# NTSB WPR10CA461: Dehavilland Beaver DHC-2 MK.1, N24150, Renton, WA, September 19, 2010 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: September 19, 2010, 15:30 local (22:30 UTC) - Place: Renton, WA - Coordinates: 47.518054, -122.218055 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=47.5181&lon=-122.2181&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Defining event: [Takeoff: Loss of control on ground](https://openairdocs.org/ntsb-events/230) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report March 16, 2011 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration FSDO - NTSB case key (mKey): 77342 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR10CA461 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/77342/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=77342 - Page: https://openairdocs.org/ntsb/WPR10CA461 ## Probable cause The pilot's failure to maintain directional control of the float-equipped airplane during an aborted water takeoff, resulting in a dragged wing. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md) - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [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. - [Takeoff: Other weather encounter](https://openairdocs.org/ntsb-events/400); cases with it: [All aircraft, 1,127 cases](https://openairdocs.org/ntsb-events/400/sequence.md) - [Takeoff: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Takeoff: Dragged wing/rotor/float/other](https://openairdocs.org/ntsb-events/093); cases with it: [All aircraft, 319 cases](https://openairdocs.org/ntsb-events/093/sequence.md) ## Analysis The pilot reported that he performed a preflight inspection and then began to taxi the airplane from the seaplane base to the departure area. He reported encountering a heavy rain shower during taxi, with wind out of the south between 4-6 knots. The air traffic control tower cleared the pilot for a westbound departure; however, he elected to continue with a crosswind takeoff. The pilot applied left-wing-down aileron control inputs as he applied engine power. As the airplane accelerated, it began a drift to the left. The pilot reported that he was unable to stop the drift with the application of full right rudder, and that during this time he may have inadvertently relaxed the aileron control input. The pilot elected to abort the takeoff, and as he reduced engine power the right wing struck the water; the airplane incurred substantial damage to the wing spar and aileron during the impact sequence. The pilot reported no preimpact mechanical malfunction or failures. ## Factual narrative The pilot reported that he performed a preflight inspection, and then began to taxi the airplane from the seaplane base to the departure area. He reported encountering a heavy rain shower during taxi, with winds out of the south between 4-6 knots. The air traffic control tower cleared the pilot for a westbound departure, however, he elected to continue with a crosswind takeoff. The pilot applied left wing down aileron control inputs, as he applied engine power. As the airplane accelerated, it began a drift to the left. The pilot reported that he was unable to stop the drift with the application of full right rudder, and that during this time he may have inadvertently relaxed the aileron control input. The pilot elected to abort the takeoff, and as he reduced engine power the right wing struck the water, resulting in substantial damage to the wing spar and aileron. The pilot reported no mechanical malfunction or failures. ## Aircraft - Registration: N24150 (not matched to a registry record) - Reported make and model: DEHAVILLAND BEAVER DHC-2 MK.1 - Category: Airplane - Serial number: 1259 - Airframe hours: 5066 - Engines: P&W R-985 SERIES 450 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, October 22, 2009 - Departed: RNT, Renton, WA - Destination: RNT, Renton, WA - Flight plan: Unknown - Airport: W36, Will Rogers Wiley Post, runway 30, water ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 64; injuries: none; airline transport; airplane ratings: single-engine sea, multi-engine sea, single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review February 14, 2009; seat: left; flight hours: 12,437 total, 120 in this make and model, 6,620 as pilot in command, 3 in the last 90 days ## Weather - Conditions: Visual (VMC), Day - Wind: 190° at 6 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 66 °F, dew point 57 °F - Altimeter: 29.73 inHg - Observed at: RNT, 2 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 20100919044519A](https://openairdocs.org/incident/20100919044519A), Sep 19, 2010: Dehavilland BEAVER DHC-, Renton, WA, Substantial damage. During an attempted crosswind takeoff from the seaplane base, the pilot failed to maintain directional control and aborted. During the aborted takeoff the… ## Docket (2 files) The files NTSB released with the investigation on October 7, 2010, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=77342. 961 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 397 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40337490&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Photograph 1: Wing Damage (item 2, .PDF, 564 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40337491&FileExtension=.PDF&FileName=Photograph%201%3A%20Wing%20Damage-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.