The original question is (as I understand it) .. "Is it safe to increase takeoff thrust to TOGA from Flex?".
Given the lack of other information, I'll make some assumptions.
- We are talking Airbus.
- Flex for one Airbus type is the same as Flex for another.
The Flex thrust rating on Airbus is effectively an assumed temperature reduced thrust from TOGA - ie Flex with no assumed temperature is the same as TOGA. Given this, the min control speeds that are used in the Flex calculation are the TOGA speeds.
- So, is it safe? Yes. You will have reduced field length requirements, will reach your V speeds faster and have improved climb gradients.
- Would you get a better result recalculating? Yes. You will get V speeds more appropriate to your situation.
So we have two considerations ... Is it Safe ... Is there a better way ...
For what it is worth.
N