DIN EN 4856:2022-12 航空航天系列 - 旋翼机紧急呼吸系统 (EBS) - 要求、测试和标记
Aerospace series - Rotorcraft Emergency Breathing Systems (EBS) - Requirements, testing and marking; German and English version FprEN 4856:2022 / Note: Date of issue 2022-11-11*Intended as replacement for DIN EN 4856 (2020-02).