# NTSB investigations: Pratt & Whitney JT9D-3A, AK

NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports.

## Latest cases

- [NTSB ANC05IA020](https://openairdocs.org/ntsb/ANC05IA020.md): Boeing 747-123 · Anchorage, AK · Incident · No injuries · Incident investigation · Final report · Dec 29, 2004 · N858FT · Minor damage
  > The failure of a high-pressure fuel line fitting, which resulted in an engine fire during takeoff/initial climb.
- [NTSB ANC99IA025](https://openairdocs.org/ntsb/ANC99IA025.md): Boeing 747-100 · Fairbanks, AK · Incident · No injuries · Incident investigation · Final report · Jan 19, 1999 · N481EV · Minor damage
  > The improper overhaul of the thrust reverser pneumatic drive unit, and the subsequent failure of the thrust reverser actuator. Factors associated with the incident were the inadequate quality assurance procedures by the overhaul company.
- [NTSB DCA93MA033](https://openairdocs.org/ntsb/DCA93MA033.md): Boeing 747-121 · Anchorage, AK · Accident · No injuries · Class 1 · Major · Final report · Mar 31, 1993 · N473EV · Substantial damage
  > The lateral separation of the no. 2 engine pylon due to an encounter with severe or possibly extreme turbulence that resulted in dynamic multi-axis lateral loadings that exceeded the ultimate lateral load-carrying capability of the pylon, which was already…

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
SELECT c."ntsbNumber", c."eventDate", c."eventType", c."eventCity", c."eventStateOrRegion", a.n_number, a."aircraftMake", a."aircraftModel", c."highestInjuryLevel", c."totalFatal", c."completionStatus", c.report_url
FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = c."mKey" AND a.position = 1
WHERE c."eventStateOrRegion" = 'AK' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('52050'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=52050&state=AK

---
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.