Take-off Minima( RVR/Visibility)
hi
I`m struggling right now with the Appendix JAR-OPS 1.430, relating the take-off minima:
There is the quote:
" For multi-engined aeroplanes in the event of a critical power unit failure, there may be a need to re-land immediately and to see and avoid obstacles in the take-off aera. Such aeroplanes may be operated to the following take-off minima provided they are able to comply with the applicable obstacle clearance criteria, assuming engine failure at the height specified. The take-off minima established by an operator must be based upon the height from which the one engine inoperativee net take-off flight path can be constructed. "
The table is divided in two parts:
1.Assumed engine failure height above the take-off runway
2.RVR/Visibility
How can you know your assumed engine failure height, before departure, that doesn`t make any sense to me?
And what is the net take-off flight path?
Maybe anybody can help me,
thanks
subsidence