Originally Posted by DozyWannabe
The consensus as I understand it was that allowing high-bypass jet engines of any type and on any airliner to spool down at any point of the approach was a big no-no, and pilots of the calibre and experience of those in command on the day should have been well aware of that fact.
Not just a consensus, but a feature of all jet engines, not just high-bypass engines. The very reason for having a flight idle higher than ground idle is the spool-up time. Since the adoption in 1958 of Special Civil Air Regulation Nr. SR-422A for Turbine-Powered Transport Category Airplanes of Current Design, the 'baulked' landing climb requirement must be met with:
All engines operating at the power and/or thrust which are available 8 seconds after initiation of movement of the power and/or thrust controls from the minimum flight idle to the takeoff position