# NTSB WPR12LA225: Waggonner Excalibur, N165AW, Buhl, ID, May 22, 2012 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: May 22, 2012, 16:40 local (22:40 UTC) - Place: Buhl, ID - Coordinates: 42.591388, -114.796669 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=42.5914&lon=-114.7967&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Defining event: [Approach-VFR pattern final: Loss of control in flight](https://openairdocs.org/ntsb-events/240) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report October 15, 2012 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 83753 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR12LA225 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/83753/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=83753 - Page: https://openairdocs.org/ntsb/WPR12LA225 ## Probable cause The pilot’s failure to maintain control of the airplane while on final approach, which resulted in an aerodynamic stall. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Performance/control parameters: airspeed](https://openairdocs.org/ntsb-findings/01062010): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Waggonner Jack H EXCALIBUR, 1 case](https://openairdocs.org/ntsb-findings/01062010/cases.md?model=056261Y), [All aircraft, 1,681 cases](https://openairdocs.org/ntsb-findings/01062010/cases.md) - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Waggonner Jack H EXCALIBUR, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=056261Y), [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. - [Approach-VFR pattern final: Loss of control in flight](https://openairdocs.org/ntsb-events/240) (defining event); cases with it: [Waggonner Jack H EXCALIBUR, 1 case](https://openairdocs.org/ntsb-events/240/sequence.md?model=056261Y), [All aircraft, 5,002 cases](https://openairdocs.org/ntsb-events/240/sequence.md) - [Uncontrolled descent: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Waggonner Jack H EXCALIBUR, 1 case](https://openairdocs.org/ntsb-events/470/sequence.md?model=056261Y), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis During his first time operating the newly-assembled airplane, the pilot/airplane builder performed a series of high-speed taxi tests on the taxiway. The pilot stated that, after traversing the length of the taxiway several times, the airplane became airborne in the gusty wind. The pilot increased the engine power, and the airplane continued to ascend. He maneuvered near the airport for about 10 minutes and then decided to return. While on final approach to the runway, the airplane was unstable, and the pilot performed a go-around. On the second approach, with the airplane about 30 feet above ground level, the pilot lost control, and the airplane descended in a nose-low attitude into the terrain. The pilot reported no mechanical malfunctions or failures with the airplane that would have precluded normal operation. About the time of the accident, the wind was reported to be at 9 knots, gusting to 19 knots. ## Factual narrative On May 22, 2012, about 1640 mountain daylight time, a Waggonner Excalibur, N165AW, collided with terrain during an approach to the runway at the Buhl Municipal Airport, Buhl, Idaho. The owner was operating the airplane under the provisions of 14 Code of Federal Regulations (CFR) Part 91. The private pilot, the sole occupant, sustained serious injuries; the airplane sustained substantial damage. The local personal flight departed from Buhl about 1630. Visual meteorological conditions prevailed, and no flight plan had been filed. In a written statement, the pilot reported that he arrived at the airport earlier in the morning and assembled the airplane; he had never flown it prior. After the fuel pump was replaced, he had an Airframe and Powerplant mechanic examine the airplane and received verbal confirmation from him that it was in airworthy condition. The mechanic did not sign the airplane’s logbooks due to inadequate records from the previous owner. The pilot then taxied the airplane for about an hour. The pilot further stated that during taxi, a gust of wind lifted the airplane airborne and he decided to add engine power. He maneuvered the airplane for about 10 minutes and decided to return to the airport. The first approach to the runway was unsatisfactory and he performed a go-around. On the second approach, with the airplane about 30 feet above ground level (agl), he experienced a loss of control and the airplane dove in a nose-low attitude into terrain. He was transported to a nearby hospital. The pilot reported no mechanical malfunctions or failures with the airplane that would have precluded normal operation. According to witnesses, the pilot was performing a series of high speed taxi tests on the parallel taxiway located south of the runway. After several times of traversing the length of the taxiway, the airplane taxied onto the active runway at the midfield point. The airplane then accelerated down the runway and became airborne in the gusty winds. The witnesses heard the engine power increase and the airplane continued to ascend. The airplane maneuvered near the airport for about 10 minutes and then approached back to the runway. While on final approach, the airplane appeared unstable and the pilot performed a go-around. The witnesses further stated that the airplane made several turns and the pilot appeared to be attempting to return back to the runway. With the airplane about 20 feet agl, the airplane stalled and descended into the terrain. The airplane came to rest near the approach end of runway 27 with the engine still running. A routine aviation weather report (METAR) generated by an Automated Surface Observation System (ASOS) at Magic Valley Regional Airport, Twin Falls, Idaho (located 15.5 nautical miles west from the accident site), indicated that about 15 minutes after the accident the wind was variable from 260 to 330 degrees at 9 knots with wind gusts at 19 knots. ## Aircraft - Registration: [N165AW](https://openairdocs.org/deregistered/N165AW-2015-05-20), registration cancelled 2015-05-20, S/N 001, built 2010 (OpenAirDocs) - Reported make and model: WAGGONNER EXCALIBUR - Registry model: [Waggonner Jack H EXCALIBUR](https://openairdocs.org/model/waggonner-jack-h-excalibur) (registry code 056261Y) (OpenAirDocs) - Registry engine: [Rotax 582DCDI](https://openairdocs.org/engine/rotax-582dcdi) (registry code 55562, 2 cycle) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: 001 - Engines: ROTAX 582DCDI 65 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Special, Experimental light sport (Special) - Last inspection: Condition, May 22, 2012, 0 hours before - Departed: U03, Buhl, ID - Destination: U03, Buhl, ID - Airport: U03, Buhl Municipal Airport, runway 27, 3,900 × 60 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 65; injuries: serious; private; airplane ratings: single-engine land; medical: class 3, with waivers/limitations; last flight review September 26, 2011; seat: front; flight hours: 290 total, 86 as pilot in command, 7 in the last 90 days ## Weather - Conditions: Visual (VMC), Day - Wind: 300° at 9 knots, gusting 19 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 72 °F, dew point 34 °F - Altimeter: 29.86 inHg - Observed at: TWF, 15 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 20120522009519A](https://openairdocs.org/incident/20120522009519A), May 22, 2012: Waggonner Jack H EXCALIBUR, Buhl, ID, Substantial damage. On may 22, 2012, about 1640 mountain daylight time, a Waggonner Excalibur, N165AW, collided with terrain during an approach to the runway at the Buhl Municipal… ## Docket (1 files) The files NTSB released with the investigation on August 8, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=83753. 2.1 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 2.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40374006&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-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.