All operators of certain Bombardier Challenger 600-series aircraft with General Electric CF34-3A1/-3B/-3B1 turbofans will soon receive word in the form of an emergency airworthiness directive 2007-04-51 informing them that an electrical arc-out defect potentially introduced during manufacturing could lead to uncontained engine failure. The FAA found that the defect can be introduced during the part-marking phase of manufacturing. This emergency AD results from the investigation of a fan disk failure episode aboard a Canadair Regional Jet that resulted in in-flight departure of the fan, forward cowling and fan reverser. Operators must comply within 20 engine flight hours of receipt of this emergency AD, specifically performing visual and tactile inspections on 31 fan disks listed in the AD that have not had a shop-level inspection.
Emergency AD For GE CF34s
Key Takeaways:
- An emergency Airworthiness Directive (AD) is being issued for Bombardier Challenger 600-series aircraft with specific GE CF34 turbofans.
- The AD addresses a manufacturing defect (electrical arc-out) that could lead to uncontained engine failure.
- This directive follows an investigation into a fan disk failure on a Canadair Regional Jet.
- Operators must perform visual and tactile inspections on 31 specific fan disks within 20 engine flight hours of receiving the AD.
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