AD 2006-04-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; General Electric Company CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 Series Turbofan Engines |
| engine | General Electric | Company CF34-1A | Airworthiness Directives; General Electric Company CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 Series Turbofan Engines |
Unsafe Condition
Suspect stage 5 LPT disks and stage 6 LPT disks that could fail due to low-cycle fatigue cracking starting at the site of an electrical arc-out on the disk.
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Required Actions
Initial and repetitive visual inspections and eddy current inspections (ECIs) of certain stage 5 and stage 6 LPT disks. Eventual replacement of the affected disks as terminating action to the repetitive inspections.
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Compliance Time
Within the compliance times specified in Table 1 of this AD.
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Affected Aircraft
General Electric Company CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 series turbofan engines with specific stage 5 and stage 6 LPT disks, installed in Bombardier Canadair Regional Jet (RJ) and Business Jet (BJ) airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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