Originally Posted by
kenparry
Also interesting is how long developments continued - e.g. aterpster's reference above to lateral clearance of obstacles. Is change still going on to these regs?
In the U.S. the FAA encourages Part 121 operators to use AC 90-121. Last I heard all of them were.
If you are a 135 operator without a performance dept., and instead use APG, it will be a takeoff flight path predicated on AC 90-121. I suppose Jepp's data department does the same.