Software link suspected in Airbus A220 engine blowouts-sources

A probe into a series of engine failures on the Airbus A220, is studying whether a software change set off unexpected vibrations that damaged fast-moving parts and forced 3 emergency landings, people familiar with the case said. SWISS briefly halted its fleet of A220 jets for checks Oct 15 after a third flight in as many months was forced to divert with engine damage. Pratt & Whitney also expanded checks on similar engines worldwide. Investigators are focusing their attention on recent changes in engine software that may have caused parts that compress air inside the engine to be set in a way that caused destructive vibrations. Pilots have been told to avoid certain combinations of thrust settings and altitude to avoid the risk of a new problem until the root cause of the SWISS engine failures can be found. <br/>