# Incident 20110907021639I: Mcdonnell Douglas DC-9-83(MD-83), Pittsburgh, PA, September 7, 2011

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: September 7, 2011, 12:54 local time
- Place: Pittsburgh, PA
- Airport: Pittsburgh International Airpo
- Damage: Minor damage
- Phase of flight: Cruise/Level Flight
- Operating rules: General operating rules (Part 91)
- Location: 40.4914° N, 80.2327° W: Placed by OpenAirDocs at PITTSBURGH INTL (PIT), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=40.4914&lon=-80.2327&mi=10
- Aircraft: N950NS, registered now (https://openairdocs.org/aircraft/N950NS) (OpenAirDocs)
- Registry model: Mcdonnell Douglas DC-9-83(MD-83) (registry code 3022083, https://openairdocs.org/model/mcdonnell-douglas-dc-9-83-md-83) (OpenAirDocs)
- Registry engine: Pratt & Whitney JT8D series (registry code 52053, https://openairdocs.org/engine/pratt-whitney-jt8d-series) (OpenAirDocs)
- Reported make and model: MCDONNELL DOUGLAS DC-9-83(MD-83)
- Reported engine: P & W JT8D-219
- People aboard: 87
- Fatal injuries: 0
- Other injuries: 0
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20110907021639I

## Narrative

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

ON SEPTEMBER 7, 2011 AT APPROXIMATELY 1254 EASTERN TIME, AIRCRAFT N950NS, A MCDONNELL DOUGLAS DC-9-83, OPERATING UNDER TITLE 14 CFR PART 91, OPERATED BY THE UNITED STATES MARSHALS SERVICE / JUSTICE PRISONER AND ALIEN TRANSPORTATION SYSTEM, FLIGHT NUMBER 495, ENCOUNTERED A RAPID DECOMPRESSION WHILE AT CRUISE.  THE PASSENGER'S OXYGEN MASK WERE AUTOMATICALLY DEPLOYED.THE CREW DIVERTED THE AIRCRAFT TO PITTSBURGH INTERNATIONAL AIRPORT (KPIT) AND LANDED ON RUNWAY 10R; SUBSEQUENTLY TAXIING TO THE RAMP WITHOUT FURTHER INCIDENT.  IT APPEARS THE ACTION OF THE CREW DID NOT CONTRIBUTE TO THIS EVENT.   CONTRACT MAINTENANCE PERSONNEL FROM SUNDOWNER OKLAHOMA CITY, LLC TROUBLESHOT THE AIRCRAFT'S PRESSURIZATION SYSTEM AND REPAIRED THE SYSTEM BY CHANGING THE FOLLOWING COMPONENTS:1)THE NUMBER 2 CABIN PRESSURE CONTROLLER WAS REMOVED AND REPLACED DUE TO A BITE FAILURE (WAS ORIGINALLY IN THE NUMBER 1 POSITION BEFORE TROUBLESHOOTING).  2)THE OUTFLOW VALVE ACTUATOR WAS REMOVED AND REPLACED (HONEYWELL PART NUMBER: 2022014-2 OFF / 2021974-2 ON)(SERIAL NUMBER: 73-991 OFF / 22-420 ON)3)THE CABIN PRESSURE SELECTOR (PART NUMBER: 130590-1)(SERIAL NUMBER: 63-326 OFF / 28-480 OFF)

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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