Silvercrest

概要

The Safran Silvercrest (developed by CFM International's parent company Safran Aircraft Engines, formerly Snecma) is a medium-thrust turbofan engine targeting the large-cabin and super-midsize business jet market. Designed to produce 11,000–12,000 lbf (approximately 49–53 kN) of thrust, the Silvercrest was intended to power the Dassault Falcon 5X and Cessna Citation Longitude, occupying an attractive thrust class between the existing PW300 and Rolls-Royce BR700 families. The engine features a high bypass ratio of 5.3:1 — significantly higher than competing business jet engines of its thrust class — promising superior fuel efficiency and reduced noise signatures.

The Silvercrest program has experienced significant developmental challenges since its launch in the late 2000s, making it one of the most notable engine development difficulties in recent business aviation history. Persistent issues with the high-pressure compressor performance and certification test requirements led to repeated delays in achieving FAA and EASA certification. Most significantly, Dassault Aviation abandoned the Falcon 5X program in 2017 after determining that the Silvercrest would not meet the performance guarantees required for that aircraft, substituting the existing Pratt & Whitney Canada PW812D for the redesigned Falcon 6X instead. These setbacks significantly reduced the engine's commercial prospects.

Despite these challenges, Safran has continued to work toward Silvercrest certification, with the Cessna Citation Longitude remaining as a potential application. The Longitude entered service in 2019 using Honeywell HTF7700L engines instead, further narrowing Silvercrest's near-term market. As of the mid-2020s, the Silvercrest remains in development as Safran evaluates its strategic options for the program.

技術仕様

派生型

The Silvercrest was designed as a family covering approximately 11,000–12,500 lbf, with two primary ratings under development. The Silvercrest 2E (11,000 lbf) was targeted at the Cessna Citation Longitude in its original configuration. The Silvercrest 2C (11,900–12,500 lbf) was the higher-thrust variant intended for the Dassault Falcon 5X, capable of powering the heavier aircraft's longer-range mission profile. Both variants share the same core architecture and fan module. Safran's engine development roadmap for the Silvercrest has evolved multiple times as launch customer situations changed, and the current certification status reflects a program that has been substantially restructured since its original conception in the late 2000s.

搭載機

The Silvercrest's original target applications have undergone significant changes due to the program's developmental difficulties. The Dassault Falcon 5X was announced as the primary launch customer in 2012 but was cancelled by Dassault in December 2017 after Safran was unable to guarantee the engine performance levels required for the aircraft. The Cessna Citation Longitude was a second major application but entered service in 2019 with Honeywell HTF7700L engines after Textron Aviation concluded that waiting for Silvercrest certification posed unacceptable schedule risk. The Dassault Falcon 6X subsequently adopted Pratt & Whitney Canada PW812D engines for its similar-size successor. Safran continues to engage with potential airframe customers for future applications of the Silvercrest if and when certification is achieved.

開発の歴史

Safran (then operating as Snecma) launched the Silvercrest program in 2008, targeting a gap in the market between the PW300-class engines and the Rolls-Royce BR710. First run occurred in 2012 at Safran's Villaroche facility near Paris. The program initially progressed through ground testing with apparent success, and Dassault selected the Silvercrest for the Falcon 5X in 2013. However, performance discrepancies in high-pressure compressor efficiency emerged during certification testing, requiring extensive redesign work on the compressor aerodynamics. These redesign cycles proved more time-consuming than anticipated, generating delay after delay against the original 2016 certification target. Dassault's 2017 decision to cancel the Falcon 5X was a severe blow to the program's commercial viability and generated substantial reputational impact for Safran in the business aviation community. The French aerospace industry and French civil aviation authority (DGAC) have since worked with Safran on a revised certification approach. The Silvercrest case is now studied as a cautionary example of the risks inherent in committing to new engine development with parallel airframe programs before sufficient technological maturity is established in critical subsystems such as high-pressure compression stages.