Question 1

How do I find my airport's ADG and TDG classification?

Accepted Answer

Identify the critical (most demanding) aircraft using the runway, then look up its Airplane Design Group (ADG, by wingspan) and Taxiway Design Group (TDG, by main-gear width and cockpit-to-main-gear distance). AvPlot returns both from the aircraft type per FAA AC 150/5300-13B.

Question 2

What is the difference between ADG and TDG?

Accepted Answer

ADG (Airplane Design Group, I to VI) is based on wingspan and tail height and drives runway and taxiway widths and separations. TDG (Taxiway Design Group) is based on main gear width and cockpit-to-main-gear distance and drives taxiway fillet and pavement geometry.

Question 3

What determines Taxiway Design Group (TDG)?

Accepted Answer

TDG is set by two dimensions, the main gear width (MGW) and the cockpit-to-main-gear distance (CMG), per AC 150/5300-13B Table 1-4.