Williams FJ33-4A certified; wraps loosening on new engine

 - July 25, 2007, 10:30 AM

On September 10, Walled Lake, Mich.-based Williams International received FAA type certification of its new 1,568-pound-thrust FJ33-4A. The company will follow this milestone with the introduction of yet another turbofan engine.

The FJ33-4A, which was originally scheduled for FAA certification in 2002, has been selected for the following in-development very light jets: Adam A-700, Diamond D-Jet, Air Technology Group Javelin and Safire Aircraft Safire Jet, as well as a number of other proposed VLJs that have progressed little over the years. Williams said it delayed its final certification program to “incorporate its advanced, dual-channel, full authority digital engine control (FADEC) sensor suite and software, which are common with those Williams…certified as part of the FJ44-3 engine” less than three months ago.

On July 30 Williams International announced both the delivery of the 2,000th FJ44 and FAA certification of the 3,000-pound-thrust  FJ44-3A variant. The more powerful, dual-channel-FADEC-equipped FJ44-3A is the powerplant for the Cessna Citation CJ3, for which certification was imminent at press time.

Also at press time, Williams disclosed that it is “within a few months” of completing the certification testing for yet another previously undisclosed new turbofan engine at the “smaller end” of its growing product line. The company will announce the engine at this month’s NBAA Convention in Las Vegas.

Williams declined to comment at press time if the new engine is intended to be competitive with the 900-pound-thrust Pratt & Whitney Canada PW610 or be in the 750-pound-thrust range of the FJ22, the engine Eclipse Aviation originally selected (and later rejected) for its Eclipse 500 very light twinjet.

In late 2002 Eclipse Aviation terminated its agreement with Williams to use the EJ22 (as it was later designated) on the Eclipse 500, deciding instead to go with the PW610 because it would deliver the additional thrust needed.