Last Sector Power, You want to hope that they DO fly straight ahead if there is no published escape procedure.
When calculating takeoff weight charts, it is necessary to assess all the obstacles within the takeoff flight path.
As there may be many SIDS, all turning in different directions, it is normal practice to look at the straight ahead flight path, and if that becomes uneconomic because of terrain, then design a turn.
Turns are a pain because you need to assess radaii of turn at different speed/flap configurations, where straight ahead procedures are not speed dependent.
So - in the event of a failure on the runway, follow the escape procedure or if there isn't one, go straight ahead!
PS for all aeroplanes the analysis needs to be done up to the LSA/MSA not 1500 ft,
12nm is nowhere near enough to get to 1500 ft if the aircraft is performing at NETT. ie 1.6% for a twin.
A twin performing at nett (which is all you are guaranteed!) will climb at 97 ft per nm. A 4 engine aircraft climbing at nett will climb 121 ft per nm.
So for a twin to reach 1500 ft (assuming that the terrain underneath is not rising) it will consume 15.5 track miles.
I look out to 30 nm when I run an analysis, using type A's, topos etc
[ 22 July 2001: Message edited by: Capn Laptop ]