AD 2004-26-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | GE | Various | Airworthiness Directives; GE Aircraft Engines (GE) CF34-3A, CF34-3A2, CF34-1A, CF34-3A1, CF34-3B, and CF34-3B1 Series Turbofan Engines |
Unsafe Condition
LCF cracks and failure of the HPC forward spool, which could result in an uncontained engine failure and damage to the airplane.
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Required Actions
Remove from service HPC forward spools, P/Ns 6078T56P03 and 6078T56P04, at the first piece-part exposure after 6,000 cycles-since-new (CSN), but no later than 20,000 CSN for CF34-3B engines, and no later than 22,000 CSN for CF34-3A, CF34-3A2, CF34-1A, CF34-3A1, and CF34-3B1 engines. After the effective date, do not install HPC forward spools P/N 6078T56P03 or P/N 6078T56P04 with more than 0 CSN.
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Compliance Time
Within the specified cycle limits: 20,000 CSN for CF34-3B engines and 22,000 CSN for CF34-3A, CF34-3A2, CF34-1A, CF34-3A1, and CF34-3B1 engines.
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Affected Aircraft
GE CF34-3A, CF34-3A2, CF34-1A, CF34-3A1, CF34-3B, and CF34-3B1 series turbofan engines with HPC forward spool, part number (P/N) 6078T56P03 or 6078T56P04, installed. These engines are installed on, but not limited to, Bombardier Business Jet Models CL-600-2A12, CL-600-2B16, and Regional Jet Model CL-600-2B19 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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