Why do we have take-off segments?

[yonygg]

3 questions about Takeoff Segments

Hiya' all,

I hope this is the righ thread to post this:

I have 3 questions I came up with about the Takeoff Segments:

1. I was asked by a friend a legal document that summerises all 4 takeoff segments: where each starts and ends, speeds to be flown in each one, power settings in each one, required climb gradients, etc..
Where can I find such a thing?

And with this regards (maybe), I see a lot that CS 25 is being mentioned. What is CS 25?

2. As far as I know the $th segment (Final Takeoff Segment) ends either at 1,500' AAL (Above Aerodrome Level) or when CLEAR OF OBSTACLES.
(I assume which ever is higher).
How is CLEAR OF ABSTACLES defined for this purpose? Bt what obstacle clearance?

3. Are all 4 segments relevant both in Normal operations AND Single Engine Operations or just when loosing an engine at V1?
Are there any differences between the 2 situations?


Thanks a bunch!