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Tue, Apr 28, 2009

AD: Turbomeca

AD NUMBER: 2009-09-03

MANUFACTURER: Turbomeca
SUBJECT: Airworthiness Directive 2009-09-03
SUMMARY: We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: Several cases of Gas Generator Turbine (HP Turbine) blade rearward displacement have been detected during borescope inspection or in repair centre following engine disassembly. Two of them resulted in blade rubs between the rear face of the firtree roots and the rear bearing support cover. High HP blade rearward displacement canpotentially result in blade release due to fatigue of the blade, which would cause an uncommanded in-flight engine shutdown. We are issuing this AD to prevent an uncommanded inflight engine shutdown which could result in an emergency autorotation landing or, at worst, an accident.

FMI: http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/1F60DE626DEEAA81862575A50048B8AA?OpenDocument

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