NTSB Identification: DCA89IA016.
The docket is stored on NTSB microfiche number 38390.
Scheduled 14 CFR operation of EASTERN AIR LINES, INC. (D.B.A. EASTERN AIR LINES )
Incident occurred Monday, December 26, 1988 in MORGANTOWN, WV
Probable Cause Approval Date: 06/11/1990
Aircraft: BOEING 727-25, registration: N8148N
Injuries: 2 Minor,108 Uninjured.
NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.
FUSELAGE SKIN 'FLAPPED' OPEN BETWEEN BODY STATIONS 1090 AND 1110 AND PEELED DOWNWARD FROM STRINGER #4 LEFT TO STRINGER #5 LEFT. A SCRATCH OR SCRIBE MARK WAS CO-LOCATED WITH THE LONGITUDINAL CRACK ALONG STRINGER #4. THE AREA OF DAMAGE WAS LOCATED ON THE AFT UPPER SIDE, FWD OF THE INLET FOR THE #2 ENGINE. THE CRACK HAD INITIATED AT MULTIPLE ORIGINS ALONG THE SCORE MARK AND HAD GROWN BY FATIGUE THROUGH THE THICKNESS OF THE MATERIAL. A STRIATION COUNT FOUND THAT BETWEEN 3360 AND 5040 CYCLES OF FATIGUE PROGRESSION WERE PRESENT. THE SCRATCH/SCORE WAS MADE BY USE OF MARKING TOOLS DURING A REPAIR PROCESS.
The National Transportation Safety Board determines the probable cause(s) of this incident to be:MAINTENANCE,MAJOR REPAIR..IMPROPER..COMPANY MAINTENANCE PERSONNEL
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