Pratt & Whitney’s thrust-enhanced PW4000 series is known by the name PW4000-112. With a fan diameter of 9.3 ft and a thrust range from 74,000 to 98,000 pounds, it is one of the largest and most powerful engines in the world. Its fan diameter is almost the same as the fuselage diameter of a Boeing 737. The engine is used in Boeing’s 777-200, 777-200ER, and 777-300 aircraft. It was the first engine to receive 180-minute ETOPS (Extended-range Twin-engine Operation Performance Standards) certification from the outset and is now certified for a maximum duration of 207 minutes.  

Three versions of the PW4000-112—the PW4077, the PW4084, and the PW4090—are currently in service. MTU is responsible for developing and manufacturing key parts of the seven-stage low-pressure turbine for all three versions. It is the largest low-pressure turbine ever developed by MTU.