Optimal FL in the PMS, v1.0.3

[mark75]

Hi,

even after filling GW, Fuel and OAT in the flight init page of the PMS on the ground, I get OPT flight level as 888. This looks to me like a regression bug, not present in the previous versions.

 

Edited Thursday at 09:44 AM by mark75

[Prof_Plumpy]

Getting the same.  1.0.3 seems to have added back a bunch of old problems 1.0.2 fixed a pile of new ones. 

 

[richboy2307]

Hi

As of 1.0.3, the PMS behaviour was changed to show "888" when it cannot calculate any valid result. It is also actively using the current SAT value to determine OPT. As such, it will update in flight, particularly when current SAT updates to sensible values where a valid result can be achieved.

SAT of +40c at those weights won't net any valid results, hence the 888. Team is still investigating whether you can force a prediction on the ground, references we have are unclear but the behaviour currently is reflecting best the "known" reference logic.

[mark75]

21 minutes ago, richboy2307 said:

Hi

As of 1.0.3, the PMS behaviour was changed to show "888" when it cannot calculate any valid result. It is also actively using the current SAT value to determine OPT. As such, it will update in flight, particularly when current SAT updates to sensible values where a valid result can be achieved.

SAT of +40c at those weights won't net any valid results, hence the 888. Team is still investigating whether you can force a prediction on the ground, references we have are unclear but the behaviour currently is reflecting best the "known" reference logic.

Hi,

thank you for the reply. That was a real SAT, in New Delhi. Anyway, thanks for the explanation.

Edited 16 hours ago by mark75

[MD82]

Makes sense. A SAT of +40°C at FL360 would fly off of any chart 😉

[mark75]

Maybe. But anyway, that SAT on Cruise page is taken from Flight init page. I entered a correct value, according to the PMS guide.