# NTSB WPR12CA007: Great Lakes 2T-1A, N502GL, San Diego, CA, October 13, 2011 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: October 13, 2011, 07:30 local (14:30 UTC) - Place: San Diego, CA - Coordinates: 32.809444, -117.136947 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=32.8094&lon=-117.1369&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: 2 uninjured - Status: Completed, report January 18, 2012 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 82051 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR12CA007 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/82051/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=82051 - Page: https://openairdocs.org/ntsb/WPR12CA007 ## Probable cause The pilot's excessive brake application during landing. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Performance/control parameters: surface speed/braking](https://openairdocs.org/ntsb-findings/01062045): Aircraft › Aircraft oper/perf/capability · Incorrect use/operation (probable cause); cases with it: [Great Lakes 2T-1A, 1 case](https://openairdocs.org/ntsb-findings/01062045/cases.md?model=3910106), [All aircraft, 238 cases](https://openairdocs.org/ntsb-findings/01062045/cases.md) - [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 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=3910106), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/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); cases with it: [Great Lakes 2T-1A, 2 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=3910106), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Nose over/nose down](https://openairdocs.org/ntsb-events/096) (defining event); cases with it: [Great Lakes 2T-1A, 1 case](https://openairdocs.org/ntsb-events/096/sequence.md?model=3910106), [All aircraft, 2,287 cases](https://openairdocs.org/ntsb-events/096/sequence.md) ## Analysis The pilot reported that, during the landing roll, he applied wheel brakes in an effort to turn onto a taxiway. He stated that, when he applied the brakes, the right brake locked up and the airplane subsequently nosed over, coming to rest inverted. The airplane sustained substantial damage to the wing and vertical stabilizer. No preexisting mechanical failures or malfunctions with the airplane were reported. ## Factual narrative The pilot reported that during the landing roll, he applied wheel brakes in an effort to turn onto an approaching taxiway. He stated that when the brakes were applied, the right brake locked up and the airplane subsequently nosed over, coming to a rest inverted. The airplane sustained substantial damage to the wing (top) and vertical stabilizer. No mechanical failures or malfunctions with the airplane were reported. ## Aircraft - Registration: [N502GL](https://openairdocs.org/aircraft/N502GL), registered now, S/N 0502, built 1973 (OpenAirDocs) - Reported make and model: GREAT LAKES 2T-1A - Registry model: [Great Lakes 2T-1A](https://openairdocs.org/model/great-lakes-2t-1a) (registry code 3910106) (OpenAirDocs) - Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 0502 - Airframe hours: 1978 - Engines: LYCOMING O-320 SERIES 180 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Aerobatic - Last inspection: Annual, October 9, 2010, 50 hours before - Departed: MYF, San Diego, CA - Destination: MYF, San Diego, CA - Airport: MYF, Montgomery Field Airport, runway 28L, 3,401 × 60 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 82; injuries: none; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, with waivers/limitations; last flight review April 29, 2011; seat: rear; flight hours: 2,094 total, 239 in this make and model, 2,094 as pilot in command, 8 in the last 90 days, 4 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 66 °F, dew point 46 °F - Altimeter: 29.82 inHg - Observed at: MYF ## 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 20111013024159A](https://openairdocs.org/incident/20111013024159A), Oct 13, 2011: Great Lakes 2T-1A, San Diego, CA, Substantial damage. After touching down during landing on runway 28L, tire marks on the runway showed the right maingear wheel braking hard and pulling the craft to the right of… ## Other investigations on N502GL (3) 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 LAX05LA037](https://openairdocs.org/ntsb/LAX05LA037), Nov 13, 2004: Great Lakes 2T-1A (N502GL), San Diego, CA, substantial damage. Probable cause: the flight instructor's failure to maintain directional control during the landing rollout. - [NTSB LAX02LA080](https://openairdocs.org/ntsb/LAX02LA080), Feb 9, 2002: Great Lakes 2T-1A-1 (N502GL), San Diego, CA, substantial damage. Probable cause: The pilot failed to maintain directional control after encountering a gust of wind during the landing roll. Factors were the unexpected wind gusts and the soft terrain adjacent to the runway. - [NTSB LAX75FUM03](https://openairdocs.org/ntsb/LAX75FUM03), Aug 10, 1974: GR Lakes 2T-1A (N502GL), Holtville, CA, substantial damage ## Docket (1 files) The files NTSB released with the investigation on December 7, 2011, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=82051. 3.9 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 3.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359137&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.