February 17th, 2007, 12:57
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#26 |
| Moderator
Join Date: May 2003 Location: GRR
Posts: 8,349
| Re: Mesa CRJ engine failure at DEN? Update. Quote:
Yesterday the FAA issued an emergency AD calling for inspection of about 31 disks. Here is some of the content which helps to provide some additional insight into this investigation:
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DATE: February 16, 2007
AD #: 2007-04-51
This emergency airworthiness directive (AD) 2007-04-51 is sent to all owners and operators of General Electric Aircraft Engines (GE) CF34-3A1/-3B/-3B1 turbofan engines installed on Bombardier, Inc. CL-600-2B16 (CL-601-3R Variant), CL-600-2B16 (CL-604 Variant), and CL-600-2B19 (Regional Jet Series 100 and 440) model airplanes.
Background
This emergency AD results from a report that a GE CF34-3B1 turbofan engine experienced an uncontained fan disk failure during flight operation. After landing the airplane, an inspection of the GE CF34-3B1 engine showed the front section of the engine failed, resulting in the fan, forward cowlings, and fan reverser departing from the engine. The airplane sustained minor fuselage damage. A subsequent inspection of the recovered segments of the fan disk, found an electrical arc-out defect at the fracture origin site. The fan disk was marked using the electro-chemical etch marking (ECM) procedure during engine assembly. If the ECM procedure is performed incorrectly, an arc-out defect can occur. This arc-out defect, caused during part marking, resulted in the uncontained failure. This condition, if not corrected, could result in an uncontained fan disk failure and airplane damage.
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