ICAO ACP WGM 8 th MEETING OF THE

ICAO – ACP – WGM – 8 th MEETING OF THE IRIDIUM SUBGROUP 13 – 15 MAR 2007 ICAO 24 -BIT ADDRESS (Mode S code) 13 -15 MAR 2007 Bernard KORSEC 1

ICAO – ACP – WGM – 8 th MEETING OF THE IRIDIUM SUBGROUP 13 – 15 MAR 2007 SEVERAL POSSIBILITIES EXIST QFrom the ATC Mode S Transponders, the ARINC 429 Labels 275 and 276 provide the « ICAO 24 -bit Address » . (ARINC Characteristic 761, Page 31, Attachment 1 -4, Paragraph 3 « ICAO 24 -bit aircraft address » ). QA CM (Configuration Module) mounted externally to the SDU (Satcom Data Unit). REMARKS An ARINC Characteristic for IRIDIUM Satcom, based on the existing « 761 » maybe helpful for SDU manufacturers and operators, knowing that the airplane manufacturers already designed and have sometimes provisioned airplanes for the « ARINC Characteristic 761 » . This will make easy any retrofit to the IRIDIUM System concerning the interfaces between airplane and IRIDIUM SDU. 13 -15 MAR 2007 Bernard KORSEC 2

ICAO – ACP – WGM – 8 th MEETING OF THE IRIDIUM SUBGROUP 13 – 15 MAR 2007 SUGGESTION: Concerning the ICAO 24 -bit Address and the telephone number. QConsidering the following ICAO 24 -bit address in octal coding: 76543210 QWhy not having the ICAO 24 -bit address part of the phone number with a prefix indicating that the present phone number contains an ICAO 24 -bit address: 8816 X 76 543 210 (X indicating a telephone number including an ICAO 24 -bit Address - To be defined by IRIDIUM) QNo mapping required QFrom AES to GES: only the first five digits to be removed before forwarding the message into the ATN. QFrom GES to AES: only the first five digits to be added by IRIDIUM before forwarding the message to the airplane. 13 -15 MAR 2007 Bernard KORSEC 3