Ohio-based GE Aviation confirms it is shipping four "compliance engines" to its Ohio facilities. Compliance engines are those that will power 777Xs during Boeing's flight tests.
"The GE9X engines are the compliance engines that will be returned for the high-pressure compressor hardware enhancements that GE revealed at the Paris air show," the company tells FlightGlobal. "GE Aviation remains aligned with Boeing on this effort as we work toward first flight" of the 777X.
Boeing did not immediately provide comment.
The Flight test engines will have a huge amount of extra instrumentation on them so easier I guess to tear them down and rebuild than build new units.
This does however mean that Boeing is going to have to wear the embarrassment of having 777-9's parked up rocking concrete blocks hanging from their engine pylons.