# NTSB WPR10CA291: Cessna 188B, N9357K, Blackfoot, ID, June 14, 2010 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: June 13, 2010, 19:30 local (Jun 14, 2010, 01:30 UTC) - Place: Blackfoot, ID - Coordinates: 43.209167, -112.349441 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=43.2092&lon=-112.3494&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report October 21, 2010 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 76318 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR10CA291 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/76318/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=76318 - Page: https://openairdocs.org/ntsb/WPR10CA291 ## Probable cause A loss of directional control during the landing roll as a result of a worn tail wheel locking mechanism. ## 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); cases with it: [Cessna B188B, 1 case](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=2073010), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md) - [Landing gear system: nose/tail landing gear](https://openairdocs.org/ntsb-findings/01023220): Aircraft › Aircraft systems · Not specified (probable cause); cases with it: [Cessna B188B, 1 case](https://openairdocs.org/ntsb-findings/01023220/cases.md?model=2073010), [All aircraft, 185 cases](https://openairdocs.org/ntsb-findings/01023220/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Cessna B188B, 1 case](https://openairdocs.org/ntsb-events/230/sequence.md?model=2073010), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Runway excursion](https://openairdocs.org/ntsb-events/300); cases with it: [Cessna B188B, 1 case](https://openairdocs.org/ntsb-events/300/sequence.md?model=2073010), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) ## Analysis The pilot stated that he was returning from an aerial application practice flight, in a tailwheel-equipped airplane, to practice wheel only touch-and-go takeoffs and landings. The first four landings were uneventful. During the fifth and final landing, the airplane touched down and bounced approximately one foot into the air. The airplane stabilized and the main wheels touched down for a second time. As the tail wheel touched down approximately two-thirds down the runway, it started to shimmy “violently” and the airplane veered to the left. The pilot corrected the airplane back to the right. The intensity of the shimmy increased and despite the pilot’s control inputs, the airplane exited the right side of the runway and ground looped. The airplane’s left wing was substantially damaged. Post-accident examination of the tail wheel assembly revealed wear on the locking mechanism. Additionally, “snake-like” skid marks were found on the runway that appeared to be the result of a tail wheel shimmy. ## Factual narrative The pilot stated he was returning from an aerial application practice flight, in a tail wheel-equipped airplane, to practice wheel only touch-and-go takeoffs and landings. The first four landings were uneventful. During the fifth and final landing, the airplane touched down and bounced approximately one foot into the air. The airplane stabilized and the main wheels touched down for a second time. As the tail wheel touched down approximately two-thirds down the runway, it started to shimmy “violently” and the airplane veered to the left. The pilot corrected the airplane back to the right. The intensity of the shimmy increased and despite the pilot’s control inputs, the airplane exited the right side of the runway and ground looped. The airplane’s left wing was substantially damaged. Post-accident examination of the tail wheel assembly revealed wear on the locking mechanism. Additionally, “snake-like” skid marks were found on the runway that appeared to be the result of a tail wheel shimmy. ## Aircraft - Registration: [N9357K](https://openairdocs.org/aircraft/N9357K), registered now, S/N 18803937T, built 1982 (OpenAirDocs) - Reported make and model: CESSNA 188B - Registry model: [Cessna B188B](https://openairdocs.org/model/cessna-b188b) (registry code 2073010) (OpenAirDocs) - Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 18803937T - Engines: Continental IO-520 300 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Vector Disease Control Inc - Registered owner: Vector Disease Control Inc - Airworthiness certificate: Special, Restricted (Special) - Departed: KU02, Blackfoot, ID - Destination: KU02, Blackfoot, ID - Airport: KU02, McCarley Field Airport, runway 19, 4,314 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 49; injuries: none; flight instructor, commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review May 18, 2010; seat: center; flight hours: 5,170 total, 1 in this make and model, 4,899 as pilot in command, 60 in the last 90 days, 35 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 170° at 4 knots - Visibility: 10 statute miles - Lowest ceiling: 9,500 ft broken - Temperature: 64 °F, dew point 41 °F - Altimeter: 30.12 inHg - Observed at: PIH, 24 nm away ## 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 20100613035709A](https://openairdocs.org/incident/20100613035709A), Jun 13, 2010: Cessna B188B, Blackfoot, ID, Substantial damage. Landed on runway 19 at Blackfoot, Idaho. At arrpximatly 1200' from the end of the runway the aircraft veered right. The pilot stated that there was a violent… ## Docket (1 files) The files NTSB released with the investigation on July 14, 2010, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=76318. 523 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 523 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40331807&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.