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Old 01-28-2017, 08:38 AM
  #1  
New Hire
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Joined APC: Jan 2017
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Default Runway analysis chart interpolation

I'm not sure if this is the correct forum to post this thread in. Does anybody know how to interpolate? The numbers below are from a runway analysis landing chart. In the instructions I was given, they somehow got 195.000 pounds as the approach climb limit with an outside air temperature of 8 degrees Celsius. What is the actual formula for getting this answer?

Temp (c): -20 / 19
Climb WT: 209.1 / 190.0
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Old 01-28-2017, 11:10 AM
  #2  
New Hire
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Temp (c): -20 / 19
Climb WT: 209.1 / 190.0

I think I more or less figured it out with the six step process below:

1. -20 – 19 = 39

2. 19 – 8 = 11

3. 11 / 39 = 0.28

4. 209,100 – 190,000 = 19100 lbs

5. 19,100 * 0.28 = 5,348

6. 5348 + 190.000 = 195,348
Its not exactly 195,000 pounds but its pretty close, which means I must be doing something right.
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