Stevens Aviation tapped for Citation 550 engine retrofits

Clifford Development has appointed Stevens Aviation as an authorized installation center for the company’s certified installations of Williams FJ44-3A engines on the Cessna Citation 550 and the S550.

Clifford Development has certified 35 improvements as part of a recently issued STC, including: an Ametek digital engine display, heavy duty BFG brakes and a dual FADEC system certified to July 2007 standards. The Williams FJ44-3A engines are thermodynamically rated at 3,000 lbs. (with takeoff flat-rated thrust of 2,820 lbs.) versus the original engine’s 2,500-lbs. rating. With this modification, the typical Citation 550/S550’s basic operating weight is reduced 250 lbs.

Based on the Pilots Operating Handbook Supplement, the re-engined 550 has a 22 minute time-to-climb to FL430 versus the current one hour and 37 minute step-climb profile, an 18% increase in max cruise speed and a 59% increase in NBAA range with four passengers. The modified Citation II’s range is 2,192 nautical miles.

The re-engined Citation S550 has a four-passenger NBAA range of 2,533 nautical miles – a 55% increase, according to company officials. It also has a 17% increase in long range cruise speed with a 34% reduction in fuel cost per seat mile.

Stevens Aviation becomes the fourth Clifford Development Service Center. Stevens will provide installations at its Greenville, S.C. (GYH) location and will provide additional product support at its Denver, Colo. (BJC), and Dayton, Ohio (DAY) locations.

The Citation 550 and S550 engine conversions are priced at $2.295 million and $2.395 million for 2009 installations. The price includes engines, engine core credit, digital engine instrumentation, Clifford Development aircraft improvement package, installation labor and training.

For more information:, or

Leave a Reply

Your email address will not be published. Required fields are marked *