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Jrlumpp 
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Joined: 08 Feb 2014 Location: NY Status: Offline Points: 47 |
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 Posted: 18 Aug 2015 at 5:17pm |
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Yes I see this but does activating GPSS change how I need to set the selector from heading to loc or nav or omni?
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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: 19 Aug 2015 at 8:39am |
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Given those options, I would use Heading mode (in GPSS submode) when flying a GPS/RNAV approach, and I would use Localizer when flying an ILS. For the ILS, I would use Heading mode (in GPSS submode) until shortly before the FAF, and switch to Localizer after the needle is alive, but before the FAF. David Bunin |
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Jrlumpp
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Joined: 08 Feb 2014 Location: NY Status: Offline Points: 47 |
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Posted: 19 Aug 2015 at 10:03pm |
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Thanks for the feedback. I went out today and flew approaches. The solution for a flawless GPS approach with my equipment ( 1970's century 3 autopilot, IFD 540, Aspen 1000) as follows: Set the approach in the 540, activate, power up the autopilot in the heading mode with GPSS engaged on the Aspen. Let it fly the approach. Just outside the FAF, set the selector from heading to localizer. It then flys the approach right to the runway centerline every time.
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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: 20 Aug 2015 at 9:38am |
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Good. If that method works well for you on a GPS approach, the same method will work for you on any approach type. As a best-practice from a human factors standpoint, I recommend you set your heading bug "forward" once you're on the final heading. That way, in a worst-case disengagement of any system or function, there is nothing that will attempt to fly the airplane away from the proper course/heading. David Bunin |
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Jrlumpp
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Joined: 08 Feb 2014 Location: NY Status: Offline Points: 47 |
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Posted: 20 Aug 2015 at 9:56am |
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oskrypuch
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Joined: 09 Nov 2012 Location: CYFD Status: Offline Points: 3058 |
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Posted: 20 Aug 2015 at 10:20am |
Although I don't need to swap to APPR from GPS with my equipment, on a GPS RNav approach, I always do so prior to the FAF. THe guidance provided is identical, but that allows for consistency for all approaches, whether LOC, VOR or RNav. And yes, heading bug should always be nulled, and course is set and checked on both the ASPEN (usually auto) and my second radio/CDI. This is part of my FAF checklist. * Orest |
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Jrlumpp wrote: