ANC09TA092

NTSB accident investigation · Aviat A-1B · Gulkana, AK · September 3, 2009

Accident · No injuriesFinal report
Date
September 3, 2009, 12:08 local (20:08 UTC)
Place
Gulkana, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N37HYAviat A-1B
Defining event
Landing-landing roll: Nose over/nose down
Weather
Visual (VMC) · Day
Status
Completed · report August 12, 2010
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
U.S. Department of the Interior
FAA report
20090903048659A
Case key
74652

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 excessive use of brakes during an off-airport landing, resulting in the airplane nosing over.

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.

Aircraft capability: braking capabilityAircraft › Aircraft oper/perf/capability · Incorrect use/operationAviat A-1B: 2 casesAll aircraft: 57 casesProbable cause
Use of equip/info: use of equip/systemPersonnel issues › Task performance · PilotAviat A-1B: 4 casesAll aircraft: 1,391 casesProbable cause
Terrain: sloped/uneven terrainEnvironmental issues › Physical environment · Contributed to outcomeAviat A-1B: 1 caseAll aircraft: 270 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

The pilot was on a federal public use wildlife surveillance flight under Title 14, Code of Federal Regulations Part 91. The pilot reported that while landing at an off-airport site he applied the brakes too hard and the airplane nosed over. He reported that there were no preaccident mechanical anomalies, and that the airplane sustained substantial damage to both wing lift struts, the vertical stabilizer, and the tops of the wings.

Factual narrative

On September 3, 2009, about 1208 Alaska daylight time, a tailwheel equipped, Aviat Husky A-1B airplane, N37HY, sustained substantial damage when it nosed over during landing at an off airport site, about 19 miles east of Gulkana, Alaska. The airplane was being operated by the U.S. Park Service, Department of Interior, as a visual flight rules (VFR) public use flight, under Title 14, CFR Part 91, when the accident occurred. The solo commercial pilot was not injured. Visual meteorological conditions prevailed, and company flight following procedures were in effect. During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) on September 3, a spokesperson for the Park Service said the pilot was on a wildlife enforcement surveillance flight, and reported that the airplane nosed over during landing at the off airport site. He said there were no known mechanical anomalies with the airplane prior to the accident, and that the airplane sustained substantial damage to the wings, fuselage, and vertical stabilizer. In a written statement to the NTSB dated September 5, an investigator for the Department of the Interior, reported that the pilot said he had applied the brakes too hard during landing at the off-airport site, and the airplane nosed over.

Aircraft

Registration
N37HY
Reported as
Aviat A-1B
Category
Airplane
Serial number
2037
Airframe hours
2,311
Engine
Lycoming O-360-A1D, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Public aircraft - federal · Public use
Operator
United States Department Of Interior, doing business as U.S. Park Service
Registered owner
United States Department Of Interior
Airworthiness certificate
Standard, Normal
Last inspection
Annual · August 27, 2009
Departed
GKN · Gulkana, AK
Destination
Gulkana, AK
Flight plan
Company VFR

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
45
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine sea, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
April 30, 2008
Seat
Front
Flight hours
1,700 total · 1,350 in this make and model · 1,600 as pilot in command

Weather

Conditions
Visual (VMC) · Day
Wind
Variable at 6 knots, gusting 8
Visibility
10 statute miles
Lowest ceiling
18,000 ft overcast
Temperature
54 °F, dew point 39 °F
Altimeter
29.77 inHg
Observed at
PAGK, 19 nm away

Docket · 2

The files NTSB released with the investigation on July 7, 2010, on NTSB’s docket system: statements, records, photos and specialists’ reports. 846 KB 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.