NTSB Identification: NYC90FA038.
The docket is stored on NTSB microfiche number 43230.
Accident occurred Friday, December 08, 1989 in NEWARK, NJ
Probable Cause Approval Date: 10/07/1992
Aircraft: BOEING 727-31, registration: N727PJ
Injuries: 7 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

AT FLIGHT LEVEL 370 THE CREW HEARD A LOUD EXPLOSION-TYPE NOISE. THE #1 ENGINE SHOWED A POWER LOSS, AND THE AIRPLANE BEGAN TO VIBRATE. THE CREW SHUT THE ENGINE DOWN, AND AN UNEVENTFUL 2-ENGINE LANDING WAS MADE AT NEWARK. AN ENGINE TURBINE BLADE WAS FOUND LODGED IN THE AIRPLANE'S VERTICAL STABILIZER. AN ENGINE TEARDOWN SHOWED THERMAL DISTRESS TO THE FIRST STAGE TURBINE BLADES CAUSING A DEGRADATION OF MATERIAL PROPERTIES RESULTING IN BLADE FRACTURES. THE CAUSE OF THE THERMAL DISTRESS WAS NOT DETERMINED.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

THERMAL DISTRESS OF THE FIRST STAGE TURBINE BLADES OF THE NUBER ONE ENGINE CAUSING A DEGRADATION OF MATERIAL PROPERTIES WHICH RESULTED IN BLADE FRACTURES. THE REASON FOR THE THERMAL DISTRESS WAS NOT DETERMINED.

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