This document specifies the dimensions of connections for starting aircraft engines by air, which are necessary to ensure international interchangeability of connectors with adaptors. lt also gives the minimum clearances required on the aircraft to provide adequate access for the ground adaptor.nd edition 2020-06 Aircraft — Connections for starting engines by air Aéronefs — Raccords pour le démarrage à l'air des moteurs Reference number ISO 2026:2020(E) ？ ISO 2020 ISO 2026:2020(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO 2020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publicati