# NTSB WPR27LA011: Enstrom Helicopter 480, N480MT, Chelan, WA, September 30, 2026

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Investigation open
- Date: September 30, 2026, 09:00 local (16:00 UTC)
- Place: Chelan, WA
- Location: 47.8443° N, 120.0136° W: Placed by OpenAirDocs: center of Chelan, WA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=47.8443&lon=-120.0136&mi=10
- Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping)
- Defining event: [Standing: Miscellaneous/other](https://openairdocs.org/ntsb-events/900)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Investigation ongoing
- Investigation class: Class 4 - Basic report with no Prelim publish
- NTSB office: Western Pacific Region
- NTSB case key (mKey): 203961
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR27LA011
- Latest NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/203961/pdf
- Page: https://openairdocs.org/ntsb/WPR27LA011

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Standing: Miscellaneous/other](https://openairdocs.org/ntsb-events/900) (defining event); cases with it: [Enstrom Helicopter 480, 1 case](https://openairdocs.org/ntsb-events/900/sequence.md?model=3300560), [All aircraft, 1,558 cases](https://openairdocs.org/ntsb-events/900/sequence.md)

## Aircraft

- Registration: [N480MT](https://openairdocs.org/aircraft/N480MT), registered now, S/N 5003, built 1994 (OpenAirDocs)
- Reported make and model: ENSTROM HELICOPTER CORP 480
- Registry model: [Enstrom Helicopter 480](https://openairdocs.org/model/enstrom-helicopter-480) (registry code 3300560) (OpenAirDocs)
- Registry engine: [Allison 250 series](https://openairdocs.org/engine/allison-250-series) (registry code 03019, reciprocating) (OpenAirDocs)
- Flight: Business
- Operator: Cline Air Services LLC
- Registered owner: Cline Air Services LLC

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Incident 20260930013249I](https://openairdocs.org/incident/20260930013249I), Sep 30, 2026: Enstrom Helicopter Corp 480, Chelan, WA, Substantial damage. Aircraft was idling on an inclined logging road and slid on the road into side of a hill on the ground damaging tail rotor and boom.

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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