FAQ n.19502

ADR.3 What is the “Certification Basis” of an aerodrome?


The term “Certification Basis” (CB) is a key term in the area of oversight of aerodromes. According to Art. 34.1 (a) of the Basic Regulation (EU) No 2018/1139 a certificate is required for aerodromes in scope of the BR. The process of obtaining such an aerodrome certificate involves the establishment of the aerodrome’s CB to describe the infrastructure and equipment in terms of the regulatory requirements which they are meant to comply with. The concept of the CB gives also the necessary flexibility to take account of the non-uniform elements of the infrastructure at Europe’s airports. The CB concept does so by allowing local solutions to local issues of deviations from the European aerodrome certification specifications (CS). This CB document is proposed by the applicant (usually the aerodrome operator) and is finally decided on by the Competent Authority, the State entity designated to certify and oversee aerodromes. 

The CB concept is enshrined in the Basic Regulation under Art. 34.5, where it is stipulated that the certification basis for an aerodrome shall consist of the following:

  • a) the applicable certification specifications related to the type of aerodromes; 
  • b) those provisions of the applicable certification specifications for which an equivalent level of safety has been accepted; 
  • c) the special detailed technical specifications necessary when the design features of a particular aerodrome or the experience in operation render any of the certification specifications referred to in point (a) of this paragraph inadequate or inappropriate to ensure conformity with the essential requirements referred to in Article 33. 

The CB can be a list of all the applicable Certification Specifications, which are relevant to the aerodrome infrastructure elements in question, ideally with an indication for each infrastructure element how each relevant and applicable CS is satisfied. For CS that are not met, an equivalent level of safety (ELOS) or special condition (SC) can be proposed. The CB would normally reference the documentation showing the compliance, the ELOS or the SC, as the case may be.

When the applicant has demonstrated that the aerodrome complies with the agreed CB as per ADR.OR.B.025 (in Annex II of Regulation (EU) No 139/ 2014), one condition for the issuance of the certificate would be met. The final aerodrome certificate shall be considered to include the aerodrome’s CB, and moreover any Deviation Acceptance and Action Documents (DAAD) based on Art.7 “Deviations from certification specifications” of Regulation (EU) No 139/2014, which may have been issued. (See also ADR.AR.C.035 (d) in Annex II of 139/2014).

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