1. AIR OPERATIONS AREA (AOA). Any area of the airport used or intended to be used for the landing, takeoff, or surface maneuvering of aircraft. An air operations area includes such paved or unpaved areas that are used or intended to be used for the unobstructed movement of aircraft in addition to its associated runways, taxiways, or aprons.  
  2. CONSTRUCTION. The presence and movement of construction-related personnel, equipment, and materials in any location that could infringe upon the movement of aircraft.
  3. CERTIFICATED AIRPORT. An airport that has been issued an Airport Operating Certificate by the CARC under the authority of JCAR part 139, Certification and Operation of Land Airports.
  4. CARC FORM NOTICE OF PROPOSED CONSTRUCTION OR ALTERATION. The form submitted to the CARC/ CEO  as formal written notification of any kind of construction or alteration of objects that affect navigable airspace, as defined in JCAR part 77, Objects Affecting Navigable Airspace (see DOASS Publication 77-2,Proposed Construction or Alteration of Objects that May Affect the Navigable Airspace).
  5. CARC FORM NOTICE OF LANDING AREA PROPOSAL. Form submitted to the CARC/ CEO  as formal written notification whenever a project without an airport layout plan on file with the CARC  involves the construction of a new airport; the construction, realigning, altering, activating, or abandoning of a runway, landing strip, or associated taxiway; or the deactivation or abandoning of an entire airport. 
  6. MOVEMENT AREA. The runways, taxiways, and other areas of an airport that are used for taxiing or hover taxiing, air taxiing, takeoff, and landing of aircraft, exclusive of loading ramps and aircraft parking areas (reference JCAR part 139).
  7. OBSTRUCTION. Any object/obstacle exceeding the obstruction standards specified by JCAR part 77, subpart C. 
  8. OBJECT-FREE AREA (OFA). An area on the ground centered on the runway, taxiway, or taxilane centerline provided to enhance safety of aircraft operations by having the area free of objects except for those objects that need to be located in the OFA for air navigation or aircraft ground maneuvering purposes (see CARC publication AN 14-Ifor additional guidance on OFA standards and wingtip clearance criteria).
  9. OBSTACLE-FREE ZONE (OFZ). The airspace below 150 feet (45m) above the established airport elevation and along the runway and extended runway centerline that is required to be clear of all objects, except for frangible visual NAVAIDs that need to be located in the OFZ because of their function, in order to provide clearance protection for aircraft landing or taking off from the runway and for missed approaches (refer to CARC Publication An 14-I for guidance on OFZs). 
  10. RUNWAY SAFETY AREA (RSA). A defined surface surrounding the runway prepared or suitable for reducing the risk of damage to airplanes in the event of an undershoot, overshoot, or excursion from the runway, in accordance with CARC Publication An 14-I.
  11. TAXIWAY SAFETY AREA. A defined surface alongside the taxiway prepared or suitable for reducing the risk of damage to an airplane unintentionally departing the taxiway, in accordance with CARC  publication AN 14-I.
  12. THRESHOLD. The beginning of that portion of the runway available for landing. In  some instances, the landing threshold may be displaced.
  13. DISPLACED THRESHOLD. The portion of pavement behind a displaced threshold that may be available for takeoffs in either direction or landing from the opposite direction. 
  14. VISUAL GLIDE SLOPE INDICATOR (VGSI). This device provides a visual glide slope indicator to landing pilots. These systems include precision approach path indicators (PAPIs), visual approach slope indicators (VASIs), and pulse light approach slope indicators (PLASIs).