The rating of a jet engine is the thrust performance that is As an example, the Pratt & Whitney Canada PT6-66D turboshaft engine has a thermodynamic rating of 1,850 horsepower, but the FCU flat rates this to a constant maximum power output from the driveshaft to 850 ESHP, which remains available all the way up to approx FL260, thereafter decreasing with an increase in altitude. The maximum available power or thrust a gas core can produce at sea level at STP is referred to as the core's thermodynamic rating. Like any other heat engine, the power or thrust produced by an aviation gas turbine (the gas core) depends on the available mass flow rate of working fluid (air in this case) as well as the operating temperature limits of the engine's hot section. Flat rating is a concept by which an engine, as stated above is restricted, in terms of power or thrust output by the fuel control unit to produce a uniform power or thrust output as the aircraft climbs or descends until the ambient air conditions will not allow the engine to operate at or beyond the maximum thermodynamic output of the engine.
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