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B734, en-route, Daventry UK, 1995

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Event Details
When February 1995
Actual or Potential
Event Type
Airworthiness, Loss of Control
Flight Conditions

Tag(s) Loss of Engine Power
System(s) Engine - General
Contributor(s) Maintenance Error (valid guidance available)
Location - Airport
Airport London Luton Airport
Flight Details
Aircraft BOEING 737-400
Operator British Midland
Domicile United Kingdom
Type of Flight Public Transport (Passenger)
Flight Phase Climb
Time of day: Day
Flight Conditions: VMC
Training in Progress: No
Damage or injury Yes
Aircraft damage Minor
Injuries None"None" is not in the list (Few occupants, Many occupants, Most or all occupants) of allowed values for the "Injuries" property.
Fatalities None"None" is not in the list (Few occupants, Many occupants, Most or all occupants) of allowed values for the "Fatalities" property. ()
Causal Factor Group(s)
Group(s) Aircraft Technical
Safety Recommendation(s)
Group(s) None Made
Investigation Type
Type Independent


On 23 February 1995, a British Midland Boeing 737-400 made an emergency landing at Luton airport UK after losing most of the oil from both engines during initial climb out from East Midlands airport UK, attributed to failures in the quality of maintenance work and procedures during routine inspections of both engines prior to the flight.


This is an extract from the report published by the Aircraft Accident Investigation Branch (UK) (AAIB), UK:

"The incident occurred when the aircraft was climbing to cruise altitude after a departure from East Midlands Airport en-route to Lanzarote...Following indicated loss of oil quantity and subsequently oil pressure on both engines, the crew diverted to Luton Airport; both engines were shut down during the landing roll. The aircraft had been subject to boroscope Inspections on both engines during the night prior to the incident flight. The High Pressure (HP) rotor drive covers, one on each engine, had not been refitted, resulting in the loss of almost all of the oil from both engines during flight. There were no injuries to any crew or passengers...

The investigation identified the following causal factors:

  1. The aircraft was presented for service following Borescope Inspections of both engines which had been signed off as complete in the Aircraft Technical Log although the HP rotor drive covers had not been refitted.
  2. During the Borescope Inspections, compliance with the requirements of the Aircraft maintenance manual was not achieved in a number of areas, most importantly the HP rotor drive covers were not refitted and ground idle engine runs were not conducted after the inspections.
  3. The Operator's Quality Assurance Department had not identified the non-procedural conduct of the Borescope Inspections prevalent amongst Company engineers over a significant period of time.
  4. The Civil Aviation Authority, during their reviews of the Company procedures' for JAR-145 approval, had detected limitations in some aspects of the Operator's Quality Assurance system, including procedural monitoring, but had not withheld that approval, being satisfied that those limitations were being addressed."

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Further Reading

For further information see the full Report including Appendices published by the AAIB (UK).