Now we are two doing the same exercise in the SIM, went through all the books and couldn't find an explanation, except a wild guess.... the EEC'S compute the thrust limits based between other things on pack configuration, well here we have an EEC calculating for a pack off limit thrust and the other one for a pack on conventional take off, therefore asymmetric thrust limit on a performance limited take off, am I anywhere close to the answer? hope someone can clarify with more substance...