Just to try and clarify my original question,
Hoping someone can clarify some info for me that I cannot seem to get my head around.
On a SID
unless otherwise stated (which would be higher) we assume the PDG is 3.3% (2.5% + 0.8%). As per Pans Ops which states that the procedures are based on all engines operating and that in the event of failure etc. an operator needs to come up with contingency procedures. Normally a SID
will give you 35ft clearance minimum.
EU OPS 1.495 states that an operator needs to clear all obstacles in the net take off flight patch by 35ft. My understanding is that this relates to the obstacles accountability area which may or may not include the SID
but equates to an area presribed by EU/FAA ops.
Performance wise, in this case I am referring to the 737, there are certain criteria relating to requirements for 1st/2nd/3rd and 4ft segment climbs in the event of an engine failure/loss. This depicts a minimum climb CAPABILITY for the various stages which need to provide a minimum of 35ft above all terrain in the path. In these climb requirements there is mention of a positive of the 1st, 2.4% of the 2nd and 1.2% for the 3rd and 4th. Is this just climb capability or does the aircraft need to actually perform this? For example on the 3rd segment it says a minimum capability of 1.2% which at 164 Knots would equate to 200ft/min, would we need to actually do this in the accel phase or is it ok that the aircraft Is just capable? ie at my company we just accel and do not climb.
What confuses me and what I hope someone can help me with is this. On a SID
with a PDG of 3.3%. an aircraft with two engines needs to clear all obstacles by a minimum of 35ft.
EU Ops states that an operator needs to able to clear all obstacles in the net take off flight path by 35ft. I presume this is with one engine and would be any obstacle in the Identification area.
How different is the SID
going to be in relation to any other path the aircraft can take in that area. The SID
is minimum 3.3% and gives you 35ft clearance. For engine out the climb performance, the aircraft gives need to be a minimum of 2.4% BUT is still required to give you 35ft clearance over any obstacle in the ID
How do two different requirements with different protocol give you the same thing?. How would the path of a SID
which needs 3.3% be all that different from the path followed with an engine out with a max of 2.4% gradient but still give you 35ft clearance, the same as the SID
I am confused
Any info would be greatly appreciated