Event Details

Title:IDG failure, Boeing 757-236, G-BPEE
Micro summary:This Boeing 757-236 experienced an IDG failure which ultimately manifested as an engine fire warning.
Event Time:1998-07-28 at 1025 UTC
File Name:1998-07-28-UK.pdf
Publishing Agency:Aircraft Accident Investigation Board (AAIB)
Publishing Country:United Kingdom
Report number:EW/G98/07/35
Site of event:Belfast City Airport
Departure:London Heathrow Airport, London, England, United Kingdom
Destination:George Best Belfast City Airport, Belfast, Northern Ireland
Airplane Type(s):Boeing 757-236
Flight Phase:Cruise
Operator(s):British Airways
Type of flight:Revenue
Serious Injuries:0
Other Injuries:0
Executive Summary:On the previous flight from Manchester to Heathrow, the crew had received 'GEN DRIVE' and 'GEN OFF' warnings for the No 2 engine on the Engine Indication and Crew Alerting System (EICAS). The crew therefore operated the Integrated Drive Generator (IDG) disconnect switch and then used the Auxiliary Power Unit to provide additional electrical power, as required by the Quick Reference Handbook and Standard Operating Procedures. After the arrival at Heathrow, the 'Status/Maint MSG' page had indicated 'BPCU BITE' (electrical Bus Power Control Unit fault detected by the Built in Test Equipment), 'DP TRIP' (Differential Protection loss) and 'IDG LOW OIL PX' messages. The IDG oil level had subsequently been inspected and found full. The No 2 engine had then been run up to idle and the disconnect switch operated again, this being an additional requirement following an IDG disconnect to ensure that manual reconnection of a defective IDG has not been carried out, in error, by maintenance personnel. The aircraft had then been cleared for a flight to Belfast with the No 2 engine IDG inoperative and with an Aircraft Deferred Defect entry in the Technical Log for later IDG replacement, in accordance with the permitted deficiencies in the Dispatch Deviation Manual.

However, during the subsequent Heathrow to Belfast sector, when the aircraft was in the cruise at Flight Level 260 over the Isle of Man, a No 2 engine fire warning occurred with activation of the fire warning bell and illumination of the associated fire warning lamps. The crew carried out the engine fire drill and after some 30 seconds, during which the second fire extinguishant bottle was fired, the fire warning cancelled. An emergency was declared and the flight continued to Belfast where the aircraft landed without further incident.
Learning Keywords:Systems - Electrical
Systems - Engine Fire
Close match:Smoke emergency involving a Boeing 737-488, EI-BXI, on June 3, 1999 at Dublin Airport
Electrical failure, Boeing 767, June 19, 1996
CSD overheat resulting in engine shutdown, Boeing 747-136, June 17, 1996


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