# NTSB LAX92WA091: Boeing 747-100, N4729U, Narita, Japan, January 9, 1992

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Foreign investigation
- Date: January 9, 1992
- Place: Narita, Japan
- Highest injury: Serious injuries
- Injuries: 1 serious, 234 uninjured
- Status: Led by another country's authority
- NTSB case key (mKey): 27800
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX92WA091
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/27800/pdf
- Page: https://openairdocs.org/ntsb/LAX92WA091

## Aircraft

- Registration: [N4729U](https://openairdocs.org/deregistered/N4729U-1998-05-29), registration cancelled 1998-05-29, S/N 19926 (OpenAirDocs)
- Reported make and model: BOEING 747-100
- Registry model: [Boeing 747-122](https://openairdocs.org/model/boeing-747-122) (registry code 1384872) (OpenAirDocs)
- Category: Airplane
- Damage: No damage
- Flight: Part 121
- Operator: United Airlines
- Airworthiness certificate: Standard, Transport
- Departed: RNRT, NARITA,JAPAN, OF
- Destination: SFO, SAN FRANCISCO, CA
- Flight plan: IFR

## Weather

- Conditions: Visual (VMC), Night/dark

## 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 19920109040689I](https://openairdocs.org/incident/19920109040689I), Jan 9, 1992: Boeing 747122, Tokyo, JA. Encountered unexpected severe turbulence. Passenger in aisle at lavatory broke leg. Refused return seat. Belt light

## Other investigations on N4729U (2)

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.

- [NTSB BFO93WA148](https://openairdocs.org/ntsb/BFO93WA148), Aug 27, 1993: Boeing 747-100 (N4729U), Milan, Italy, incident, no damage
- [NTSB CHI86FA096](https://openairdocs.org/ntsb/CHI86FA096), Mar 4, 1986: Boeing 747-122 (N4729U), Honolulu, HI, no damage

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.