WPR11CA023

NTSB accident investigation · Air Tractor AT-802 · Fort Hunter Liggett, CA · October 21, 2010

Accident · No injuriesData collectionFinal report
Date
October 21, 2010, 16:47 local (23:47 UTC)
Place
Fort Hunter Liggett, CA
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N4247UAir Tractor AT-802
Weather
Visual (VMC) · Day
Status
Completed · report March 16, 2011
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
Federal Aviation Administration
FAA report
20101021050599A
Case key
77651

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 misjudged glide path, which resulted in a runway undershoot and collision with terrain during landing.

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.

Object/animal/substance: debris/dirt/foreign objectEnvironmental issues › Physical environment · Contributed to outcomeAll aircraft: 101 cases
Performance/control parameters: glideAircraft › Aircraft oper/perf/capability · Not attained/maintainedAll aircraft: 7 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotAll 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 was conducting a short-field landing demonstration on a dirt airstrip. During the landing approach, the tailwheel impacted a berm of dirt located at the approach end of the airstrip. The nose pitched down and the propeller struck the runway, followed by the main landing gear. The airplane then bounced back into the air and the pilot added engine power. The airplane skidded to the left, resulting in the right main landing gear and tailwheel separating during the impact sequence. The pilot indicated that he should have landed farther down the airstrip. He reported no preimpact mechanical anomalies with the airplane that would have precluded normal operation.

Factual narrative

The pilot was conducting a short-field landing demonstration on a dirt airstrip. During the landing approach, the tailwheel impacted a berm of dirt located at the approach end of the airstrip. The nose pitched down and the propeller struck the runway, followed by the main landing gear. The airplane then bounced back into the air, the pilot added power, and the airplane skidded to the left. The right main landing gear and tailwheel separated during the impact sequence. The pilot indicated that he should have landed farther down the airstrip. No mechanical anomalies were reported.

Aircraft

Registration
N4247U
Reported as
Air Tractor AT-802
Category
Airplane
Serial number
802-4001
Airframe hours
187
Engine
Pratt and Whitney PT6A-67F, 1,600 horsepower, turbo prop
Damage
Substantial damage
Flight
Flight test · Part 91
Operator
Air Tractor Inc
Registered owner
Air Tractor Inc
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · July 7, 2010
Departed
PVT · Fort Hunter Liggett, CA
Destination
PVT · Fort Hunter Liggett, CA
Airport
PVT · Schoonover Strip (Private), runway 09, 6,000 × 50 ft, dirt

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
69
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
September 1, 2010
Seat
Front
Flight hours
25,000 total · 1,500 in this make and model · 24,000 as pilot in command · 75 in the last 90 days · 25 in the last 30 days · 5 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
180° at 8 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
61 °F, dew point 52 °F
Altimeter
30.01 inHg
Observed at
PRB, 35 nm away

Docket · 3

The files NTSB released with the investigation on November 22, 2010, 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.