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AD: Allied Signal (GE)

AD NUMBER: 2003-12-08
MANUFACTURER: Allied Signal
SUBJECT: Airworthiness Directive 2003-12-08
Click to EnlargeSUMMARY: This amendment adopts a new airworthiness directive (AD), that is applicable to General Electric Company (GE) CF6-80A1/A3 and CF6-80C2A PMC series turbofan engines. This amendment requires performing either a directional pilot valve (DPV) pressure switch moisture purge procedure and an operational check of the fan reverser or replacing the DPV assembly with a serviceable assembly and performing an operational check of the fan reverser. Thereafter, this AD requires one of these actions on a repetitive basis. This amendment is prompted by a review of fan reverser safety analyses resulting from the discovery of an undetectable failure mode of the DPV pressure switch on certain GE CF6-80C2A and CF6-80A1/A3 engine models. The actions specified by this AD are intended to prevent inadvertent fan reverser deployment, which, if it occurred in flight, could result in loss of control of the airplane.

FMI: www.avantext.com/DailyADIndex.ASP?AD=20031208

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