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Telecommunication Union (ITU) country code shown in
Table I of Appendix 43 of the ITW Radio Regulations.
2.3.5 Bits 37 through 39 shall designate one of the user
protocols where values "001" and "01 1" are used for aviation
as shown in the examples contained in this Appendix.
b) 24-bit aircraft address; 2.3.6 The ELT digital message shall contain either the
C) aircraft nationality and registration marks.
- -
transmitter serial number or an identification of the aircraft or
operator in bits 40 through 83 as shown below. This
1.4 All ELTs shall be designed for co-operation with the information shall be encodedin binary notation with the least
COSPAS-SARSAT* system and be type approved. significant bit on the right, or using the modified Baudot code
shown in Table 5- 1.
Note.- Transmission characteristics of the ELT signal can
be confirmed by making use of the COSPAS-SARSAT Type 2.3.7 In the serialized user protocol (designated by bits 37
Approval Standard (C-S 2007). through 39 being "01 1") bits 40 through 42 shall indicate type
of beacon where:
2. ELT CODING - "000" indicates ELT serial number is encoded in bits 44
through 63;
2.1 The ELT digital message contains information
relating to the message format, coding protocol, country code - "001" indicates aircraft operator and a serial number are
and identification data consisting of one of the information encoded in bits 44 through 61 and 62 through 73,
elements listed in 1.3 above. respectively;
2.2 For ELTs with no navigation data provided, the short - "01 1" indicates the 24-bit aircraft address is encoded in
message format described in ITU/R M633/1 shall be used, bits 44 through 67 and each additional ELT on the same
making use of bits 1 through 112. aircraft is numbered in bits 68 through 73.
2.3 Protected data field
Note.- States will ensure that each beacon, coded with the
country code of the State, is uniquely coded and registered in
2.3.1 The protected data field consisting of bits 25
through 85 shall be protected by an error correcting code, and
shall be the portion of the message which shall be unique in * COSPAS = Space system for search of vessels in distress;
cvery distress beacon. SARSAT = Search and rescue satellite-aided tracking.
ANNEX 10 - VOLUME 111 4/11/99
No. 74
Annex I0 - Aeronautical Telecommunications Volume ZZZ
a data base. Unique coding of $<,I-ializedc oded beacons can be
ficilitated by including the COSPAS-SARSAT Tjpe Approval
Ce rtificute Number wliich is a unique number assigned - by
COSPAS-SARSATfor each approved ELT model, us part of the
ELT rnessuge.
2.3.8 In the aviation user protocol (designated by bits 37
through 39 being "OOl"), the aircraft nationality and registration
marking shall be encoded in bits 40 through 81, using
the modified Baud01 code shown in Table 5- 1 to encode seven
alpha-numeric characters. This data shall be right justified with
the modified Baudot space ("lFK1100) being used where no
character exists.
2.3.9 Bits 84 and 85 shall indicate any homing lransmitter
that may be integrated in the ELT.
Table 5-1. Modified Baudot Code
Code Code
Letter MSB LSB Figure MSB LSB
MSB = most significant bit
LSB = least significant bit
* = hyphen
* * = space
Annex 10 - Aeronautical Telecommunications
EXAMPLES OF CODING
ELT serial number
Aircraft address
25
F
Aircraft operator designator and serial number
1
25
F
Aircraft registration marking
27 36
COUNTRY
25
F
T = Beacon type TIT = 000 indicates ELT serial number is encoded;
= 001 indicates operating agency and serial number are encoded;
= 01 1 indicates 24-bit aircraft address is encoded.
1
1
27 36
COUNTRY
25
F
C = Certificate flag bit: 1 = to indicate that COSPAS-SARSAT Qpe Approval Certificate number is encoded in bits 74
through 83 and
0 = orhenvise
44 63
'"IAL DATA
(20 BITS)
27 36
COUNTRY
44 67
(24 BITS)
F = Format flag: 0 = Short Message
I = Long Message
37 85
74 83
SEE NOTE 2
68 73
SEE NOTE 3
37
A = Auxiliary radio-locating device: 00 = no auxiliary radio-locating device
01 = 121.5 MHz
11 = other auxiliary radio-locating device
64 73
0 SEE NOTE 1
40
A
0
40
37
1
Note I.- I0 bits, all 0s or National use.
74 83
T SEE NOTE 2 A
T
85
0
27 36
COUNTRY
Note 2.- COSPAS-SARSAT Type Approval Certificate number in binary notation with the least significant bit on the right, or
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