Boeing 747-200 Rolls Royce Trent 1000 Test Bed
The Rolls-Royce Boeing 747-200 flying test bed for Trent 1000 engines.
A Boeing 747-200 serving as the Rolls-Royce flying test bed, carrying a Trent 1000 on the inboard pylon.
Engine makers use old widebodies this way because a four-engined aircraft can fly safely with one position occupied by an experimental engine — the other three get you home. The Trent 1000 being tested here was destined for the Boeing 787.
Image courtesy of AirlineReporter
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