# NTSB ANC96LA135: Cessna 206, N733KD, Port Alsworth, AK, September 2, 1996 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: September 2, 1996, 15:30 local (23:30 UTC) - Place: Port Alsworth, AK - Coordinates: 60.199516, -154.279754 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=60.1995&lon=-154.2798&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 15, 1997 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - NTSB case key (mKey): 2890 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC96LA135 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/2890/pdf - Page: https://openairdocs.org/ntsb/ANC96LA135 ## Probable cause the pilot's improper in-flight planning/decision, which resulted in intering a box canyon with insufficient altitude to either execute a turn to safety or outclimb rising terrain. A factor associated with the accident was: the pilot allowed the passenger to influence him to enter the canyon. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - In flight collision with terrain/water, climb - terrain condition - mountainous/hilly - terrain condition - blind/box canyon - in-flight planning/decision - improper, pilot in command (cause) - pressure induced by others, passenger (contributing factor) - altitude/clearance - not maintained, pilot in command (cause) - Nose over, other ## Analysis The pilot stated the passenger talked him into flying up a canyon, which appeared to be a pass at the time they entered. Once inside the canyon, the pilot realized there was insufficient room to complete a 180 degree turn. He applied full power and attempted to climb straight ahead. After reaching about 2,800 feet above sea level, the airplane's floats struck the ground. The airplane slide approximately 15 feet, then nosed over. ## Factual narrative On September 2, 1996, at 1530 Alaska daylight time, a wheel equipped Cessna 206 airplane, N733KD, registered to and operated by Lake Clark Air, Inc., collided with terrain and nosed over after entering and maneuvering in a narrow canyon. The air taxi flight, operating under 14 CFR Part 135, departed Port Alsworth, Alaska, and the destination was Lake Tazimina near Port Alsworth. A company visual flight rules flight plan was in effect and visual meteorological conditions prevailed. The airline transport certificated pilot and the passenger were not injured. The airplane received substantial damage. According to the pilot, he allowed the passenger to talk him into flying up the narrow canyon which appeared to be a pass at the time he entered. After entering the canyon he realized he would be unable to make a 180 degree turn and he applied maximum power. The terrain was rising steeply and he was attempting to reach the top of the pass. The airplane contacted the ground at the 2,800 foot level of the pass. The pilot stated the pass was 3,000 feet high. After the airplane's floats hit the ground, the airplane slid approximately 15 feet. The nose of the floats dug into the dirt and the airplane nosed over. ## Aircraft - Registration: [N733KD](https://openairdocs.org/aircraft/N733KD), registered now, S/N U20604772, built 1978 (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: 04772 - Airframe hours: 7745 - Engines: Continental IO-520-F 300 horsepower reciprocating - Damage: Substantial damage - Flight: Part 135 - Operator: Lake Clark Air, doing business as The Farm - Registered owner: Glen R. Alsworth - Airworthiness certificate: Standard, Normal - Last inspection: 100 hour, August 13, 1996, 73 hours before - Departed: AK - Destination: LAKE TAZIMINA, AK - Flight plan: Company VFR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 55; airline transport; airplane ratings: multi-engine land, single-engine sea, multi-engine sea, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 12,054 total, 14 in this make and model, 8,431 as pilot in command, 382 in the last 90 days, 155 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 20 statute miles - Lowest ceiling: none - Temperature: 61 °F ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 19960902025349A](https://openairdocs.org/incident/19960902025349A), Sep 2, 1996: Cessna U206G, Port Alsworth, AK, Substantial damage. (.19) On September 2, 1996, at 1530 Alaska daylight time, a wheel equipped Cessna 206 airplane, N733KD, registered to and operated by lake clark air, inc.,… 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.