4-4-4. ALTERNATIVE ROUTES
When any part of an airway or route is unusable because of NAVAID status, clear aircraft that are not RNAV capable via one of the following alternative routes:
- A route depicted on current U.S. Government charts/publications. Use the word “substitute” immediately preceding the alternative route in issuing the clearance.
- A route defined by specifying NAVAID radials, courses, or azimuths.
- A route defined as direct to or between NAVAIDs.
NOTE: Inform area navigation aircraft that will proceed to the NAVAID location of the NAVAID outage.