# NTSB WPR10CA282: Great Lakes 2T-1A-2, N6075L, Chandler, AZ, May 31, 2010 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: May 31, 2010, 09:45 local (16:45 UTC) - Place: Chandler, AZ - Coordinates: 33.26889, -111.811111 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=33.2689&lon=-111.8111&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: 2 uninjured - Status: Completed, report July 22, 2010 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 76271 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR10CA282 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/76271/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=76271 - Page: https://openairdocs.org/ntsb/WPR10CA282 ## Probable cause The pilot’s failure to maintain directional control and the flight instructor's inadequate remedial action during the landing roll, which resulted in a ground loop. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Great Lakes 2T-1A-2, 5 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=3910101), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Great Lakes 2T-1A-2, 4 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=3910101), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md) - [Attention/monitoring: monitoring other person](https://openairdocs.org/ntsb-findings/02021535): Personnel issues › Psychological · Instructor/check pilot (probable cause); cases with it: [Great Lakes 2T-1A-2, 1 case](https://openairdocs.org/ntsb-findings/02021535/cases.md?model=3910101), [All aircraft, 200 cases](https://openairdocs.org/ntsb-findings/02021535/cases.md) - [Action: delayed action](https://openairdocs.org/ntsb-findings/02041025): Personnel issues › Action/decision · Instructor/check pilot (probable cause); cases with it: [Great Lakes 2T-1A-2, 1 case](https://openairdocs.org/ntsb-findings/02041025/cases.md?model=3910101), [All aircraft, 894 cases](https://openairdocs.org/ntsb-findings/02041025/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: [Great Lakes 2T-1A-2, 4 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=3910101), [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: [Great Lakes 2T-1A-2, 3 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=3910101), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) ## Analysis After performing air work, the certificated flight instructor (CFI) and airline transport pilot (ATP) returned back to the airport where the ATP would conduct touch-and-go practice takeoffs and landings in the tailwheel-equipped airplane. The first three landings were uneventful and they had planned for the fourth to be a full stop with the airplane configured for a three-point landing. Following a normal approach and touchdown, the airplane was on the landing roll when it suddenly turned to the left 30 degrees relative to the runway centerline. Both pilots applied full right rudder, but the airplane continued the left turn and exited the runway surface. The airplane ground looped, coming to rest facing approximately 270 degrees from the runway centerline. The pilots both reported that there were no pre impact mechanical failures or malfunctions with the airframe or engine. ## Factual narrative In a written statement, the certificated flight instructor (CFI) reported that the purpose of the flight was for him to conduct an aerobatic lesson with the airline transport pilot (ATP) in a tail wheel-equipped airplane. After performing air work, the pilots returned back to the airport and the ATP decided to try touch-and-go practice takeoffs and landings. The first three landings were uneventful and he had planned for the fourth to be a full stop with the airplane configured for a three-point landing. Following a normal approach and touchdown, the airplane was on the landing roll when it suddenly turned to the left 30 degrees relative to the runway centerline. Both pilots applied full right rudder, but the airplane continued the left turn. The CFI attempted to apply light right brake pressure but the airplane exited the left side of the runway and ground looped. The airplane came to a rest facing approximately 270 degrees from the runway centerline; during the accident sequence, damage was incurred to the right wing tip and left aileron. The pilots both reported that there were no pre impact mechanical failures or malfunctions with the airframe or engine. ## Aircraft - Registration: [N6075L](https://openairdocs.org/aircraft/N6075L), registered now, S/N 0716, built 1976 (OpenAirDocs) - Reported make and model: GREAT LAKES 2T-1A-2 - Registry model: [Great Lakes 2T-1A-2](https://openairdocs.org/model/great-lakes-2t-1a-2) (registry code 3910101) (OpenAirDocs) - Registry engine: [Lycoming AEIO-360 series](https://openairdocs.org/engine/lycoming-aeio-360-series) (registry code 41522, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 0716 - Airframe hours: 9093 - Engines: LYCOMING AEIO-360 SER 180 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Operator: Chandler Air Service Inc - Registered owner: Chandler Air Service Inc - Airworthiness certificate: Standard, Aerobatic; Standard, Normal - Last inspection: 100 hour, March 13, 2010 - Departed: KCHD, Chandler, AZ - Destination: KCHD, Chandler, AZ - Airport: KCHD, Chandler Municipal Airport, runway 22L, 4,800 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Flight instructor; age 59; injuries: none; commercial, flight instructor; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review June 18, 2009; seat: front; flight hours: 6,264 total, 500 in this make and model, 6,050 as pilot in command, 270 in the last 90 days, 90 in the last 30 days, 5 in the last 24 hours - Pilot; age 68; injuries: none; airline transport, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 3, with waivers/limitations; last flight review March 3, 2010; seat: rear; flight hours: 4,788 total, 13 in this make and model, 4,300 as pilot in command, 22 in the last 90 days, 8 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 35 statute miles - Lowest ceiling: none - Temperature: 81 °F, dew point 36 °F - Altimeter: 29.93 inHg - Observed at: KCHD ## 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 20100531005549A](https://openairdocs.org/incident/20100531005549A), May 31, 2010: Great Lakes 2T-1A-2, Chandler, AZ, Minor damage. 05/31/10 At approximately 09:45 MST at the Chandler airport kchd, a grklks-2T1-A2, piloted by [privacy data omitted] did ground loop while landing, causing… ## Docket (1 files) The files NTSB released with the investigation on June 18, 2010, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=76271. 461 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 461 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40331520&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.