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Rolls Royce (Allison) 250 Engine Outer Combustion Case (OCC) Failures


Bring to the attention of operators and maintainers factors to be considered when operating and maintaining the affected engines, based on the findings of the Australian Transport Safety Bureau (ATSB) Final Report AO-2008-067, the Transport Safety Board of Canada (TSB) Investigation Report A12P0134 and recent CASA defect reports describing extensive OCC duct cracking in the ‘armpit’ area, in order to prevent OCC duct rupture and loss of power.

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