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Old 3rd Sep 2012, 23:36
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McBruce
 
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According to Boeing performance manual based on 737-800 CFM56-7B26:

Trip fuel and time charts are based on an initial climb speed of 280 KIAS. Local ATC may require that 250 KIAS not be exceeded below 10000ft. Approximately 25kg of additional fuel is burned when this restriction is imposed.
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