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Irregular Descent Profile

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Sabretooth78
Post subject: Irregular Descent Profile
Posted: Fri Dec 08, 2023 11:45 pm
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Joined: Sun Dec 31, 2017 4:53 am
 
Installed the latest beta (3.21.50) and now getting this "can't descent below current TOD" error:

Possible I'm just being ignorant of other features, but I usually modify these manually as the computed descent always seems to be too late.

The flight plan presets never seem to change this behavior so I've just gotten used to changing them manually; it often needs to be done anyway to meet STAR constraints - this example of CAMRN4 into KJFK being a good example. Needless to say, being unable to push the TOD back is an issue.
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SkyCamel
Post subject: Re: Irregular Descent Profile
Posted: Sat Dec 09, 2023 7:38 am
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Location: Gent, Belgium
 
Sabretooth78 wrote: *  Fri Dec 08, 2023 11:45 pm
Possible I'm just being ignorant of other features, but I usually modify these manually as the computed descent always seems to be too late.
To my big frustration I always have the exact problem. I don't think I should be modifying the calculated flight plan every time I load it into PF3.
What I can't wrap my head around is that when loading the flightplan you indicate the climb rate but also the descent rate for the aircraft you're using.
Also the speed. I putt my descent rate extra low to 1000 fpm for my fbw a32nx to make sure I get an "early descent, yet I always get a late descent.
PF3 knows my position, the distance to the airport I will be landing, my descent rate and the speed so it must be possible to calculate the TOD?

I know, this thread is about Beta releases and that's exactly the reason why I respond on this here. I can't undo myself of the impression (mind you, I certainly can be wrong!) that in earlier versions I didn't have that problem, or certainly not that frequently.
Cheers,
Luc


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Dave March
Post subject: Re: Irregular Descent Profile
Posted: Sat Dec 09, 2023 9:03 am
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Posts: 6122
Joined: Mon May 18, 2009 6:22 pm
Location: Sawtry, Cambridgeshire. UK
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Sabretooth78 wrote: *  Fri Dec 08, 2023 11:45 pm
Installed the latest beta (3.21.50) and now getting this "can't descent below current TOD" error:

Possible I'm just being ignorant of other features, but I usually modify these manually as the computed descent always seems to be too late.

The flight plan presets never seem to change this behavior so I've just gotten used to changing them manually; it often needs to be done anyway to meet STAR constraints - this example of CAMRN4 into KJFK being a good example. Needless to say, being unable to push the TOD back is an issue.

Screenshot 2023-12-08 183745.png
Oh dear, looks like I might have broken something (again!), I'll take a look.

_________________

Cheers

Dave March

Email: dmarch@oncourse-software.co.uk

I don't know if my memory is getting worse as I get older...
...I just can't remember how it used to be!

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Dave March
Post subject: Re: Irregular Descent Profile
Posted: Sat Dec 09, 2023 9:04 am
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Location: Sawtry, Cambridgeshire. UK
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SkyCamel wrote: *  Sat Dec 09, 2023 7:38 am
Sabretooth78 wrote: *  Fri Dec 08, 2023 11:45 pm
Possible I'm just being ignorant of other features, but I usually modify these manually as the computed descent always seems to be too late.
To my big frustration I always have the exact problem. I don't think I should be modifying the calculated flight plan every time I load it into PF3.
What I can't wrap my head around is that when loading the flightplan you indicate the climb rate but also the descent rate for the aircraft you're using.
Also the speed. I putt my descent rate extra low to 1000 fpm for my fbw a32nx to make sure I get an "early descent, yet I always get a late descent.
PF3 knows my position, the distance to the airport I will be landing, my descent rate and the speed so it must be possible to calculate the TOD?

I know, this thread is about Beta releases and that's exactly the reason why I respond on this here. I can't undo myself of the impression (mind you, I certainly can be wrong!) that in earlier versions I didn't have that problem, or certainly not that frequently.
Cheers,
Luc
I'll revisit the TOD calculations

_________________

Cheers

Dave March

Email: dmarch@oncourse-software.co.uk

I don't know if my memory is getting worse as I get older...
...I just can't remember how it used to be!

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Dave March
Post subject: Re: Irregular Descent Profile
Posted: Sat Dec 09, 2023 9:39 am
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Posts: 6122
Joined: Mon May 18, 2009 6:22 pm
Location: Sawtry, Cambridgeshire. UK
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SkyCamel wrote: *  Sat Dec 09, 2023 7:38 am
Sabretooth78 wrote: *  Fri Dec 08, 2023 11:45 pm
Possible I'm just being ignorant of other features, but I usually modify these manually as the computed descent always seems to be too late.
To my big frustration I always have the exact problem. I don't think I should be modifying the calculated flight plan every time I load it into PF3.
What I can't wrap my head around is that when loading the flightplan you indicate the climb rate but also the descent rate for the aircraft you're using.
Also the speed. I putt my descent rate extra low to 1000 fpm for my fbw a32nx to make sure I get an "early descent, yet I always get a late descent.
PF3 knows my position, the distance to the airport I will be landing, my descent rate and the speed so it must be possible to calculate the TOD?

I know, this thread is about Beta releases and that's exactly the reason why I respond on this here. I can't undo myself of the impression (mind you, I certainly can be wrong!) that in earlier versions I didn't have that problem, or certainly not that frequently.
Cheers,
Luc
Just wanted to add... the climb and descent rate in your profile has no bearing on the altitudes set in the flight plan, as I have no way of know which profile (if any) you may select. The rate of climb/descend is used if using VCP to adjust your AP, so when instruction to climb/descend the VCP knows what to dial in on the VS.

_________________

Cheers

Dave March

Email: dmarch@oncourse-software.co.uk

I don't know if my memory is getting worse as I get older...
...I just can't remember how it used to be!

[ img ]


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Dave March
Post subject: Re: Irregular Descent Profile
Posted: Sat Dec 09, 2023 6:58 pm
Site Admin
Offline
 
Posts: 6122
Joined: Mon May 18, 2009 6:22 pm
Location: Sawtry, Cambridgeshire. UK
Contact: Website
 
Sabretooth78 wrote: *  Fri Dec 08, 2023 11:45 pm
Installed the latest beta (3.21.50) and now getting this "can't descent below current TOD" error:

Possible I'm just being ignorant of other features, but I usually modify these manually as the computed descent always seems to be too late.

The flight plan presets never seem to change this behavior so I've just gotten used to changing them manually; it often needs to be done anyway to meet STAR constraints - this example of CAMRN4 into KJFK being a good example. Needless to say, being unable to push the TOD back is an issue.

Screenshot 2023-12-08 183745.png
The latest beta (3.21.51) should fix this problem

_________________

Cheers

Dave March

Email: dmarch@oncourse-software.co.uk

I don't know if my memory is getting worse as I get older...
...I just can't remember how it used to be!

[ img ]


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Profile Quote
Dave March
Post subject: Re: Irregular Descent Profile
Posted: Sat Dec 09, 2023 6:59 pm
Site Admin
Offline
 
Posts: 6122
Joined: Mon May 18, 2009 6:22 pm
Location: Sawtry, Cambridgeshire. UK
Contact: Website
 
SkyCamel wrote: *  Sat Dec 09, 2023 7:38 am
Sabretooth78 wrote: *  Fri Dec 08, 2023 11:45 pm
Possible I'm just being ignorant of other features, but I usually modify these manually as the computed descent always seems to be too late.
To my big frustration I always have the exact problem. I don't think I should be modifying the calculated flight plan every time I load it into PF3.
What I can't wrap my head around is that when loading the flightplan you indicate the climb rate but also the descent rate for the aircraft you're using.
Also the speed. I putt my descent rate extra low to 1000 fpm for my fbw a32nx to make sure I get an "early descent, yet I always get a late descent.
PF3 knows my position, the distance to the airport I will be landing, my descent rate and the speed so it must be possible to calculate the TOD?

I know, this thread is about Beta releases and that's exactly the reason why I respond on this here. I can't undo myself of the impression (mind you, I certainly can be wrong!) that in earlier versions I didn't have that problem, or certainly not that frequently.
Cheers,
Luc
Please check the latest beta (3.21.51) for the new 'descent profile' option

_________________

Cheers

Dave March

Email: dmarch@oncourse-software.co.uk

I don't know if my memory is getting worse as I get older...
...I just can't remember how it used to be!

[ img ]


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Sabretooth78
Post subject: Re: Irregular Descent Profile
Posted: Mon Dec 11, 2023 4:34 am
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Posts: 40
Joined: Sun Dec 31, 2017 4:53 am
 
3.21.51 seemed to work correctly again with my latest flight today. (Didn't catch the note about the descent profile though.) I'll post back if I have any problems in the future. Thanks!


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