chperplt
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flx757 said:enigma is in the basic ballpark, but not exactly right on a couple of the points he made.
ART (Automatic Reserve Thrust) is a fuel control function that keeps 850 lbs of thrust in reserve for use after an engine failure on takeoff, provided you are making a NORMAL power takeoff (TO selected on TRI; ART switch in AUTO). Actually you have just described a MAX POWER takeoff (T.O. on the TRI, ART switch in AUTO and Zero assumed temp) If the ART fires you will get reserve power.For a max power or flex power takeoff, the ART switch is off, therefore this reserve thrust is not available, since you are already making a max power takeoff. (A flex power takeoff is a max power takeoff at a given assumed temperature, which provides for a lower EPR setting than a normal power takeoff at the current ambient temp.) T.O. FLEX is actually a reduced power takeoff (standard power takeoff) T.O. FLEX on the TRI, assumed temp something other than zero and the ART switch off is how you get the standard power takeoff. If you loose an engine during a standard power takeoff ART does not fire, you are supposed to have enough thrust to get the job done.
Reserve Trust is called for if the TRI window has zero selected, ART switch is on and the T.O button on the TRI is selected.