# NTSB ANC12LA068: Shorey Timothy A Preceptor Stol King, N919WP, North Pole, AK, July 7, 2012 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: July 7, 2012, 09:20 local (17:20 UTC) - Place: North Pole, AK - Coordinates: 64.818054, -147.53778 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=64.8181&lon=-147.5378&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Defining event: [Enroute-cruise: Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report January 22, 2013 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - Parties: Federal Aviation Administration - NTSB case key (mKey): 84229 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC12LA068 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/84229/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=84229 - Page: https://openairdocs.org/ntsb/ANC12LA068 ## Probable cause A total loss of engine power due to a binding drive belt while in the airport traffic pattern. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Power plant](https://openairdocs.org/ntsb-findings/01057100): Aircraft › Aircraft power plant · Failure (probable cause); cases with it: [All aircraft, 198 cases](https://openairdocs.org/ntsb-findings/01057100/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Enroute-cruise: Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342) (defining event); cases with it: [All aircraft, 1,858 cases](https://openairdocs.org/ntsb-events/342/sequence.md) - [Enroute-cruise: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341); cases with it: [All aircraft, 3,820 cases](https://openairdocs.org/ntsb-events/341/sequence.md) - [Emergency descent: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot reported that she was on a postproduction check flight of a recently completed experimental homebuilt airplane. She said that while on the downwind leg in the traffic pattern, the engine sputtered, the cylinder head and exhaust gas temperatures began to rise, and the engine lost power. During the subsequent emergency descent, the airplane struck a power pole and power lines, and then flipped and impacted the ground tail first. Postaccident examination of the engine revealed that one of the two drive belts for the gear reduction drive had fallen off of the pulley and showed evidence of binding. ## Factual narrative On July 7, 2012, about 0920 Alaska daylight time, a homebuilt experimental Preceptor STOL King airplane, N919WP, sustained substantial damage during a forced landing, following a loss of engine power while in the traffic pattern at Lakloey Air Park, North Pole, Alaska. The airplane was being operated by the pilot as a visual flight rules (VFR) personal flight, under 14 Code of Federal Regulations Part 91, when the accident occurred. The certificated private pilot was not injured. Visual meteorological conditions prevailed, and no flight plan was filed. During an on-scene interview with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) on July 7, the pilot stated this was the second test flight since the aircraft was completed. She had departed Lakloey Air Park, and was staying in the traffic pattern. On the downwind leg, the engine sputtered, cylinder head and exhaust gas temperatures began to rise, and the engine lost power. During the emergency descent, the airplane struck a power pole, hit power lines, and impacted the ground tail first. The airplane sustained substantial damage to the empennage and wings. The examination of the engine, by the NTSB IIC, revealed one of the two drive belts for the gear reduction drive had fallen off the pulley, and showed evidence of binding. ## Aircraft - Registration: N919WP (not matched to a registry record) - Reported make and model: SHOREY TIMOTHY A PRECEPTOR STOL KING - Category: Airplane, amateur-built - Serial number: 001 - Airframe hours: 7 - Engines: Timothy A Shorey 019440104REDK 103 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Shorey Ruby Mae - Registered owner: Shorey Timothy Andrew - Airworthiness certificate: Special, Experimental (Special) - Last inspection: July 6, 2012 - Departed: AK22, North Pole, AK - Destination: AK22, North Pole, AK - Airport: AK22, Lakloey Air Park ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 45; injuries: none; private; airplane ratings: single-engine land; medical: class 3, without waivers/limitations; last flight review July 11, 2011; seat: front; flight hours: 251 total, 7 in this make and model, 160 as pilot in command, 20 in the last 90 days, 15 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 61 °F ## 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 20120707013479A](https://openairdocs.org/incident/20120707013479A), Jul 7, 2012: Shorey Timothy A PRECEPTOR STOL KING, Fairbanks, AK, Substantial damage. 7/7/2012AIRCRAFT was on landing approach and engine lost power. Aircraft hit powerlines and crashed to ground. Reduction drive belt came partially off pulley… ## Docket (1 files) The files NTSB released with the investigation on November 9, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=84229. 2.8 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 2.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40381398&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.