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. 8a, para. 2a and 2b of Regulation (EC) No 216/2019, as amended by 1108/2009, a certificate shall be required in respect of each aerodrome to which the European rules apply. The process of obtaining an aerodrome certificate involves the establishment of the aerodrome’s CB. The concept of the CB embodies the flexibility with which Europe takes account of the non-uniform infrastructure of its airport industry. The CB therefore allows for dealing with local issues by allowing local solutions to deviations from the CS. This CB 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 as per Art. 3.1 of Regulation (EC) No 139/2014. 

The CB consists of the following:

  • the applicable Certification Specifications (CSs) related to the type of aerodrome and the operations taking place there;
  • any provisions for which an Equivalent Level of Safety (ELOS) to that underlying the relevant Certification Specification has been proposed by the aerodrome and accepted by the competent authority;
  • any Special Conditions (SCs) determined and notified by the competent authority.

The CB can be a list of all the applicable Certification Specifications which are relevant to the aerodrome in question with an indication for each element how each CS is being met or if an ELOS is being argued for or if a special condition is being proposed. The CB would normally reference the documentation showing the compliance, the ELOS or the Special Conditions, as the case may be.

When the applicant has demonstrated that the aerodrome complies with the agreed certification basis as per ADR.OR.B.025 (in annex II of Regulation (EC) No 139/ 2014) one condition for the issuance of the certificate would be met. The certificate shall be considered to include the aerodrome’s CB, and 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 and answer to question ADR.5).

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