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g) colour of the aircraft.
Note 1.- Vnrioils coding pmtncol.~ urc. nvailable to States.
Dependitlg on the protocol adopted. Smtes nay, at their
discretion, irrciirde one of lhe followirrg as supplernentny
identificatiorr information 10 be r~~yistered:
a) uircrufr operating ngetlcy designator- und operator's
serial nunzber: or
C ) aif-crftn a~ionufitayn d regi~trutionm arks
The n~rcrnft operating agency designator is allocated to the
operuror by lCAO tllmugh t h S~ta te nd~ninistration,a nd the
operaror's serial nrtrnber is allocated by the operatorjionr the
block 0001 to 4096.
Nore 2.- lit their rliscreiion. depending on arrangements in
place. Stutes may include other relevcrrit information to be
regi.rrereJ sirch as the last (lute of register; batrep expiy date
and place of ELT in the aircrnfr (e.g. "primary ELT" or
'clqe-r-cq7N o. 1 ").
5.2 SPECIFICATION FOR THE 121.5 MHZ
COMPONENT OF EMERGENCY
LOCATOR TRANSMITTER (ELT)
FOR SEARCH ANJl RESCUE
Note 1.- Infornrot~on on rechnicnl characteristics and
operational petforrnnnce of 121.5 MHr ELTs is contained in
RTCA Docunerzt DO-IS3 ond European Organization -for
Civil Avlat~orl Equzpment (EUROCAE) Document ED.62.
b) transmitter manufacturer, model and, when available, * COSPAS = Space system far search of vessels in distress;
manufacturer's serial number; SARSAT = Seearch and rescue salellile-aided tracking.
350 ANNEX 10 - VOLUME 111
Part If A~inex 10 - Aerorzarrtical Tclecommunicalions
I\ir~~2e.- Teclr~zi(:iil c1rnracreri.rric.r oj- erneryeilq locator
tro~~sntitteorsp erating cn 12 I. 5 ,hfHz are cont~ri~rcind ITU-R
Reconzmertdatiot~M .690-1. The ITU dcsignatio~rf or an ELT is
Emergency Position - Iridicuting Radio Beacon (EPIRBJ.
5.2.1 Technical characteristics
5.2.1.1 Emergency locator transmitters (ELT) shall
operate on 121.5 MHz. The frequency tolerance shall not
exceed plus or minus 0.005 per ccnl.
5.2.1.2 The emission from an EJdT under normal
conditions and attitudes of the antcnna shall he vertically
polarized and cssentially omnidirectional in the horizonla1
plane.
5.2.1.3 Over a period of 48 hours of continuous operation,
at an operating temperature of minus 2D°C, the peak effective
radiated power (PERP) shall at no time bc less than 50 mW.
5.2.1.4 The type of ertiission shall be A3X. Any othcr
typc of modulation that mects the requirements of 5.2.1.5,
5.2.1.6 and 5.2.1.7 below may bc used provided that it will not
prejudice precise location of the bcacon by homing equipment.
Note.- Sorne ELTs are eqrripped with cLn optional vice
capubilrty (A3E) in addition to the A3X emissio?~.
5.2.1.5 Thc carrier shall he amplitude rnodulatcd at a
modulatipn factor of at least 0.85.
5 . 2 . . The modulatio~i applied to the camcr shall have a
minimum duly cycle of 13 per cent.
5.2.1.7 Thc emission shall have a distinctive audio
characteristic achieved by amplitude modulating (he carrier
with an audio frequency sweeping downward ovcr a range of
not lcss than 700 Hz within the range 1 600 Hz to 300 Hz and
with a sweep repctition rate of between 2 Hz and 4 Hz.
5.2.1.8 After 1 January 1000, the emission shall include a
clearly defined carrier frequency distinct from the modulation
sideband cornponenls; in particular, at leas1 30 per cent or the
power shall be contained at all tirnes within plus or minus
30 Hz of the carrier frequency on 121.5 MHz.
5.3 SFECwICATION FOR THE 406 MEIZ
COMPOXENT OF EMERGESCT
1,OCATOR TRANSlMITTER (ELT)
FOR SEARCH AND RESCCE
5.3.1 Technical characteristics
Note I.- Trmsrnissimn chnractcristia.~ .for 406 MHz
ernergelzcy locator transmitters are contained in ITU-R M.633.
!Vote 2.- Infortnation on technicai clraracteristtcs and
operational p e f i m n c e of 406 MHz ELTs is contoitzed in
RTCA Docurnent 00-204 and European Orgarlization for
Civil Avidtior1 Equipment (EUROCAE) Documcnt ED-62.
5.3.1.1 Emergency locator transmitters shall operate on
onc of the frequency channcls asslgned for use in h e
frcqucncy hand 406.0 to 406.1 MHz.
Note.- The COSPAS-SARSAT 406 MHz channel ns.$igr~ment
plan is contaimcl In COSPAS-SARSAT Docunzent C/S T.012.
5.3.1.2 The period between lransmissions 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 opcrating 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 localor tr6msmitters operating 011
　
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