VMCG and VMCA with ATM or DERATE T.O 737NG

[M.82]

Hi guys,

Sory but I was reading my FCTM again and I cannot understad the relationship between the N1 value that you get from a Reduced Thrust (ATM or Fixed Derate) Take OFF, and the VMCG and VMCA.

How can VMCA and VMCG change with N1?

Thanks!

[STBYRUD]

More thrust to start with -> more asymmetric thrust during an engine failure that would have to be countered with the flight controls, reducing the takeoff thrust will lower minimum control speeds as well.

[mutt]

Go back and read the manual again, it should tell you that YOUR VMCG/VMCA doesn't change with reduce thrust using the ATM method.

Mutt

[STBYRUD]

Only because the performance calculations always assume fully rated thrust or fixed derate, true...

[M.82]

Yes, sure, VMCG and VMCA are modified if you take off with a Fixed derate.

Thanks STBYRUD, it's true, "more power = more asymmetri"

Thanks guys
Happy new year