Questions tagged [vnav]

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2
votes
2answers
154 views

How to deal with both a speed and an altitude crossing restriction while in VNAV PTH descent (Boeing 737NG)?

Suppose you are in VNAV PTH descent and are approaching the IAF for your Approach, The IAF has both an altitude crossing restriction and a speed restriction. Assume that your VNAV PTH descent is at ...
2
votes
2answers
105 views

What does “transition of glideslope intercept waypoint” mean in the 737 FCOM?

In the Boeing 737NG FCOM, I've read this statement: VNAV mode is terminated by any one of the following: selecting another pitch mode glideslope capture reaching end of LNAV route transition of ...
1
vote
1answer
74 views

Does a VNAV PTH descent need the Forecast Descent winds?

If VNAV PTH, contrary to VNAV SPD, maintains a given path angle, depending on the CI chosen, and not a given Speed, then in my mind winds shouldn't affect it, since they would only cause the Vertical ...
0
votes
2answers
117 views

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 ...
2
votes
2answers
396 views

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 ...
3
votes
1answer
370 views

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 ...