NTSB Identification: IAD96IA098.
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Scheduled 14 CFR (D.B.A. TOWER AIR )
Incident occurred Monday, June 17, 1996 in JAMAICA, NY
Probable Cause Approval Date: 03/31/1998
Aircraft: Boeing 747-136, registration: N606FF
Injuries: 414 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.

The pilots stated that at flight level 350, just before their descent to JFK, the No. 2 engine generator warning light and CSD low oil pressure light illuminated. Attempts to disconnect the CSD were unsuccessful, and the No. 2 engine was shut down. Following the shutdown, the No. 2 engine fire warning sounded, and the flightcrew discharged both No. 2 engine fire bottles; however, the fire continued. After declaring an emergency and landing at JFK, firefighters noted that the gearbox was glowing red, and they used extinguishing agent. Examination of the engine and accessory gearbox components revealed that the CSD failed to disconnect, because it had not been overhauled in accordance with the manufacturers overhaul manual.

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

failure of the constant speed drive (CSD) to disconnect from the generator. Contributing to the cause was the failure of the FAA approved overhaul facility to follow the manufacturer's overhaul manual.

Full narrative available

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