That's the main engine cut-off when the shuttle's engines turn off and you're in orbit.

NPR: Former Astronaut on NASA Risk Assessment

In the biggest high-profile incident in the U.S. in recent years, more than 3, 000 passengers aboard the Carnival Splendor were towed to shore in 2010 by a Mexican tugboat after an engine-room fire cut off the ship's electricity.

WSJ: Cruise Operators See Shares Fall, Defend Safety

When the rocket at last blasted off on November 15th, the first-stage engine cut out prematurely, forcing the ground crew to destroy it for safety reasons.

ECONOMIST: The land of disappointments