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Thread: 737 NG optimum flight level reduction with reducing mach no.
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Old 7th Feb 2009, 09:09
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Prop's ????
 
Join Date: Mar 2002
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Yesterday I completed an automatic FMC max rate climb to meet an ATC restriction ... the speed came back to 230 knots/0.68 mach and approaching FL350 ....ISA -10...at 69,000 tonnes the FMC optimum calculation was around 3,000' lower ( I would typically expect FL380 @ 0.78 mach in these conditions).
I’m surprised to see Max Rate climb speed so slow, normally I get 270/0.78.

Those speeds look more like Max Angle.
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