2009-18-19 R1: NRV (non-return valve)

This amendment rescinds airworthiness directive (AD) 2009-18- 19 for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by EASA, to rescind EASA AD 2010-0083. The MCAI specifies the following: \n\n\n\tIt has been assessed that multiple NRV (non-return valve) failures in combination with certain trapped fuel cases could potentially increase the quantity of unusable fuel on the aeroplane, possibly leading to fuel starvation which could result in engines in-flight shut down and would constitute an unsafe condition. To prevent and detect this condition, EASA issued EASA AD 2010-0083. \n\tBased on in service experience, mainly on the results of the operational test required by \n\n((Page 33987)) \n\nEASA AD 2010-0083, Airbus has performed a safety analysis on the NRV to check if the safety objectives are met. \n\tThis analysis of the Collector Cell motive flow line NRV, taking into account all failure scenarios, concludes thatthe previous non compliance can be alleviated. Consequently, no unsafe condition exists any more on the affected NRV. \n\tFor the reasons described above, EASA AD 2010-0083 is cancelled. \n\n\n\tThis AD rescinds the parallel FAA AD 2009-18-19.