Today I tried to plan a flight from ND54 to KBIS and although I can't see any altitude restriction anywhere along the route that wouldn't allow an altitude of 4000 ft, P2ATC insists on requiring a minimum cruise altitude of 6000 ft. When I try to change the altitude down to 4000 ft it simply ignores it. And in flight, when I try to request a lower altitude from ATC, I get "Your requested altitude is below the minimum for your route.Climb and Maintain Four Thousand  Niner Hundred feet". Here's the route:

 

P2ATC itself does not list any relevant waypoint restrictions in the 'Alt Restr' column, and as far as I can tell the section from BEHQY to YIRNU (part of V55) has a restriction of 3900 - 17999 ft, and the DME arc a restriction of 3900 ft (as seen on the approach chart). So what is the reason P2ATC doesn't let me enter anything below 6000 ft?

 

Thanks!

Dirk

 

Edited November 28, 20205 yr by woodstock327

That is not a waypoint restriction.  It is Terrain avoidance.

You can change your Minimum Enroute AGL setting to a lower number if you want to skim the terrain, or you can turn off the "Calculate Safe EnRoute Altitude" option.

46 minutes ago, Dave-Pilot2ATC said:

It is Terrain avoidance.

Ah, my bad... I plan my routes with LittleNavMap and have 2000 ft Enroute AGL set there, but 3000 ft in P2ATC, so that makes perfectly sense now. Highest terrain along route is 2000 ft, and with 3000 ft Enroute AGL, plus bearing based altitude = 6000 ft minimum...

Thanks Dave!