What happened
While cruising at flight level 350, just prior to beginning their descent into JFK, the flight crew observed the illumination of the No. 2 engine generator warning light and the CSD low oil pressure light. The pilots attempted to disconnect the CSD, but these efforts were unsuccessful. Consequently, the crew proceeded to shut down the No. 2 engine.
Following the engine shutdown, a fire warning for the No. 2 engine was activated. The flight crew discharged both available fire bottles for the No. 2 engine, but the fire persisted. After declaring an emergency, the aircraft landed at JFK. Upon arrival, ground firefighters observed that the gearbox was glowing red and utilized extinguishing agents to combat the fire.
The investigation
An examination of the engine and the accessory gearbox components was conducted following the incident. Investigators determined that the CSD failed to disconnect because it had not been overhauled in accordance with the manufacturer's overhaul manual.