Simultaneously the speed must be reduced from 180 kt to 137 kt which, in terms of energy, is equivalent to 600 ft height....
HN39,
If, in fact (
TBD), 180 was requested to some point (the bridge?)....
....is it the equivalent extra energy that's of real significance, or the remaining time/distance to dissipate it that is important?
I don't believe you're implying that any necessary speed reduction could not be conducted at a 3.4 degree FPA? (which is of course operationally different from flying a constant 4.5 degree FPA at a constant 137 KCAS)
Are you?
Can the plane do that or not?
It's done at least a couple of times every week in 777s from Heathrow non-stop to San Diego with no ILS GS available, a 3.5 degree PAPI and a declared LDA of 7591'.
The real question is can the pilot do it?