ETSO-C89a

• ED Decision 2016/013/R found in: CS-ETSO Amdt 17 - European Technical Standard Orders (Oct 2026)

#### ETSO-C89a *ED Decision 2016/013/R* ##### Crew Member Oxygen Regulator, Demand **1 Applicability** This ETSO provides the requirements which Crew Member Oxygen Regulator, Demand that are designed and manufactured on or after the date of this ETSO must meet in order to be identified with the applicable ETSO marking. **2 Procedures** 2.1 General Applicable procedures are detailed in CS-ETSO, [Subpart A](#_DxCrossRefBm920220672). 2.2 Specific None. **3 Technical Conditions** 3.1 Basic 3.1.1 Minimum Performance Standard Standards set forth in the SAE AS8027, Crew Member Oxygen Regulator, Demand, dated 1 June2004, as modified by [Appendix 1](#_DxCrossRefBm920220791) to this ETSO. Crew member oxygen regulators are separated into four types: Type I: Remote-mounted, panel or portable, Type II: Man-mounted, not mask-mounted, Type III: Mask-mounted, less valving, and Type IV: Mask-mounted, with integral valving. The four types of oxygen regulators are further separated into five classes: Class A: Straight demand, Class B: Diluter demand, Class C: Straight demand, pressure breathing, Class D: Diluter demand, pressure breathing to 40 000 ft, and Class E: Diluter demand, pressure breathing to 45 000 ft. 3.1.2 Environmental Standard Refer to SAE AS8027, paragraph 4.5 3.1.3 Computer Software None. 3.1.4 Electronic Hardware Qualification None. 3.2 Specific None. 3.2.1 Failure Condition Classification See CS-ETSO, Subpart A, paragraph 2.4. **4 Marking** 4.1 General Marking is detailed in CS-ETSO, Subpart A, paragraph 1.2. 4.2 Specific Type and class (refer to paragraph 3), Maximum altitude (per AS8027, paragraph 1.2.3), Inlet supply pressure range (per AS8027, paragraph 3.1.7). **5 Availability of Referenced Document** See CS-ETSO, Subpart A, paragraph 3. [Amdt ETSO/11]