IFR Missed Approach Method

[CaptRJM]

I recently upgraded the avionics in my 231.  I now have a GTN 750, KFC 200 and DAC-31 GPSS Steering.  Everything works perfectly in route and on IFR Approach.  The issue I'm having is executing a missed approach and having the autopilot fly to the hold.  I can't seem to figure out the proper sequence once I'm at the MAP and decide to fly the published missed.  I've tried several things but the only procedure that works is for me to disengage the autopilot, initiate a climb then engage the autopilot.  I would think hitting the Go Around Button on the Autopilot would do more than just provide positive pitch guidance on the Flight Director Command Bars.  Thankfully, this has only been in a training mode in VFR weather, not hard IFR at the minimums.

Does anyone else have a similar set-up as mine and can share some advice? 

[donkaye]

44 minutes ago, CaptRJM said:

I recently upgraded the avionics in my 231.  I now have a GTN 750, KFC 200 and DAC-31 GPSS Steering.  Everything works perfectly in route and on IFR Approach.  The issue I'm having is executing a missed approach and having the autopilot fly to the hold.  I can't seem to figure out the proper sequence once I'm at the MAP and decide to fly the published missed.  I've tried several things but the only procedure that works is for me to disengage the autopilot, initiate a climb then engage the autopilot.  I would think hitting the Go Around Button on the Autopilot would do more than just provide positive pitch guidance on the Flight Director Command Bars.  Thankfully, this has only been in a training mode in VFR weather, not hard IFR at the minimums.

Does anyone else have a similar set-up as mine and can share some advice? 

Please read Section 6.6 Revision N of the GTN 750 Pilot's Guide.  If you have further questions after reading that, come back and ask away.

[kortopates]

Have you unsuspended the GTN-750 by activating the Missed Approach (at any time before, at or after the MAP)?

Have you switched the KFC-200 from APPR mode back to HDG mode with the GPSS in GPS mode to enable the GTN outputs to direct the AP on the missed? 

[PTK]

5 hours ago, CaptRJM said:

I recently upgraded the avionics in my 231.  I now have a GTN 750, KFC 200 and DAC-31 GPSS Steering.  Everything works perfectly in route and on IFR Approach.  The issue I'm having is executing a missed approach and having the autopilot fly to the hold.  I can't seem to figure out the proper sequence once I'm at the MAP and decide to fly the published missed.  I've tried several things but the only procedure that works is for me to disengage the autopilot, initiate a climb then engage the autopilot.  I would think hitting the Go Around Button on the Autopilot would do more than just provide positive pitch guidance on the Flight Director Command Bars.  Thankfully, this has only been in a training mode in VFR weather, not hard IFR at the minimums.

Does anyone else have a similar set-up as mine and can share some advice? 

Once you reach the MAP automatic waypoint sequencing stops in anticipation of you landing. A message pops up asking for your input: remain suspended or activate missed approach sequencing. If rw environment is visible and you've decided to land select remain suspended or wait till after you land to do it. If not landing select missed app sequencing. You DAC must be in gps mode and ap back in hdg.

Think of it as all the wpts of the entire approach including missed segment is active and auto sequencing. The GTN auto suspends the sequencing at the MAP to allow you the option to land or not. 

[jetdriven]

  You would think a $16,000 box would know that you've not landed when showing 100+ knots past the departure end of the runway and climbing too.  The avidyne box does. 

It's annoying to have to do two button pushes to have a resume navigating

Edited March 3, 2017 by jetdriven

[kortopates]

30 minutes ago, jetdriven said:

  You would think a $16,000 box would know that you've not landed when showing 100+ knots past the departure end of the runway and climbing too.  The avidyne box does. 

It's annoying to have to do two button pushes to have a resume navigating

What if you're circling? Can the IFD recognize the difference and not resume sequencing?

Honestly I thought these kind of protocols where from the FAA, at least that's what Garmin has indicated over similar things they have changed over the years. 

[jetdriven]

Idk. That's a good question. But what if the airport has two LPV's to two different ends of the one-runway airport you are flying to? There wouldn't be a need to circle as there is an approach to each end. The Garmin box has this data. 

[kortopates]

50 minutes ago, jetdriven said:

Idk. That's a good question. But what if the airport has two LPV's to two different ends of the one-runway airport you are flying to? There wouldn't be a need to circle as there is an approach to each end. The Garmin box has this data. 

True, but if the weather isn't low and still daylight, and I am coming in from the opposite direction to the landing traffic, I'll routinely ask for an approach to the opposite runway closer to me and then just circle to the landing runway for landing along with everyone else. That way I'll avoid flying past my destination to join the approach 5-10 miles out. If its not busy I may not get that, but I often do and it saves a few minutes.

I haven't seen how the IDF boxes sequence to the missed yet, but you have me curious. 

[PTK]

2 hours ago, jetdriven said:

  You would think a $16,000 box would know that you've not landed when showing 100+ knots past the departure end of the runway and climbing too.  The avidyne box does. 

It's annoying to have to do two button pushes to have a resume navigating

It's a one button push and that's if I want to go missed which is nothing. Going missed isn't the only option either. So personally I prefer to be in the loop positively engaged this way. It knows my intentions with no surprises.

[jetdriven]

It's two button pushes, both  to unsuspend but It asks you twice. I prefer to be kept in the loop as well but I don't want to have to push a glass screen button in 2 different places while low to the ground on a missed approach. Especially when the box knows that I'm not landing.

and another thing  Pete,that thing of yours has a go-around button, doesn't it? Why can't they wire it to that?

Heres the IFD540.  No action required. 

 

Edited March 4, 2017 by jetdriven

[CaptRJM]

The issue is not with the GTN 750.  It accurately displays the message to "Activate Missed Approach" and "Remain Suspended / Unsuspended"  My issue is with the KFC 200 and DAC 31.

During the approach the KFC 200 is in Approach mode and DAC 31 in GPS.  In using the DAC 31 you select GPS if you want automatic sequencing of waypoints or Heading if you want to follow the bug on the HSI.  The KFC 200 is always in Heading mode unless you are flying an approach.

Is the thought to simply switch the KFC 200 mode from Approach back to Heading once I activate the missed approach on the GTN 750?  Will the Go Around button on the KFC 200 do anything other than give me manual pitch guidance?

[ArtVandelay]

It's two button pushes, both  to unsuspend but It asks you twice. I prefer to be kept in the loop as well but I don't want to have to push a glass screen button in 2 different places while low to the ground on a missed approach. Especially when the box knows that I'm not landing.

Try it again but delay pushing the AMA button until past the runway and above 496'. I don't remember doing this with the real box, but I never push buttons down low at minimums, I reconfigure for climb and I climb to pattern altitude before doing anything, I memorized the MAP as part of preparation so I don't need the box, the AP/GPS should automatically continue on your current heading. It looks to me it's a warning to climb because there is a charted obstruction 397' just north of the runway.