Originally Posted by
Turbavykas
CRJ200 for example has non FADEC engine and only N1, N2 and ITT gauges and is flat rated to 23 degrees C. If I operate from the airport where temperature is -20 and I accidently put 20 into the FMS for N1 thrust calculation will I get any information that something is wrong and engine parameters are exceeded during takeoff roll? As I understand N1 will stay in the green range ITT will be in a green range too but certified engine thrust rating will be exceeded without any cockpit indication? Is there any risk associated with a such mistake except takeoff path looking more like F16 is departing?
Rotor speed gauges will typically only indicate a red line exceedance, not a rating exceedance. Pretty much by definition, hydromechanically controlled engines don't know if they are being overboosted and are only protected against rotor speed and burner pressure red line exceedances.
Any sort of warning that you've exceeded the engine rating on non-FADEC (or a FADEC operating in alternate mode) would need to come from the aircraft side (FMC or similar). Not familar with the CRJ, but on most Boeing models, when operating N1 engines in Alternate mode, there is an EICAS caution message if you exceed the max rated N1 by more than 2% (as calculated by the FMC based on aircraft sensed Total Temp - not any manually input temp).