Beoing has issued a far-reaching notice to customers regarding its B777 aircraft fitted with Rolls-Royce Trent 800-series engines as a result of a second engine power loss on a B777 following one that caused a hard landing in London last year. The fuel temperature in more than 200 B777s with should not be allowed to remain at -10 degrees Celsius or colder in flight after two hours, one hour less than previously advised, Boeing Co. told customers in a notice issued 29 January. After two hours, pilots are told to reduce altitude, which can result in slower air speeds and increased fuel consumption.