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VNAV on my SR22 G2 |
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_phm_ 
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Joined: 08 May 2023 Location: brazil Status: Offline Points: 97 |
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 Topic: VNAV on my SR22 G2Posted: 24 Jun 2025 at 1:21pm |
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Hi there - I own an SR22 G2 equipped with
* IFD440 * IFD550 * Stec 55X autopilot EX5000 PFD and MFD (avidyne) From what I have learned, this stack does not allow me to use the IFD's VNAV feature. What would be the minimum upgrade that I could to in order to have VNAV? |
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Melohn
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Joined: 11 Dec 2013 Location: PHNL Status: Offline Points: 157 |
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Posted: 22 hours 60 minutes ago at 5:51pm |
VNAV is a generic term for a range of features. Using GPS guidance with vertical navigation (LNAV/VNAV) is definitely possible IF you have the correct versions of software on your PFD. There are a variety of these types of approaches, including LNAV+V and Visual approaches, both with advisory vertical guidance. Enroute vertical guidance is also possible with the IFDs, which provide both the green vertical path indicator, a Vertical Speed Required indicator, and on the IFD 550, a vertical track indicator that will allow you to navigate to preset altitudes on a per waypoint basis, either by pitch or by the VS mode of your autopilot. These altitudes are often specified in DPs and STARS, which if you load into an IFD, will be assigned to the charted waypoints. What you can’t get is the ability for your current autopilot to fly an enroute VNAV vertical track. This would require a newer autopilot, and support in the PFD which doesn’t exist. |
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_phm_
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Joined: 08 May 2023 Location: brazil Status: Offline Points: 97 |
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Posted: 6 hours 24 minutes ago at 10:27am |
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Got it.
From what you are saying, it does not make sense to change my Stec 55X to another autopilot box, because even with a new autopilot hardware the current PFD would not support an enroute VNAV vertical track. But why would that be? Isn't the autopilot who controls the servos and provide LNAV? why a new AP could not provide VNAV, as it would be fed with VNAV data from the IFD's (not the PFD)? |
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_phm_ wrote: