AD NUMBER: 2005-06-07 MANUFACTURER: General Electric SUBJECT: Airworthiness Directive 2005-06-07 SUMMARY: The FAA is
superseding an existing airworthiness directive (AD) for GE
CF6-80A1/A3 and CF6-80C2A series turbofan engines. That AD
currently requires completing one of the following actions before
further flight: performing a directional pilot valve (DPV) pressure
check for leakage, and, if necessary, replacing the DPV assembly
with a serviceable assembly, or replacing the DPV assembly with a
serviceable assembly, or deactivating the thrust reverser, and
revising the FAA-approved airplane flight manual (AFM) to require
applying performance penalties for certain takeoff conditions if a
thrust reverser is deactivated. That AD also requires revising the
Emergency Procedures Section of the FAA-approved AFM to include a
flight crew operational procedure for use in the event of any
indication of an in-flight thrust reverser deployment. This AD
specifies the same requirements for leak checks, but increases the
interval between required checks. This AD also removes the
requirement to revise the Limitations Section and the Emergency
Procedures Section of the applicable AFM when deactivating one or
both thrust reversers. This AD results from Airbus Industrie, the
airplane manufacturer, revising the master minimum equipment list
(MMEL) to include procedures for operating the airplane with the
thrust reversers deactivated, and revising the AFM to include
procedures for emergency operation if the thrust reversers deploy
while in flight. This AD also results from the engine manufacturer
recommending extending the interval between inspecting or replacing
the DPV. We are issuing this AD to prevent inadvertent thrust
reverser deployment, which, if it occurs in-flight, could result in
loss of control of the airplane.
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