My understanding is that for OEI Vls strongly correlates with Vmca, the numbers can by distilled from the FCOM. Not observing the latter is a valid reason, I am afraid.
Moreover, the EASA rules clearly spell out the acceptable tolerances for a skill test. IIRC for V2 it is plus 10 and minus 0. Even under a different regulator, that is a strong guidance. +10/-5 kt for OEI, checked the books.
Last edited by FlightDetent; 16th Dec 2019 at 10:37.