# Incident 19990224021159I: Boeing 747251B, Tokyo, JA, February 24, 1999

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: February 24, 1999, 03:55 local time
- Place: Tokyo, JA
- Airport: New Tokyo International-Narita
- Damage: Minor damage
- Phase of flight: Ground Taxi, Other Airplane
- Operating rules: Air carrier (Part 121)
- Operator: NWAA
- Aircraft: N622US, a cancelled registration (https://openairdocs.org/deregistered/N622US-2008-11-24) (OpenAirDocs)
- Registry model: Boeing 747-251B (registry code 1384892, https://openairdocs.org/model/boeing-747-251b) (OpenAirDocs)
- Registry engine: Amateur-built UNKNOWN ENG (registry code 99999, https://openairdocs.org/engine/amateur-built-unknown-eng) (OpenAirDocs)
- Reported make and model: BOEING 747251B
- Reported engine: PWA JT9D7Q
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19990224021159I

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

AFTER LANDING AND RUNWAY TURN OFF AT NRT A LOUD POP AND HISSING SOUND WAS HEARD. THE SECOND OFFICER OBSERVED FIRE UNDER HIS TABLE.  HE QUICKLY EXTINGUISHED THE FIRE USING A HALON BOTTLE.  DURING FLIGHT THE 32 GENERATOR FIELD RELAY AND GENERATOR BREAKER OPENED, PRESSURIZATION SYSTEM AUTO-FAIL LIGHT ILLUMINATED AND THE 32 ENGINE N1 GAUGE FAILED.  DISCONNECTED 32 CSD, RESET PRESSURIZATION SYSTEM AND N1 INDICATOR CAME BACK.  PRELIMINARY SHOP TEARDOWN REVEALED THE #2 T/R BURNT.  THE ADJACENT #3 T/R HAD AN INTERNAL DUST BUILD-UP OF APPROX. 1/2".  PRELIMINARY ENGINEERING ANALYSIS SUSPECTS THE VOLTAGE TRANSIENT FROM THE GENERATOR TRIP CAUSED THE FILTER CAPACITORS TO EXPLODE GENERATING SUFFICIENT HEAT TO IGNITE DUST BUILD-UP.

## Other reports on N622US (1)

Matched to the same aircraft by N-number and date.

- [Incident 19791001051489I](https://openairdocs.org/incident/19791001051489I), Oct 1, 1979: Boeing 747/ (N622US), Prestwick, UK, Substantial damage. Three of four engines damaged by bird strike after takeoff.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

---
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.