3 more A380s have been found with engine anomalies. Fleet will remain grounded for awhile longer. Seems to be an issue with oil in the engine where it shouldn`t be
http://news.yahoo.com/s/nm/20101108/ts_nm/us_qantas
EASA had previously put out an airworthiness directive against the Trent 900 related to oil migration. Maybe someone missed the memo?
Quote:
Wear, beyond Engine Manual limits, has been identified on the abutment faces of the splines on the Trent 900 Intermediate Pressure (IP) shaft rigid coupling on several engines during strip. The shaft to coupling spline interface provides the means of controlling the turbine axial setting and wear through of the splines would permit the IP turbine to move rearwards.
Rearward movement of the IP turbine would enable contact with static turbine components and would result in loss of engine performance with potential for in-flight shut down, oil migration and oil fire below the LP turbine discs prior to sufficient indication resulting in loss of LP turbine disc
integrity. Some of these conditions present a potential unsafe condition to the aeroplane.
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From a good analysis on the problems with the Trent 900 and the A380
http://www.bnet.com/blog/airline-bus...0-engines/2789
