AD NUMBER: 2005-07-06
MANUFACTURER: General Electric
SUBJECT: Airworthiness Directive 2005-07-06
SUMMARY: The
FAA is superseding an existing airworthiness directive (AD) for
General Electric Company (GE) CF34-8C1 series and CF34-8C5 series
turbofan engines, with certain serial number (SN) master variable
geometry (VG) actuators installed. That AD currently requires
initial and repetitive reviews of the airplane Maintenance Data
Computer (MDC) for master VG actuator fault messages, and if the
MDC is inoperative, reviews of the Engine Indication and Crew
Alerting System (EICAS) for fault messages. That AD also requires
replacing actuators reported faulty by the Full Authority Digital
Engine Control (FADEC).
This ad requires those same actions, and expands the
applicability to additional actuators by part number (P/N) and SN.
This AD also prohibits installation of affected master VG actuators
onto any CF34-8C1 and CF34-8C5 engine after the effective date of
this AD. This AD results from the need to add to the list of
affected parts, master VG actuators made by parts manufacturer
approval (PMA). We are issuing this AD to prevent dual-channel
electrical signal faults in the VG master actuator, which will
cause an uncommanded reduction of thrust to idle with a subsequent
loss of the ability to advance thrust above idle, and which will
result in a multiengine loss of thrust if dual-channel faults occur
on more than one engine simultaneously.
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