navodila za stalno plovnost, ki so jih izdali nosilci certifikata tipa, nosilci dodatnega certifikata tipa in katera koli druga organizacija, ki mora take podatke objavljati v skladu z Delom 21, ter v primeru zrakoplova ali komponent iz tretjih držav, podatki o plovnosti, ki jih je določil organ, odgovoren za pregled nad delovanjem zrakoplova ali komponente.
Instructions for continuing airworthiness, issued by type certificate holders, supplementary type certificate holders, any other organisation required to publish such data by Part-21 and in the case of aircraft or components from third countries the airworthiness data mandated by the authority responsible for the oversight of the aircraft or component;