Quote:
Originally Posted by bluedevils
Without seeing the routes Dispatch files ... for arguments sake I'll assume they DON'T file J15 between ABQ & CME -- but use CME as the initial fix on departure / last fix on arrival. In this case, ABQ J15 CME wouldn't be a 'route segment' & I guess radar vectors on departure / arrival would be planned for. In either case, you'd be on this 'route segment' - if flown - well below the valid altitude for using DD / TC anyway (i.e. in initial climb or in descent). Perhaps TOC or TOD points even have something to do with it. In any case - great question ....
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another way of saying the same thing is to say that TC/DD data is required for routes where 8k terrain is found AT CRUISE. meaning between TOC and TOD. or at least above the valid altitude. if you lose an engine after TOD, you'd be able to descend/drift down to the destination.
I'm not positive this is the case for this specific example, because what if you lose an engine on the way to ABQ before TOD and without any DD alternates or escape routes published you elect to continue, and now the terrain may be in your way and your ceiling below it... not likely since you're probably at or below MGLW at this point.
send a message to GS... maybe this route does require TC/DD.
the point about the airway being 5 miles wide on either side is not valid in my opinion. airway width causes things to be MORE restrictive, not less. it means that terrain has to be less than 8k anywhere in the 10 mile width, rather than saying that as long as any part of the width is below 8k it's ok...