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How do i use this performance graph

  1. Aug 6, 2017 #1
    So i have an assignment to plan a flight from Heathrow to Glasgow and im trying to calculate the time fuel and distance for the inital climb to cruise level and departing the airport, we have been given an aircraft manual and i have found the graph attached however i have calculated the pressure altitude at Heathrow to be -187 feet so how do i use the graph, any ideas? Thanks
     

    Attached Files:

  2. jcsd
  3. Aug 6, 2017 #2

    mfb

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    2016 Award

    Staff: Mentor

    0 feet and -187 feet are indistinguishable on the scale of the graph, just use 0.
     
  4. Aug 6, 2017 #3
    Ah okay i had thought that might be the case but wasnt sure. Thanks very much!
     
  5. Aug 6, 2017 #4

    CWatters

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    Science Advisor
    Homework Helper

    Just for info.. You might care to check out the Professional Pilots forum

    http://www.pprune.org

    I expect they have a section where tech questions can be asked.
     
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