I tried to get this info on the other thread. Has there ever being on a 747 (or another 4 burner using turbofans) a case of multiple inflight engine failure. (Volcanic ash excepted)
The sole catch so far has being a Tristar where the problem was bad maintanence causing all three engines to head south. Presumably on a triple engine the one engine down procedure is the same as a twin - land ASAP.