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Old 10th Mar 2006, 10:10
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DFC
 
Join Date: Mar 2002
Location: Euroland
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Are you comparing the altitude you plan to fly at (based on QNH) to the "Altitude" in the cruise tables which is based on 1013 / 29.92?

Also have you allowed for a non-standard temperature at that level?

If the actual conditions are different from standard atmosphere there will be a difference in planned and actual TAS.

As to what to do for range?

Actually, that really depends more on your groundspeed/fuelflow relationship thatn TAS/fuelflow relationship.

Regards,

DFC
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