When are you required to maintain a plotting chart?
I referred to the Federal Aviation Administrations's Advisory Circular 91.70a to discover we are required to maintain a plotting chart where the route segment between the operational service volume of International Civil Aviation Organization standard ground-based NAVAIDS exceeds 725 nautical miles for turbojet aircraft and 450 nautical miles for turboprop aircraft on page 28. On page 29 there is a statement that says "Plotting Procedures for Special Conditions. The Administrator requires plotting procedures for routes of shorter duration that transit airspace where special conditions exist such as reduced lateral and vertical separation standards, high density traffic, proximity, or potentially hostile border areas."
It does not suggest a place where I can find a listing of such routes. Can any of you suggest where I might find this list?
Thanks!