# NTSB ANC93LA108: Cessna 206, N1801Q, Skwentna, AK, July 2, 1993 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: July 2, 1993, 10:00 local (18:00 UTC) - Place: Skwentna, AK - Coordinates: 61.92921, -151.730026 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=61.9292&lon=-151.7300&mi=10 - Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report August 31, 1994 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - NTSB case key (mKey): 2374 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC93LA108 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/2374/pdf - Page: https://openairdocs.org/ntsb/ANC93LA108 ## Probable cause THE PILOT'S SELECTION OF UNSUITABLE TERRAIN. FACTORS RELATED TO THE ACCIDENT WERE: THE SUBMERGED SAND BAR AND THE PILOT'S EXCESSIVE TAXISPEED. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - On ground/water encounter with terrain/water, taxi - from landing - unsuitable terrain or takeoff/landing/taxi area - selected, pilot in command (cause) - terrain condition - water - taxispeed - excessive, pilot in command (contributing factor) - terrain condition - hidden obstruction(s) (contributing factor) - terrain condition - sand bar (contributing factor) - Nose over, taxi - from landing ## Analysis THE FLOATPLANE PILOT WAS ON A POSITIONING FLIGHT TO MEET FISHERMEN AND TRANSPORT THEM TO A DIFFERENT LOCATION. AFTER LANDING ON A RIVER, THE PILOT WAS STEP TAXIING INTO A SIDE CHANNEL THAT WAS USED TO LOAD AND OFFLOAD PASSENGERS. HE STATED THAT AS THE FLOATPLANE WAS COMING OFF-THE-STEP (SLOWING), IT HIT A SUBMERGED SANDBAR THAT COULD NOT BE SEEN AND NOSED OVER. ## Factual narrative On July 2, 1993, at 1000 Alaska daylight time, a float equipped Cessna 206 airplane, N1801Q, registered to Alaska Bush Carriers, Inc. of Anchorage, Alaska, and operated by the pilot in command, nosed over while taxiing from a landing at the confluence of Lake Creek and the Yetna River, approximately 10 miles southeast of Skwentna, Alaska. The commercial certificated pilot in command, the sole occupant, was not injured and the airplane sustained substantial damage. The positioning flight, operating under 14 CFR Part 91, last departed the Lake Hood Seaplane Base at approximately 0930 and the destination was the accident site. A company flight plan was filed and visual meteorological conditions prevailed. During a telephone interview, the pilot in command told the NTSB investigator in charge that just after coming off of the step from a water landing, the airplane collided with a sandbar and nosed over. The pilot reported that the landing was performed to pick up a group of sport fishermen. ## Aircraft - Registration: [N1801Q](https://openairdocs.org/deregistered/N1801Q-2013-06-18), registration cancelled 2013-06-18, S/N U20602925, built 1975 (OpenAirDocs) - Reported make and model: CESSNA 206 - Registry model: [Cessna U206F](https://openairdocs.org/model/cessna-u206f) (registry code 2073333) (OpenAirDocs) - Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: U20602925 - Airframe hours: 3866 - Engines: CONTINENTAL IO-520-F 300 horsepower reciprocating - Damage: Substantial damage - Flight: Positioning, Part 91 - Operator: Alaska Bush Carriers - Registered owner: Alaska Bush Carriers - Airworthiness certificate: Standard, Normal - Last inspection: Annual, June 25, 1993, 23 hours before - Departed: LHD, ANCHORAGE, AK - Flight plan: Company VFR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 52; commercial, flight instructor; airplane ratings: single-engine land, single-engine sea, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 3,140 total, 821 in this make and model, 3,044 as pilot in command, 6 in the last 90 days, 4 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 300° at 5 knots - Visibility: 20 statute miles - Lowest ceiling: none - Temperature: 54 °F, dew point 46 °F - Altimeter: 29.00 inHg ## 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 19930702022039A](https://openairdocs.org/incident/19930702022039A), Jul 2, 1993: Cessna U206F, Skwentna, AK, Substantial damage. Struck a hidden submerged log coming off step taxi. Seaplane nosed over in river. ## Other investigations on N1801Q (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 ANC96LA142](https://openairdocs.org/ntsb/ANC96LA142), Sep 3, 1996: Cessna 206 (N1801Q), Port Alsworth, AK, substantial damage. Probable cause: The pilot's inadequate compensation for the wind conditions. A factor associated with the accident was the unfavorable wind. 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.