ANC11LA048

NTSB accident investigation · Dehavilland DHC-3T · Bettles Field, AK · May 28, 2011

Accident · No injuriesLimited investigationFinal report
Date
May 28, 2011, 14:00 local (22:00 UTC)
Place
Bettles Field, AK
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N87AWDehavilland DHC-3T
Defining event
Landing-landing roll: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed · report October 4, 2011
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
FAA FSDO-01
FAA report
20110528025039A
Case key
80785

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 selection of unsuitable terrain for the landing, which resulted in a loss of directional control.

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: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedDehavilland DHC-3: 2 casesAll aircraft: 3,958 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotDehavilland DHC-3: 4 casesAll aircraft: 9,295 casesProbable cause
Runway/land/takeoff/taxi surface: soft surfaceEnvironmental issues › Physical environment · Contributed to outcomeDehavilland DHC-3: 1 caseAll aircraft: 264 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 landing at a remote, private airstrip. He said the landing area was soft, and as the airplane touched down it veered to the left. His efforts to abort the landing with the runway remaining was unsuccessful. The airplane exited the right side of the landing area and collided with a fuel tank farm. The airplane sustained substantial damage to the right wing, aileron, and the fuselage. The pilot said there were no mechanical malfunctions with the airplane that would have precluded normal operation.

Factual narrative

On May 28, 2011, about 1400 Alaska daylight time, a De Havilland DHC-3T airplane, N87AW, sustained substantial damage during landing at a private airstrip, about 80 miles northwest of Bettles Field, Alaska. The airplane was being operated by Alaska West Air, Kenai, Alaska, as a visual flight rules (VFR) passenger flight under 14 Code of Federal Regulations, Part 135, when the accident occurred. The commercial pilot and sole passenger were not injured. Visual meteorological conditions prevailed, and company flight following procedures were in effect. The flight departed Coldfoot, Alaska, about 1300. During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) on May 29, the director of operations for the operator said the airplane ran off the end of the runway into a fuel tank farm. He said the airplane's right wing and aileron were damaged when the airplane struck a fuel storage tank. No mechanical anomalies prior to the accident were reported by the pilot. In a written statement to the NTSB dated August 1, the pilot said the landing area was soft, and after touching down the airplane veered a little to the left, and he corrected to the right. When he attempted to come back to the left, he didn't have enough rudder and brake authority to bring the airplane to the left, and not enough runway remaining to abort the landing. He was unable to stop the airplane before it collided with fuel spill equipment.

Aircraft

Registration
N87AW
Reported as
Dehavilland DHC-3T
Category
Airplane
Serial number
52
Airframe hours
24,169
Engine
Pratt & Whitney PT6A, 750 horsepower, turbo prop
Damage
Substantial damage
Flight
Part 135
Operator
Alaska West Air Inc, doing business as Alaska West Air
Registered owner
Summit Leasing LLC
Airworthiness certificate
Standard, Normal
Last inspection
Annual · May 20, 2011
Departed
PACX · Coldfoot, AK
Destination
Bettles Field, AK
Flight plan
Company VFR
Airport
Sun Private

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
52
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
May 26, 2011
Seat
Left
Flight hours
9,000 total · 1,500 in this make and model · 2,000 as pilot in command · 55 in the last 90 days · 30 in the last 30 days · 4 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
180° at 7 knots
Visibility
100 statute miles
Lowest ceiling
None

Docket · 1

The files NTSB released with the investigation on August 18, 2011, on NTSB’s docket system: statements, records, photos and specialists’ reports. 292 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.