--- title: "ETSO-C132b — CS-ETSO · Avioverse" description: "GEOSYNCHRONOUS ORBIT AERONAUTICAL MOBILE SATELLITE SERVICES AIRCRAFT EARTH STATION EQUIPMENT 1 Applicability This ETSO gives the requirements which…" url: "https://avioverse.aero/regulations/easa/cs-etso/subpart-b/etso-c132b" --- # ETSO-C132b European Technical Standard Orders (CS-ETSO) · CS-ETSO · EAR revision 1 Oct 2026 IR Implementing rule ## ETSO-C132b GEOSYNCHRONOUS ORBIT AERONAUTICAL MOBILE SATELLITE SERVICES AIRCRAFT EARTH STATION EQUIPMENT 1 Applicability This ETSO gives the requirements which Geosynchronous Orbit Aeronautical Mobile Satellite Services (AMSS) aircraft earth station equipment that is 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. 2.2 Specific None. 3 Technical Conditions 3.1 Basic 3.1.1 Minimum Performance Standard Standards set forth in RTCA document DO 210D ‘MOPS for Geosynchronous Orbit Aeronautical Mobile Satellite Services (AMSS) avionics’ Section 2.0 dated April 19, 2000 including Change 1, dated December 14, 2000, Change 2, dated November 28, 2001, Change 3 dated September 19, 2006; Change 4, dated March 24, 2015; and Change 5, dated 26 March 2020. AMSS aircraft earth station (AES) equipment manufactured under ETSO-C132a can be upgraded to this ETSO by replacing the Diplexer Low Noise Amplifier (DLNA) with one identified and manufactured using this ETSO. Functionality. This ETSO’s standards apply to AMSS AES equipment that provides direct worldwide communications between aircraft subnetworks and ground subnetworks using aeronautical mobile satellites in geosynchronous orbit and their ground earth stations. AMSS will support both data and voice communications between aircraft users and ground-based users, such as air route traffic control centres (ARTCC) and aircraft operators. Communication services with AMSS functions include four categories: air traffic services (ATS), aircraft operational control (AOC), aeronautical administrative communications (AAC), and aeronautical passenger communications (APC). 3.1.2 Environmental Standard See CS-ETSO Subpart A paragraph 2.1. 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 See CS-ETSO Subpart A paragraph 2.4. (1) Failure of the function defined in paragraph 3.1.1 is a minor failure condition. (2) Loss of the function defined in paragraph 3.1.1 of this ETSO is a minor failure condition. Satellite communication is a supplemental service operation, with high frequency (HF) radio required for primary communication. The loss of satellite communication is mitigated by availability of HF communications. (3) AMSS equipment is intended for procedural airspace area operations. FAA determined the failure condition specified in paragraph 3.2.1 of this ETSO based on AMSS equipment operating as an approved long-range communication system (LRCS) in oceanic airspace area environments. Use of AMSS equipment in other operating environments (for example, high-density terminal/en-route domestic airspace) may impact equipment performance and safety considerations. Note: Equipment authorised in accordance with this ETSO may not be approved for use in dual satellite communications (SATCOM) or dual-dissimilar SATCOM configurations if the failure condition classification for the design was ‘minor’. 4 Marking 4.1 General Marking is detailed in CS-ETSO Subpart A paragraph 1.2. 4.2 Specific In addition, mark the DLNA subassemblies permanently and legibly, with at least the manufacturer’s name, the subassembly part number and this ETSO number. 5 Availability of Referenced Document See CS-ETSO Subpart A paragraph 3. \[Amdt ETSO/3] \[Amdt ETSO/12] \[Amdt ETSO/18] IR · ETSO-C132b — CS-ETSO · CS-ETSO Easy Access Rules · EAR revision 1 Oct 2026 [All rules in SUBPART B – LIST OF ETSOs](https://avioverse.aero/regulations/easa/cs-etso/subpart-b) Consolidated from the EASA Easy Access Rules (revision 1 Oct 2026, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.