NTSB Identification: MIA88IA231.
The docket is stored on NTSB microfiche number 36430.
Scheduled 14 CFR operation of PAN AMERICAN WORLD AIRWAYS (D.B.A. PAN AM )
Incident occurred Sunday, July 24, 1988 in MIAMI, FL
Probable Cause Approval Date: 01/25/1990
Aircraft: BOEING 737-222, registration: N69AF
Injuries: 85 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.

FLT EXPERIENCED FAILURE OF THE NUMBER TWO ENGINE SHORTLY AFTER TAKEOFF WHEN THE COMBUSTION OUTER CASE RUPTURED. METALLURGICAL EXAMINATION REVEALED THE RUPTURED CASE HAD A 1/2 INCH CRACK IN IT WHEN IT WENT THROUGH OVERHAUL 16 CYCLES BEFORE THE FAILURE. IT WAS FURTHER DETERMINED THAT THE NICKLE AND CADMIUM PLATING PLACED ON THE CASE AT OVERHAUL WAS NOT PROPER THICKNESS RESULTING IN CADMIUM EMBRITTLEMENT OF THE CASE BASE MATERIAL AND THEN THE CASE RUPTURE.

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

COMBUSTION ASSEMBLY,OUTER CASING..CRACKED

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

MAINTENANCE,OVERHAUL,MAJOR..IMPROPER..COMPANY MAINTENANCE PERSONNEL

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

COMBUSTION ASSEMBLY,OUTER CASING..RUPTURED

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