Originally Posted by
misd-agin
Is the person using the specific 773 vs 77W code? Or using a generic short version of 773 for a 777-300 family aircraft?
At the risk of prolonging the thread drift, those are the IATA codes (see SSIM Appendix A) for, respectively, non-ER 777-300 and 777-300ER, equivalent to ICAO's B773/B77W. Neither IATA nor ICAO has a generic code that combines the two variants.
Anyway, the important question - now resolved - was whether the incident as reported involved one of Thai's B773s (all Trent-powered) or one of their B77Ws (in which case it can only have been a GE90).
It's now confirmed that it was the latter, no doubt much to Derby's relief.