Pratt & Whitney PW4000

[1] Development of the 64,000–68,000 lbf (280–300 kN), 100 in (2.5 m)-fan version began in December 1991 for the Airbus A330, was FAA certified in August 1993, and made its first flight two months later.[1] The Advantage 70 upgrade package for the PW4168A, which powered around one-third of the active Airbus A330 fleet, was launched at the 2006 Farnborough Airshow, increasing thrust to 70,000 lbf (311 kN), and reducing fuel burn by about 1.2% as well as overall operating costs by as much as 20%.The 98,000 lbf (440 kN) PW4098 received FAA certification in July 1998 and was introduced on the Boeing 777-300 in September 1999 but was a few years later discontinued due to core temperature problems and fuel burn that was not appealing to airlines..[1] In 2000, over 2,000 PW4000 engines had accumulated over 40 million hours of service with 75 operators.[1] Like other modern aircraft power plants, it has a Full Authority Digital Engine Control (FADEC), for better fuel economy and reliability.[4] Furthermore, single-crystal alloys allows higher temperature capability and PW's Floatwall combustor liners improve durability and maintainability.
A PW4074 on an ANA 777-200 under maintenance with the fan doors open, showing the fan disk inside the inlet cowling at the front of the engine
PW4077 titanium-bladed fan section with containment ring in the United Airlines maintenance facility at SFO
A PW4000-94 engine on Boeing 767-300ER
A PW4000-100 on Airbus A330-200
The PW4000-112 on the original Boeing 777-200
UAL1175 PW4077 fan blade root section fracture surface showing metal fatigue
Damage to hollow fan blades from UA328 , fracture surface near hub at top of photo
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