Two waypoints after activating FPL on approach

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   I’ve noticed this behavior for some time, but was asked a question about it today and didn’t know the answer.

I’m flying a flight plan to a destination airport. Prior to arriving, I add via the PROC key an RNAV approach with an appropriate IAF. I continue to navigate normally, with my next waypoint active, and then a “fence” followed by the first segment of the approach. I have the soft key “activate approach” available.

If I activate the approach, the FPL removes the “fence”, and the resulting flight plan has the current waypoint, followed by the IAF. It then shows the approach, with the first waypoint repeated. The second copy of the waypoint has an altitude restriction, while the first does not.

If I select the second waypoint and activate it, the IFD changes into GPS->LNAV+V. If I do not, when I reach this waypoint, the IFD cycles to the next waypoint in the approach, and the GPS->LNAV+V appears.

Why, when I activate the approach, does it not just sequence to the IAF and arm the GPS->LNAV+V?

Thanks!

P.S. The IAF in this example has an altitude higher than I’m flying at. I don’t know if this is related somehow, just providing it for complete information. 

Edited by Melohn - 16 hours 28 minutes ago at 7:38pm

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Melohn Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 11 Dec 2013 Location: PHNL Status: Offline Points: 145	Post Options Post Reply Quote Melohn Report Post Thanks(0) Quote Reply Topic: Two waypoints after activating FPL on approach Posted: 16 hours 34 minutes ago at 7:32pm
	I’ve noticed this behavior for some time, but was asked a question about it today and didn’t know the answer. I’m flying a flight plan to a destination airport. Prior to arriving, I add via the PROC key an RNAV approach with an appropriate IAF. I continue to navigate normally, with my next waypoint active, and then a “fence” followed by the first segment of the approach. I have the soft key “activate approach” available. If I activate the approach, the FPL removes the “fence”, and the resulting flight plan has the current waypoint, followed by the IAF. It then shows the approach, with the first waypoint repeated. The second copy of the waypoint has an altitude restriction, while the first does not. If I select the second waypoint and activate it, the IFD changes into GPS->LNAV+V. If I do not, when I reach this waypoint, the IFD cycles to the next waypoint in the approach, and the GPS->LNAV+V appears. Why, when I activate the approach, does it not just sequence to the IAF and arm the GPS->LNAV+V? Thanks! P.S. The IAF in this example has an altitude higher than I’m flying at. I don’t know if this is related somehow, just providing it for complete information. Edited by Melohn - 16 hours 28 minutes ago at 7:38pm

midlifeflyer Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 21 Aug 2021 Location: NC Status: Offline Points: 9	Post Options Post Reply Quote midlifeflyer Report Post Thanks(0) Quote Reply Posted: 4 hours 4 minutes ago at 8:02am
	I can’t answer the second part without knowing the approach and where you were coming from so it can be reproduced in the simulator. But as a general rule, “Activate (capital A) the Approach” will take you to whatever you chose as your initial transition when you first loaded the approach, which is why many don’t ever touch it. It's not quite the same as what Garmin does in it's units, but it's problematic enough that I choose to go Direct to the appropriate fix or activate the appropriate leg as the means of activating (lower case a) the approach. Edited by midlifeflyer - 2 hours 46 minutes ago at 9:20am