AD 2007-07-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric | Company CF34-1A | Airworthiness Directives; General Electric Company CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 Turbofan Engines |
Unsafe Condition
Electrical arc-out defects in fan disks, which can result from incorrect electro-chemical etch marking (ECM) procedures, leading to uncontained fan disk failure.
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Required Actions
Perform on-wing tactile and enhanced visual (TEV) inspection of fan disks for electrical arc-out defects on fan disks installed on regional jets within 500 flight hours after the effective date. Conduct shop-level inspections using fluorescent penetrant inspection (FPI), enhanced TEV, and eddy current inspection (ECI) for cracks and electrical arc-out defects on all affected fan disks. Maintain the reduced life limit for certain fan disks as previously required.
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Compliance Time
Within 500 flight hours after the effective date
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Affected Aircraft
General Electric Company CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 turbofan engines, as identified by serial number and part number in the referenced service bulletins.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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