# NTSB SEA02LA127: Bredl Fokker DR1, N43SB, Troutdale, OR, July 10, 2002 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: July 10, 2002, 12:15 local (19:15 UTC) - Place: Troutdale, OR - Coordinates: 45.549446, -122.40139 - Nearby events: https://openairdocs.org/map.md?lat=45.5494&lon=-122.4014&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report April 8, 2003 - Report: Approved by Office Director - Parties: FAA FSDO (Portland) - NTSB case key (mKey): 55200 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA02LA127 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/55200/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=55200 - Page: https://openairdocs.org/ntsb/SEA02LA127 ## Probable cause The collapse, for undetermined reasons, of the left main landing gear spoked-wheel structure. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Nose over, landing - roll - landing gear,wheel - collapsed (cause) ## Analysis According to the pilot, during his landing on runway 25, the aircraft bounced slightly and then touched down "normally," but during the landing roll, the left main wheel structure collapsed and the aircraft nosed over onto its top wing. This scenario was confirmed by a witness who was working near the runway and who had seen the aircraft land. An inspection of the wheel disclosed that all but three wire spokes had pulled out of the wheel rim. The pilot said that he had not noticed any loose spokes prior to takeoff, but that the grass strip he departed from was "pretty rough." The reason for the separation of the spokes from the wheel rim was not positively determined. ## Factual narrative On July 10, 2002, approximately 1215 Pacific daylight time, an experimental Bredl Fokker DR1 amateur-built triplane, N43SB, was substantially damaged in a nose over accident following the collapse of the left main wheel during the landing roll at Portland-Troutdale Airport, Troutdale, Oregon. The airline transport pilot, who was the airplane's sole occupant, was not injured, but the aircraft, which is owned and operated by the pilot, sustained substantial damage. Visual meteorological conditions, with winds from 310 degrees true at 5 knots, were reported at Portland-Troutdale at 1220. No flight plan had been filed for the 14 CFR Part 91 personal flight. The flight departed Evergreen Field in Vancouver, Washington, about 1200. According to the pilot, during his landing on runway 25, the aircraft bounced slightly and then touched down "normally," but during the landing roll, the left main wheel structure collapsed and the aircraft nosed over onto its top wing. This scenario was confirmed by a witness who was working near the runway and who had seen the aircraft land. An inspection of the wheel disclosed that all but three wire spokes had pulled out of the motorcycle style wheel rim. The pilot said that he had not noticed any loose spokes prior to takeoff, but that the grass strip he departed from was "pretty rough." The reason for the separation of the spokes from the wheel rim was not positively determined. ## Aircraft - Registration: [N43SB](https://openairdocs.org/deregistered/N43SB-2015-05-21), registration cancelled 2015-05-21, S/N 29590ABV, built 1996 (OpenAirDocs) - Reported make and model: Bredl Fokker DR1 - Registry model: [Bredl Siegfried Friedrich J FOKKER DR 1](https://openairdocs.org/model/bredl-siegfried-friedrich-j-fokker-dr-1) (registry code 05602EX) (OpenAirDocs) - Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: 29590ABV - Engines: Lycoming O-320 reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Gerald S. Brown - Airworthiness certificate: Special, Experimental (Special) - Departed: 59S, Vancouver, WA - Destination: TTD, Troutdale, OR - Airport: TTD, Portland-Troutdale Airport, runway 25, 5,400 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 46; injuries: none; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: front; flight hours: 10,000 total, 125 in the last 90 days ## Weather - Conditions: Visual (VMC), Day - Wind: 290° at 5 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 90 °F, dew point 59 °F - Altimeter: 29.95 inHg - Observed at: TTD ## 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 20020710018539A](https://openairdocs.org/incident/20020710018539A), Jul 10, 2002: Amtr FOKKERDR1, Portland, OR, Substantial damage. (-23) According to PIC and witness, after normal touchdown, during roll-out left main wheel separated from axle, a/c flipped over. Damage consisted of left… ## Docket (1 files) The files NTSB released with the investigation on December 23, 2002, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=55200. 9 KB in all. - No Supporting Documentation (item 1, .PDF, 9 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40173850&FileExtension=.PDF&FileName=No%20Supporting%20Documentation-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.