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elements:
a) aircraft operating agency designator and a serial
number from 0001 to 4096;
2.3.3 A protocol flag is indicated by bit 26 and shall be
value "1".
2.3.4 A country code, which indicates the State where
additional data are available on the aircraft on which the ELT
is carried, is contained in bits 27 through 36 which designate
a three-digit decimal country code number expressed in binary
notation.
Note.- Country codes are based on the International
Telecommunication Union (ITU) count9 code shown in
Table I of Appendix 43 of the ITU Radio Regulations.
2.3.5 Bits 37 through 39 designate one of the user
protocols where values "001" and "011" are used for aviation
as shown in the examples contained in this Appendix.
b) 24-bit aircraft address; 2.3.6 The ELT digital rnessagc shall contain either the
transmitter serial number or an identification of the aircraft or
c) aircraft nationality and registration marks. operator in bits 40 through 83 as shown below. This
information shall be encoded in binary notation with the least
1.4 ~ 1E1LT ~sh all be designed for co-operation with he significant bit on the right, or using the modified Baudot code
COSPAS-SARSAT* system and be type approved. shown in Table 5-1.
Note.- Transmission char~cteristicso fthe ELT signul can 2.3.7 In the serialized user protocol (designated by bits
be confimed by makirlg use of the c 0 s p ~ s - s ~ ~ ~37 ~thr~oug h 39 being "011") bits 40 through 42 indicate type
Approval Standard (C-S 2007). of beacon where:
- "000" indicates ELT serial number is encoded in bits
44 through 63;
2. ELT CODING - "001" indicates aircraft operator and a serial number
are encoded in bits 44 through 61 and 62 through 73,
2.1 The ELT digital message contains information respectively;
relating to the message format, coding protocol, country code
and identification data consisting of one of the information * C-S~AS = Space for sewch of veswls in dismess;
elements listed in 1.3 above. SARSAT = Search and rescue satcllite-aided tracking.
ANNEX 10 - VOLUMT 111
7/11/96
No. 71
Annex 10 - Aeronautical Telecommunications Volume I11
- "01 1" indicates the aircraft 24-bit address is encoded
in bits 44 through 67 and each additional ELT on the
same aircraft is numbered 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 protocol (designated by bits 37
through 39 being "OOI"), 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 indicate any homing transmitter
that may be integrated in the ELT.
Table 5-1. Modified Baudot Code
Code Code
LRtter MSB LSB Figure MSB LSB
MSB = most significant bit
LSB = least significant bit
* = hyphen
** = space
7/11/96
No. 71
EXAMPLES OF CODING
ELT serial number
Annex 10 - Aeronautical TeZecommunicutions
Aircraft address
Aircraft operator designator and serial number
25
F
85
A
Aircraft registration marking
1 A
37
68 73
SEE NOTE
3
74 83
SEE NOTE
F7 36
COUNTRY
25
F
T = Beacon type ??T = 000 indicates ELT serial number is encoded;
= 001 indicates operating agency and serial number are encoded;
= 011 indicates 26bit aircraft address is encoded.
1
40
0
1
85
25
F
85
C = Certificate flag bit; 1 = to indicate that COSPAS-SARSAT Type Approval Certificate number is encoded in bits 74 though
83 and
0 = otherwise
44 63
NUMBER DATA
(20 BITS)
1 T
27 36
COUNTRY A
1 A
25
F
P = Formar Rag: 0 = Short Message
1 = Long Message
A
27 36
COUNTRY A
27 36
1 COUNTRY
A = Auxiliary radio-locating device: 00 = no auxiliary radio-locating device
01 = 121.5 MHz
11 = other auxiliary radio-locating device
64 73
SEE NOTE 1
44 67
24-BIT AIRCRAFT ADDRESS
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