Nearly the same as two-engines-out on a four-engined aircraft: you lose all thrust on one side, and you need a bigger fin....
.. or you accept the usually rather higher Vmca2 ?
because the moment arm is greater on the four engine airplane.
.. but the moment involves the arm and the thrust .. the four motor bird doesn't usually have the engine thrust of the two motor bird
But this is alleviated on some aircraft by reducing power
Certification requirements usually don't allow any thrust reductions ?
You still have more than half the total thrust left.
.. except the concern is T-D, not just thrust ?