The Safran Silvercrest was a French turbofan unsuccessful development intended to power the Dassault Falcon 5X and Cessna Citation Hemisphere. A project of Safran Aircraft Engines, it did not meet the requirements for either aircraft program and was cancelled while still in the development stage.
The Silvercrest was announced at the 2006 National Business Aviation Association convention.
The first engine went to test in September 2012. Flight testing started in July 2014 on a Grumman Gulfstream II at [Lackland Air Base, San Antonio, Texas]. Later, in 2017 moved to Istres-Le Tubé Air Base. Problem areas disclosed at the time included high-pressure compressor operability, oil-fuel heat exchanger performance, carcass distortion and turbine tip clearance control.
In December 2017, Dassault abandoned the Silvercrest due to technical and schedule risks. It terminated the 5X program and launched a new Falcon with the same cross section, Pratt & Whitney Canada engines and a range for a 2022 introduction.
In July 2019, Textron suspended the Cessna Citation Hemisphere development due to engine shortcomings.
It was originally designed as an thrust turbofan. It was meant for large-cabin business jets and 40 to 60-seat regional jets with a maximum takeoff weight of . In 2016 the thrust range was quoted as .
The two-shaft engine included a fan with solid wide-chord swept blades, followed by 4 booster stages, all driven by a 4-stage low pressure turbine. The high pressure spool had 4 axial compressor stages and 1 centrifugal stage, driven by a single-stage turbine. An axi-centrifugal compressor was unusual for an engine with more than 10,000 lb thrust.
A related design in 2007 used a smaller 40-inch fan with a lower 4.5 bypass ratio, no booster, an extra high-pressure compressor stage, one less low-pressure turbine stage, a 27:1 overall pressure ratio and a core pressure ratio of "over 17".