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Chuck Clark
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| Joined: | Mon Jan 23rd, 2006 |
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| Posts: | 4 |
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Posted: Sun Jan 29th, 2006 05:13 pm |
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As a new Chelton FlightLogic operator (2-tube system coupled with a Collins FCS-65 Flight Control System in a B200 King Air), I've been frustrated with Chelton's current heading-bug operation. If left 'hot', as is necessary with the Chelton to enable immediate use of the heading bug as most of us have become accustomed to with traditional HSI's or EFIS's when receiving ATC vectors (particularly during departure and approach), the 'hot' heading-bug on the Chelton system disables all other entry functions and freezes the control settings and inputs on both Chelton displays.
Additionally frustrating is the inability to simultaneously couple the Chelton GPS course steer output to the autopilot with the heading-bug enabled. Enabling the heading-bug over-rides the GPS roll-steer commands to the autopilot. Thus, you can't use a heading bug if you want to couple the autopilot to the GPS course.
I've been told that Chelton will be releasing a new remote 'heading & course select' control, hopefully in the not too distant future, that is supposed to overcome the 'hot heading-bug lock out' problem. Until then, I'd appreciate any advice anyone might have to make it easier to manage this problem. I've found it particularly troublesome on departure.
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rkaplan
Administrator
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Posted: Sun Jan 29th, 2006 06:49 pm |
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Do you have a backup HSI or backup DG on your airplane?
Have you considered making that the heading bug input to your autopilot?
You would need a switch to activate GPS Steering which would send GPS roll steering headings to the autopilot when GPS Steering is on and which would accept your heading bug input when GPS Sterring is off. This is commonly done for non-Chelton GPS systems so it should be possible here.
____________________
Richard Kaplan, CFII
rkaplan@flyimc.com
http://www.flyimc.com
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Chuck Clark
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| Joined: | Mon Jan 23rd, 2006 |
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Posted: Mon Jan 30th, 2006 03:12 pm |
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Thanks for the idea. My back-up Sandel EHSI isn't in the most convenient location for easy scan and bug setting and the Collins HSI-85 on the co-pilot's side is too far to scan easily although it does have a remote bug control on the pedestal. I'm hoping Chelton's promised new remote bug control and release 6 of their software will overcome the current problems. If not, I'll certainly look into your suggestion.
I very much appreciate this forum and am sure it will help a lot of folks. Thanks
rkaplan wrote:
Do you have a backup HSI or backup DG on your airplane?
Have you considered making that the heading bug input to your autopilot?
You would need a switch to activate GPS Steering which would send GPS roll steering headings to the autopilot when GPS Steering is on and which would accept your heading bug input when GPS Sterring is off. This is commonly done for non-Chelton GPS systems so it should be possible here.
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Marc
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| Joined: | Thu Jan 26th, 2006 |
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Posted: Wed Feb 1st, 2006 10:27 pm |
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I haven't driven a Chelton EFIS, so I can only comment per the manual. It looks like you can enable the heading-bug by pushing the HDG button (then pushing SYNC to start with your present course). Heading mode will stay activated if you push any other button (it says here), so you should be able to perform other tasks with the EFIS. Push HDG again to enable the heading-set knob. Push OFF with the heading knob activated to reenable leg following.
You don't want GPSS when you are following a heading, so I don't understand your comment about not having it (you couldn't, anyway, because GPSS computations are based on your future course changes, which the system can't know in HDG mode). It looks, from the manual, that HDG -> HDG-OFF are the logical equivalent of the HDG/GPSS switch in other systems.
If the manual is incorrect, please let us know. Richard, what does the sim do?
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rkaplan
Administrator
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Posted: Thu Feb 2nd, 2006 03:21 am |
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| I think the fundamental issue here is that most aircraft have a dedicated heading bug knob whereas in the Chelton system the knob to move the heading bug also serves other functions. So even if you do not want to use GPS roll steering and just want to follow ATC vectored headings, you will need at times to switch "knob modes" on the PFD to change headings vs. to do other PFD-related tasks.
____________________
Richard Kaplan, CFII
rkaplan@flyimc.com
http://www.flyimc.com
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