# NTSB ANC99LA118: Cessna 206, N5446X, Anaktuvuk Pass, AK, August 22, 1999 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: August 22, 1999, 13:30 local (21:30 UTC) - Place: Anaktuvuk Pass, AK - Coordinates: 68.150039, -151.710205 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=68.1500&lon=-151.7102&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report December 4, 2000 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - NTSB case key (mKey): 47164 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC99LA118 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/47164/pdf - Page: https://openairdocs.org/ntsb/ANC99LA118 ## 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 In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - In flight encounter with weather, climb - weather condition - clouds (contributing factor) - became lost/disoriented, pilot in command (cause) - weather condition - rain (contributing factor) - weather condition - fog (contributing factor) - flight into adverse weather - continued, pilot in command (cause) - In flight collision with terrain/water, climb - terrain condition - mountainous/hilly - terrain condition - rising (contributing factor) - terrain condition - blind/box canyon (contributing factor) ## 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](https://openairdocs.org/deregistered/N5446X-2017-04-26), registration cancelled 2017-04-26, S/N U20605762, built 1980 (OpenAirDocs) - Reported make and model: Cessna 206 - Registry model: [Cessna U206G](https://openairdocs.org/model/cessna-u206g) (registry code 2073356) (OpenAirDocs) - Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: U20605762 - Airframe hours: 826 - Engines: 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 ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 52; 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) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB ANC81FA022](https://openairdocs.org/ntsb/ANC81FA022), Feb 6, 1981: Cessna U206G (N5446X), Karluk Lake, AK, substantial damage, 2 fatal From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.