ISA level

[Driver170 42]

Well to start i don't know what ISA is been reading but can't figure it out! I do the calculations per tutorial 2 into the FMC and thats that done but my question is he works out ISA from FL180 is this the standard alt for it ie TL or can i do the calculation based on my dest airport TL?

[Spin737 102]

It's better data for the descent if you use the ISA DEV at FL180. But don't worry about it. It's not critical. I've never had a VNAV DISCONNECT or missed an altitude restriction because I didn't have the ISA DEV box filled. Don't stop simming because that field is empty.

[scandinavian13 5,192]

Well to start i don't know what ISA is been reading but can't figure it out! I do the calculations per tutorial 2 into the FMC and thats that done but my question is he works out ISA from FL180 is this the standard alt for it ie TL or can i do the calculation based on my dest airport TL?

 

[Driver170 42]

To both of you thankyou very much

 

Ohh one other thing guys do you know where i can get sums on how to calculate ie rate of descent? Just anything really i'm looking to print these things out and have them to hand when flying? Like what you find in tutorial 2

 

Thanks alot

[scandinavian13 5,192]

 

 

Ohh one other thing guys do you know where i can get sums on how to calculate ie rate of descent?

 

Not sure what you're asking.  What are you trying to do?

[Driver170 42]

Like the calculations you get in tutorial 2 just looking for more