# NTSB ENG11RA001: Boeing 747, Seoul, South Korea, October 10, 2010

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Foreign investigation
- Date: October 10, 2010
- Place: Seoul, South Korea
- Highest injury: No injuries
- Status: Led by another country's authority
- NTSB office: Aviation Engineering Division
- Lead agency: Other
- Parties: Pratt & Whitney, FAA
- NTSB case key (mKey): 77545
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ENG11RA001
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/77545/pdf
- Page: https://openairdocs.org/ntsb/ENG11RA001

## Factual narrative

On October 10, 2010, Korean Air Boeing 747-400 registered in Korea as HL7489, experienced an uncontained release of turbine material from the No. 3 engine, a Pratt & Whitney PW4056 engine. About 40 minutes after takeoff, the crew observed engine vibrations and oi pressure indications followed by high exhaust gas temperature. The crew shut down the No. 3 engine and returned to Seoul without further incident. The examination of the engine after landing showed the exhaust sleeve was missing and there was a large hole in the low pressure turbine case that revealed extensive internal damage to the engine. The airplane was operating as Korean Air flight KE023 from Seoul to San Francisco, California. There were no reported injuries to the passengers or crew. The incident is being investigated by the Korean Aviation & Railway Accident Investigation Board (ARAIB). The NTSB has designated a U.S. Accredited Representative to the ARAIB's investigation in accordance with the provisions of the International Civil Aviation Organization (ICAO) Annex 13 as the state of manufacture of the airplane and engine. All inquiries should be directed to: Aviation and Railway Accident Investigation Board Ministry of Land, Transport and Maritime Affairs 281, Gonghang-Dong Gangseo-gu, Seoul, 157-815 Republic of Korea Website: http://www.araib.go.kr

## Aircraft

- Registration: HL7489 (not matched to a registry record)
- Reported make and model: BOEING 747
- Engines: Pratt & Whitney PW4056 56000 lbs thrust turbo fan
- Damage: Minor damage
- Flight: Part 129
- Operator: Korean Air
- Registered owner: Korean Air
- Airworthiness certificate: Standard, Transport
- Departed: ICN, Seoul
- Destination: SFO, San Francisco, CA
- Flight plan: IFR
- Airport: ICN, Seoul International

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.