The Rolls-Royce RB211-535-E4D powerplant has been dropped from the competition to re-engine 126 Lockheed Martin C-5A/B transports after the release of a request for proposals (RFP).

Lockheed Martin, armed with a preliminary $15 million contract, has been tasked with selecting a new powerplant for the C-5. Its RFP gives General Electric, Pratt & Whitney and R-R until 24 April to submit proposals.

Lockheed Martin seeks a flat rated 50,000lb-thrust (220kN) engine, ruling out the 43,000lb-thrust RB211. Instead, R-R is proposing the Trent 500. The other contenders are derated versions of the GE CF6-80C2 and P&W PW4650.

Source: Flight International