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777 Vnav Question For A Pilot  
User currently offlineSouthwest737 From United States of America, joined May 2006, 0 posts, RR: 0
Posted (15 years 3 months 2 weeks 5 days 16 hours ago) and read 6057 times:

Can a triple 7 pilot please tell me when you engage the VNAV after takeoff. Also, does it immediently control the speed?

2 replies: All unread, jump to last
User currently offlineFLY 8 From Austria, joined Dec 2000, 329 posts, RR: 0
Reply 1, posted (15 years 3 months 2 weeks 5 days 11 hours ago) and read 6030 times:

After 400 feet you can switch it on! You take off in a heading, T/O mode! Then the Vnav mode can either control speed or given altitudes in the FMS! For example. when in a descend to a specific point, lets call it ARTIP (that´s a IAF into Schipol AMS, Where you have to be at FL100 or below).
You write into the FMS where there is ARTIP on the left, the NAV side, FL100B on the right of it, where the VNAV side is. There you put in the speeds or in this example an altitude constrain. Than the airplane will fly to ARTIP and will be exactly at FL100 as long as you are in the NAV mode! But when you chance into the Heading mode in the Flight Guidance Controler, because of getting radar vectors of the controler, the airplane is unable for the Vpath mode like I described it to you before! So either you change into the Vertical Speed mode VS, or into the Vertical Flight Level Change Mode VFLCH, where the airplane holds a desired speed. In a descend it would be the maximum descend speed or a speed designed by ATC. In that case you would control the descend speed with the thrust setting.
This mode you can do in 2 different ways, either its called VFLCH or FLCH, the difference is in the VFLCH mode the speed is insert in the FMS and in the FLCH mode the speed is hold wich is set on the flight guidance control panel!

I hope, to helped you a little!


yes i can handle that alone. - - -famous last words
User currently offlineMD11Nut From , joined Dec 1969, posts, RR:
Reply 2, posted (15 years 3 months 2 weeks 4 days 22 hours ago) and read 5988 times:

To add to Fly8 excellent post, on the 777, you can arm VNAV on the ground and it will auto-engage at 400 ft. Once it activates, it immediately controls the speed. For continuity, the 777 FMS, once armed, updates the target airspeed to the higher of V2+15-25 or current airspeed. So when it takes over, the speed transition is smooth.


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