In Spain the aviation authority is AESA, applying the EASA certification specifications. Aena is the airport operator — its EXA design specifications sit on top of that framework for the airports it runs.
A point worth getting right first: Aena is not Spain's aviation authority — it is an airport operator. Aena operates most of Spain's civil airports, but the national aviation safety authority is AESA, the Agencia Estatal de Seguridad Aérea. When it comes to which rulebook governs Spanish airfield signs, AESA is the regulator, not Aena.
As an EU member state, Spain works within the EASA framework: aerodrome certification follows the EASA Certification Specifications for aerodrome design, CS-ADR-DSN, which in turn transpose ICAO Annex 14. So the regulatory chain for a Spanish airfield sign runs ICAO → EASA (CS-ADR-DSN) → AESA oversight — the same two colour-coded families as everywhere else.
On top of that regulatory framework, Aena maintains its own design and engineering specifications — the EXA series, such as EXA 40 (2016 edition) — for the airports it operates. These are operator-level standards — how Aena's airports implement and detail the certified requirements — rather than the national aviation regulation. They sit beneath the EASA/AESA rules, not above them, and apply to Aena's own estate rather than to Spanish aerodromes in general.
Because the certified baseline is CS-ADR-DSN, the sign families and colours match the EASA page: mandatory instruction signs are white on red (the runway holding position and no-entry signs) and information signs are black on yellow, inverting to yellow on black for location signs. This page stays at that scope-and-relationship level; Aena's EXA documents are the authority for its specific detailing, and specific dimensions are not reproduced here where they cannot be verified.
Aena is the odd one out in this section: the other entries — ICAO, EASA, the FAA, CAP 168, TP 312 — are regulators or their standards, whereas Aena is an operator working inside the EASA system. The regulations overview makes that distinction explicit.
Wingframe draws airfield guidance signs to the ICAO Annex 14 and EASA CS-ADR-DSN geometry that Spanish airports certify against — the reserved-red rule, the family colours and the legend proportions — so the sign you design matches the standard it will be built and inspected against. See what Wingframe does.