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Higher/Lower altitudes don't work like expected...

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drumsart
Post subject: Re: Higher/Lower altitudes don't work like expected...
Posted: Thu Feb 18, 2016 5:23 pm
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Thank you everybody for your answers.

Some remarks to help clear things :

"Richard you were at an altitude of 10574 when you requested an altitude change so that could be a factor as the altitude was rounded up. 11-2=9 more or less :lol:"

-The altimeter was in standard/1013mb but it would seem that PF3 not did not take into account. For reminder the zone where I fly (France) the transition height is of 4000ft (PF3 parameters).

-I have redo the same flight (logs attached) without putting the altimeter in 1013, this time the command "Lx" worked as hoped :) "L2"=-2000ft.

-But during the vectors approach, the control of approach left me in 8000ft or FL80. He has never asked me to descend.

-To finish, did the same flight again without asked to descend/cruise at FL80 and all worked like expected (descent, cap, speed and so on). This last flight is not in the Zip logs file.

Thanks and Regards,

Richard Portier

Attachments
Logs.zip
(267.08 KiB) Downloaded 170 times


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vololiberista
Post subject: Re: Higher/Lower altitudes don't work like expected...
Posted: Thu Feb 18, 2016 5:52 pm
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Joined: Wed May 27, 2009 8:41 pm
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drumsart wrote:
Thank you everybody for your answers.

Some remarks to help clear things :

"Richard you were at an altitude of 10574 when you requested an altitude change so that could be a factor as the altitude was rounded up. 11-2=9 more or less :lol:"

-The altimeter was in standard/1013mb but it would seem that PF3 not did not take into account. For reminder the zone where I fly (France) the transition height is of 4000ft (PF3 parameters).

Richard Portier
Hi,
The fact that your altimeter setting was 1013 isn't the point I don't think. It would appear your altimeter reading was actually 10,574 feet. 574feet is more than 19 millibars. 1013-19=994. all the sims FS9,FSX P3D calcualte millibars at 29.54545 ft per millibar. If you had been 100 feet lower you would have got what you wanted probably. You need to replicate the flight and stabilise it at exactly 10,000ft on 1013 and then ask for an altitude change, what happens then?

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drumsart
Post subject: Re: Higher/Lower altitudes don't work like expected...
Posted: Thu Feb 18, 2016 9:27 pm
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Posts: 154
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vololiberista wrote:
drumsart wrote:
Thank you everybody for your answers.

Some remarks to help clear things :

"Richard you were at an altitude of 10574 when you requested an altitude change so that could be a factor as the altitude was rounded up. 11-2=9 more or less :lol:"

-The altimeter was in standard/1013mb but it would seem that PF3 not did not take into account. For reminder the zone where I fly (France) the transition height is of 4000ft (PF3 parameters).

Richard Portier
Hi,
The fact that your altimeter setting was 1013 isn't the point I don't think. It would appear your altimeter reading was actually 10,574 feet. 574feet is more than 19 millibars. 1013-19=994. all the sims FS9,FSX P3D calcualte millibars at 29.54545 ft per millibar. If you had been 100 feet lower you would have got what you wanted probably. You need to replicate the flight and stabilise it at exactly 10,000ft on 1013 and then ask for an altitude change, what happens then?
Hi,

Where you pull that number (10,574ft) because I am very surprised, my altimeter indicated 10000ft with (10.13/29.92). I made two times the same flight with the same result.
I will be very surprised to have fly 2 times with 10,574ft indicated on the altimeter.
May be I'm wrong but is it possible to consider that PF3 has interpreted my altitude with the local pressure (+-1032) and not relative to standard altitude ? Btw which altitude you read in my last logs (cruise at altitude 10000ft local not FL100 Std) ?
Anyway, I will repeat the flight for a third time and report...

Thanks and Regards,

Richard Portier


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vololiberista
Post subject: Re: Higher/Lower altitudes don't work like expected...
Posted: Thu Feb 18, 2016 9:53 pm
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Posts: 980
Joined: Wed May 27, 2009 8:41 pm
Location: LIMZ
 
drumsart wrote:
vololiberista wrote:
Hi,

Where you pull that number (10,574ft) because I am very surprised, my altimeter indicated 10000ft with (10.13/29.92). I made two times the same flight with the same result.
Anyway, I will repeat the flight for a third time and report...

Thanks and Regards,

Richard Portier
It was in your log and as far as I can tell was your actual altimeter reading. Presumably you did set the transition altitude for your flight zone correctly. And for your take-off and destination.

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ThomasAH
Post subject: Re: Higher/Lower altitudes don't work like expected...
Posted: Thu Feb 18, 2016 11:33 pm
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drumsart, I tried it myself by setting high pressure, and you are right: PF3 has a bug here!

EHAM->EDDG, QNH1041, I reached FL110 with altimeter reset to 1013/29.92:
[ attachment ]
QNH1041-FL110.png (450.58 KiB) Viewed 2578 times
Now I requested +1000ft:
[ attachment ]
QNH1041-FL110+1000ft.png (755.39 KiB) Viewed 2578 times

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drumsart
Post subject: Re: Higher/Lower altitudes don't work like expected...
Posted: Fri Feb 19, 2016 3:04 am
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Hi Thomas,

It was what I suspected. We know that Fsx has the transition altitude to 18000ft everywhere. I noticed that PF3 in the dialogues between control/pilot correctly integrates different altitudes transitions (FL50 or Altitude 5000 and so...), however it seems that it does not take into account at this time the corrections in the calculations.

It would be interesting to see what values you will find if you fly over 18000ft (FL230 for example) with 10.13/29.92 at the altimeter. I'm almost sure of the result.

Thanks and Regards,

Richard Portier


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ThomasAH
Post subject: Re: Higher/Lower altitudes don't work like expected...
Posted: Sat Feb 20, 2016 8:06 pm
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ThomasAH wrote:
Maybe the solution for viewtopic.php?f=8&t=1835#p9679 will solve this one, too.
When loading your flight plan, PF3 3.0.1 claims LFRS to be at 5000ft, not the 90ft it should have.
So I guess waiting for 3.0.2 (and a corresponding updated demo) would be the best.
This works now in 3.0.2 (full version and fresh install of the demo)

And I haven't tried the higher/lower yet, but it should be fixed, too.

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drumsart
Post subject: Re: Higher/Lower altitudes don't work like expected...
Posted: Sun Feb 21, 2016 2:33 am
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Posts: 154
Joined: Fri Feb 12, 2016 7:07 pm
 
ThomasAH wrote:
ThomasAH wrote:
Maybe the solution for viewtopic.php?f=8&t=1835#p9679 will solve this one, too.
When loading your flight plan, PF3 3.0.1 claims LFRS to be at 5000ft, not the 90ft it should have.
So I guess waiting for 3.0.2 (and a corresponding updated demo) would be the best.
This works now in 3.0.2 (full version and fresh install of the demo)

And I haven't tried the higher/lower yet, but it should be fixed, too.
Hi thomas,

Great support ! Redid the flight LFBD>>>LFRS. Worked and seems there are no more higher/lower problem.

Had just two little glitches
-After take off I was at Alt +-2000 and Atc said "Descend to Alt 3000" with Atc Errors option=0 !
-After landing ground gave me a gate instead a GA ramp like asked in the options.

Btw the new version has no Pilot's/Taxi voice, I opened a new topic about it.

Thanks and Regards,

Richard Portier

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Richard Portier
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