Airbus

Please find below AIRBUS’s view on the NPRM 2010-NE-20-AD (Docket No. FAA–2010–0494): AIRBUS concurs with the FAA’s position to require repetitive inspections as per IAE SB No. V2500-ENG-72-0580, Revision 2, dated August 12, 2010, and implementation of improved durability stage 1 blade outer air seal (BOAS) segments as per IAE SB No. V2500-ENG-72-0483, Revision 3, dated January 7, 2009, and IAE SB No. V2500- ENG-72-0542, Revision 1, dated January 7, 2009. As regards the potential consequences of the loss of the HPT stage 1 BOAS, the NPRM states that: “This condition, if not corrected, could then result in HPT case burn-through, uncontrolled undercowl engine fire, and damage to the airplane.” AIRBUS would like to precise that the potential pylon lower spar damage caused by HPT case burn through would not prevent continued safe flight and landing. AIRBUS thinks also that, based on the analysis of potential impact on nacelle structure, such a BOAS liberation could lead to the loss of latch redundancy and then to the loss of some nacelle parts in flight, whereas no part should detach from the aircraft as per airworthiness requirements. Best regards, Maxime Moilier Single Aisle Aircraft Continued Airworthiness Engineer Product Integrity Division - EIASA Airbus Central Entity Blagnac, FRANCE