Engines
Snecma Silvercrest Engine To Feature OEI Rating
Will allow max takeoff thrust of 11,450 pounds to be available up to ISA+20 for 10 minutes.
Snecma plans to include a rated 10-minute OEI takeoff thrust at high ambient temperature for its Silvercrest turbofan, which will power the Dassault Falcon 5X. The engine is being flight tested on a Gulfstream II.
Snecma plans to include a rated 10-minute OEI takeoff thrust at high ambient temperature for its Silvercrest turbofan, which will power the Dassault Falcon 5X. The engine is being flight tested on a Gulfstream II.

Snecma’s in-development Silvercrest turbofan, which will power the Dassault Falcon 5X twinjet, will feature a one-engine-inoperative (OEI) rating for extreme hot days. To accommodate the rating, the FAA has issued a special condition called “rated 10-minute OEI takeoff thrust at high ambient temperature” (rated 10-minute OEI TOTHAT). The French engine manufacturer says this marks the first use of an OEI power rating, commonplace for helicopter turboshafts, on an airplane. The additional takeoff rating raises the exhaust gas temperature limit to augment OEI takeoff thrust in hot conditions for a maximum of 10 minutes. Thus, the maximum takeoff thrust of 11,450 pounds at sea level will be available up to ISA+20, five degrees C. above the usual ISA+15 reference temperature.


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