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Old 20th Jan 2007, 21:48
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FE Hoppy
 
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Thrust on the EJETS

On the Ejets the engine thrust is rated as TO1 TO2 and TO3. These are fixed ratings. They also use ATTCS and you can derate using Assumed Temp method up to 25% of the rated thrust.

In the engine failure case the FADEC will set TOX reserve thrust on the running engine. TO1 reserve and TO2 reserve are the same thrust and share the same VMCG/VMCA (V1min/VRmin) data. TO3 reserve is less and has lower VMCG/A speeds.

Its not possible to select higher than TO3 reserve until you are out of the take off phase to ensure you respect the lower VMC used in the TO calc.

But as you can see from the data VMCA(and vmcg) is scheduled according to alt, temp and weight.
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