[新聞] 華航陸續更新 CF6 blades after corrosion incidents
華航陸續更新 CF6 blades after corrosion incidents
DATE:17/03/11
SOURCE:Flight InternationalChina Airlines renews CF6 blades after corrosion
incidents
By Ghim-Lay Yeo
General Electric is contacting operators of its CF6-80E1 engines in Asia to
check for corrosion on the powerplant's high-pressure turbine blades,
following three engine shutdown events on China Airlines Airbus A330-300s.
Hot corrosion caused the incidents, in December 2010 and January 2011, in
which flights turned back. The blades involved were in the first-stage
high-pressure turbine of certain high-cycle CF6-80E1 engines.
"Preliminary analysis strongly indicates the corrosion damage on the blade
surface may have been caused by certain environmental conditions, such as air
pollution and other contaminants. The damage on the blades was extensive and
they could not be repaired," says GE Aviation.
GE is contacting other CF6-80E1 operators in the region to determine if their
blades have similar corrosion damage.
"We are still early in this process and are not sure if the problem has
affected operators to the same extent that China Airlines has experienced,"
says GE.
China Airlines' engines were delivered from 2004. GE introduced a more robust
blade on the engine as standard in 2008, with a resistant coating "that
enhances blade life", and issued a service bulletin to operators recommending
inspection for corrosion during routine engine overhauls. Blades with minimal
corrosion can be repaired with a coating.
"However if the corrosion is too much, the blade should be replaced with the
new improved HPT blade," says GE.
GE is working with China Airlines to retrofit the new blades. While the
airline says it needs to replace only the affected blades, it is replacing
all engine blades on its 18 A330s as a precaution. Seventy percent of the
work, covering 41 engines, is complete and all blades will be replaced by May.
Taiwan's China Airlines adds that GE investigated its maintenance procedures
and found the carrier conformed with instructions, and the operating
environment was "no different" from other carriers.
http://www.flightglobal.com/articles/2011/03/17/354475/
china-airlines-renews-cf6-blades-after-corrosion-incidents.html
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