ETSO-C127c

• ED Decision 2022/018/R found in: CS-ETSO Amdt 17 - European Technical Standard Orders (Oct 2026)

#### ETSO-C127c *ED Decision 2022/018/R* ##### Rotorcraft, Transport Aeroplane, and Small Aeroplane Seating Systems **1 Applicability** This ETSO provides the Minimum Performance Standards (MPSs) that rotorcraft, large (transport) aeroplane, and small aeroplane seating systems of the following designated types 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. The standards of this ETSO apply to equipment intended to be utilised as aircraft seating systems of the following classifications: (1) Seat Type and applicable Aircraft Category: (a) Type A Aeroplane. Aircraft Category: Transport (b) Type B Rotorcraft. Aircraft Category: Large (Transport) or Small (Normal) (c) Type C Small Aeroplane. Aircraft Category: (CS‑23 up to Amendment 4) Normal, Utility, Acrobatic, or Commuter; (CS‑23 Amendment 5 and subsequent amendments) Normal Level 1, Normal Level 2, Normal Level 3, Normal Level 4. (2) Seat Subtype: (a) Subtype 1 Passenger (b) Subtype 2 Flight Attendant (c) Subtype 3 Observer (d) Subtype 4 Pilot/Co-pilot (3) Seat Orientation: (a) Forward facing — Installation of forward-facing seating systems in the aircraft at up to an angle of 18° relative to the aircraft longitudinal axis. (b) Rearward facing — Installation of rearward-facing seating systems in the aircraft at up to an angle of 18° relative to the aircraft longitudinal axis. (c) Side facing — Installation of side-facing seating systems in the aircraft at between 80° and 100° relative to the aircraft longitudinal axis. (d) Oblique facing — Installation of forward-facing seating systems in the aircraft, at greater than 18° and no greater than 45° relative to the aircraft longitudinal axis. **2 Procedures** 2.1 General The applicable procedures are detailed in CS-ETSO, [Subpart A](#_DxCrossRefBm920220672). 2.2 Specific None. **3 Technical Conditions** 3.1 Basic The standards of this ETSO apply to equipment intended to be utilised as aircraft seating systems. 3.1.1 Minimum Performance Standard New models of rotorcraft, large (transport) aeroplane, and small aeroplane seating systems identified and manufactured on or after the effective date of this ETSO must meet the requirements in the following standards: — SAE AS8049C, ‘Performance Standard for Seats in Civil Rotorcraft, Transport Aircraft, and General Aviation Aircraft’, dated August 2015, as modified by Appendix 1 to this ETSO; — SAE AS8049/1B, ‘Performance Standards for Side-Facing Seats in Civil Rotorcraft, Transport Aircraft, and General Aviation Aircraft’, dated December 2016, as modified by Appendix 1 to this ETSO; — SAE ARP5526D, ‘Aircraft Seat Design Guidance and Clarifications’, dated July 2015, as modified by Appendix 1 of this ETSO; — SAE AS6316, ‘Performance Standards for Oblique Facing Passenger Seats in Transport Aircraft’, dated June 2017, as modified by Appendix 1 to this ETSO; — SAE ARP6337, ‘Design, Manufacturing, and Performance Standard for Composite Materials Used on Aircraft Seat Structures’, dated November 2020, as modified by Appendix 1 of this ETSO, and by Appendix 2 to this ETSO for specific elective requirements. 3.1.1.1 Functional Qualification Demonstrate the required functional performance under the test conditions specified in: — SAE AS8049C, ‘Performance Standard for Seats in Civil Rotorcraft, Transport Aircraft, and General Aviation Aircraft’, dated August 2015, as amended by Appendix 1 of this ETSO for forward- and aft-facing seats; — SAE AS8049/1B, ‘Performance Standards for Side-Facing Seats in Civil Rotorcraft, Transport Aircraft, and General Aviation Aircraft’, dated December 2016, as modified by Appendix 1 to this ETSO for side-facing seats; — SAE AS6316, ‘Performance Standards for Oblique Facing Passenger Seats in Transport Aircraft’, dated June 2017, as modified by Appendix 1 to this ETSO for oblique-facing seats; — SAE ARP5526D, ‘Aircraft Seat Design Guidance and Clarifications’, dated July 2015, as amended by Appendix 1 to this ETSO; — SAE ARP6337, ‘Design, Manufacturing, and Performance Standard for Composite Materials Used on Aircraft Seat Structures’, dated November 2020, as modified by Appendix 1 to this ETSO; and — Appendix 2 of this ETSO for specific elective requirements. 3.1.2 Environmental Standard Not applicable. 3.1.3 Software Not applicable. 3.1.4 Airborne Electronic Hardware Not applicable. 3.2 Specific 3.2.1 Failure Condition Classification There is no standard minimum failure condition classification for this ETSO. The failure condition classification appropriate for the article will depend on the intended use of the article in a specific aircraft. The loss of function and the malfunction failure condition classifications for which the equipment is designed should be documented. **4 Marking** 4.1 General The permanent and legible marking of at least one major component is required, with all the information as detailed in CS-ETSO, Subpart A, paragraph 1.2. 4.2 Specific The markings must also include the serial number and the following: (1) The specific seat MPS complied with as abbreviated by paragraphs 4.2(1)(a) to 4.2(1)(e) below. Separate each applicable identifier with a dash. For example, a large (transport) aeroplane passenger seat that may be used as a forward facing or rearward facing seat and that meets the step load on the baggage bar standard and the higher static loads must be marked as: Type A-T-1-FF-RF-a-d. (a) The seat type, use: ‘Type A’ for Aeroplane, ‘Type B’ for Rotorcraft, or ‘Type C’ for Small Aeroplane. (b) The seat type shall be followed by the aircraft category, use: ‘T’ for Transport, ‘N’ for Normal, ‘U’ for Utility, ‘A’ for Acrobatic, or ‘C’ for Commuter. If the seat is intended to be used on aircraft compliant with CS‑23 Amendment 5 or later amendments, the seat type must be followed by the aircraft category, use ‘NL’ for Normal and 1, 2, 3, 4 for the aircraft certification level, for example ‘NL1’ for Normal category Level 1, ‘NL2’ for Normal category Level 2, etc. (c) The aircraft category must be followed by the appropriate seat subtype, use: ‘1’ for Passenger, ‘2’ for Flight Attendant, ‘3’ for Observer, or ‘4’ for Pilot/Co‑pilot. (d) The subtype must be followed by the appropriate seat‑facing designation, use: ‘FF’ for Forward Facing, ‘RF’ for Rearward Facing, ‘SF for Side Facing, or ‘OB’ for Oblique Facing. (e) The seat‑facing designations must be followed by the applicable paragraph letter of the elective criteria defined in appendix 2 of this ETSO, use: ‘a’ for Step Load on Baggage Bars, ‘b’ for Electrically Actuated Features, ‘c’ for Secondary Structure Abuse Loads, ‘d’ for Testing to Higher Static Loads, ‘e’ for Hand Holds, ‘f’ for Lithium Containing Batteries, ‘g’ for Flammability — Non-Traditional, Large, Non-metallic Parts. (2) The seating system, safety belt restraint system, and seat cushion part numbers. (3) The document reference that contains the installation instructions and limitations. (4) For Type A and Type B-Transport passenger, flight attendant and observer seating systems, mark each seat cushion to be qualified with ‘Meets the provisions of CS-25, Appendix F, Part II’. Also, mark permanently and legibly the following, with at least the manufacturer’s name, subassembly part number, and the ETSO number: (1) each component that is easily removable (without hand tools); and (2) each subassembly of the article that you determined may be interchangeable. **5 Availability of Referenced Documents** See CS-ETSO, Subpart A, paragraph 3. [Amdt ETSO/11] [Amdt ETSO/17]