# NTSB WPR13LA307: Boson RV-4, N220CP, Hurricane, UT, July 3, 2013 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: July 3, 2013, 17:15 local (23:15 UTC) - Place: Hurricane, UT - Coordinates: 37.1375, -113.303611 - Nearby events: https://openairdocs.org/map.md?lat=37.1375&lon=-113.3036&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Runway excursion](https://openairdocs.org/ntsb-events/300) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report July 30, 2014 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 87386 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR13LA307 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/87386/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=87386 - Page: https://openairdocs.org/ntsb/WPR13LA307 ## Probable cause The pilot’s incorrect approach/descent path with a tailwind, which resulted in a long landing at an excessive groundspeed and a subsequent runway excursion. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Boson Charles P RV-4, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=05623BB), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Wind: tailwind](https://openairdocs.org/ntsb-findings/03034015): Environmental issues › Conditions/weather/phenomena · Effect on equipment; cases with it: [Boson Charles P RV-4, 1 case](https://openairdocs.org/ntsb-findings/03034015/cases.md?model=05623BB), [All aircraft, 594 cases](https://openairdocs.org/ntsb-findings/03034015/cases.md) - [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: [Boson Charles P RV-4, 1 case](https://openairdocs.org/ntsb-findings/01062045/cases.md?model=05623BB), [All aircraft, 238 cases](https://openairdocs.org/ntsb-findings/01062045/cases.md) - [Performance/control parameters: descent/approach/glide path](https://openairdocs.org/ntsb-findings/01062040): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Boson Charles P RV-4, 1 case](https://openairdocs.org/ntsb-findings/01062040/cases.md?model=05623BB), [All aircraft, 809 cases](https://openairdocs.org/ntsb-findings/01062040/cases.md) - [Terrain: sloped/uneven terrain](https://openairdocs.org/ntsb-findings/03021017): Environmental issues › Physical environment · Contributed to outcome; cases with it: [Boson Charles P RV-4, 1 case](https://openairdocs.org/ntsb-findings/03021017/cases.md?model=05623BB), [All aircraft, 270 cases](https://openairdocs.org/ntsb-findings/03021017/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: Runway excursion](https://openairdocs.org/ntsb-events/300) (defining event); cases with it: [Boson Charles P RV-4, 1 case](https://openairdocs.org/ntsb-events/300/sequence.md?model=05623BB), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) - [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Boson Charles P RV-4, 1 case](https://openairdocs.org/ntsb-events/470/sequence.md?model=05623BB), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis During the landing with a tailwind, the airplane departed the runway and came to rest in a ravine about 100 yards from the departure end of the runway. The pilot did not recall the circumstances leading to the accident. Two witnesses reported that the airplane landed long. One witness further stated that the engine sounded normal and that the airplane was moving at a high rate of speed after touchdown. Postaccident examination of the airplane and engine revealed no evidence of mechanical malfunctions or failures that would have precluded normal operation. ## Factual narrative On July 3, 2013, about 1715 mountain daylight time, an experimental amateur built Boson, RV-4, N220CP, sustained substantial damage from a runway overrun during landing roll, at the General Dick Stout Field Airport (1L8) Hurricane, Utah. The airplane was registered to and operated by the pilot under the provisions of Title 14 Code of Federal Regulations Part 91. The private pilot was seriously injured. Visual meteorological conditions prevailed and no flight plan was filed for the personal flight which originated from Cedar City Regional Airport (CDC) Cedar City, Utah, about 1630, with a destination of 1L8. In a written statement to the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) the pilot reported that he did not recall the circumstances of the accident. Two witnesses located near the airport runway reported that the airplane landed long and then departed the runway surface at the end of runway 19. The airplane came to rest in a ravine about 100 yards from the departure end of the runway. One witness stated that the airplane's engine noise was normal and the airplane was moving at a high rate of speed upon landing. Examination of the accident site was conducted by a Federal Aviation Administration inspector, who was able to obtain flight control and engine continuity and reported no anomalies. The airplane's fuselage and wings sustained substantial damage. A review of recorded weather data from the CDC automated weather observation station revealed at 1653 conditions were wind 320 degrees at 8 knots. Postaccident examination of the airplane and engine was conducted by a certified airframe and powerplant mechanic, under the supervision of the NTSB IIC investigator-in-charge. Flight control continuity was established throughout all primary flight control surfaces from the cockpit controls. Braking continuity was established and the brakes and tires were unremarkable. An engine run was accomplished using an external fuel source that was connected directly to the carburetor fuel port. An external battery was used to start the engine. The engine functioned normally throughout a various range of power settings and no anomalies were noted. The examination of the airplane and engine revealed no evidence of mechanical anomalies or failures that would have precluded normal operation. For additional information, see the Airframe and Engine Examination Report in the Public docket. ## Aircraft - Registration: [N220CP](https://openairdocs.org/deregistered/N220CP-2017-09-18), registration cancelled 2017-09-18, S/N 2214, built 1993 (OpenAirDocs) - Reported make and model: BOSON RV-4 - Registry model: [Boson Charles P RV-4](https://openairdocs.org/model/boson-charles-p-rv-4) (registry code 05623BB) (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: 2214 - Year built: 1993 - Engines: LYCOMING O-320 SERIES 180 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Spey John R Major Usaf (Ret) - Registered owner: Spey John R Major Usaf (Ret) - Airworthiness certificate: Special, Experimental (Special) - Departed: CDC, Cedar City, UT - Destination: 1L8, Hurricane, UT - Airport: 1L8, General Dick Stout Field, runway 19, 3,282 × 40 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 74; injuries: serious; private, military; airplane ratings: single-engine land; medical: class 3, without waivers/limitations; seat: front; restraint: 3-point; flight hours: 6,800 total ## Weather - Conditions: Visual (VMC), Day - Wind: 320° at 8 knots - Visibility: 10 statute miles - Temperature: 99 °F, dew point 28 °F - Altimeter: 30.01 inHg - Observed at: CDC, 35 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 20130703011789A](https://openairdocs.org/incident/20130703011789A), Jul 3, 2013: Boson Charles P RV-4, Hurricane, UT, Substantial damage. The aircraft was based at and returning to Hurricane, Utah (1L8) from cedar city, Utah (cdc). The aircraft landed long of runway 19. There were skid marks… ## Docket (8 files) The files NTSB released with the investigation on June 5, 2014, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=87386. 2.8 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 1.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413059&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - City of Hurricane Police Department - Witness Statement - Josh Lee (item 2, .PDF, 268 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413060&FileExtension=.PDF&FileName=City%20of%20Hurricane%20Police%20Department%20-%20Witness%20Statement%20-%20Josh%20Lee-Redacted.PDF - City of Hurricane Police Department - Witness Statement - Kelby Iverson (item 3, .PDF, 271 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413061&FileExtension=.PDF&FileName=City%20of%20Hurricane%20Police%20Department%20-%20Witness%20Statement%20-%20Kelby%20Iverson-Redacted.PDF - Record of Conversation (Josh Lee) (item 4, .PDF, 89 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413062&FileExtension=.PDF&FileName=Record%20of%20Conversation%20(Josh%20Lee)-Master.PDF - Record of Conversation (Kelby Iverson) (item 5, .PDF, 93 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413063&FileExtension=.PDF&FileName=Record%20of%20Conversation%20(Kelby%20Iverson)-Master.PDF - NTSB Airframe and Engine Examination Report (item 6, .PDF, 166 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413064&FileExtension=.PDF&FileName=NTSB%20Airframe%20and%20Engine%20Examination%20Report-Redacted.PDF - Engine Run Video (item 7, .PDF, 57 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413065&FileExtension=.PDF&FileName=Engine%20Run%20Video-Master.PDF - Retention/Release of Wreckage, NTSB Form 6120.15 (item 8, .PDF, 214 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413066&FileExtension=.PDF&FileName=Retention%2FRelease%20of%20Wreckage,%20NTSB%20Form%206120.15%20-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.