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characteristics contained in 5.2.1.8.
5.1.2 All installations of emergency locator transmitters
operating on 406 MHz shall meet the provisions of 5.3.
5.1.3 All installations of emergency locator transmitters
operating on 121.5 MHz shall meet the provisions of 5.2.
5.1.4 From 1 January 2005, emergency locator
transmitters shall operate on 406 MHz and 121.5 MHz
simultaneously.
5. I .5 All cmergency locator transmitters installed on or
after 1 January 2002 shall operate sirnl~ltaneously on 406 MHz
and 121.5 MHz.
5.1.6 The technical characteristics for the 406 MHz
component of an integrated ELT shall be in accordance
with 5.3.
5.1.7 The technical characleristics for the 121.5 MHz
component of an integrated ELT shall be in accordance
with 5.2.
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 SPECIFICATION FOR THE 121.5 MHz
COMPONENT OF EMERGENCY
LOCATOR TRANSMITTER (ELT)
FOR SEARCH AND RF,SCUE
Note 1.- Information on technical clzaracteristics atad
operation.al perfarmance of 121.5 MHz ELTs is contained in
RTCA Document 00-183 and European Organizution fbr
Civil Aviation E4uipmen.t (EUROCAE) Document ED.62.
Note 2.- Technical characteristics of emergency locator
transmitters operating on 121.5 MHz are contained in ITU-R
Recommendation M.690-I. The lTU designation for an ELT is
Emergency Position - Indicating Radio Beacon (EPIRB).
5.2.1 Technical characteristics
5.2.1.1 Emergency locator transmitters (ELT) shall
operate o'n 121.5 MHz. The frequency tolerance shall not
exceed plus or minus 0.005 per cent.
5.2.1.2 Thc emission from an ELT under normal
conditions and attitudes of the antenna shall be vertically
polarized and essentially omnidirectional in the horizontal
plant.
5.2.1.3 Over a period of 48 hours of continuous operation,
at an operating temperature of minus 20°C the peak effective
radiated power (PERP) shall at no time be less than 50 mW.
5.2.1,.4 The type of emission shall be A3X. Any other
type of modulation that meets the requirements of 5.2.1.5,
5.2.1.6 and 5.2.1.7 below may be used provided that it will not
prejudice precise location of the beacon by homing equipment.
Note.- Some ELTs are equipped with an optional voice
capability (A3E) in addition to the A3X emission.
5.2.1.5 The carrier shall be amplitude modulated at a
modulation factor of at least 0.85.
5.2.1.6 The modulation applied to the carrier shall have a
minimum duty cycle of 33 per cent.
5.2.1.7 The emission shall have a distinctive audio
characteristic achieved by amplitude modulating the carrier
with an audio frequency sweeping downward over a range of
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.
5.2.1.8 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 ccnt of the
power shall be contained at all times within plus or minus
30 Hz of the carricr frequency on 121.5 MHz.
1/11/U1
No. 76
ANNEX 10 - VOLUME 111
Part I1 Annex 10 - Aeronautical Telecommunications
5.3 SPECIFICATION FOR THE 406 MHZ
COMPONENT OF EMERGENCY
LOCATOR TRANSMITTER (ELT)
FOR SEARCH AND RESCUE
5.3.1 Technical characteristics
Note 1.- Transmission characteristics for emergency
locator transrnirters operating on 406 MHz are contained in
ITU-R Recammendation M.633-I.
Note 2.- Information on technical characteristics and
operational performance of 406 MHz ELTs is contuined in
RTCA Document 130-204 and European Organization far
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 -20°C; 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 bc 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
　
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