# NTSB ANC99LA112: Cessna 170B, N2806C, Wasilla, AK, July 1, 1999 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: June 30, 1999, 17:00 local (Jul 1, 1999, 01:00 UTC) - Place: Wasilla, AK - Location: 61.5720° N, 149.5396° W: Placed by OpenAirDocs at WASILLA (IYS), within about a mile (OpenAirDocs) - Nearby events: https://openairdocs.org/map.md?lat=61.5720&lon=-149.5396&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report June 23, 2000 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - NTSB case key (mKey): 47158 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC99LA112 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/47158/pdf - Page: https://openairdocs.org/ntsb/ANC99LA112 ## Probable cause The student pilot's inadvertent ground loop during the takeoff roll. A factor in this accident was the a left crosswind. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of control - on ground/water, takeoff - roll/run - weather condition - crosswind (contributing factor) - ground loop/swerve - inadvertent, pilot in command (cause) - Main gear collapsed, takeoff - roll/run ## Analysis The solo student pilot was attempting to takeoff with a 10 knot left crosswind. He told the NTSB investigator-in-charge the airplane's nose initially swerved right. The pilot said he overcorrected, and the 29 inch tundra tires grabbed the warm, dry, newly surfaced asphalt. The airplane ground looped to the left, collapsing the right main landing gear assembly, and damaging the right wing. The pilot had accumulated 24 hours of total flight experience at the time of the accident. ## Factual narrative On June 30, 1999, about 1700 Alaska daylight time, a tundra tire equipped Cessna 170B airplane, N2806C, sustained substantial damage when it ground looped during takeoff from the New Wasilla Airport, Wasilla, Alaska. The solo student pilot was not injured. The flight was conducted under 14 CFR Part 91 as a Visual Flight Rules (VFR) solo training flight. Visual meteorological conditions prevailed at the time of the accident, and no flight plan was filed. The pilot told the NTSB investigator-in-charge (IIC), during a telephone interview on August 12, that during the initial takeoff from runway 21, the airplane's nose initially swerved right. The pilot said he overcorrected, the 29 inch by 11 inch tires grabbed the warm, dry, newly surfaced asphalt, and the airplane ground looped to the left. The right wingtip struck the runway, the right main landing gear support structure failed, and the right main landing gear assembly collapsed. The pilot described a 90 degree left crosswind of 10 knots. Runway 21 measures 3,700 feet long by 75 feet wide. The pilot had accumulated about 24 hours of total flight experience, all in the accident airplane, at the time of the accident. ## Aircraft - Registration: [N2806C](https://openairdocs.org/aircraft/N2806C), registered now, S/N 26349 (OpenAirDocs) - Reported make and model: Cessna 170B - Registry model: [Cessna 170B](https://openairdocs.org/model/cessna-170b) (registry code 2072306) (OpenAirDocs) - Category: Airplane - Serial number: 26349 - Airframe hours: 6844 - Engines: Continental O-300 145 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Operator: Robert W. Cellars - Registered owner: Charles Morris - Airworthiness certificate: Standard, Normal - Last inspection: Annual, June 15, 1999 - Departed: IYS - Airport: IYS, New Wasilla, runway 21, 3,700 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 44; student; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 24 total, 24 in this make and model, 24 as pilot in command, 24 in the last 90 days, 24 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 120° at 10 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 75 °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 19990630023059A](https://openairdocs.org/incident/19990630023059A), Jun 30, 1999: Cessna 170B, Wasilla, AK, Substantial damage. (.19) On June 30, 1999, about 1700 Alaska daylight time, a tundra tire equipped Cessna 170B airplane, N2806C, sustained substantial damage when it ground… ## Other investigations on N2806C (2) 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 ANC86LA096](https://openairdocs.org/ntsb/ANC86LA096), Jul 1, 1986: Cessna 170B (N2806C), Alexander Creek, AK, substantial damage - [NTSB MKC68F0241](https://openairdocs.org/ntsb/MKC68F0241), Sep 17, 1967: Cessna 170B (N2806C), Howard Lake, MN, substantial damage 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.