PPRuNe Forums - VNAV Descent Speed Planning?

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shockwave1973

23rd April 2010 16:01

VNAV Descent Speed Planning?

May someone please help to let me comprehend why VNAV will not command an economy target speed greater than 349 knots (VMO/MMO minus 16) or a pilot entered speed greater than 354 knots ( VMO/MMO minus 11) on the B747-400? I do not understand the logic behind it. Thanks in advance!

Intruder

23rd April 2010 16:44

Maybe because the VNAV function nominally allows speed to vary +/- 15 KIAS to stay on the VNAV path in the descent...

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