Holding Entry/Exit overshoots Holding Fix

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   Hi, 
when approaching the OSN VOR with HDG 109 (also IAF for EDDG RNP25) for a parallel entry into the holding: The magenta line is steering me to the holding fix (OSN) and AFTER passing the fix a turn anticipation occurs to intercept the outbound leg for the parallel entry, thus as the fix is handled as a must fly waypoint, what is not true.

This behavior shoots me complete into the non-holding side which is NOT safe in my opinion.

Further when exiting the holding the unit puts my to first overfly the fix BEFORE intercepting thereafter the outbound leg for the approach. This results in overshooting the outbound leg.

I have added screenshots:
RNP 25 approach chart showing the OSN holding
IFD440 screenshots from the 10.3 simulator (same behavior in my plane with 10.2 software) showing the scenario
Garmin 750 simulator screenshots showing same scenario, where intercepting is fly by and smooth (and safe)

What is correct?
A: IFD440 is correct, because holding fix MUST be handled as a must fly waypoint.
B: Garmin 750 is correct, holding fix is handled as a fly by waypoint.
C: Both A&B are correct.

Any comments on that?

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guenter_ms Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 02 Nov 2012 Status: Offline Points: 27	Post Options Post Reply Quote guenter_ms Report Post Thanks(0) Quote Reply Topic: Holding Entry/Exit overshoots Holding Fix Posted: 20 Dec 2021 at 10:36am
	Hi, when approaching the OSN VOR with HDG 109 (also IAF for EDDG RNP25) for a parallel entry into the holding: The magenta line is steering me to the holding fix (OSN) and AFTER passing the fix a turn anticipation occurs to intercept the outbound leg for the parallel entry, thus as the fix is handled as a must fly waypoint, what is not true. This behavior shoots me complete into the non-holding side which is NOT safe in my opinion. Further when exiting the holding the unit puts my to first overfly the fix BEFORE intercepting thereafter the outbound leg for the approach. This results in overshooting the outbound leg. I have added screenshots: RNP 25 approach chart showing the OSN holding IFD440 screenshots from the 10.3 simulator (same behavior in my plane with 10.2 software) showing the scenario Garmin 750 simulator screenshots showing same scenario, where intercepting is fly by and smooth (and safe) What is correct? A: IFD440 is correct, because holding fix MUST be handled as a must fly waypoint. B: Garmin 750 is correct, holding fix is handled as a fly by waypoint. C: Both A&B are correct. Any comments on that?

dmtidler Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 12 Feb 2016 Location: USA Status: Offline Points: 616	Post Options Post Reply Quote dmtidler Report Post Thanks(1) Quote Reply Posted: 20 Dec 2021 at 1:13pm
	My answer is C BTW – standard parallel hold entries are described in the AIM to be flown outbound on the nonholding side: (a) Parallel Procedure. When approaching the holding fix from anywhere in sector (a), the parallel entry procedure would be to turn to a heading to parallel the holding course outbound on the nonholding side for one minute, turn in the direction of the holding pattern through more than 180 degrees, and return to the holding fix or intercept the holding course inbound. Either GPS method appears to keep the aircraft within the protected holding airspace as long as the entry is performed at or below the applicable max holding airspeed.

nrproces Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 19 Sep 2016 Location: Marion, MT Status: Offline Points: 142	Post Options Post Reply Quote nrproces Report Post Thanks(0) Quote Reply Posted: 21 Dec 2021 at 8:42am
	Think this way, turn in the shortest direction to parallel the "outbound course" outbound. Yes, that may put you on the "non" holding side for that first turn... Here is an easy way to think about holding.. If you are within 70 degrees of the holding course at the holding fix, turn in the direction of "holding", if not, turn the shortest direction to parallel the out bound course outbound... 51-37?
	Sauce

guenter_ms Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 02 Nov 2012 Status: Offline Points: 27	Post Options Post Reply Quote guenter_ms Report Post Thanks(0) Quote Reply Posted: 27 Dec 2021 at 6:22am
	I agree, C is the right answer. Nevertheless Garmin makes it much more elegant and smoother especially when flying with GPSS and autopilot. Thank you