# NTSB ANC22LA042: Short Bros. & Harland SC7, N731E, Chisana, AK, June 8, 2022

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Final report
- Date: June 7, 2022, 23:00 local (Jun 8, 2022, 07:00 UTC)
- Place: Chisana, AK
- Coordinates: 62.062794, -142.07527
- Nearby events: https://openairdocs.org/map.md?lat=62.0628&lon=-142.0753&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing-landing roll: Landing gear collapse](https://openairdocs.org/ntsb-events/094)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- Investigation class: Class 4 - Basic report with no Prelim publish
- NTSB office: Alaska Regional Office
- Parties: FAA
- NTSB case key (mKey): 105265
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC22LA042
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/105265/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=105265
- Page: https://openairdocs.org/ntsb/ANC22LA042

## Probable cause

The pilot’s selection of an unsuitable landing site, which resulted in the nosewheel collapsing.

## Findings

NTSB's coded findings; those marked are part of the probable cause.

- [Info processing/decision: decision making/judgment](https://openairdocs.org/ntsb-findings/02041520): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Short Bros. & Harland SC7 SERIES 3, 1 case](https://openairdocs.org/ntsb-findings/02041520/cases.md?model=8100512), [All aircraft, 3,098 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md)
- [Terrain: wet/muddy terrain](https://openairdocs.org/ntsb-findings/03021035): Environmental issues › Physical environment · Contributed to outcome; cases with it: [Short Bros. & Harland SC7 SERIES 3, 1 case](https://openairdocs.org/ntsb-findings/03021035/cases.md?model=8100512), [All aircraft, 110 cases](https://openairdocs.org/ntsb-findings/03021035/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: Landing gear collapse](https://openairdocs.org/ntsb-events/094) (defining event); 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 of a twin-engine, turbine-powered airplane was landing at a remote, rough, soft, turf and grass covered airstrip at the completion of a Part 135 cargo flight. He said that after an uneventful touchdown, as the airplane’s landing roll slowed, the right main landing gear wheel and the nose wheel contacted an area of soft, muddy terrain. The airplane’s nose wheel collapsed, and it subsequently folded under the fuselage. The airplane sustained substantial damage to the fuselage. The pilot reported no mechanical problems that would have precluded normal operations.

## Aircraft

- Registration: [N731E](https://openairdocs.org/aircraft/N731E), registered now, S/N SH-1853, built 1968 (OpenAirDocs)
- Reported make and model: SHORT BROS. & HARLAND SC7
- Registry model: [Short Bros. & Harland SC7 SERIES 3](https://openairdocs.org/model/short-bros-harland-sc7-series-3) (registry code 8100512) (OpenAirDocs)
- Registry engine: [AiResearch TPE331 series](https://openairdocs.org/engine/airesearch-tpe331-series) (registry code 01514, turbo-prop) (OpenAirDocs)
- Category: Airplane
- Serial number: SH-1853
- Year built: 1968
- Engines: Garrett TPE-331-2 715 hp turbo prop; Garrett TPE-331-2 715 horsepower turbo prop
- Damage: Substantial damage
- Flight: Business, Part 135
- Operator: Viking Air LLC, doing business as Alaskan Air Charter LLC
- Registered owner: Alaskan Air Charter LLC
- Airworthiness certificate: Standard, Normal
- Last inspection: AAIP, June 6, 2022, 12 hours before
- Departed: PAOR, Northway, AK
- Destination: Same as departure
- Flight plan: Company VFR
- Airport: CZN, Chisana Airport, runway 12, 3,000 × 50 ft, grass/turf

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 65; injuries: none; airline transport; airplane ratings: multi-engine land, single-engine land, single-engine sea; instrument ratings: helicopter, airplane; medical: class 2; last flight review June 2, 2021; seat: left; restraint: 4-point; flight hours: 2,700 total, 600 in this make and model, 2,350 as pilot in command, 75 in the last 90 days, 75 in the last 30 days, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Dusk
- Wind: calm
- Lowest ceiling: none

## 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 20220607007089A](https://openairdocs.org/incident/20220607007089A), Jun 7, 2022: Short Bros. & Harland SC7 SERIES 3, Chisana, AK, Substantial damage. During landing roll, after all landing gear was on the ground, the nose wheel encountered a soft spot on the runway. The nose gear collapsed appx. 100' after…

## Docket (2 files)

The files NTSB released with the investigation on April 20, 2023, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=105265. 2.4 MB in all.

- Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 12 pages, 779 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15308178&FileExtension=pdf&FileName=Point%20One_Redacted-Rel.pdf
- Photos (item 2, PDF, 3 pages, 1.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15307393&FileExtension=pdf&FileName=Photo%20Array-Rel.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.

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