A gas turbine engine is supported on an aircraft fuselage by a pylon which carries a mounting ring. The mounting ring is releasably coupled to an engine ring on the casing of the engine, centered on the engine axis. A further member extends from the pylon and is secured to a location on the engine which is axially spaced from the mounting ring. The arrangement enables the engine to be on the pylon in different orientations, to suit different mounting configurations on the aircraft.