A SCHEDULING problem in the low-pressure stator system of the GE90 was responsible for the single-pulse engine stall which hit the GE90 during tests on 4 May at Boeing Field in Washington, says General Electric.
The engine self-recovered after the event, which occurred during stall-margin tests with the WA076, the first GE90-powered 777 for British Airways. GE says that the scheduling problem with the variable stator vanes "...can be corrected with an adjustment to the electronic-control system. No retrofit to the GE90 development engines in the field will be required."
The company says that the GE-powered-certification aircraft, fitted with another engine following the 4 May incident, and the extended-range twin-operations test aircraft "...have continued to fly trouble-free since the surge event".
Source: Flight International
