# Incident 19910107006539I: Doug DC981, Williamsport, PA, January 7, 1991

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: January 7, 1991, 14:01 local time
- Place: Williamsport, PA
- Phase of flight: Normal Cruise
- Operating rules: Air carrier (Part 121)
- Operator: USAA
- Location: 41.2400° N, 77.0356° W: Placed by OpenAirDocs: center of Williamsport, PA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.2400&lon=-77.0356&mi=10
- Aircraft: N805US, a cancelled registration (https://openairdocs.org/deregistered/N805US-2005-05-20) (OpenAirDocs)
- Registry model: Mcdonnell Douglas DC-9-81(MD-81) (registry code 3022081, https://openairdocs.org/model/mcdonnell-douglas-dc-9-81-md-81) (OpenAirDocs)
- Registry engine: Pratt & Whitney JT8D-9 series (registry code 52048, https://openairdocs.org/engine/pratt-whitney-jt8d-9-series) (OpenAirDocs)
- Reported make and model: DOUG DC981
- People aboard: 79
- Fatal injuries: 0
- Pilot flight hours: 20,909 total, 765 in this make and model, 102 in the last 90 days
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19910107006539I

## Narrative

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

AIRCRAFT DEVIATED FROM ASSIGNED ALTITUDE WHEN THE T-CAS MALFUNCTIONED. CREW WAS ALTERTED BY THE CABIN ALERT SYSTEM.

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.

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