# NTSB ANC09CA109: Short Bros. & Harland SC7 Series, N754BD, Skwentna, AK, September 26, 2009 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: September 26, 2009, 11:00 local (19:00 UTC) - Place: Skwentna, AK - Coordinates: 62.084167, -152.717498 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=62.0842&lon=-152.7175&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report March 3, 2010 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - NTSB case key (mKey): 74817 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC09CA109 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/74817/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=74817 - Page: https://openairdocs.org/ntsb/ANC09CA109 ## Probable cause The pilot's failure to maintain directional control while landing on a rough, soft, and narrow airstrip. ## 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: [Short Bros. & Harland SC7 SERIES 3, 1 case](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=8100512), [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: [Short Bros. & Harland SC7 SERIES 3, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=8100512), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Runway/land/takeoff/taxi surface: soft surface](https://openairdocs.org/ntsb-findings/03023020): Environmental issues › Physical environment · Contributed to outcome; cases with it: [Short Bros. & Harland SC7 SERIES 3, 1 case](https://openairdocs.org/ntsb-findings/03023020/cases.md?model=8100512), [All aircraft, 264 cases](https://openairdocs.org/ntsb-findings/03023020/cases.md) - [Experience/qualifications: total experience w/ equipment](https://openairdocs.org/ntsb-findings/02031025): Personnel issues › Experience/knowledge · Pilot; cases with it: [Short Bros. & Harland SC7 SERIES 3, 1 case](https://openairdocs.org/ntsb-findings/02031025/cases.md?model=8100512), [All aircraft, 269 cases](https://openairdocs.org/ntsb-findings/02031025/cases.md) - [Runway/land/takeoff/taxi surface: soft surface](https://openairdocs.org/ntsb-findings/03023020): Environmental issues › Physical environment · Effect on operation; cases with it: [Short Bros. & Harland SC7 SERIES 3, 1 case](https://openairdocs.org/ntsb-findings/03023020/cases.md?model=8100512), [All aircraft, 264 cases](https://openairdocs.org/ntsb-findings/03023020/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: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Short Bros. & Harland SC7 SERIES 3, 1 case](https://openairdocs.org/ntsb-events/230/sequence.md?model=8100512), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Landing gear collapse](https://openairdocs.org/ntsb-events/094); cases with it: [Short Bros. & Harland SC7 SERIES 3, 2 cases](https://openairdocs.org/ntsb-events/094/sequence.md?model=8100512), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) ## Analysis The pilot reported that he was taking cargo to a remote mining airstrip when, during the landing roll, the main landing gear wheels encountered several soft spots and he had difficulty maintaining directional control. The nosewheel encountered rough and soft terrain near the edge of the airstrip and collapsed rearward, damaging a fuselage structural bulkhead. The pilot stated that there was no preaccident mechanical problems with the airplane and that it would have been beneficial to have a wider runway and more experience in that type of airplane. ## Factual narrative The airline transport pilot reported that he was taking cargo to a remote mining airstrip under the provisions of Title 14, Code of Federal Regulations Part 91. He said during the landing roll, the main landing gear wheels encountered several soft spots, and he had difficulty maintaining directional control. The nose wheel encountered rough and soft terrain near the edge of the airstrip and collapsed rearward, damaging a fuselage structural bulkhead. The pilot stated that there was no preaccident mechanical problems with the airplane, and that in retrospect, it would have been beneficial to have a wider runway and more experience in that type airplane. ## Aircraft - Registration: [N754BD](https://openairdocs.org/aircraft/N754BD), registered now, S/N SH1907, built 1973 (OpenAirDocs) - Reported make and model: SHORT BROS. & HARLAND SC7 SERIES - Registry model: [Short Bros. & Harland SC7 SERIES 3](https://openairdocs.org/model/short-bros-harland-sc7-series-3) (registry code 8100512) (OpenAirDocs) - Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs) - Category: Airplane - Serial number: SH1907 - Engines: AMA/EXPR UNKNOWN ENG turbo prop; Garrett TPE-331 turbo prop - Damage: Substantial damage - Flight: Other work use, Part 91 - Operator: All West Freight Inc - Registered owner: All West Freight Inc - Airworthiness certificate: Standard, Normal - Departed: 40AK, Sterling, AK - Destination: 6AK, Skwentna, AK - Flight plan: Unknown - Airport: 6AK, Rainy Pass Lodge, runway 29 ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 57; injuries: none; airline transport; airplane ratings: multi-engine land, single-engine sea, single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; seat: left; flight hours: 22,500 total, 30 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: variable at 15 knots, gusting 18 - Observed at: 6AK, 1 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 20090926049799A](https://openairdocs.org/incident/20090926049799A), Sep 26, 2009: Short Bros. SC7 SERIES, Puntilla Lake, AK, Substantial damage. The pilot stated that he was landing N754BD on runway 29 at Puntilla Lake, on Saturday morning at around 11:00 am. During the landing roll, about 1500 feet… ## Docket (1 files) The files NTSB released with the investigation on November 13, 2009, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=74817. 776 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 776 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40321233&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.