ANC99LA118

NTSB accident investigation · Cessna 206 · Anaktuvuk Pass, AK · August 22, 1999

Accident · No injuriesLimited investigationFinal report
Date
August 22, 1999, 13:30 local (21:30 UTC)
Place
Anaktuvuk Pass, AK
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N5446XCessna 206
Weather
Instrument (IMC) · Day
Status
Completed · report December 4, 2000
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Case key
47164

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 continued flight into adverse weather conditions after becoming lost/disoriented. Factors in the accident were rising terrain, a blind/box canyon, and weather conditions consisting of clouds, rain, and fog.

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 encounter with weatherClimb
Weather condition - cloudsFactor
Became lost/disorientedPilot in commandCause
Weather condition - rainFactor
Weather condition - fogFactor
Flight into adverse weather - continuedPilot in commandCause
In flight collision with terrain/waterClimb
Terrain condition - mountainous/hilly
Terrain condition - risingFactor
Terrain condition - blind/box canyonFactor

Analysis

The private certificated pilot departed from a remote lake, elevation 2,500 feet msl, after a week of hunting and camping. After departure, the pilot proceeded south along a river drainage. The pilot said a light rain was falling at the time, and he was orienting his position by pilotage, using a sectional map, and a topographic map. He said he became disoriented to his exact position, and turned into a small valley that was about five miles north of where he thought he was. The terrain was rising and he began climbing through 4,300 feet msl. Rain began to fall harder and the valley became too narrow to turn around. Clouds began to close around the airplane as he climbed to 5,300 feet msl. The terrain continued to rise, and the pilot noticed his airspeed was decreasing until the stall horn sounded. The airplane collided with rising, open terrain, and the floats were sheared off the airframe. The airplane received damage to the wings, propeller, and fuselage.

Factual narrative

On August 22, 1999, about 1330 Alaska daylight time, a float equipped Cessna 206 airplane, N5446X, sustained substantial damage during an in-flight collision with terrain, about 39 miles east of Anaktuvuk Pass, Alaska, at latitude 68 degrees, 02.529 minutes north, and longitude 150 degrees, 01.672 minutes west. The airplane was being operated as a visual flight rules (VFR) cross-country personal flight when the accident occurred. The airplane was operated by the pilot. The private certificated pilot, and the sole passenger, were not injured. Instrument meteorological conditions prevailed in the area of the accident. A VFR, round-robin flight plan was filed. The flight originated from a remote lake about 1315.

During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), on August 23, 1999, the pilot reported he and his son were hunting and camping at a small lake about 25 miles southwest of Galbraith Lakes, Alaska, for a week before the accident flight. He said he departed the lake, elevation 2,500 feet msl, and began flying south along the Itkillik River. He indicated a light rain was falling at the time, and he was orienting his position by pilotage, using a sectional map, and a topographic map. He said he became disoriented to his exact position, and turned into a small valley that was about five miles north of where he thought he was. The terrain was rising, and he initiated a climb through 4,300 feet msl. Rain began to fall harder and the valley became too narrow to turn around. He said clouds began to close around the airplane as he climbed to 5,300 feet msl. The terrain continued to rise, and he noticed his airspeed was decreasing until the stall horn sounded. Shortly thereafter, he said the airplane collided with rising, open terrain, the floats were sheared off the airframe, and the wings, propeller, and fuselage were damaged.

The emergency locator transmitter (ELT) activated, and personnel from the Gates of the Arctic National Park, Bettles, Alaska, began a search. They located the airplane, but the pilot and passenger had begun to hike out of the area. The pilot and passenger were located later in the day.

Aircraft

Registration
N5446X
Reported as
Cessna 206
Category
Airplane
Serial number
U20605762
Airframe hours
826
Engine
Continental IO-520-F, 300 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Dennis J. Kelly
Airworthiness certificate
Standard, Normal
Last inspection
Annual · July 25, 1999 · 18 hours before
Departed
Galbraith Lake, AK
Destination
PABT · Bettles, AK
Flight plan
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
Certificate
Private
Airplane ratings
Single-engine sea, Single-engine land
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
1,608 total · 837 in this make and model · 1,592 as pilot in command

Weather

Conditions
Instrument (IMC) · Day
Visibility
0.5 statute miles
Lowest ceiling
5,900 ft overcast
Temperature
50 °F

Other investigations on N5446X · 1

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