# Incident 19990722032619I: Fokker F28MK0100, Middletown, PA, July 22, 1999

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: July 22, 1999, 15:59 local time
- Place: Middletown, PA
- Airport: Harrisburg International Airport-Olmsted
- Phase of flight: Normal Cruise
- Operating rules: Air carrier (Part 121)
- Operator: AALA
- Location: 40.2009° N, 76.7292° W: Placed by OpenAirDocs: center of Middletown, PA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=40.2009&lon=-76.7292&mi=10
- Aircraft: N1427A, a cancelled registration (https://openairdocs.org/deregistered/N1427A-2006-05-04) (OpenAirDocs)
- Registry model: Fokker F.28 MK 0100 (registry code 4990807, https://openairdocs.org/model/fokker-f-28-mk-0100) (OpenAirDocs)
- Registry engine: Rolls-Royce TAY-650-15 (registry code 54557, https://openairdocs.org/engine/rolls-royce-tay-650-15) (OpenAirDocs)
- Reported make and model: FOKKER F28MK0100
- People aboard: 2
- Fatal injuries: 0
- Pilot flight hours: 11,000 total, 4,000 in this make and model, 210 in the last 90 days
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19990722032619I

## Narrative

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

(-23) THE #1 HYDRAULIC SYSTEM LOW QUANTITY LIGHT CAME ON IN CRUISE AT FL29. A NON-EVENTFUL LANDING WAS MADE AT THE DESTINATION AIRPORT, MIDDLETOWN (MDT).  MAINTENANCE PERSONNEL AT MDT DETERMINED THE LOW HYDRAULIC QUANTITY WAS CAUSED BY A LEAKING O-RING IN THE #1 PRESSURE MANIFOLD.  THE AIR CARRIER'S MAINTENANCE PERSONNEL REPLACED A PINCHED O-RING IN THE PRESSURE MANIFOLD, RE-SERVICED THE #1 HYDRAULIC SYSTEM, AND APPROVED THE AIRCRAFT FOR RETURN TO SERVICE.  A MECHANICAL RELIABILITY REPORT WAS SUBMITTED BY THE CARRIER ON JULY 22, 1999.

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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