# NTSB ANC95LA069: Christen Industries A-1, N9622V, Tyonek, AK, June 11, 1995 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: June 10, 1995, 19:00 local (Jun 11, 1995, 03:00 UTC) - Place: Tyonek, AK - Coordinates: 61.080764, -151.159606 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=61.0808&lon=-151.1596&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report November 30, 1995 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - NTSB case key (mKey): 2659 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC95LA069 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/2659/pdf - Page: https://openairdocs.org/ntsb/ANC95LA069 ## Probable cause THE PILOT'S SELECTION OF AN UNSUITABLE LANDING SITE. A FACTOR ASSOCIATED WITH THE ACCIDENT IS THE ROUGH AND UNEVEN SANDBAR. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - On ground/water encounter with terrain/water, landing - roll - terrain condition - sand bar - terrain condition - rough/uneven (contributing factor) - unsuitable terrain or takeoff/landing/taxi area - selected, pilot in command (cause) - Main gear collapsed, landing - roll - landing gear,main gear - overload - Nose down, landing - roll ## Analysis THE PILOT REPORTED HE WAS LANDING ON A SANDBAR NEAR THE MOUTH OF A RIVER WHEN HE NOTICED A 'SIGNIFICANT' DEPRESSION IN THE SANDBAR DURING THE LANDING ROLL. HE SAID THE AIRPLANE WAS GOING TOO FAST TO STOP, AND TOO SLOW TO ATTEMPT TO TAKEOFF AND MISS THE DEPRESSION. THE AIRPLANE SUSTAINED SUBSTANTIAL DAMAGE WHEN IT ENCOUNTERED THE ROUGH TERRAIN. ## Factual narrative On June 10, 1995, about 1900 Alaska daylight time, a wheel equipped Christen A-1 "Husky" airplane, N9622V, registered to the pilot/operator, sustained substantial damage while landing on a sandbar at the mouth of the Olsen River. The accident location is approximately 12 miles north of Tyonek, Alaska. The airline transport certificated pilot and the sole passenger aboard were not injured. The personal flight operated in visual meteorological conditions without a flight plan. The pilot reported that during the landing roll he saw a "significant" depression in the sandbar, but that the airplane was going too fast to stop, and too slow to abort the landing and attempt to takeoff. He said the right main landing gear axle failed upon encountering the depression, the airplane swung to the right, and then the left main landing gear collapsed, allowing the airplane to nose down. ## Aircraft - Registration: [N9622V](https://openairdocs.org/aircraft/N9622V), registered now, S/N 1154, built 1990 (OpenAirDocs) - Reported make and model: Christen Industries A-1 - Registry model: [Christen Industries A-1](https://openairdocs.org/model/christen-industries-a-1) (registry code 221020X) (OpenAirDocs) - Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 1154 - Airframe hours: 436 - Engines: LYCOMING O-360-C1G 180 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Richard L. Cline - Airworthiness certificate: Standard, Normal - Last inspection: Annual, November 1, 1994, 436 hours before - Departed: EDF, ANCHORAGE, AK ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 44; commercial, airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: front; flight hours: 3,988 total, 120 in this make and model, 3,700 as pilot in command, 20 in the last 90 days, 6 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Visibility: 100 statute miles - Lowest ceiling: none - Temperature: 70 °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 19950610017859A](https://openairdocs.org/incident/19950610017859A), Jun 10, 1995: Chris A1, Tyonek, AK, Substantial damage. Struck a ditch landing on a sandbar. Broke right main axle. Veered sharply collapsed left main gear. ## Other investigations on N9622V (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 ANC22LA072](https://openairdocs.org/ntsb/ANC22LA072), Sep 1, 2022: Christen Industries A-1 (N9622V), Point MacKenzie, AK, substantial damage. Probable cause: The pilot’s improper monitoring and failure to maintain airspeed during a critical phase of flight, which resulted in an exceedance of the airplane’s critical angle of attack, an aerodynamic stall,… - [NTSB ANC06CA077](https://openairdocs.org/ntsb/ANC06CA077), Jun 19, 2006: Christen Industries A-1 (N9622V), Takotna, AK, substantial damage. Probable cause: The pilot's excessive use of brakes during the landing roll. A factor associated with the accident was soft terrain. 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.