SInGAPORE_AIR From United Kingdom, joined Nov 2000, 13746 posts, RR: 19 Posted (6 years 2 months 1 week 3 days 1 hour ago) and read 2325 times:
First A380-related airworthiness directive orders Trent vane check
European safety regulators have drawn up the first airworthiness directive relating to the Airbus A380, mandating checks for cracking of vanes in Rolls-Royce Trent 900 high-pressure turbines.
The directive, issued by the European Aviation Safety Agency, states that development testing and flight tests of the Trent 900 have revealed evidence of cracking on some nozzle guide vane surfaces.
Excessive cracking on the vanes' convex surface could, it says, lead to possible fracture of high-pressure turbine blades - and subsequent engine damage - if vane material is released. Turbine gas flow could also be blocked, it adds.