Cruise at CLB N1 barely maintains M.80

[sztrova]

As you can see at 37630lbs I should be fine at FL380 while it needs almost full CLB thrust to do so. I was maintaining .82 easily then slowly used more more power and I had to slow down to M.80. I even tried to turn wing AI ON (it was off before). Any ideas?

[Andydigital]

See the sticky post at the top of this forum, I think this will be why.

 

 

[sztrova]

Thank you Andy, but please note my TAT: it's pretty low so I should've been fine I think.

[Andydigital]

Looking at the graph in that thread -47C is showing about 89-90 N2 so you seem to be doing better than expected.

[sztrova]

You are looking my SAT while the table is TAT. My TAT is -18C and it's more around N2 94.5% according to the table 

[sztrova]

I went up to FL380 and it's colder but even for M.82 I need less thrust. I'm pretty sure it's simulating something realistically but I just can't figure out what. 

[Andydigital]

Yep need my eyes testing sorry.

 

[sztrova]

8 minutes ago, Andydigital said:

Yep need my eyes testing sorry.

 

No, not at all. Thank you for trying to help me Andy.

 

[Sportstar]

Switch that WING A/ICE off. You are in clear air without ice accretion, so you don't need it.

Should increase the thrust but might not be the only cause of your problem.

[sztrova]

You are right, but I turned it ON just to see if I got some icing on the wing. When it happened the wing A/ICE was OFF.