B738, vicinity Paris Orly France, 2018

B738, vicinity Paris Orly France, 2018

Summary

On 7 February 2018, a Boeing 737-800 experienced an airspeed mismatch during takeoff on a post maintenance positioning flight but having identified the faulty system by reference to the standby instrumentation, the intended flight was completed without further event. After the recorded defect was then signed off as “no fault found” after a failure to follow the applicable fault-finding procedure, the same happened on the next (revenue) flight but with an air turnback made. The Investigation found that the faulty sensor had been fitted at build three years earlier with a contaminated component which had slowly caused sensor malfunction to develop.

Description

On 7 February 2018, a Boeing 737-800 (F-GZHO) being operated by Transavia France on a post maintenance positioning flight from Norwich to Paris Orly after undergoing a ‘C’ Check experienced an airspeed mismatch during a night VMC takeoff but after the crew had identified the faulty system by reference to the standby instrumentation, the flight was completed. After the recorded defect was then signed off overnight as “no fault found”, the same thing happened on the first flight the following day, an international passenger flight from Paris Orly to Marrakesh which took off in day VMC, but this time an air turnback followed.

Investigation

An Investigation was carried out by the French Civil Aviation Accident Investigation Agency, the BEA assisted by history of maintenance faults obtained from QAR data and crew statements.

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