Hello,

 

I have seen lately that the Top of Decent point in the PMDG 737 is a bit late. Causing me to get "Destination path unachievable" a lot from the FMC.and going over 250kts. under 10,000ft.

 

I usually use a cost index of 25-35. And reserve of 5.0. And my normal cruiz alt. is above FL300.

 

Anyone have any ideas?

 

Thanks.

Descent winds forecast haven't been entered, and the aircraft is assuming a 0kt tailwind.
you have more than 0 knots tail wind and no headwind.

Ohh, okay. Thank you.

What page in the FMC would that info go into?

 

 

Anyone have any ideas?

 

Yep.  Usually this has to do with not giving the plane the information is wants/needs.

 

First, I'd recommend watching this:

 

...and then watch this one to understand how to give it the information it wants:

What page in the FMC would that info go into?

 

 

See page 11.43.12 of FCOMv2.