Bernard KORSEC 113-15 MAR 2007

ICAO 24-BIT ADDRESS(Mode S code)

ICAO – ACP – WGM – 8th MEETING OF THE IRIDIUM SUBGROUP 13 – 15 MAR 2007

Bernard KORSEC 213-15 MAR 2007

ICAO – ACP – WGM – 8th MEETING OF THE IRIDIUM SUBGROUP 13 – 15 MAR 2007

SEVERAL POSSIBILITIES EXIST

From 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 »).

A 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.

Bernard KORSEC 313-15 MAR 2007

ICAO – ACP – WGM – 8th MEETING OF THE IRIDIUM SUBGROUP 13 – 15 MAR 2007

SUGGESTION: Concerning the ICAO 24-bit Address and the telephone number.

Considering the following ICAO 24-bit address in octal coding: 76543210

Why 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 X76 543 210(X indicating a telephone number including an ICAO 24-bit Address - To be defined by IRIDIUM)

No mapping required

From AES to GES: only the first five digits to be removed before forwarding the message into the ATN.

From GES to AES: only the first five digits to be added by IRIDIUM before forwarding the message to the airplane.