Yes don't count on 4 saving the bacon.
The aircraft was on a scheduled domestic passenger service flight from Karratha to Perth
at Flight Level 310 (31,000 ft). As the aircraft entered cloud while diverting around a large
thunderstorm, there was a sudden and significant rise in the outside air temperature. A
short time later, all four engines progressively lost power and the aircraft was unable to
maintain altitude. During the next 17 minutes, numerous attempts to restore engine power
were made without success until, approaching 10,000 ft altitude, normal engine operation
was regained.
At 2051.43 hours, the crew transmitted a Mayday call advising that the aircraft was passing
FL 190 in an emergency descent, unable to maintain altitude, and heading for Meekatharra.
The purser was then briefed to prepare for a forced landing in approximately 12 to 15 minutes.