B734, en-route, eastern England UK, 2018

B734, en-route, eastern England UK, 2018

Summary

On 12 October 2018, the crew of a Boeing 737-400 already released to service under MEL conditions with an inoperative No 1 engine generator encountered a loss of services from the No 2 electrical system en-route to East Midlands which created a situation not addressed by QRH procedures. The flight was completed and both the new and existing defects were subsequently rectified relatively easily. The Investigation concluded that the operator involved appeared to be prioritising operational requirements over aircraft serviceability issues and made a range of Safety Recommendations aimed at improving company safety culture and the effectiveness of regulatory oversight.

Description

On 12 October 2018, a Boeing 737-400 (G-JMCR) being operated by West Atlantic UK on a scheduled international cargo flight from Leipzig to Aberdeen via East Midlands was en-route from Amsterdam to East Midlands in VMC at night and had just begun descent to destination after dispatch with the left engine generator disconnected when the AP disconnected, the right side EFIS displays failed and an abnormal array of electrical system failures occurred. A ‘PAN’ was declared and the flight was successfully completed maintaining visual contact with the destination.

Investigation

A Field Investigation was carried by the Aircraft Accident Investigation Branch (UK) (AAIB). The CVR and FDR were removed from the aircraft and their data successfully downloaded but although the 30 minute CVR provided data from about 5 minutes before the beginning of the descent to East Midlands, data from the FDR, whilst complete, did not include that relevant to the functioning of electrical system components.

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