said he was performing aerial application at low altitude. The pilot reported that the airplane failed to respond as expected during his pull-up and turn. The pilot said he chose to perform an emergency landing to avoid rising terrain. The airplane struck trees and the terrain causing substantial damage to the right wing, undercarriage, and fuselage. An examination of the airplane's systems revealed no anomalies. Approximately 200 gallons of chemical was recovered from the airplane's hopper. Density altitude at the time of the accident was 6,506 feet mean sea level.

Factual narrative

On June 27, 2003, approximately 1015 mountain daylight time, an Air Tractor AT-301, N4406S, operated by Frontier Aviation Inc., was substantially damaged when it impacted terrain while conducting aerial application approximately 10 miles east of Glendo, Wyoming. Visual meteorological conditions prevailed, and no flight plan had been filed for the local agricultural flight being conducted under Title 14 CFR Part 137. The commercial pilot reported no injuries. The flight originated at 0930.

In his written statement, the pilot said he was performing aerial application at low altitude. The pilot reported that the airplane failed to respond as expected during his pull-up and turn. The pilot said he chose to perform an emergency landing to avoid rising terrain. The airplane struck trees and the terrain. The landing gear failed and the airplane skidded sideways to a stop. An examination of the airplane showed substantial damage to the right wing, undercarriage, and fuselage. Flight control continuity was confirmed. An examination of the engine, engine controls, and other airplane systems revealed no anomalies.

Approximately 200 gallons of chemical was recovered from the airplane's hopper. Density altitude at the time of the accident was 6,506 feet mean sea level.

Aircraft

Registration
N4406S
Reported as
Air Tractor AT-301
Category
Airplane
Serial number
AT3010066
Airframe hours
6,042
Engine
Pratt & Whitney R-1340-AN-1, 600 horsepower, reciprocating
Damage
Substantial damage
Flight
Aerial application · Part 137
Registered owner
Frontier Aviation
Airworthiness certificate
Special, Restricted (Special)
Last inspection
Annual · August 9, 2002 · 191 hours before
Departed
EAN · Wheatland, WY

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
53
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Last flight review
February 18, 2003
Seat
Center
Flight hours
2,880 total · 191 in this make and model · 2,880 as pilot in command · 130 in the last 90 days · 40 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
310° at 6 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
68 °F, dew point 48 °F
Altimeter
30.11 inHg
Observed at
DGW, 35 nm away

FAA reports on this event · 1

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