ED Decision 2020/011/R
1 Abpplicability
This ETSO provides the requirements which combustion heaters and accessories 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
The 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
The applicable standards are those provided in SAE International’s Aerospace Standard AS8040B, Heater, Aircraft, Internal Combustion Heat Exchanger Type, dated 14 February 2013, as amended by Appendices 1 and 2 to this ETSO.
3.1.1.1 Functionality
This standard in this ETSO applies to equipment that is intended to provide heated air for civil aircraft.
Note: For combustion heaters and accessories, the maintenance and inspection items contained in the instructions for continued airworthiness play an important role in preventing failures that result in combustion by-products entering the cabin/flight deck.
3.1.2 Environmental Standard
The required performance under the test procedures in SAE AS8040B, Heater, Aircraft, Internal Combustion Heat Exchanger Type, dated 14 February 2013, as amended by Appendix 1 to this ETSO, using standard environmental conditions and test procedures that are appropriate for airborne equipment, shall be demonstrated.
3.1.3 Software
See CS-ETSO, Subpart A, paragraph 2.2.
3.1.4 Airborne Electronic Hardware
See CS-ETSO, Subpart A, paragraph 2.3.
3.2 Specific
3.2.1 Failure Condition Classification
(1) A failure of the function defined in paragraph 3.1.1.1 of this ETSO is a major failure condition.
(2) A loss of the function defined in paragraph 3.1.1.1 of this ETSO is a minor failure condition.
(3) Design the system to at least fulfil these failure conditions above.
4 Marking
4.1 General
See CS-ETSO, Subpart A, paragraph 1.2.
4.2 Specific
If the article includes software and/or airborne electronic hardware, then the part numbering scheme for the article must identify the configuration of both the software and the airborne electronic hardware. The part numbering scheme can use separate, unique part numbers for the software, the hardware, and the airborne electronic hardware.
If the combustion heater includes a deviation from this ETSO, the marking must include a means to indicate that a deviation was granted.
5 Availability of Referenced Document
See CS-ETSO, Subpart A, paragraph 3.
[Amdt ETSO/16]
ETSO-C20a requires combustion heaters and accessories to meet SAE AS8040B standards, with failure classified as major and loss as minor, and marking must indicate deviations.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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