Incident Description
On 2 October 2016, a Boeing 737-400 operated by Enter Air departed from Palma de Mallorca Airport (LEPA) with 128 persons on board. During the climb, after crossing flight level 220 (FL220), the low oil pressure warning light for the No. 1 generator drive illuminated on the electrical panel. The flight crew, consisting of a professional line pilot as captain, performed the applicable checklist. They disconnected the No. 1 generator drive, started the auxiliary power unit (APU), and switched the APU generator to the No. 1 generator bus. The rest of the flight to Poznań-Ławica Airport (EPPO) was completed without further anomalies.
Upon landing, the captain recorded the event in the aircraft technical log and informed the maintenance control center (MCC). Technical personnel conducted inspections, replaced the constant speed drive (CSD) generator drive, and cleared the aircraft for continued operation. None of the 128 occupants were injured.
Cause
The incident was attributed to a malfunction of the CSD generator drive.
The investigation did not result in any safety recommendations.