FLC vertical mode.

[Alistair_Heaton]

Stick monkey here trying to work out what's going on when you select FLC on a A220/c series.

Can't find any documentation about what it's actually aiming for with a speed reduction decent.

It seems to command a green dot minimum drag angle of attack. It's doesn't slow down or go down. And chucking the gear out is asking for for a VS of 4k feet per min while it sorts itself out. Which is different to other OEM setups apparently.

Basically it's optimised for drift down

Anyone know about what it's doing?

My back ground is turboprops and A220 I have 2k hours on now as first jet type but it seems to be a hybrid of TP and Jet from what others have said.

 

[Alistair_Heaton]

There isn't one specified by the OEM.

There are 4-5 different ways to do it. All of them valid and safe.

I use all of them regularly. Which ever one is most effective for my plan gets used. My plans also include not annoying air traffic control.

 

[LittleInch]

Fair enough.

Is there though any established procedure for feedback to the OEM or yur internal ops mgt about that fact that their shiny new plane doesn't work in the same manner as all the others and therefore external people like ATC are asking / expecting a level of performance that is not as easy as it used to be?

 

[Alistair_Heaton]

Well it does what it says in the manuals. Very well to be honest.

I just find life easier and safer when I understand the engineering of what a machine is doing.

And it seems I am not alone in the pilot world. You explain to colleagues in factual principles.

Eg "flc decelerating will pitch for green dot angle of attack, so you will get cock all drag so you won't slow down or go down which will mess with your decent gradient and ATC might spin you out of sequence. VS keep the gradient and use Vsqr to give drag and dump energy. Just tell ATC you will go down then slow down."

But I don't say things like that unless I am sure its factually correct.