Group : Turbofan Engines
Status : Active
Also Known As : FJ44-1 (and FJ44-1A powering CJ1, CJ1+ and SK60), FJ44-1AP, FJ44-1AP-21 (Citation M2), FJ44-2 (powering CJ2, Eagle, SJ30-2, Learjet 25, Premier I, Proteus and GlobalFlyer), FJ44-2A, FJ44-3 (powering CJ2+ and CJ3), FJ44-3A (and FJ44-4A powering CJ4), FJ44-3A-24, FJ44-3AP (powering Premier II)
Origin : United States of America
Contractor : Williams International
Total Production : ?

The FJ44-1 model, having a thrust range of 1,500 to 1,900 pounds, was certified by the FAA and JAA and was designed for enhanced simplicity and ease of maintenance. The FJ44-1 variant powering the Swedish SK60W trainer is qualified for acrobatic maneuvering. The FJ44-1AP is an enhanced performance version incorporating an all new fan, a dual-channel FADEC engine control and components from the FJ44-3A engine. The FJ44-1AP provides 2,100 pounds of thrust at takeoff. The FJ44-1AP was FAA-certified in 2005.

The FJ44-2 was FAA-certified in 1997 providing between 2,300 and 2,400 pounds of thrust at takeoff. The FJ44-2 uses the same core and low-pressure turbine of FJ44-1 but introducing new fan and compressor sections which enables outstanding cruise performance at high altitude. The FJ44-3 was awarded engine type certification in 2004. The thrust at takeoff has been increased out to 3,000 pounds. The FJ44-4 represents the latest development in the FJ44 engine family. This dual-channel FADEC-equipped turbofan provides 3,500 pounds of thrust at takeoff.

The FJ44-1 engine powers the Citation CJ1 and CJ1+ business jets and the Saab SK60W trainer. The FJ44-2 model has been selected to power the Citation CJ2, Eagle, SJ30-2, Learjet 25 and Raytheon Premier I business jets as well as high altitude experimental aircraft such as Virgin Atlantic GlobalFlyer and Scaled Composites Proteus. The FJ44-3 engine powers Citation CJ2+, CJ3 and Grob SPn jets.

Group : Turbofan Engines
Status : Active
Also Known As : FJ44-4A, FJ44-4A-32, FJ44-4M
Origin : United States of America
Contractor : Williams International
Initial Operational Capability (IOC) : 2010
Total Production : ?

The Williams International FJ44-4 features the best thrust-to-weight ratio in its thrust class, and it incorporates several proprietary aerodynamic improvements that yield a significant reduction in fuel consumption. It derives from the FJ44-3A engine making use of the same full authority digital electronic control (FADEC). The FJ44-4A electronically controlled engine was selected to power the Cessna Citation CJ4 business jet starting in 2010 and delivering 3,400 pounds of thrust per engine. The FJ44-4A-32 engine powers the Hawker XPR which is expected to enter service by 2012.