XAM2175 wrote:QF's use of the RB-211 on the 747 and 767 fleets wasn't comprehensive or overly deliberate - the 747-438s carried RR engines but the 767-338ERs had CF-6s. Only the six 767-336ERs QF bought from BA had RR engines.
LH707330 wrote:Funny how there used to be three WB engines in a given decade that most of the frames used, and now we've got unique engines for each airframe and a 1:1 pairing of engines and airframes. I guess it's a consequence of a) planes in the past being designed around the most powerful engines around, and b) wanting to optimize every last percentage point.
IIRC ANZ did the same thing with their 767/747 fleets. Because the range of the 744 was so much better, they put the better ones on the 76, and as they got older, they went on the 74. Why they had a mixed RR/GE 744 fleet is a mystery to me though.
strfyr51 wrote:United flew the PW4000 on both the B747-422 and B767-322, We did interchange engines. We did not interchange engines wih the B747-222 and the B767-222's they were both JT9D-7R4 But one was the 7R4D, and the other was the 7R4G. I guess the idea didn't occur while we had that series of Airplane/Engine combo.
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