Make certain that the maintenance organisations’ regulations require dual release processes following critical maintenance work

Under Airworthiness Directive EASA AD 2004–0009 R2 the control air pressure sensing lines of Rolls-Royce (Allison) 250 Series engines are critical parts as regards the safety of flight. During maintenance and reassembly it is important to provide for an independent inspection which is signed off in the maintenance documentation. It is also important to meticulously follow the Airworthiness Directive at the practical level.

Safety Investigation Authority, Finland recommends that Transportstyrelsen and the Finnish Transport Safety Agency make certain that the maintenance organisations’ regulations require dual release processes following critical maintenance work (EC 2042/2003, Part M, subparts C & D). At the same time it must be checked that Airworthiness Directive EASA AD 2004–0009 R2 is fully implemented at the practical level as well.

Under Airworthiness Directive EASA AD 2004–0009 R2 the control air pressure sensing lines of Rolls-Royce (Allison) 250 Series engines are critical parts as regards the safety of flight. During maintenance and reassembly it is important to provide for an independent inspection which is signed off in the maintenance documentation. It is also important to meticulously follow the Airworthiness Directive at the practical level.