putting an ADF in does not make it "airways equipped"!!!
For an airways fit you will require an ADF a DME and FM Immune radios as well as a Mode S transponder. VOR/Loc etc. ADF is required for airways flying a lot of intersections are still NDB beacons WCO for example.
Not to mention the usual stuff like 2 alts. GPS can be used as primary nav in the airways now I use a GNS430 for the purpose ut you are still required to carry all of the other equipment.