Self explanatory title, how do i set up the descent profile in vnav on the learjet45 uns1.
Ive already read all the aerofly tutorials and the uns1 one doesnt explain this
How do you set up Vnav the descent profile on UNS1 in lear 45
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- Official Post
I don't think editing the VNAV profile in the UNS1 is implemented yet, I actually don't remember hehe...
The VNAV profile is therefore always going to be the default profile as defined by the arrival or approach and the aircraft can fly this as well.
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I don't think editing the VNAV profile in the UNS1 is implemented yet, I actually don't remember hehe...
The VNAV profile is therefore always going to be the default profile as defined by the arrival or approach and the aircraft can fly this as well.
How do you make the aircraft fly the approach? I fly with all assists (except rudder assist because rudder on the switch is bad) and so I don’t really know what I need to be switching to make the autopilot fly the approach and do the descent. I have it set to follow nav and it gets to top of descent and the plane doesnt start descending.
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I don't think editing the VNAV profile in the UNS1 is implemented yet, I actually don't remember hehe...
The VNAV profile is therefore always going to be the default profile as defined by the arrival or approach and the aircraft can fly this as well.
Gonna shoot my shot at asking since you replied, is there any chance in the future that switch will feature a cursor we can aim at switches and knobs to use them so that i can play in docked mode
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The current vnav system in the Learjet just about works for descending, following alt constraints. For non precision approaches, while in the real world vnav would also normally be used, I would just use v/s based on the chart glidepath.
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How do you make the aircraft fly the approach? I fly with all assists (except rudder assist because rudder on the switch is bad) and so I don’t really know what I need to be switching to make the autopilot fly the approach and do the descent. I have it set to follow nav and it gets to top of descent and the plane doesnt start descending.
Make sure to set a lower altitude before reaching the t/d point shown on the nd. Arm vnav by pushing the button. For ils approaches, there is a tutorial on the aerofly website.
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Post by ChuckMcPhuck (
April 1, 2026 at 2:29 AM ).This post was deleted by the author themselves (April 1, 2026 at 3:30 AM ). -
- Official Post
Switch the navigation source to FMS and then press the autopilot APR button to arm it. After intersecting the lateral and vertical profile the autopilot should follow the LNAV/VNAV approach path.
Tutorial for these kinds of autopilots (Learjet 45, King Air C90, Dash8-Q400...):
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Pressing the apr button will do nothing but show CAT 1 on the pfd if the runway also has an ils. The vnav works the same regardless if the apr button is pressed.
It is also an issue that on airbus pressing the appr button will make the aircraft attempt to fly the ils rather than final app, even if the ils hasn’t been tuned.
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Switch the navigation source to FMS and then press the autopilot APR button to arm it. After intersecting the lateral and vertical profile the autopilot should follow the LNAV/VNAV approach path.
Tutorial for these kinds of autopilots (Learjet 45, King Air C90, Dash8-Q400...):
I thought the APR button is only like for final approach 10-15 miles before touchdown. Are you saying I need to press the APR and VNV button on the autopilot before i reach the top of descent at 31,000 feet? Or do i stay in nav until my final leg?
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Pressing the apr button will do nothing but show CAT 1 on the pfd if the runway also has an ils. The vnav works the same regardless if the apr button is pressed.
It is also an issue that on airbus pressing the appr button will make the aircraft attempt to fly the ils rather than final app, even if the ils hasn’t been tuned.
Thank you, this is just an issue in the game? This basically means dont press the APR button?
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- Official Post
First you descent down to the altitude to intercept the final approach glide path, this is typically 2000 or 3000ft above field elevation. For this you select that altitude on the autopilot and then use VNAV, FLCH or VS.
Once you are close to the final approach segment you arm the approach. Once the approach is captured you can change the selected altitude.
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First you descent down to the altitude to intercept the final approach glide path, this is typically 2000 or 3000ft above field elevation. For this you select that altitude on the autopilot and then use VNAV, FLCH or VS.
Once you are close to the final approach segment you arm the approach. Once the approach is captured you can change the selected altitude.
And for this last part what would you change the selected altitude to?
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- Official Post
To what ever the approach plate of the airport officially says... If you're not looking at that then you could use e.g. field elevation + 2000 or 3000ft again (rounded to next 1000ft or so). If it's mountainous then higher than the mountain tops around you.
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To what ever the approach plate of the airport officially says... If you're not looking at that then you could use e.g. field elevation + 2000 or 3000ft again (rounded to next 1000ft or so). If it's mountainous then higher than the mountain tops around you.
So does this mean that the vnav descent takes you below your glideslope for final approach, and then pressing approach button transitions you over to the ils glideslope?
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- Official Post
VNAV only takes you down to the selected altitude usually. Only after you pressed the approach button does the aircraft descent below the selected altitude in VNAV mode.
To make this distinction more obvious many other aircraft do not call both modes "VNAV". Airbus calls is DES and FINAL to make it clear that the selected altitude will be ignored now.
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VNAV only takes you down to the selected altitude usually. Only after you pressed the approach button does the aircraft descent below the selected altitude in VNAV mode.
To make this distinction more obvious many other aircraft do not call both modes "VNAV". Airbus calls is DES and FINAL to make it clear that the selected altitude will be ignored now.
Should i turn the vnav button off when i press the approach button
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- Official Post
Should i turn the vnav button off when i press the approach button
No, when you're already in LNAV/VNAV and when you press the approach button with the navigation source on FMS then it should just activate the approach mode. Usually you're flying an ILS approach though, that's more common. Then you'll first have to switch to HDG and altitude or some other vertical mode, then switch navigation source to NAV/ILS and then when course, frequency, etc. is set and needles on the HSI are satisfactory you can arm the approach with the approach button, as described in our tutorial:
