If one doubt that could have happened to A330 @ FL400, dodging tropical thunderstorms above ocean, see this article bellow:
As a Qatar Airways flight dodged thunderstorms on approach to Shanghai in 2006, it encountered a problem that, until recently, was considered virtually impossible: nearly four miles above the earth, both engines of the big Airbus A330 shut down at the same time.
The engines quickly restarted and the pilots managed a safe landing. But the incident, along with similar ones before it, set off alarm bells throughout the industry because of the cause: ice inside the engines.
Modern jet engines long were thought to be impervious to internal icing. But airlines, regulators and weather scientists now think otherwise, and have been scrambling to figure out how to handle the hazard. Despite some progress, the shutdowns keep happening.
On Monday, the Federal Aviation Administration will propose new safety rules that are expected to apply eventually to about 1,200 widebody jetliners world-wide, including Boeing 747 jumbo jets. Pilots of those planes will be required to turn on engine anti-ice systems more frequently during descents, to reduce the chances of sudden shutdowns and to increase the likelihood that engines that quit will restart.
Full article here:
Airline Regulators Grapple With Engine-Shutdown Peril - WSJ.com
Neofit: "Emergency power supply = Ram Air Turbine (RAT)"
Right, but RAT doesn't power NAVSAT, and the process in order to restart the engine is speed/altitude related... something not very easy when one doesn't get reliable speed indication, neither particular training at doing it without such indications, neither being in the middle of a real thunderstorm...
S~
Olivier