The aircraft, including those systems, equipment and appliances required for type-certification, or by operating rules, must function as intended under any foreseeable operating conditions, throughout, and sufficiently beyond, the operational envelope of the aircraft, taking due account of the system, equipment or appliance operating environment.
1.c.2 Zrakoplov, vključno s sistemi, opremo in napravami, ki se zahtevajo za certifikacijo tipa ali z operativnimi predpisi, mora delovati v vseh predvidljivih obratovalnih pogojih v celotnem območju delovanja zrakoplova in z zadostno varnostno rezervo, kakor je to predvideno, upoštevajoč pri tem okolje, v katerem sistem, oprema in inštrumenti delujejo.