Once a preliminary site has been identified, there are a number of different GBAS solutions available in the market to support the delivery of a GBAS Landing System service. Careful consideration and selection of the most appropriate solution is essential to ensure that the expected benefits are realised. The following provides high level guidance when selecting a GBAS product:

• States should ensure that the product conforms with GBAS requirements in ICAO Annex 10, Volume 1 Standards and Recommended Practices and, where applicable, in ED-114B, and that any non‐conformances have been appropriately assessed and accepted.
• States should consider whether the proposed solution has previously been certified by another State. Previous certification may allow States to leverage the existing certification evidence to expedite the regulatory approvals process and simplify any developmental processes.
• Nominally certification involves demonstration that the product meets a particular specification published by a State. If States intend on utilising an existing product that has previously been certified by another State, then States should assess:
  • If the specification used to develop the certified GBAS product is suitable for use in the local region, whose conditions are identified in the Technical Feasibility Assessment phase. This should involve a comprehensive analysis of each of the requirements contained within specification to determine the applicability, and if determined to be either partially applicable or not applicable, alternative requirements should be developed.
  • Any waivers and deviations to the specification used to develop the certified GBAS product and whether those waivers and deviations are acceptable for the local region.
• States should consider the development path for the product and whether the development path aligns with the intended operational objectives.
• States should consider developing a set of site specific requirements that are unique to the particular location at which the solution is intended to be deployed. Site specific requirements may include:
  • Operational Requirements
  • Legislative requirements
  • Work Health and Safety requirements
  • Civil works specific requirements
  • Monitoring and integration requirements
  • Installation specific requirements
  • Maintenance requirements
• The responsible for the design, installation, operation and maintenance of the facility should be considered when selecting a GBAS solution.
• States should establish appropriate assessment criteria against which all GBAS products will be assessed.