ETSO-C47a A1

• ED Decision 2013/012/R found in: CS-ETSO Amdt 17 - European Technical Standard Orders (Oct 2026)

#### ETSO-C47a A1 *ED Decision 2013/012/R* ##### **Pressure Instruments – Fuel, Oil and Hydraulic** **1 Applicability** This ETSO gives the requirements which fuel, oil and hydraulic pressure instruments that are 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 Aerospace Standard (AS) document: SAE AS 408C “Pressure Instruments - Fuel, Oil and Hydraulic” from July 1, 2001 unless otherwise specified by [Appendix 1](#_DxCrossRefBm920220735) to this ETSO. 3.1.2 Environmental standard Testing fuel, oil, and hydraulic pressure instruments must be in accordance with SAE AS408C section 7 and see CS-ETSO, Subpart A, paragraph 2.1, for environmental test procedures. 3.1.3 Software If fuel, oil, and hydraulic pressure instrument includes a digital computer, see CS-ETSO, Subpart A, paragraph 2.2, for software development. 3.1.4 Airborne electronic hardware See CS-ETSO, Subpart A, paragraph 2.4. 3.2 Specific 3.2.1 Failure condition classification See CS-ETSO, Subpart A, paragraph 2.4. Failure of the function defined in paragraph 3.1.1 of this ETSO has been determined to be a major failure condition. The applicant must develop the system to at least the design assurance level commensurate with this failure condition. **4 Marking** 4.1 General Marking is detailed in CS-ETSO, Subpart A, paragraph 1.2. 4.2 Specific a) At least one major component of the fuel, oil, and hydraulic pressure instrument shall be marked permanently and legibly with all the information as provided for in SAE AS408C, Section 3.2 (except paragraph 3.2.b). b) Mark “Fire resistant” or “Fireproof” information legibly and permanently **5 Availability of referenced document** See CS-ETSO, Subpart A, paragraph 3. [Amdt ETSO/3] [Amdt ETSO/8]