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of the transmitter or aircraft on which it is carried.
5.3.2.2 The emergency locator transmitter shall be
coded in accordance with either the aviation user protocol or
one of the serialized uscr protocols described in Appendix 1
to this chapter, and shall be rcgistered with the appropriate
authority.
APPENDIX 1 TO CHAPTER 5. EMERGENCY LOCATOR
TRANSMITTER CODING
(see Chapter 5, 5.3.2)
Note.- A detailed descriptiot~ of beacon coding is
contained in ITU-R Recommendation M.633-1. The *following
information is spec@ to emergency locator transmitters used
in aviation.
1. GENERAL
1.1 The emergency locator transmitter (ELT) operating on
406 MHz has the capacity to transmit a programmed digital
message which contains information related to the ELT and/or
the aircraft on which it is carried.
1.2 The ELT shall be uniquely coded in accordance with
1.3 below and be registered with the appropriate authority.
1.3 The ELT digital message shall contain either the
transmitter serial number or one of the following information
elements:
a) aircraft operating agency designator and a serial number
from 0001 to 4096;
b) 24-bit aircraft address;
c) aircraft nationality and registration marks.
1.4 All ELTs shall be designed for co-operation with the
COSPAS-SARSAT* system and be type approved.
Note.- Transmission characteristics of the ELT signal can
be confirmed by making use of t17e COSPAS-SARSAT Type
Approval Standard (C-S E007).
2. ELT CODING
2.1 The ELT digital message contains information
relating to the message format, coding protocol, country code
and identification data consisting of one of the information
elements listed in 1.3 above.
2.2 For ELTs wilh no navigation data provided, the short
message format described in ITU-R Recommendation
M.633-1 shall be used, making use of bits 1 through 112.
2.3 Protected data field
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
every distress beacon.
2.3.2 A message format flag indicated by bit 25 shall be
set to "0" to indicate the short message format or set to "1" to
indicate the long format for ELTs capable of providing
location data.
2.3.3 A protocol flag shall be indicated by bit 26 and shall
be set to "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, shall be contained in bits 27 through 36 which
designate a three-digit decimal country code number expressed
in binary notation.
2.3.5 Bits 37 through 39 shall designate one of the user
protocols where values "001" and "011" are used for aviation
as shown in the examples contained in this Appendix.
2.3.6 The ELT digital message shall contain either the
transmitter serial number or an identification of the aircraft or
operator in bits 40 through 83 as shown below. This
information shall be encoded in binary notation with the least
significant bit on the right, or using the modified Baudot code
shown in Table 5- 1.
2.3.7 In the serialized user protocol (designated by bits 37
through 39 being "01 1") bits 40 through 42 shall indicate type
of beacon where:
- "000" indicates ELT serial number is encoded in bits 44
through 63;
- "001" indicates aircraft operator and a serial number are
encoded in bits 44 through 61 and 62 through 73,
respectively;
- "01 1" inhcates the 24-bit aircraft address is encoded in
bits 44 through 67 and each additional ELT on the same
aircraft i s numbered in bits 68 through 73.
* COSPAS = Space system for search of vcsseIs in distress; Note.- Stutes will ensure thar each beacon, coded with the
SARSAT = Search and rescue satellite-aided tracking. country code of tlze State, is uniquely coded urzd registered in
ANNEX 10 - VOLUME 111 353 1/11/01
Anrtex 10 - Aero~zaulical Telecommunications
a data base. Unique coding of scriali~edc oded beacons call he
facilitated by including tlze COSPAS-SARSAT f i p ~Ap proval
CertGcate 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 "OOln), 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
　
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