# NTSB GAA17CA524: Boeing A75N1(PT17), N52813, Oshkosh, WI, September 3, 2017 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Data collection · Final report - Date: September 3, 2017, 16:10 local (21:10 UTC) - Place: Oshkosh, WI - Coordinates: 43.985279, -88.576667 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=43.9853&lon=-88.5767&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing: Nose over/nose down](https://openairdocs.org/ntsb-events/096) - Highest injury: Minor injuries - Injuries: 1 minor, 1 uninjured - Status: Completed, report November 27, 2017 - Report: Approved by Office Director - NTSB office: General Aviation Accidents - Parties: FAA - NTSB case key (mKey): 95976 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=GAA17CA524 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/95976/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=95976 - Page: https://openairdocs.org/ntsb/GAA17CA524 ## Probable cause The pilot’s overapplication of the brakes, which resulted in the biplane coming to rest inverted. ## 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 · Capability exceeded (probable cause); cases with it: [Boeing A75N1(PT17), 2 cases](https://openairdocs.org/ntsb-findings/01062045/cases.md?model=1380134), [All aircraft, 238 cases](https://openairdocs.org/ntsb-findings/01062045/cases.md) - [Landing gear system: brake](https://openairdocs.org/ntsb-findings/01023242): Aircraft › Aircraft systems · Incorrect use/operation (probable cause); cases with it: [Boeing A75N1(PT17), 1 case](https://openairdocs.org/ntsb-findings/01023242/cases.md?model=1380134), [All aircraft, 297 cases](https://openairdocs.org/ntsb-findings/01023242/cases.md) - [Use of equip/info: use of equip/system](https://openairdocs.org/ntsb-findings/02063015): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Boeing A75N1(PT17), 2 cases](https://openairdocs.org/ntsb-findings/02063015/cases.md?model=1380134), [All aircraft, 1,391 cases](https://openairdocs.org/ntsb-findings/02063015/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing: Nose over/nose down](https://openairdocs.org/ntsb-events/096) (defining event); cases with it: [Boeing A75N1(PT17), 11 cases](https://openairdocs.org/ntsb-events/096/sequence.md?model=1380134), [All aircraft, 2,287 cases](https://openairdocs.org/ntsb-events/096/sequence.md) ## Analysis The pilot of the tailwheel-equipped biplane reported that, during the landing roll, about halfway down the grass runway, the biplane "very quickly" inverted. After exiting the biplane, he examined the runway and saw where the propeller had dug in and viewed skid marks in the grass "where it was obvious that the brakes had been applied and locked up." The airplane sustained substantial damage to the vertical and horizontal stabilizer. The pilot reported that there were no preaccident mechanical failures or malfunctions with the biplane that would have precluded normal operation. The automated weather observation system about 1 nautical mile from the accident site reported, about the time of the accident, wind from 230° at 7 knots, gusting to 14 knots. The pilot landed on runway 31. ## Factual narrative The pilot of the tailwheel-equipped biplane reported that, during the landing roll, about half way down the grass runway, the biplane "very quickly" became upside down. After exiting the biplane, he examined the runway and saw where the propeller had dug in and viewed skid marks in the grass "where it was obvious that the brakes had been applied and locked up." Subsequently, the airplane sustained substantial damage to the vertical and horizontal stabilizer. The pilot reported that there were no preaccident mechanical failures or malfunctions with the biplane that would have precluded normal operation. The automated weather observation system about 1 nautical mile from the accident site reported, about the time of the accident, the wind was 230° at 7 knots, gusting to 14 knots. The pilot landed on runway 31. ## Aircraft - Registration: [N52813](https://openairdocs.org/aircraft/N52813), registered now, S/N 75-394, built 1940 (OpenAirDocs) - Reported make and model: BOEING A75N1(PT17) (UNDESIGNAT) - Registry model: [Boeing A75N1(PT17)](https://openairdocs.org/model/boeing-a75n1-pt17) (registry code 1380134) (OpenAirDocs) - Registry engine: [Continental W670 series](https://openairdocs.org/engine/continental-w670-series) (registry code 17018, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 75-394 - Year built: 1940 - Airframe hours: 7121 - Engines: Continental W-670-6N 220 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Airworthiness certificate: Standard, Aerobatic; Standard, Normal; Standard, Utility - Last inspection: Annual, September 7, 2017 - Departed: WS17, Oshkosh, WI - Destination: WS17, Oshkosh, WI - Airport: WS17, Pioneer, runway 31, 1,988 × 130 ft, grass/turf - Equipment: None ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 56; injuries: minor; flight instructor, commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review October 23, 2016; seat: rear; restraint: 3-point; flight hours: 3,378 total, 34 in this make and model, 2,485 as pilot in command, 42 in the last 90 days, 16 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 230° at 7 knots, gusting 14 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 79 °F, dew point 57 °F - Altimeter: 29.89 inHg - Observed at: KOSH, 1 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 20170903017569A](https://openairdocs.org/incident/20170903017569A), Sep 3, 2017: Boeing A75N1(PT17), Oshkosh, WI, Substantial damage. On September 3, 2017, at 1609 CST, N52813 registered as a Boeing A75N1 (PT17) airplane piloted by a commercial pilot, was damaged when landing at Pioneer… ## Other investigations on N52813 (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 MIA69D0486](https://openairdocs.org/ntsb/MIA69D0486), Jun 9, 1969: Boeing A75 (N52813), Kendall, FL, substantial damage ## Docket (2 files) The files NTSB released with the investigation on October 31, 2017, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=95976. 1.2 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 959 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40457535&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.PDF - Accident Photo (Courtesy of FAA) (item 2, .PDF, 1 photo, 266 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40457536&FileExtension=.PDF&FileName=Accident%20Photo%20(Courtesy%20of%20FAA)-Master.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.