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5.2.1.6 The modulation applied to the carrier shall have a 5.1.6 The technical characteristics for the 406 MHz
minimum duty cycle of 33 per cent.
component of an integrated ELT shall be in accordance with
5.3.
5.2.1.7 The emission shall have a distinctive audio
5.1.7 The technical characteristics for the 121.5 MHz characteristic achieved by amplitude modulating the carrier
component of an integrated ELT shall be in accordance with with an audio frequency sweeping downward over a range of
5.2. not less than 700 Hz within the range 1 600 HZ to 300 Hz and
with a sweep repetition rate of between 2 Hz and 4 Hz.
5.1.8 States shall make arrangements for a 406 MHz ELT
register. Register information regarding the ELT shall be
immediately available to search and rescue authorities. 5.2.1.8 After I January 2000, the emission shall include a
clearly defined carrier frequency distinct from the modulation
sideband components; in particular, at least 30 per cent of the
5.2 SPECIFICATION FOR THE 121.5 MHz power shall be contained at all times within plus or minus
COMPONENT OF EMERGENCY 30 Hz of the carrier frequency on 121.5 MHz.
LOCATOR TRANSMITTER (ELT)
FOR SEARCH AND RESCUE
Note.- Infonnation on technical characteristics and 5.3 SPECIFICATION FOR THE 406 MHZ
operational peiformance of 12.1.5 MHz ELTs as contained in COMPONENT OF EMF,RGENCY
RTCA Document 00-183 and European Organization for LOCATOR TRANSMITTER (ELT)
Civil Aviation Equipment (EUROCAE) Document ED.62. FOR SEARCH AND RESCUE
5.2.1 Technical characteristies 5.3.1 Technical characteristics
5.2.1.1 Emergency locator transmitters (ELT) shall Note 1.- Tmnsmission characteristics for emergency
operate on 121.5 MHz. The frequency tolerance shall not locator transmitters operating on 406 MHz are contained in
exceed plus or minus 0.005 per cent. ITU/R M633/l.
350 ANNEX 10 - VOLUME 111
Part I1 Annex 10 - Aeronautical Tekcommunications
Note 2.- Information on technical chamcteristics and
operational performance of 406 MHz ELTs is contained in
RTCA Document 00-204 and European Organization for
Civil Aviation Equipment (EUROCAE) Document ED.62.
5.3.1.1 Emergency locator transmitters shall operate on a
frequency of 406.025 MHz plus or minus 2 kHz. The
transmitted frequency shall not vary more than plus or minus
5 kHz in five years including the initial frequency offset. It
shall not vary more than 2 parts in lo9 in 100 milliseconds.
5.3.1.2 The period between transmissions shall be
50 seconds plus or minus 5 per cent.
5.3.1.3 Over a period of 24 hours of continuous operation
at an operating temperature of -2OoC, the transmitter power
output shall be within the limits of 5 W plus or minus 2 dB.
5.3.1.4 The 406 MHz ELT shall be capable of transmitting
a digital message.
5.3.2 Transmitter
identification coding
5.3.2.1 Emergency locator transmitters operating on
406 MHz shall be assigned a unique coding for identification
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 user protocols described in Appendix I
to this chapter, and shall be registered with the appropriate
authority.
APPENDIX 1 TO CHAPTER 5. EMERGENCY LOCATOR
TRANSMITTER CODING
(see Chapter 5, 5.3.2)
Note.- A detailed description of beacon coding is 2.3.2 A message format flag indicated by bit 25 shall be
contained in ITU/R M633/1. The following information is set to "0" to indicate the short message format or set to "1" to
specpc to emergency locator tranrmitters used in aviation. indicate the long format for ELTs capable of providing
location data.
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 BLT andlor
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;
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.
Note.- Country codes are based on the International
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