Use of TOGA with Flex speeds
Interested to know your thoughts on the following:
Regarding take-off performance.
The scenario is, you are on stand and plan for a Flex take-off. Whilst taxying out, due to bad weather in the vicinity of the airfield, Captain suggests the use of TOGA instead. You do not however re-calculate the performance based on TOGA, instead you keep the speeds from the Flex calculation.
My question is, is this safe?
A couple of things which I would like to clarify:
a) with the use of TOGA, normally the performance calculation would give a reduced V1, so your decision point on the runway would be earlier. The Flex V1 would be higher/later.
b) in relation to point a) - say our Flex V1 was 140 kts. With TOGA, you would reach this speed at an earlier point on the runway, allowing a slightly longer remaining stopping distance, therefore is the use of TOGA with Flex speeds considered more conservative?
Thank you for any replies in advance.