# NTSB WPR11CA034: Cessna U206B, N3488L, Cascade, ID, November 2, 2010 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: November 2, 2010, 14:12 local (20:12 UTC) - Place: Cascade, ID - Coordinates: 44.492221, -116.014442 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=44.4922&lon=-116.0144&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Nose over/nose down](https://openairdocs.org/ntsb-events/096) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report March 16, 2011 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Boise FSDO - NTSB case key (mKey): 77718 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR11CA034 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/77718/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=77718 - Page: https://openairdocs.org/ntsb/WPR11CA034 ## Probable cause The pilot's failure to maintain clearance from terrain during a turn onto the final approach leg of the traffic pattern. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause) - [Runway/land/takeoff/taxi surface: soft surface](https://openairdocs.org/ntsb-findings/03023020): Environmental issues › Physical environment · Contributed to outcome - [Terrain: mountainous/hilly terrain](https://openairdocs.org/ntsb-findings/03021010): Environmental issues › Physical environment · Response/compensation (probable cause) ## Analysis The pilot, who was flying the second airplane in a flight of two, was maneuvering in the traffic pattern at a remote back-country airstrip. The approach to the airstrip required the pilots to make a precise base leg to final turn between two steep rock cliffs. During the accident pilot's turn to final approach, he inadvertently made too wide of a turn, resulting in the airplane's nose and right main landing gear colliding with the cliff and becoming separated from the airframe. After the pilot in the other airplane confirmed the extent of the damage, the pilot flying the accident airplane maneuvered to a town where emergency personnel could be available on the ground. Due to the damage, the pilot decided to land in the grass/turf area alongside the main runway. During the landing roll, the nose gear strut dug into the soft terrain and the airplane nosed over onto its back. ## Factual narrative The pilot, who was flying the second airplane in a flight of two, was maneuvering in order to turn from base to final for a full-stop landing at a remote back country airstrip. The approach to the airstrip required the pilots to make a precise base to final turn between two steep rock cliffs. During the accident pilot's turn to final, he inadvertently let the turn become too wide, resulting in his nose gear and his right main gear coming in contact with the cliff on the outside of his turn. The contact with the cliff resulted in the separation of the wheel from the nose gear strut, and the separation of the entire right main landing gear assembly. After the pilot in the other airplane confirmed the extent of the damage, the pilot flying the accident airplane flew out of the back country to a town where emergency personnel could be available on the ground. Because he was missing portions of his landing gear system, the pilot decided to land in the grass/turf area alongside the main runway. Although the touchdown was successful, during the landing roll, the nose gear strut dug into the soft terrain, and the airplane nosed over onto its back. ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Approach-VFR pattern final: Controlled flight into terr/obj (CFIT)](https://openairdocs.org/ntsb-events/120) - [Landing-landing roll: Nose over/nose down](https://openairdocs.org/ntsb-events/096) (defining event) ## Aircraft - Registration: [N3488L](https://openairdocs.org/deregistered/N3488L-2012-09-10), registration cancelled 2012-09-10, S/N U206-0788 (OpenAirDocs) - Reported make and model: CESSNA U206B - Registry model: [Cessna U206B](https://openairdocs.org/model/cessna-u206b) (registry code 2073322) (OpenAirDocs) - Category: Airplane - Serial number: U206-0788 - Engines: Continental Motors IO-520B reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Scott W. Patrick - Registered owner: Scott W. Patrick - Airworthiness certificate: Standard, Normal - Departed: Wilson Bar, ID - Destination: U70, Cascade, ID - Airport: U70, Cascade, runway 30, 4,300 × ft, dirt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 26; injuries: none; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review September 30, 2010; flight hours: 2,800 total, 1,700 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 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 20101102054039A](https://openairdocs.org/incident/20101102054039A), Nov 2, 2010: Cessna U206B, Cascade, ID, Substantial damage. The pilot took off from wilson bar airstrip in the Idaho back country on a part 91 reposition flight. During the approach to land at south fork ranch in the… ## Other investigations on N3488L (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 SEA00LA120](https://openairdocs.org/ntsb/SEA00LA120), Jul 2, 2000: Cessna U206B (N3488L), Yellow Pine, ID, substantial damage. Probable cause: The locknut was not secured and backed off the bolt. An improper maintenance installation was a factor. ## Docket (1 files) The files NTSB released with the investigation on November 14, 2010, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=77718. 731 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 731 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40339339&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF 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.