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F100 - Overshot Runway at Newman Airport (9/1/2020)

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F100 - Overshot Runway at Newman Airport (9/1/2020)

Old 7th Sep 2021, 12:00
  #161 (permalink)  
 
Join Date: Jun 2006
Location: 3rd rock from the sun
Posts: 1,895
Originally Posted by 404 Titan View Post
Morno



It's not so much that FlySmart throughs it up. It's more that we ask it as it's and SOP requirement if we want to use idle reverse on a wet runway. Asking it to calculate a landing performane for Medium-Poor braking is the same as calculating a landing performance for a contaminated runway with more than 3mm of water or slush up to 13mm. In this calculation with the 1.15, it's more than the 1.67 and 1.92 dispatch calculation. Calculations for Dry and Good will be less than the pre Dispatch calculations.
Gotcha, makes sense now.
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Old 7th Sep 2021, 12:41
  #162 (permalink)  
 
Join Date: Jul 2008
Location: Australia
Posts: 743
This is from the link that Buzz Box provided:

Summary
The goal of this Briefing Leaflet is enhance your understanding of the landing performance data and to appreciate the role that speed
brakes and thrust reversers play in deceleration especially when landing.
As a review:
Certified data is factored, used for dispatch purposes and does not use reverse thrust.
Advisory data is non-factored (FAA), used enroute and has always been based on the use of reverse thrust.
Speed brakes increase drag and decrease lift allowing your brakes to be considerably more effective.
Reverse thrust provides significant deceleration when landing on a critical runway; short, slippery with the braking action
reported POOR.
The bolding is mine. Can I suggest you download the document, have a good read then let us know if you still are confused.
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