AD 2005-07-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric | Company CF34-8C1 Series and CF34-8C5 Series | Airworthiness Directives; General Electric Company CF34-8C1 Series and CF34-8C5 Series Turbofan Engines |
Unsafe Condition
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.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
An initial review within 10 days after the effective date of the AD, of the airplane MDC for fault messages for the master VG actuator, and if the MDC is inoperative, a review of the EICAS for fault messages, and replacement of actuators reported faulty by the FADEC. The same reviews, repetitively, at intervals not to exceed 10 days, and replacement of actuators reported faulty by the FADEC either before further flight or within 10 days of the first fault occurrence. After the effective date of this AD, do not install any master VG actuator that has a part number and serial number listed in this AD onto any engine.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 days after the effective date of the AD for initial review, and repetitively at intervals not to exceed 10 days.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
General Electric Company CF34-8C1 series and CF34-8C5 series turbofan engines with certain serial number (SN) master variable geometry (VG) actuators installed, including additional actuators by part number (P/N) and SN as specified in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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