Guess AC folks will also be doing this refit.
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E170 Fix -
Started by
rattler
, Aug 21 2009 07:34 AM
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#1
rattler
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Posted 21 August 2009 - 07:34 AM
| QUOTE |
| Thrust anomalies spur new E170 airworthiness directive By John Croft The US Federal Aviation Administration is proposing to remove 12 versions of the full authority digital engine controllers (FADECs) that manage thrust on GE CF34-8E engines powering Embraer E-170 regional jets. The proposed updated airworthiness directive (AD), to be published Monday, reveals that an earlier fix to the FADEC software, issued in July 2008 in response to six "loss of thrust" incidents, was not fully effective. According to the FAA, 20 additional reports of loss-of-thrust events have occurred since that time, all tied to the same fuel metering valve feedback faults that the first software fix was meant to correct. The faults were caused by "connector pin micro-arcing", says the agency. "The improvements prevent loss of thrust control by detecting erroneous fuel metering valve feedback signals," says the FAA, adding that "no loss of thrust control events due to pin arcing have occurred with the (new) software version improvements incorporated into the FADECs." The agency says the proposed AD, which would require switching out the software within 660h of the AD becoming final, will affect 273 engines in the US registry. Further, the FAA says the fix will take about 1h to complete for each engine. GE could not be immediately reached for comment. |
