Originally Posted by AIMS by IBM
You leave with a minimum amount of fuel as per dispatch release regulations.
This contains a certain amount of contingency that in my opinion is not intended also to be used to cover the one engine out case.
Now once airborne I am not too sure if this still stands.
AIMS by IBM
First point, UK registered aircraft do not operate using the dispatch release system you have in the USA, although I have no doubt that pre-flight fuel planning considerations are very similar.
Second point, contingency fuel is just that - it is there to cover
any airborne contingency, i.e. not limited to certain events only. This event (engine shut-down) would have necessitated in-flight re-planning by the crew to ensure they had sufficient fuel for continuation with safe reserves (which they had and they did).
Third point, see point two - contingency fuel is there to be used if needed when airborne.