The site design may include:

• Finalising the selection of the installation location for the GBAS. This should include addressing any unique product requirements pertaining to the siting of the GBAS. As an example, some manufacturers may impose restrictions on the proximity of the antennas to a runway or distance to the furthest Decision Height Point.
• developing the Civil Works design and obtaining approvals that the drawings comply with local legislative requirements.
• How the GBAS will integrate with other existing CNS and ATM systems.

This will primarily involve performing the Civil Works in accordance with the approved design drawings, installation of communications and power infrastructure, and installation of the GBAS equipment in accordance with the manufacturer's manuals.

This activity involves the integration of the GBAS ground installation with other CNS and ATM systems, including the maintenance activities that could be shared between systems.

• Factory Acceptance Testing: Prior to the installation of the GBAS, States may elect to perform a Factory Acceptance Test to verify that the product conforms with the State’s specification.
• Site Acceptance Testing: Post installation, Site Acceptance Testing will nominally involve verifying the system once deployed is performing as per the requirements, has been installed in accordance with the approved documentation and manufacturers manuals.
• Flight Testing/Inspection: Prior to Commissioning, a Flight Inspection should be completed. Also, as a result of a procedure introduction or modification, or whenever site changes may impact GNSS signal reception and VHF data broadcast transmission.

Prior to Commissioning the GBAS for full operational use, States may elect to perform an Operational Test & Evaluation program. The Operational Test & Evaluation program may involve independent monitoring of the GBAS signal in space and/or approved aircraft operators using GBAS Landing System (GLS) IFPs in controlled conditions to validate the service is operating as intended.