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IFDx40 VNAV |
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Phidoug 
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Joined: 01 Jun 2017 Location: Stockton, CA Status: Offline Points: 17 |
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 Topic: IFDx40 VNAVPosted: 01 Jun 2017 at 11:53pm |
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I'm a recent convert from a 530W. In IFD land, is there something similar to the 530W's VNAV button that gives vertical speed to waypoint? I'm aware of the IFD's 'cross waypoint at/above....' and TOD marker on map, but looking for something similar to VNAV. Thanks!
Edited by Phidoug - 01 Jun 2017 at 11:53pm |
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Ibraham
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Joined: 21 May 2016 Location: KHWO Status: Offline Points: 357 |
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Posted: 02 Jun 2017 at 12:02am |
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VSR (Vertical speed required), it can be added to any of the blocks in the AUX/System setup
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MarkZ
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Joined: 05 Sep 2015 Location: 0TX0 Status: Offline Points: 172 |
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Posted: 02 Jun 2017 at 7:42am |
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VSR, if I'm correct, only works in conjunction with a selected arrival or approach in the flight plan. It would be nice to have this feature for vertical guidance.
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Gring
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Joined: 30 Dec 2011 Location: Kingston, NY Status: Offline Points: 720 |
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Posted: 02 Jun 2017 at 7:56am |
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Mark,
The IFD has a function similar to the VNAV in the GNS430 units, however, it works differently and it works better. The GNS430 VNAV function is a global value and is selectable on only one waypoint at a time. The IFD540 VNAV function can be set on any/all waypoints in the flight plan using similar constraints as the GNS430 ie altitude and distance from the waypoint. Setting the constraint gives you two things; A TOD marker on the moving map and a CAS message countdown when reaching the TOD point. In addition, you can set up a VSR datablock the same as in the GNS430, except, you can place the VSR in almost any location - on the side, on the top, or along the right side datablock pull out. The Pilot guide has a good explanation on how it works, the datablock chapter explains what the datablock will show, and the simulator is good at trying out the feature. Furthermore, when you load an arrival or approach (or departure) it will automatically add the VNAV constraints to the waypoint, set the VSR datablock, and provide CAS messages on each and every waypoint with the constraint. The only thing it does not do that the VNAV function in R9 does is that the IFD will not instruct the autopilot to descend.
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ddgates
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Joined: 12 Aug 2011 Location: Deer Valley Status: Offline Points: 1100 |
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Posted: 02 Jun 2017 at 10:26am |
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Nice summary, Gring!
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David Gates
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oskrypuch
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Joined: 09 Nov 2012 Location: CYFD Status: Offline Points: 3058 |
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Posted: 02 Jun 2017 at 10:33am |
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Yes, the IFD's vertical advice is so completely superior to the GNS/GTN, and a real joy. Gring has a great summary.
You can think of it as a G VNav function, but available (simultaneously) on every waypoint, and on many it is set up for you automatically.
* Orest |
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ddgates
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Posted: 02 Jun 2017 at 10:59am |
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With one exception.
Storability of VNAV limitations was added to 10.2 flight plans, however, you can put a restriction on an active flight plan, but under certain circumstances, it won't save. The pilot guide explains this.
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David Gates
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DavidBunin
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Joined: 20 May 2015 Location: Rockwall, TX Status: Offline Points: 742 |
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Posted: 02 Jun 2017 at 1:59pm |
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David G,
I only found one page in the pilot guide addressing vertical constraints (page 2-16). I am interested in more information about storing vertical constraints in routes. Can you point me to the appropriate section of the PG, or describe it here in more detail? David B |
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ddgates
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Posted: 02 Jun 2017 at 3:29pm |
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David B:
1. Like your name. 2. From Page 2-41 of the 10.2 pilot guide: "Prior to Release 10.2.0.0, no manually entered altitude constraints were saved. The database contains altitude constraints for SIDs, STARs, and approaches, and those have always been retrieved from the database when a stored route is loaded. Starting with Release 10.2.0.0, the system will save manually entered altitude constraints, but only for direct legs. If you’ve manually entered or changed an altitude constraint on a leg within a published procedure (SID, STAR, Approach, or Airway), those changes will not be saved." What is germane is the "only for direct legs". You can put a constraint on your flight plan for example on a waypoint that is part of an airway, but when it saves, the airway does but the altitude does not. Try it, you'll see. David G.
Edited by ddgates - 02 Jun 2017 at 3:36pm |
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David Gates
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MarkZ
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Posted: 02 Jun 2017 at 7:57pm |
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Goose me, I'm paralyzed..... I want to be 1000' above field elevation 3 miles out. How do I set that up?
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ddgates
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Posted: 02 Jun 2017 at 8:12pm |
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That's easy.
On your flight plan in FMS mode in expanded size: select the destination airport. You can then select XX miles either at, before, or after and at, above, or below, a defined altitude. Example: waypoint KPHX, 10 miles before KPHX, at 2500 feet. From the 10.2 PG "ADDING A VERTICAL CONSTRAINT
On virtually every waypoint, you can elect to assign a vertical constraint (e.g. cross the waypoint at or above a specific altitude, be at a specific altitude a specified distance prior to the waypoint, etc). This is accomplished by ensuring an edit cursor surrounds the waypoint of interest to select the waypoint and then either use the bottom right inner knob or touch the desired field to highlight one of the vertical constraint fields of the flight plan leg. Push the knob and enter the desired value or double tap the field to display a virtual keypad. This can be accomplished at any time on the ground or in-air and are depicted on the map display as well." Vertical Constraint Choices
" End quote Not mentioned in the above is that the distance relationship can be at, before, or after (as in the case of an intermediate waypoint). Easy peasy. You can play with it on the sim or execute it on the IFD100. Edited by ddgates - 02 Jun 2017 at 8:18pm |
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David Gates
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Gring
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Joined: 30 Dec 2011 Location: Kingston, NY Status: Offline Points: 720 |
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Posted: 02 Jun 2017 at 8:39pm |
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The difference here is that with the GNS430, you set up the VNAV as a global value and it is saved over the power cycle(s). In the IFD540, because you can set VNAV on any waypoint you set up the waypoint in the flight plan and it is not saved over power cycles with the exception of saved routes as explained above. Try it on the simulator, it is very easy.
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MarkZ
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Posted: 02 Jun 2017 at 8:48pm |
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Got it! Thank you. What a great piece of equipment!! The key is the flightplan in the expanded mode. Thanks again, and, the trainer is priceless for helping this dumb hick to figger this stuff out.
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ddgates
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Joined: 12 Aug 2011 Location: Deer Valley Status: Offline Points: 1100 |
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Posted: 02 Jun 2017 at 9:22pm |
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I have to say that I think altutide planning is one of the best features of the IFD.
Kind of an enroute cheat sheet if you set it up that way, |
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David Gates
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ansond
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Joined: 12 Nov 2009 Location: Austin, Texas Status: Offline Points: 145 |
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Posted: 02 Jun 2017 at 11:56pm |
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I really like this feature... I can set mine, then my IFD will show a TOD on the map where its suggested that I begin my decent... freakin' awesome.
Love my IFDs... they are fantastic. Thanks Avidyne!! Doug N208LG
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DavidBunin
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Joined: 20 May 2015 Location: Rockwall, TX Status: Offline Points: 742 |
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Posted: 03 Jun 2017 at 7:09am |
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So one thing I did recently was to create waypoints that are five and ten miles off the runway ends for my home field. The idea was to have a quick/easy way to paint the extended centerline in a flight plan. But now maybe I can do even more. I can save an altitude constraint of 2000' at the 5-mile points and an altitude constraint of 3500' at the 10-mile points. (The airport is at 500MSL.) That would allow me to fly a stabilized descent to the airport from beyond visual range on a hazy day. Of course, I can (and do) just use the VNAV to go right to the airport, but that doesn't put me off the end of the runway. David Bunin |
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MarkZ
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Posted: 03 Jun 2017 at 9:31am |
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Brew your own glide slope is nice. We could do that in the UNS box and did it on VFR days. If I remember correctly you could even set your own glide slope degrees without setting up fixes off the end of runway, just define a distance and intercept.
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DavidBunin
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Joined: 20 May 2015 Location: Rockwall, TX Status: Offline Points: 742 |
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Posted: 03 Jun 2017 at 11:48am |
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I know what you mean, Mark. But for the wider audience here... I want to be perfectly clear that I am NOT creating a home-brew instrument approach. I don't need that. There is a perfectly good ILS at Mesquite, and an abundance of GPS/RNAV approaches into Rockwall. The runway at Airpark East is neither long enough nor wide enough to be making approaches there. I am only trying to create improved guidance for VFR (but not great) conditions. David Bunin |
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Stiletto1
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Joined: 06 Aug 2017 Location: Texas Status: Offline Points: 70 |
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Posted: 19 Aug 2017 at 9:01pm |
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If operating VFR, who cares if you "home brew" an approach? --- FAR 91.155 Visibility Minimums (a) Class G Airspace below 1200' above the surface: 1 mile - clear of clouds (b) Class G Airspace. Notwithstanding the provisions of
paragraph (a) of this section, the following operations may be conducted in
Class G airspace below 1,200 feet above the surface: (2) Airplane, powered parachute, or weight-shift-control aircraft. If the visibility is less than 3 statute miles but not less than 1 statute mile during night hours and you are operating in an airport traffic pattern within 1/2mile of the runway, you may operate an airplane, powered parachute, or weight-shift-control aircraft clear of clouds. --- Seems to me the ability to set up an extended centerline VFR approach would be a safety enhancement when operating in, or close to, such conditions. Hope I'm not opening up a controversial can of worms with my first post. ;)
Edited by Stiletto1 - 19 Aug 2017 at 9:10pm |
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Stiletto1
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Joined: 06 Aug 2017 Location: Texas Status: Offline Points: 70 |
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Posted: 22 Aug 2017 at 6:02am |
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By the way, it looks like the next software release for the GTN's will include a form of VFR approach guidance, though this release has been delayed several months now. It is my understanding that this new feature will provide a glideslope and drive compatible autopilots. From G: Visual approach guidance Visual approach guidance is now available within the GTN 650/750, which provides advisory vertical guidance in visual flight conditions based on a published glide path angle or a three-degree glideslope from the threshold of the runway, while considering terrain and obstacle clearance. When selecting a visual approach, pilots can choose the runway of intended landing and select vectors for the final approach intercept to assist them in flying a stabilized approach. When a flight plan is loaded, the GTN will also provide a shortcut to optionally load and activate a visual approach when the aircraft is within 5 miles of the destination airport if an approach is not already selected. By utilizing visual approach guidance within the GTN, pilots are provided a more stable descent and precise flight path throughout the approach and landing phases of flight while operating in visual conditions. |
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MarkZ wrote: