Vnav

[jason74]

Hi Im having problems with vnav.  If I start my flight in Turn around mode once I  take off on my flight vnav will not engage. If I start my flight with engines running vnav works. I do arm the auto throttle and FD and once the power gets to about 40% I press the toga switch. is there a switch on the overhead panel im missing?

[poodster]

Do you have a star and runway selected for your destination. VNAV also doesn't go on right after takeoff.

[jason74]

Yes I have star and runway selected for the destination and i hand fly the 737 up to 1000ft before pressing Vnav

[Litjan]

Most likely due to not having a valid E/D point, - i.e. having a route discontinuity. Or you don´t have the PERF page filled out. Or the MCP ALT is not set right. Do you get a message on the CDU when you try to engage VNAV?

I suggest you work your way through the tutorials, I am sure you will find the step you are missing there.

Jan

 

[jason74]

when i look at my flight plan there is no route discontinuity in it. it shows the TC and TD. I just tried another flight and vnav works. sometimes it works others it does not. I always check my flight plan is entered and complete. I have been flying the PMDG NGX for years so know how to enter the flight plan. I do understand the IXEG 737 vnav is a little  differant to the NGX

Edited May 31, 2016 by jason74

[Litjan]

1 hour ago, jason74 said:

when i look at my flight plan there is no route discontinuity in it. it shows the TC and TD. I just tried another flight and vnav works. sometimes it works others it does not. I always check my flight plan is entered and complete. I have been flying the PMDG NGX for years so know how to enter the flight plan. I do understand the IXEG 737 vnav is a little  differant to the NGX

Hmm, ok - very odd. Do you do consecutive flights - i.e. land, park the plane and then take off again?

Jan