How do i use this performance graph

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To plan a flight from Heathrow to Glasgow, the user needs to calculate time, fuel, and distance for the initial climb and departure. They are using a performance graph from an aircraft manual but are unsure how to interpret a pressure altitude of -187 feet. It is advised to treat -187 feet as 0 feet on the graph since both are indistinguishable. Additionally, the Professional Pilots forum is suggested as a resource for technical questions. Utilizing these insights will aid in accurate flight planning.
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So i have an assignment to plan a flight from Heathrow to Glasgow and I am 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
 

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0 feet and -187 feet are indistinguishable on the scale of the graph, just use 0.
 
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mfb said:
0 feet and -187 feet are indistinguishable on the scale of the graph, just use 0.
Ah okay i had thought that might be the case but wasnt sure. Thanks very much!
 
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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