Questions tagged [vnav]

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When do the LNAV and VNAV NPS pointers appear in the PFD of a B737NG?

I am pretty sure the LNAV NPS pointer should appear from after takeoff, if LNAV is armed. But I am not sure about the VNAV NPS pointer. A VNAV climb is based on Speed, not Path, so I assume there is ...
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How does one resume a VNAV climb in a B737 NG after being instructed to level off at an altitude below the Cruise altitude?

I am referring to a Boeing 737NG. Assuming I am on a VNAV climb but I am instructed by ATC to climb only to an altitude lower than my FMC Cruise altitude. After leveling off, how do I resume my VNAV ...
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What is the difference between Level Change and ALT INTV during VNAV descent?

I'm confused between the two. During descent for 737 PMDG, I usually start a descent via ALT INTV, but sometimes the plane doesn't response to ALT INTV but responds to LVL Change instead. I need help ...