# NTSB WPR21LA195: Gulfstream American AA-5B, N51LL, Hillsboro, OR, May 12, 2021 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: May 12, 2021, 14:50 local (21:50 UTC) - Place: Hillsboro, OR - Coordinates: 45.431456, -122.93964 - Nearby events: https://openairdocs.org/map.md?lat=45.4315&lon=-122.9396&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Defining event: [Takeoff-rejected takeoff: Runway excursion](https://openairdocs.org/ntsb-events/300) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed - Report: Approved by Office Director - Investigation class: Class 4 - Basic report with no Prelim publish - NTSB office: Western Pacific Region - NTSB case key (mKey): 103089 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR21LA195 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/103089/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=103089 - Page: https://openairdocs.org/ntsb/WPR21LA195 ## Probable cause The pilot’s delayed remediation following an aborted takeoff run, which resulted in a runway overrun and collision with trees. ## 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 · Not attained/maintained (probable cause); cases with it: [Gulfstream American AA-5B, 1 case](https://openairdocs.org/ntsb-findings/01062045/cases.md?model=3970106), [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: [Gulfstream American AA-5B, 4 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=3970106), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Info processing/decision: decision making/judgment](https://openairdocs.org/ntsb-findings/02041520): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Gulfstream American AA-5B, 1 case](https://openairdocs.org/ntsb-findings/02041520/cases.md?model=3970106), [All aircraft, 3,098 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md) - [Object/animal/substance: tree(s)](https://openairdocs.org/ntsb-findings/03022020): Environmental issues › Physical environment · Contributed to outcome; cases with it: [Gulfstream American AA-5B, 1 case](https://openairdocs.org/ntsb-findings/03022020/cases.md?model=3970106), [All aircraft, 933 cases](https://openairdocs.org/ntsb-findings/03022020/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Takeoff-rejected takeoff: Runway excursion](https://openairdocs.org/ntsb-events/300) (defining event); cases with it: [Gulfstream American AA-5B, 3 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=3970106), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) - [Takeoff-rejected takeoff: Collision during takeoff/land](https://openairdocs.org/ntsb-events/490); cases with it: [Gulfstream American AA-5B, 1 case](https://openairdocs.org/ntsb-events/490/sequence.md?model=3970106), [All aircraft, 1,309 cases](https://openairdocs.org/ntsb-events/490/sequence.md) ## Analysis The pilot reported that, he was on a long cross-country flight and had stopped at several airports along the way. He reported that during a takeoff run, he accelerated to rotation speed and heard the stall warning horn oral alert when he attempted to lift the nosewheel off the ground. The pilot elected to abort the takeoff as the airplane did not appear to be accelerating sufficiently. At the time, the airplane was about halfway down the runway. According to the pilot, as there was between 800-1,200 ft of runway remaining at the time, he retarded the throttle and applied some brake pressure, but the airplane did not decelerate as he had anticipated. The pilot recounted that he took his feet off the rudder pedals multiple times to ensure they were correctly placed. He then applied maximum pressure to the brake pedals, but the airplane overran the runway end, traversed a road, and impacted trees. The wings were substantially damaged. The pilot stated that the brake system did not perform as he had anticipated. However, postaccident examination of the brake system did not reveal any anomalies. Further, the pilot reported that he did not experience any abnormalities with the brakes when he used them to stop at other airports during other legs of the cross-country flight. ## Aircraft - Registration: [N51LL](https://openairdocs.org/deregistered/N51LL-2022-10-08), registration cancelled 2022-10-08, S/N AA5B0916, built 1978 (OpenAirDocs) - Reported make and model: GULFSTREAM AMERICAN CORP AA-5B - Registry model: [Gulfstream American AA-5B](https://openairdocs.org/model/gulfstream-american-aa-5b) (registry code 3970106) (OpenAirDocs) - Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: AA5B0916 - Year built: 1978 - Airframe hours: 5213.4 - Engines: Lycoming O-360-A4K 180 hp reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Santa Barbara Flying Club - Registered owner: Santa Barbara Flying Club - Airworthiness certificate: Standard, Normal - Last inspection: Annual, July 10, 2020, 328.8 hours before - Destination: TIW, Tacoma, WA - Flight plan: VFR - Airport: 7S3, Stark'S Twin Oaks Airpark, runway 02/20, 2,465 × 48 ft, asphalt - Equipment: Electronic flight bag or handheld device, Satellite tracking device, Stall warning system, ADS-B, Auto-pilot ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 47; injuries: none; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: basicmed; last flight review March 8, 2020; seat: left; restraint: 3-point; flight hours: 488 total, 127 in this make and model, 453 as pilot in command, 27 in the last 90 days, 17 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 50° at 7 knots - Visibility: 10 statute miles - Temperature: 79 °F, dew point 48 °F - Altimeter: 30.07 inHg - Observed at: KHIO, 7 nm away - METAR: KHIO 122153Z 05007KT 10SM CLR 26/09 A3007 RMK AO2 SLP180 T02560089 ## 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 20210512008919A](https://openairdocs.org/incident/20210512008919A), May 12, 2021: Gulfstream American Corp AA-5B, Hillsboro, OR, Substantial damage. Aircraft N51LL, a Gulfstream American AA-5B, departed Twin Oaks (7S3) runway 02 at approximately 2145Z. It rolled onto the runway, zero flaps, and the pilot… ## Docket (4 files) The files NTSB released with the investigation on September 1, 2021, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=103089. 13.1 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 1.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12339155&FileExtension=pdf&FileName=6120_Redacted-Rel.pdf - Record of conversation (item 2, PDF, 2 pages, 132 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12338905&FileExtension=pdf&FileName=Record%20of%20Conversation-Rel.pdf - Brake system examination report (item 3, PDF, 13 pages, 6.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12338690&FileExtension=pdf&FileName=Brake%20system%20examination%20report-Rel.pdf - Accident photographs (item 4, PDF, 2 pages, 4.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12339073&FileExtension=pdf&FileName=Accident%20Photographs-Rel.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.