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LNAV/VNAV prearming

Featured Replies

NGX already has 10.8A.

 

True. I was wrong. We already have 10.8A. :blush:

Dave P. Woycek

Hi,

it depends also by standard operation procedures

According with SOPs of an european airline flying the 738 VNAV has never being armed before flaps retraction and I follow their rules (I prearm, if it's possible (you know: if the first w/p lis 5 degrees max from rwy heading) LNAV before takeoff, use FL CHG until flaps up (i.e. I set 220 kts in the speed knob after reaching flaps retraction altitude and retract them on schedule) and after that I arm VNAV.

Ciao

 

Andrea Buono

Hi,

it depends also by standard operation procedures

According with SOPs of an european airline flying the 738 VNAV has never being armed before flaps retraction and I follow their rules (I prearm, if it's possible (you know: if the first w/p lis 5 degrees max from rwy heading) LNAV before takeoff, use FL CHG until flaps up (i.e. I set 220 kts in the speed knob after reaching flaps retraction altitude and retract them on schedule) and after that I arm VNAV.

Ciao

 

Andrea Buono

That's SOP at my airline, too. We don't have U10.8a. Hopefully we'll get U11 some time in the next few years.

Matt Cee

Doesnt alot depend on ATC departure instructions? Usually there is vectors for busy airport on the way to the SID. At least thats what im hearing when listening to departure control. Perhaps at less busy times you just fly the SID therefore LNAV and VNAV would be armed. Feel free to correct me.

CYVR LSZH 

I7-14700k 64gb 6000Mhz DDR5 ASUS  z690 ROG STRIX Gaming  RTX 4080 Super, 

Doesnt alot depend on ATC departure instructions? Usually there is vectors for busy airport on the way to the SID. At least thats what im hearing when listening to departure control. Perhaps at less busy times you just fly the SID therefore LNAV and VNAV would be armed. Feel free to correct me.

 

It just depends on the location. I have observed that a lot of US airports do seem to use vectors after departure (so more like FSX simulates) whereas where I am currently based in Europe, full SIDs are flown, to the airway transition, most often without any Radar Vectoring. Altitudes are quite often given by ATC that depart from the SID altitude constraints, but unless traffic spacing is required, radar vectors aren't used so much.

Doesnt alot depend on ATC departure instructions? Usually there is vectors for busy airport on the way to the SID. At least thats what im hearing when listening to departure control. Perhaps at less busy times you just fly the SID therefore LNAV and VNAV would be armed. Feel free to correct me.

It just depends on the location. I have observed that a lot of US airports do seem to use vectors after departure (so more like FSX simulates) whereas where I am currently based in Europe, full SIDs are flown, to the airway transition, most often without any Radar Vectoring. Altitudes are quite often given by ATC that depart from the SID altitude constraints, but unless traffic spacing is required, radar vectors aren't used so much.

It's highly variable. Some airports always use a SID. Some will give you a SID, but then clear you on a heading. Some have no tower, and you'll just navigate as filed - which may or may not be a SID. Some SIDs have vectors, and you can still use LNAV for those, if it's in the box.

 

If ATC tells you to fly a heading, you use HDG SEL. Otherwise, you're probably in LNAV.

Matt Cee

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