landing distance and technique for jet certification
hi guys
having a discussion with a collegue about how the landing distance is worked out with regards to flap, thrust and speeds over threshold. for the 737 800 on certification with the test pilots
my questions to you are
(1) at what point are the thrust levers closed or idle thrust assumed for landing distance calculation?
(2) at what speed over the threshold ie 50 feet is assumed speed(ie vref)?
(3) are there any margins built into the certification data or are they exact figures (ie thrust idle, speed+-,height above threshold?
any references greatly appreciated as there is a wager involved
not putting my thoughts in as not to bias the answers!!!