"Descend to and Maintain FLXXX"
Trying to find specific guidance from the AIM or the FARs regarding descent rates when given the above ATC instruction (In the US anyway). Both sources cited refer to optimum rates of descent (which I have always understood to be atleast 1500 fpm for us jet types). Some FOs I have flown with reach for the Alt Intv button, giving only 1000 fpm, an insufficient ROD I believe.
Anyone?