Threshold Aviation Group

Threshold’s Service Center will provide complete sales, installation and service support for Citation II owners who purchase the Clifford engine package. Threshold will receive technical support and complete installation kits from Clifford Development including engines, engine mounts, nacelles, all service documentation and pilot operating handbook document for the modified airplanes. Installation time for new engines is estimated at approximately six weeks. Threshold will also offer Citation II owners the concurrent installation of upgraded glass cockpits, interiors and aircraft paint. Combined with Threshold’s full service maintenance and inspection program, Citation II owners’ finished project will be a modern, fuel efficient aircraft with a “like new appearance.”

“We are very pleased to announce the appointment of Threshold Aviation Group as a service center,” said Jim Clifford, chief executive officer of Clifford Development. He added, “From the start, we set very specific criteria for our service centers. Threshold Aviation Group exemplifies the key attributes of high technical standards and impeccable customer service.”

“We are very excited about joining with Clifford Development on this project.” Said Mark DiLullo, Chief Executive Officer of Threshold Aviation Group. He continued, “Threshold has nearly two decades of experience with Citation aircraft. This expertise combined with our full service maintenance, inspection capabilities and completions packages will give Citation II owners a fully updated modern aircraft with extended range and significantly better fuel economy and performance.”

Based on performance computations completed using the NASA-developed General Aviation Synthesis Program (GASP), Clifford expects the re-engined CE-550 will have significant performance improvements including a 21 percent long range cruise speed increase, a 29 percent range increase, a 34 percent improvement in single engine climb rate and a 20 percent improvement in fuel efficiency. The FADEC integration allows for a decreased takeoff field length.

The STC engineering effort is nearing completion. Williams FJ44-3 engines have been installed and run on a certification airplane. First flight of the Cessna Citation II with Williams FJ44-3 engines is anticipated in July 2007. Immediately after local flight evaluations, the certification airplane will move to Mojave Airport to begin 250 hours of test flights to verify performance and to meet the FAA requirements. Issuance of the Supplemental Type Certificate is slated for fourth quarter 2007.

The Citation II engine conversion is priced at $2,150,000 for 2008 installations. This price includes engine mount kits, nacelles, engines, engine instrumentation, installation labor and training. The price includes a credit for the original engines.

About Clifford Development – Clifford Development was formed to rapidly develop STC's for the installation of new engine technologies on the existing fleet of high value corporate jets. The company will fund major re-engining certification programs to enhance the safety, value and performance of corporate jets. The company will focus individual teams of highly experienced aerospace engineers on certification programs using the best available project management technology and certification processes. Detailed performance data on the re-engined Citation II are available at www.clifforddevelopmentgroup.com. More information about the Williams International FJ44-3 and Williams’ world-class product support is available at: www.williams-int.com.

About Threshold Aviation Group – Threshold Aviation Group is a full service aviation company based in Chino, CA. Founded in 1990 by Mark and Lisa DiLullo, the company operates from a 136,000 square foot modern hanger complex on the Chino Airport (KCNO) in Southern California. Threshold provides maintenance and management services to a wide variety of operators in the private and corporate business jet community, including an in-house fleet of 30 Business Aircraft consisting of a Boeing B-727, Gulfstream II’s, III’s and IV’s, Falcon 10s and 20s, Hawker 400s, 700s and 800s as well as Citation I’s and II’s. Threshold’s Part 145 Repair Station provides maintenance services on most Business Jets, including 72 Month Inspections on Gulfstream Aircraft. Threshold employs more than 40 full-time maintenance personnel operating in two shifts and has the capacity and capability to fulfill the most demanding maintenance requirements. Threshold also offers complete Interior Design and Completion services as we ll as avionics upgrades and aircraft painting services.

Threshold Air Charter, a subsidiary company of Threshold Aviation Group, currently operates aircraft charter services for both domestic and international travel. Threshold’s growing charter fleet currently consists of five aircraft including: two Gulfstream, two Citation II and a Falcon-10.

Most recently Threshold opened a brand new, full service FBO at Chino Airport. Threshold’s FBO was designed to give corporate aviation clients a viable alternative to Southern California’s congested airports, which are literally minutes away. Visit Threshold Aviation Group on the Web at: www.thresholdaviationgroup.com