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Approval Standard (CIS T.007).
2.3.6 The ELT digital message shall contain either the
transmitter serial number or an identification of the aircraft or
2. ELT CODING operator as shown below..
2.1 The ELT digital message shall contain information
relating to the message format, coding protocol, country code,
identification data and location data, as appropriate.
2.2 For ELTs with no navigation data provided, the short
message format CIS T.OO1 shall be used, making use of bits
I through 112. For ELTs with navigation data, if provided, the
long message format shall be used, making use of bits
I through 144.
2.3.7 In the serial user and serial user location protocol
(designated by bit 26=1 and bits 37 through 39 being "Oil"),
the serial identification data shall be encoded in binary notation
with the least significant bit on the right. Bits 40 through
42 shall indicate type of ELT serial identification data encoded
where:
- "000 indicates ELT serial number (binary notation) is
encoded in bits 44 through 63;
- "001" indicates aircraft operator (3 letter encoded using
modified Baudot code shown in Table 5-1) and a serial
* COSPAS = Space system for search of vessels in distress; number (binary notation) are encoded in bits 44 through
SARSAT = Search and rescue satellite-aided tracking. 61 and 62 through 73, respectively;
ANNEX 10 - VOLUME 111 2411 1/05
No. 80
Annex 10 - Aeronautical Telecommunications Volame 111
- "01 1" indicates the 24-bit aircraft address is encoded in
bits 44 through 67 and each additional ELT number
(binary notation) on the same aircraft is encoded in bits
68 through 73.
Note.- States will ensure that each beacon, coded with the
country code of the State, is uniquely coded and registered in
a data base. Unique coding of serialized coded beacons can be
facilitated by including the COSPAS-SARSAT Type Approval
Certificate Number which is a unique number assigned by
COSPAS-SARSAT for each approved ELT model, as part of
the ELT message.
2.3.8 In the aviation user or user location protocol (designated
by bit 26=1 and bits 37 through 39 being "OOl"), the
aircraft nationality and registration marking shall be encoded
in bits 40 through 81, using the modified Baudot code shown
in Table 5-1 to encode seven alpha-numeric characters. This
data shall be right justified with the modified Baudot "space"
("100100") being used where no character exists.
2.3.9 Bits 84 and 85 (user or user location protocol) or bit
112 (location protocols) shall indicate any homing transmitter
that may be integrated in the ELT.
2.3.10 In standard and national location protocols. all
identification and location data shall be encoded in binary
notation with the least significant bit right justified. The
aircraft operator designator (3 letter code) shall be encoded in
15 bits using a modified Baudot code (Table 5-1) using only
the 5 right most bits per letter and dropping the left most bit
which has a value of 1 for letters.
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
1
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.
27 36
COUNTRY
1
25
F
C = Certificate flag bit: 1 = to indicate that COSPAS-SARSAT Type Approval Certificate number is encoded in bits 74
through 83 and
0 = otherwise
37
F = Format flag: 0 = Short Message
1 = Long Message
0
27 36
COUNTRY
1
A = Auxiliary radio-locating device: 00 = no auxiliary radio-locating device
01 = 121.5 MHz
11 = other auxiliary radio-locating device
40
37
Note 1.- 10 bits, all 0s or National use.
44 63
DATA
(20 BITS)
1 T
0
27 36
COUNTRY
Note 2.- COSPAS-SARSAT Type Approval Certificate number in binary notation with the least significant bit on the right, or
National use.
?
40
37
Note 3.- Serial number, in binary notation with the least significant bit on the right, of additional ELTs carried in the same
aircraft or default to 0s when only one ELT is carried.
　
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