Airbus has powered up the prototype A350-900's engines for the first time, after starting the auxiliary power unit.
The aircraft is fitted with two Rolls-Royce Trent XWB powerplants.
It follows transfer of the A350-900, MSN1, to the flight-test operation in preparation for the aircraft's maiden flight.
Airbus rolled out the jet on 13 May in the airframer's colour scheme. It has yet to indicate when first flight will take place.
There are 616 firm orders for the twinjet including 414 for the -900 version.