• Ground Segment Changes CSC-73 - LEOLUTs

  • SUBMISSION DEADLINE:  1 April 2026

  • At CSC-73, the Council decided to approve the list of new changes to ground segment equipment (GSE) and associated implementation dates agreed at JC-39, as shown at Annex 26 to the JC-39 Report, as amended at CSC-73/OPN/SR/Annex 10. The Council invited Ground Segment Providers to report their status of implementation of approved changes to GSE using the survey tool provided by the Secretariat, with a submission deadline of 1 April 2026, to enable consideration at JC-40.

  • A PDF version of this list (for reference purposes only) can be found here:  https://www.cospas-sarsat.int/images/cospas_sarsat/pdf_uploads/2025-06-GSE_changes_complete_list_approved_at_CSC-73.pdf

    Responses are required for all items listed.  Available responses are:

    • Compliant
    • Planned Compliance
    • Non-compliant

    Example explanatory note:

    • system not yet commissioned
    • equipment scheduled to be installed/commissioned in [2027] 

    Note: If there are any questions, concerns, or problems completing this form please contact mail@cospas-sarsat.int

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  •  
    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    LEOLUT-1 Changes in the RLS protocol (per C/S T.001, section A3.3.7
    and Figure A.10, no fixed bits starting in bit 107)    		 Critical Adaptive Jun-17 JC-30 Report, sections 5.1.32 to 5.1.37  C/S T.001 - Issue 4 (CSC-57) section A3.3.7 and Figure A.10
  • LEOLUT-1*
  • LEOLUT-1 Planned Compliance Date
     - -
  •  
    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    LEOLUT-2 Handle new ELT(DT) Location Protocol Routine Enhancement Dec-18 JC-30 Report, sections 5.1.32 to 5.1.37 C/S T.001 - Issue 4 (CSC-57) sections 2.2.1, 3.3, 4.5.5.6 and A3.3.8, and Figure A.11

     

  • LEOLUT-2*
  • LEOLUT-2 Planned Compliance Date
     - -
  •  
    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    LEOLUT-3 Provide data for ELT(DT) incident alert data Critical Enhancement Dec-18 JC-31 Report, section 4.4 and 7.2.16 C/S T.002 - Issue 5 (CSC-59) section 3.2, 4.2.5, 4.2.7 and 5

     

  • LEOLUT-3*
  • LEOLUT-3 Planned Compliance Date
     - -
  •  
    Reference Brief Description Criticality Type Implementation Due Date Joint Committee References Red Book Reference (Council Session) Document Section(s)/Page(s)
    LEOLUT-4 LEOLUT upgrade for the Cospas-14 signals processing Critical Adaptive Dec-19 CSC-62/OPN/SR section 5.x (from CSC-OPN/5/4) C/S T.003 - Issue 5 - Rev.3 (CSC-57) sections 4.1 and 4.1.1

     

  • LEOLUT-4*
  • LEOLUT-4 Planned Compliance Date
     - -

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