ANC08LA046

NTSB accident investigation · Piper PA-32 · Koliganek, AK · April 1, 2008

Accident · Minor injuriesLimited investigationFinal report
Date
April 1, 2008, 15:40 local (23:40 UTC)
Place
Koliganek, AK
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N8327SPiper PA-32
Defining event
Maneuvering: Loss of visual reference
Weather
Instrument (IMC) · Day
Status
Completed · report December 11, 2008
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
FAA-AL-ANC FSDO 03
FAA report
20080401831969A
Case key
67751

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

On this page

Probable cause

The pilot's VFR flight into adverse weather conditions that resulted in a collision with snow-covered terrain during a turn to reverse direction. Factors contributing to the accident were low ceilings, flat lighting conditions, and the snow-covered terrain.

Findings · 4

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.

Light condition: flat lightEnvironmental issues › Conditions/weather/phenomena · Effect on personnelPiper PA-32-301: 1 caseAll aircraft: 42 casesProbable cause
Terrain: snowy/icy terrainEnvironmental issues › Physical environment · Contributed to outcomePiper PA-32-301: 1 caseAll aircraft: 77 casesProbable cause
Action: incorrect action selectionPersonnel issues › Action/decision · PilotPiper PA-32-301: 1 caseAll aircraft: 397 casesProbable cause
Ceiling/visibility/precip: low visibilityEnvironmental issues › Conditions/weather/phenomena · Contributed to outcomePiper PA-32-301: 1 caseAll aircraft: 175 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 reported that he was in cruise flight about 700 feet agl over near featureless snow-covered terrain when he encounter lowering ceilings. He described the weather conditions as rapidly deteriorating. He began a turn to reverse direction, and the airplane collided with terrain. His destination, about 10 miles away, was reporting a visibility of 2 miles in mist, and a ceiling of 400 feet broken. The ceiling was variable between 200 to 900 feet. A low ceiling and snow-covered terrain likely produced flat lighting conditions, making visual reference to terrain, and determining height above the ground difficult.

Factual narrative

On April 1, 2008, about 1540 Alaska daylight time, a Piper PA-32 airplane, N8327S, sustained substantial damage when it collided with snow-covered terrain while in cruise flight, about 10 miles south-southwest of Koliganek, Alaska. The airplane was being operated as a visual flight rules (VFR) cross-country air taxi flight under Title 14, CFR Part 135, when the accident occurred. The airplane was operated as Flight 245, by Peninsula Airways Inc., Anchorage, Alaska. The commercial certificated pilot, the sole occupant, received minor injuries. Instrument meteorological conditions prevailed in the area of the accident. VFR company flight following procedures were in effect. The flight originated at the Dillingham Airport, Dillingham, Alaska, about 1510, and was en route to Koliganek, with cargo and mail.

During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), on April 2, the director of operations for the operator reported that the pilot was on the first segment of his flight from Dillingham, then to Koliganek, then to New Stuyahok, Alaska, and return to Dillingham. The pilot did not arrive in Koliganek, and an emergency locator transmitter (ELT) signal was received from the airplane. The pilot was located by search and rescue personnel about 2040, and transported to Koliganek by snow machine.

In a written statement from the pilot on April 3, he reported that he was in cruise flight about 700 feet agl, and the visibility was good until about 20 miles from Koliganek. The weather began to deteriorate rapidly, and the pilot decided to turn around. The airplane then collided with terrain.

Personnel from the operator reported that when they arrived at the accident scene to begin recovery operations, they found that the airplane collided with almost featureless snow-covered terrain on a northwest heading. They reported the right main landing gear separated first, followed by the left main gear, followed by an impact that separated the right wing.

At 1540, a special observation at Koliganek was reporting in part: Wind, 130 degrees (true) at 15 knots; visibility, 2 statute miles in mist; clouds, 400 feet broken, 1,300 feet broken, 8,500 feet overcast; temperature, 34 degrees F; dew point, 32 degrees F; altimeter, 29.67 inHg. Remarks; ceiling variable from 200 to 900 feet.

Aircraft

Registration
N8327S
Reported as
Piper PA-32
Category
Airplane
Serial number
32-8106039
Airframe hours
15,026
Engine
Lycoming IO-540K, 300 horsepower, reciprocating
Damage
Substantial damage
Flight
Part 135
Operator
Peninsula Airways Inc.
Registered owner
Peninsula Airways Inc.
Airworthiness certificate
Standard, Normal
Last inspection
AAIP · March 8, 2008 · 84 hours before
Departed
PADL · Dillingham, AK
Destination
PAJZ · Koliganek, 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
52
Injuries
Minor
Certificates
Flight instructor, Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 1, With waivers/limitations
Last flight review
March 24, 2008
Seat
Left
Flight hours
3,669 total · 33 in this make and model · 2,440 as pilot in command · 33 in the last 90 days · 33 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Instrument (IMC) · Day
Wind
130° at 15 knots
Visibility
2 statute miles
Lowest ceiling
400 ft broken
Temperature
34 °F, dew point 32 °F
Altimeter
29.67 inHg
Observed at
PAJZ, 10 nm away

Docket · 1

The files NTSB released with the investigation on November 20, 2008, on NTSB’s docket system: statements, records, photos and specialists’ reports. 774 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.

Other investigations on N8327S · 1

Matched to the same aircraft by N-number and date.