Quote:BuzzBox
Adding speed constraints to the final approach waypoints is not recommended because of the extra workload, no safety benefit and reduced ability to make last minute approach changes".
When the FMC transitions to "on approach", the speed window will close, and the speed bug will move to the FMC speed.
BuzzBox,
It's quite obvious mach.865 knows how to set up the approach, what he did ask for was a better way to do this because as he pointed out it looks untidy.
1.How long would it take to insert 210kts in the FMC, less than 5 secs and how does it reduce the ability to make last minute changes?
2. Secondly whenever you select VNAV from basic modes the window always closes, you can then select speed intervention.You don't have to be in approach mode for the window to close.
3. I can see one benefit in inserting the speed he quotes 210kts in the FMC at the initial approach altitude because when leveling off at that altitude and VNAV is selected the window closes and provided the a/c is already at 210kts there is no thrust or speed increase. Speed intervention can then be employed for speed reduction. Obviously the a/c will be levelled off a few miles before the descent point.
4. From an intersest point of view do you fly the whole approach configured at Vapp or do you fly a decelerated approach, a question he also asked. The question is" simple! "