jientho wrote:
Quote:
Now, you seem to agree that there is NO condition where it makes any sense, so WHY IS IT ALLOWED BY THE SYSTEM to be entered if there is risk (even the tiniest bit)? That is my point.
Because it makes no sense to disallow FL0000. If is did, you have to disallow FL10 for runways 1000 ft ASL
No. You misunderstand. The requirement is to disallow entries that make zero sense
in the real world. Take the lowest altitude of any possible airport
in the real world, add say 500', and disallow any target flight levels below that. Probably eliminates FL000, FL001, FL002, FL003, and FL004 only. Yes it may only eliminate the "trap" for approach to near-sea-level airports. But that ain't peanuts. Or Boeing (or FAA) may determine that adding 1000' or even 2000' may be more in line with the only valid purpose of FLCH, which would bring in even more airports.
Editing to add: also see
http://www.pprune.org/rumours-news/5...ml#post7937752 for an even better solution.