Originally Posted by
gulliBell
I don't know how the boundary changes given the LOW ALT mode was engaged, I can't see anything on that other than "significantly reduces mode 4 boundaries".
With LOW ALT, all TERRAIN warnings are inhibited, you get only GEAR warnings below 60kts, and the upper height boundary is reduced from 150ft to 100ft (for mode 4A - it's already 100ft for 4B).