# NTSB GAA26WA143: Sikorsky S61, Cheonan, South Korea, March 24, 2026

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Class 5 · Foreign
- Date: March 24, 2026, 13:33 local (04:33 UTC)
- Place: Cheonan, South Korea
- Coordinates: 36.8915, 127.222
- Nearby events: https://openairdocs.org/map.md?lat=36.8915&lon=127.2220&mi=10
- Phase of flight: [Unknown](https://openairdocs.org/ntsb-phases/990) (OpenAirDocs' grouping)
- Defining event: [Unknown: Unknown or undetermined](https://openairdocs.org/ntsb-events/000)
- Highest injury: Serious injuries
- Injuries: 1 serious, 1 minor
- Status: Led by another country's authority
- Investigation class: Class 5 - No publish
- NTSB office: General Aviation Accidents
- Lead agency: Other
- NTSB case key (mKey): 202735
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=GAA26WA143
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/202735/pdf
- Page: https://openairdocs.org/ntsb/GAA26WA143

## Sequence of events

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

- [Unknown: Unknown or undetermined](https://openairdocs.org/ntsb-events/000) (defining event); cases with it: [All aircraft, 1,703 cases](https://openairdocs.org/ntsb-events/000/sequence.md)

## Aircraft

- Registration: HL9275 (not matched to a registry record)
- Reported make and model: SIKORSKY S61 (N)
- Category: Helicopter
- Damage: Destroyed
- Fire: Unknown
- Flight: Non-U.S., commercial

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.