Fuel heat
I flew the B747-200/300 and later the B744 series, last flight was close to 10 Years ago so some things are getting faint.
We had a discussion last night about the fuel heat system of the P&W engines on the 200 series. We used it a lot on wintery nights, was a good issue to keep the F/E off the street as it needed constant attention in low OAT's
Once it was really cold and for some reason the F/E let his guard down, suddenly two of the Pratts started accelerating uncontrolled.
I was quick to pull back the levers and they responded and so we could avoid an engine overspeed. With heaters on they quickly recovered to normal ops.
Later with the GE CF6 on both the 300 and 400 series it was not needed any more. I completely forgot how this was solved on those heavenly good engines. (in 18000+ hours I never "lost" an engine.....I am forever grateful to GE for that design)
Is the heating done automatically or does the CF6 plumbing and control not require it?