EASA has directed all Airbus A380 operators to urgently update the A380 Airplane Flight Manual (AFM), with new procedures to prevent the risk of structural damage initiated from bleed-duct bellow rupture.
The emergency directive was issued following a rupture of the bleed duct bellow of the engine pylon was found during an in-service inspection.
The EASA directive noted “During an in-service inspection, damage to a right-hand wing canoe fairing and puncture mark in the skin, extensively exposing the fairing honeycomb core, were detected.
Additional inspection accomplished on the affected nacelle and pylon determined that the Left-Hand (LH) forward hinge panel was missing and the LH aft hinge panel was damaged.
Investigation results revealed that, during take-off phase of the flight, double and dependent failure of the High Pressure Valve (HPV) and Pressure Regulating Valve (PRV) led to Over Pressure Valve (OPV) closure, as expected by the design. This event consequently led to an uncontrolled overpressure in the pneumatic system and a rupture of the bleed duct bellow of the engine pylon.”
The directive is applicable to all A380 models of A380-841, A380-842 and A380-861 aeroplanes powered by both Rolls-Royce Trent 900 and Engine Alliance GP7200 engines