IRImplementing rule
ETSO-C47aA1
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.
- 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 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 CSETSO, 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.
ED Decision 2013/012/R
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]
APPENDIX 1 TO ETSO-C47A A1 -MINIMUM PERFORMANCE STANDARDS (MPSS) FOR PRESSURE INSTRUMENTS - FUEL, OIL AND HYDRAULIC
ED Decision 2013/012/R
1.The MPSs applying to this ETSO are provided in SAE AS408C, Pressure Instruments - Fuel, Oil, and Hydraulic, dated July 1, 2001, except for paragraphs 3.1, 3.1.1, 3.1.2, and 3.2.b.
Here are provided the modifications to be applied to the referenced SAE document:
| AS408C | modification: |
|---|---|
| Title | Replace 'Pressure Instruments - Fuel, Oil, and Hydraulic (Reciprocating Engine Powered Aircraft)' Substitute: 'Pressure Instruments - Fuel, Oil, and Hydraulic' |
| Section 1.1 | Replace '…primarily for use with reciprocating engine powered transport aircraft, …' Substitute: '…for use with civil aircraft,...' |
| AS408C section 7 | modification: |
| Para 7.13 | Use test conditions in SAE AS1055 Rev D, 'Fire Testing of Flexible Hose, Tube Assemblies, Coils, Fittings, and Similar System Components', dated June 1, 1997, Sections 4 and 5. |
| Para 7.14 | Section 16, Power Input. |
| Para 7.15 | Section 17, Voltage Spike. |
| Para 7.16 | Section 18, Audio Frequency Conducted Susceptibility - Power Inputs. |
| Para 7.17 | Section 19, Induced Signal Susceptibility |
| Para 7.18 | Section 20, Radio Frequency Susceptibility. |
2.The performance of fuel, oil and hydraulic pressure instruments can be enhanced or made superior to this specification, depending on intended application and configuration.
[Amdt ETSO/3]
[Amdt ETSO/8]
IR · ETSO-C47a — CS-ETSO · CS-ETSO Easy Access Rules · EAR revision 14 Aug 2026