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I went missed. The IFD did not.
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SoCalIFDpilot View Drop Down
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    Posted: 20 Dec 2020 at 7:09pm
Friends - I'm a relatively new IFD 540 user, so please excuse me if this is a basic question.

Today I was flying from KCMA and flew practice IFR approach using the VOR 25 approach into KOXR. The link to the approach plate is below. I loaded the KCMA-KOXR route, and the VOR 25 approach from the FIM initial approach fix. We got vectored inside YOUBE. I'm pretty sure I activated the leg from YOUBE to CAMAT. I flew the approach and then went missed.

The IFD did not cycle to the missed approach procedure, and when I went into the FMS, I was not able to manually activate the missed procedure. The missed approach procedure was there, but it did not automatically cycle and I could not manually activate it.

Full Disclosure - It's possible when I was between YOUBE and CAMAT I highlighted and activated YOUBE. I'm pretty sure I activated CAMAT, but I am not certain.

I'm pretty sure this is a case of newbie operator error, so I'm hoping someone can explain to me what went wrong, and how I can avoid the problem in the future. (I looked in the Bauer book, and did not find an answer.)

Thanks for your help!

https://aeronav.faa.gov/d-tpp/2013/00674V25.PDF


Edited by SoCalIFDpilot - 20 Dec 2020 at 7:34pm
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dmtidler View Drop Down
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Each of the five IFD User Options has an option for "Auto Enable Missed"; I would check whether that option is "On" or "Off" for your active user. Turning this User Option "On" automatically enables the missed approach at the Missed Approach Point. If this user option is "Off", then the pilot would have to manually select "Enable Missed" when inside the FAF at 4L on the FMS - FPL page or "Activate Missed" on FMS - FPL LSK 4L if already passed the MAP. 
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Originally posted by dmtidler dmtidler wrote:

Each of the five IFD User Options has an option for "Auto Enable Missed"; I would check whether that option is "On" or "Off" for your active user. Turning this User Option "On" automatically enables the missed approach at the Missed Approach Point. If this user option is "Off", then the pilot would have to manually select "Enable Missed" when inside the FAF at 4L on the FMS - FPL page or "Activate Missed" on FMS - FPL LSK 4L if already passed the MAP. 


Very helpful. Can you tell me where to find the options so I can check?

Can you give me more information about how to "Enable Missed" or "Activate Missed?" I did not see the options while I was flying?

Thank you!!
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chflyer View Drop Down
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Have you read the manual? IMHO this is well-described and the questions are answered in the Missed Approach section of the PG, pp 6-30 - 6-32 of IFD540 rev 07.
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Originally posted by SoCalIFDpilot SoCalIFDpilot wrote:

Very helpful. Can you tell me where to find the options so I can check? 

Can you give me more information about how to "Enable Missed" or "Activate Missed?" I did not see the options while I was flying?

Thank you!!

User Options are found on the AUX - SETUP tab. The User Options should show by default when first accessing this tab; LSK 4 can be used to access the User Options if something other than User Options is displayed on the AUX - SETUP tab. There are five separate user profiles; each of them has the option to turn "Auto Enable Missed" on or off for that individual user profile.

Enable Missed or Activate Missed is only available on the FMS - FPL tab inside the FAF or past the MAP respectively if Auto Enable Missed is off. Additionally, you can visually tell if the missed approach has been enabled or not once inside the FAF on the map. Before the missed approach is enabled, the missed approach routing will appear as white dots (breadcrumbs). Once enabled, the missed approach routing will appear as normal routing (i.e. striped, white, or magenta) depending on your progress along the FPL active route.

As chflyer pointed out, a thorough reading and understanding of the IFD Pilot Guide is essential. If you have an iPad, try out questions you have from reading the PG in the Avidyne IFD Trainer app. Together, these tools can give you an incredible understanding of how the IFD functions at your own convenience. Not while trying to learn the IFD and manage an airplane at the same time.
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Originally posted by chflyer chflyer wrote:

Have you read the manual? IMHO this is well-described and the questions are answered in the Missed Approach section of the PG, pp 6-30 - 6-32 of IFD540 rev 07.


I'm a guy. Of course I haven't read the manual. KIDDING!

Thanks for the tip.
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There are other reasons why the enabled missed won’t work also.  I have that enabled but since I don’t have a baro input, that function isn’t available to me. 
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How's that? The enabled/activate missed isn't dependent upon baro input, AFAIK.

The IFD normally defines the MAP as runway threshold and this is a flight plan waypoint, even VHF, identified as RWnn (MAP). If auto enable missed is off, then passing this wpt has no effect and the IFD continues guidance on the final approach track, or until missed is manually activated. If auto enable missed is on, then the IFD will automatically sequence to the first leg of the missed approach procedure when passing the IFD flight plan MAP (not DA/DH). Even though the final approach leg of an ILS or LPV is terminated by altitude, the DA/DH location is not defined by a waypoint in the IFD and with or without baro altitude, the IFD will always sequence at the RWnn waypoint. You can check this by comparing the distance from the FAF to MAP waypoint in an IFD approach waypoint list with the distance from the FAF to the rwy threshold on the corresponding ILS IAP plate.

There are non-precision approaches, normally in mountainous areas, where the MAP is quite a distance from the RW threshold due to missed climb gradient requirements. None come to mind, but perhaps someone on the forum knows of one such. But even in that case, the MAP will be a geographically located IFD waypoint and baro altitude is not required for identification.

Baro input is required for sequencing a leg termination defined by altitude. It is not uncommon for the first leg of a missed approach to terminate at an altitude ... i.e. climb on final approach track to x'xxx ft and then turn to nnn°. Baro input is needed for the IFD to recognize this turn wpt since it does not have a fixed geographic location. 

I haven't found any definition of the IFD MAP in the PG. One just needs to be aware that the IAP MAP on an ILS or LPV approach determined by altitude (DA/DH) will not be the same location as the MAP wpt in the IFD flight plan (being RW threshold). The IFD will sequence to the first MAP leg when passing the Rwy threshold waypoint.

I would be most happy to hear from Avidyne if my understanding as above is not correct.



Edited by chflyer - 22 Dec 2020 at 4:53am
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Originally posted by chflyer chflyer wrote:

How's that? The enabled/activate missed isn't dependent upon baro input, AFAIK.

The IFD normally defines the MAP as runway threshold and this is a flight plan waypoint, even VHF, identified as RWnn (MAP). If auto enable missed is off, then passing this wpt has no effect and the IFD continues guidance on the final approach track, or until missed is manually activated. If auto enable missed is on, then the IFD will automatically sequence to the first leg of the missed approach procedure when passing the IFD flight plan MAP (not DA/DH). Even though the final approach leg of an ILS or LPV is terminated by altitude, the DA/DH location is not defined by a waypoint in the IFD and with or without baro altitude, the IFD will always sequence at the RWnn waypoint. You can check this by comparing the distance from the FAF to MAP waypoint in an IFD approach waypoint list with the distance from the FAF to the rwy threshold on the corresponding ILS IAP plate.

There are non-precision approaches, normally in mountainous areas, where the MAP is quite a distance from the RW threshold due to missed climb gradient requirements. None come to mind, but perhaps someone on the forum knows of one such. But even in that case, the MAP will be a geographically located IFD waypoint and baro altitude is not required for identification.

Baro input is required for sequencing a leg termination defined by altitude. It is not uncommon for the first leg of a missed approach to terminate at an altitude ... i.e. climb on final approach track to x'xxx ft and then turn to nnn°. Baro input is needed for the IFD to recognize this turn wpt since it does not have a fixed geographic location. 

I haven't found any definition of the IFD MAP in the PG. One just needs to be aware that the IAP MAP on an ILS or LPV approach determined by altitude (DA/DH) will not be the same location as the MAP wpt in the IFD flight plan (being RW threshold). The IFD will sequence to the first MAP leg when passing the Rwy threshold waypoint.

I would be most happy to hear from Avidyne if my understanding as above is not correct.

This is my experience as well. Prior to my airplane being equipped with a baro input, the IFD would automatically sequence to a missed approach. If the missed approach contained a leg that terminated at an altitude, the IFD would display a “Manual Sequence R’qed” caution message and a “Sequence Leg” prompt at LSK 4L on the FMS – FPL tab when that leg was the IFD active leg. Under this scenario, the IFD would not transition to the next leg until either “Sequence Leg” was selected or other manual route modification was made. All of this is well described in the IFD PG.




Edited by dmtidler - 22 Dec 2020 at 10:22am
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