# Incident 19960119002799I: Boeing 737300, Pittsburgh, PA, January 19, 1996

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: January 19, 1996, 10:33 local time
- Place: Pittsburgh, PA
- Airport: Greater Pittsburgh International
- Phase of flight: Normal Cruise
- Operating rules: Air carrier (Part 121)
- Operator: USAA
- Location: 40.4406° N, 79.9959° W: Placed by OpenAirDocs: center of Pittsburgh, PA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=40.4406&lon=-79.9959&mi=10
- Aircraft: N520AU, a cancelled registration (https://openairdocs.org/deregistered/N520AU-2007-11-30) (OpenAirDocs)
- Registry model: Boeing 737-3B7 (registry code 138447F, https://openairdocs.org/model/boeing-737-3b7) (OpenAirDocs)
- Registry engine: CFM International CFM56 series (registry code 13802, https://openairdocs.org/engine/cfm-international-cfm56-series) (OpenAirDocs)
- Reported make and model: BOEING 737300
- People aboard: 39
- Fatal injuries: 0
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19960119002799I

## Narrative

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

NARRATIVE: WHILE IN CRUISE FLIGHT AT 37,000 FT., CABIN BEGAN TO CLIMB AT 2000 FT/MIN. PILOTS NOTED THAT L. DUCT PRESSURE WAS 42 PSI ON L. ENGINE EGT WAS 754 DEGREES, RIGHT DUCT PRESSURE WAS 12 PSI AND R. ENGINE EGT WAS 663 DEGREES. ATTEMPTS TO CONTROL PRESSURIZATION FAILED. THE LEFT AIR PACK TRIPPED OFF. A LOUD RUSH OF AIR WAS HEARD AND THE CABIN BEGAN TO CLIMB AT 4000 + FEET/MIN. AN EMERGENCY WAS DECLARED. AN EMERGENCY DESCENT INITIATED. PILOT DEPLOYED THE CABIN OXYGEN MASKS. AT AIRCRAFT ALTITUDE 28,000 FT., THE CABIN ALTITUDE WAS STABLE AND DID NOT EXCEED 10,000 FEET. A MAINTENANCE INVESTIGATION DEFECTIVE PRSOV, AND PRECOOLER VALVE ON RIGHT SIDE BOTH ITEMS WERE REPLACED. RIGHT SAFETY VALVE WAS FOUND DAMAGED AND REPLACED. LEFT TURBINE OVERHEAT SENSOR, LEFT COMPRESSOR DISCHARGE SWITCH, LEFT MIX VALVE, LEFT PACK ACTUATOR REPLACED. LEFT 250 DEGREE SENSOR AND 190 DEGREE SENSOR REPLACED. PRESSURIZATION SYSTEM CHECKED AND FOUND SATISFACTORY. SUBMISSION OF THIS REPORT CLOSES THIS INCIDENT.

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.