International Civil Aviation Organization

TECHNICAL AND OTHER INFORMATION

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TECHNICAL AND OTHER INFORMATION
Band: 117.975–137 MHz

Service: AM(R)S

Aviation use: Air-ground and air-air communication (VHF voice and data)

Annex 10:

SARPs: Annex 10, Volume III, Part II, Chapter 2, 2.1, 2.2 and 2.3

Frequency plan: Annex 10, Volume V, Chapter 4, 4.1

Channelization: 25 kHz/8.33 kHz

Planning criteria: Annex 10, Volume V, Attachment A

RTCA MOPS: DO-186A, MOPS for airborne radio communications equipment operating within the radio frequency range 117.975–137 MHz (1995)

DO-271B Minimum Operational Performance Standards for Aircraft VDL Mode 3 Transceiver Operating in the Frequency Range 117.975-137.000 MHz

DO-281 Minimum Operational Performance Standards for Aircraft VDL Mode 2 Physical, Link and Network Layer
Eurocae MPS: ED-23B

ARINC characteristic: 716‑7, 750 (Data)

ITU Res./Rec.:

• Rec. No. 714 (Mob-87): Compatibility between the aeronautical mobile (R) service in the band 117.975–137 MHz and sound broadcasting stations in the band 87.5–108 MHz

ITU‑R: ITU‑R IS.1009: Compatibility between the sound broadcasting service in the band 87–108 MHz and the aeronautical services in the band 108–137 MHz

Other material:

• RTCA DO-225, VHF air-ground communications system improvements alternatives study and selection of proposals for future action (1994)

• RTCA DO-224A: Signal-in-space MASPS for advanced VHF digital data communications including compatibility with digital voice techniques (1994)

• RTCA DO-176, FM broadcast interference related to airborne ILS, VOR and VHF communications (1981)

Frequencies : 121.5 MHz, 123.1 MHz and 243 MHz (mobile)

Service: AM(R)S

Aviation use: Emergency frequencies for use in aircraft emergencies and in ELT (121.5 MHz) and for search of scene communication (123.1 MHz).

Emergency frequency in mobile service (243 MHz): The frequency 243 MHz (twice that of the aeronautical emergency frequency 121.5 MHz) is designated by the Radio Regulations (see Annex 10, Volume V, Chapter 2 — Distress frequencies and Radio Regulation 5.256) for use in distress situations. Survival craft stations using VHF (ELT and EPIRB) are normally fitted with both 121.5 MHz and 243 MHz.

Commentary: None

Footnotes: 5.256

ICAO POLICY
No change to the provisions in Chapter VII and Appendix 13 relating to the use of 121.5 MHz, 123.1 MHz and 243 MHz.

TECHNICAL AND OTHER INFORMATION
Frequency: 121.5 MHz, 123.1 MHz and 243 MHz

Annex 10:

SARPs: Annex 10, Volume III, Part II, Chapter 5

Frequency plan: Annex 10, Volume V, Chapter 4

Channelization: None

Planning criteria: None

RTCA MOPS:

DO-183, MOPS for emergency locator transmitters operating on 121.5 and 243 MHz

Eurocae MPS: None

ARINC characteristic: None

ITU Res./Rec.:

• Resolution 18 (Mob‑83) relating to the procedure for identifying and announcing the position of ships and aircraft of States not parties to an armed conflict

• Rec. 604 (Rev. Mob‑87): Future use and characteristics of emergency position‑indicating radio beacons (EPIRBs)

ITU‑R: ITU-R M.690-1: Technical characteristics of emergency position-indicating radio beacons (EPIRBs) operating on the carrier frequencies of 121.5 MHz and 243 MHz

Other material:

• ITU Radio Regulations, Chapter VII and Appendix 13

• DO-182, ELT equipment installation and performance (1982)

INTENTIONALLY LEFT BLANK
Band: 328.6–335.4 MHz Service: Aeronautical radionavigation (ILS glide path)
Allocation:

MHz 328.6–335.4
Allocation to Services
Region 1	Region 2	Region 3
328.6–335.4	AERONAUTICAL RADIONAVIGATION 5.258 5.259
Footnotes: 5.258 The use of the band 328.6–335.4 MHz by the aeronautical radionavigation service is limited to Instrument Landing Systems (glide path). 5.259 Additional allocation: in Egypt, Israel, Japan, and Syria, the band 328.6–335.4 MHz is also allocated to the mobile service on a secondary basis, subject to agreement obtained under No. 9.21. In order to ensure that harmful interference is not caused to stations of the aeronautical radionavigation service, stations of the mobile service shall not be introduced in the band until it is no longer required for the aeronautical radionavigation service by any administration which may be identified in the application of the procedure invoked under No. 9.21.

ICAO POLICY
• No change to current allocation to the aeronautical radionavigation service.

• No change to Footnote 5.258.

• Deletion of Footnote 5.259.

AVIATION USE: Footnote 5.258 limits the use of this band to ILS glide path. Frequencies are used at a spacing of 150 kHz (Annex 10, Volume I, Chapter 3, 3.1.6.1) and are paired with those of the ILS localizer (see Figure 7-8 in the section on 108–117.975 MHz).
COMMENTARY: ICAO policy for the future need and use of this allocation is described in detail in the general policy for the use of ILS (see ILS localizer at 108–117.975 MHz).

Use of the band by other services
Footnote 5.259 was inserted by the ITU WARC‑87. This footnote uses the same text (except for the list of countries) as Footnote 5.197 for the ILS localizer and VOR band at 108–117.975 MHz. At WRC-2000, most of the countries listed removed their name from this footnote. The remaining country names must now also be deleted to protect ILS glide path services in these areas and to avoid the possibility of new names being added at a future conference.

TECHNICAL AND OTHER INFORMATION
Band: 328.6–335.4 MHz

Service: Aeronautical radionavigation

Aviation use: ILS glide path

Annex 10:

SARPs: Annex 10, Volume I, Chapter 3, 3.1.5

Frequency plan: Annex 10, Volume I, Chapter 3, 3.1.6

Channelization: 300 kHz or 150 kHz spacing

Planning criteria: as for ILS localizer

RTCA MOPS: DO-192, MOPS for airborne ILS glide slope receiving equipment operating within the radio frequency range of 328.6–335.4 MHz (1986)

Eurocae MPS:

ARINC characteristic: 551

ITU Res./Rec.:

ITU‑R:

Other material:

Band: 406–406.1 MHz Service: Mobile-satellite (Earth‑to‑space) (search and rescue)
Allocation:

MHz 406–406.1
Allocation to Services
Region 1	Region 2	Region 3
406–406.1	MOBILE-SATELLITE (Earth-to-space)
	5.266 5.267
Footnotes: 5.266 The use of the band 406–406.1 MHz by the mobile-satellite service is limited to low power satellite emergency position-indicating radiobeacons (see also Article 31 and Appendix 13).
5.267 Any emission capable of causing harmful interference to the authorized uses of the band 406–406.1 MHz is prohibited.

ICAO POLICY
• .

• No change to the allocation to the band 406-406.1and the Footnotes 5.266 and 5.267.

• No change to the provisions of RR Appendix 13 relating to the use of the band 406 – 406.1 MHz

• Secure protection of Emergency Locator Transmitters (ELT) which are used in aviation

AVIATION USE: This one-way (Earth-to-space) satellite service is for use with satellite emergency position indicating radio beacons (EPIRB) currently operating on the nominal frequency of 406.025 MHz. The COSPAS/SARSAT service, part of the global maritime distress and safety system (GMDSS) which receives the distress transmissions and relays back to Earth, is a joint enterprise operated on a multinational basis for the benefit of all users. The use of EPIRBs or ELTs operating in the frequency band 406-406.1 MHz is standardized in Annex 10, Vol. III, Part II, Chapter 5 and Vol. V, Chapter 2. Carriage requirements for ELT are contained in Annex 6.
COMMENTARY: ICAO participates with the International Maritime Organization (IMO) and other international bodies in discussions on the global aspects of search and rescue which encompass the use and deployment of this frequency.

Recent cases of serious interference from non‑emergency sources have caused concern on the effectiveness of COSPAS/SARSAT services (see also ITU Resolution 205 (Rev. Mob-87)). A frequency management plan for the band 406-406.1 has been developed by COSPAS/SARSAT.

TECHNICAL AND OTHER INFORMATION
Band: 406–406.1 MHz

Service: Mobile-satellite (Earth-to-space)

Aviation use: Search and rescue

Annex 10:

SARPs: Annex 6, Annex 10, Volume III, Part II, Chapter 5 and Appendix 1 to Chapter 5 and Annex 10, Vol. V, Chapter 2.

RTCA MOPS: DO-204 Change 3, MOPS for 406 MHz emergency locator transmitters (ELT) (2001)
Eurocae MOPS: ED-62, MOPS for 406 MHz emergency locator transmitters (ELT)

ARINC characteristic:

ITU Res./Rec.: Res. No. 205 (Rev. Mob-87): Protection of the band 406–406.1 MHz allocated to the mobile-satellite service

ITU-R: ITU-R M.633 Transmission characteristics of a satellite position indicating radio beacon (satellite EPIRB) system operating through a low polar orbiting satellite system in the 406 MHz band

ITU-R M.1478 Protection criteria for COSPAS/SARSAT search and rescue processors in the band 406-406.1 MHz.

CCIR:

Other material: COSPAS/SARSAT Doc. C/S T.001; Specifications for COSPAS/SARSAT 406 MHz distress beacons

COSPAS/SARSAT Doc. C/S T.012; 406 MHz frequency management plan

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COSPAS/SARSAT frequency management plan.

Directory: safety -> acp -> acpwgf -> acp-wg-f-12
acpwgf -> Joint meeting of the
acpwgf -> Working paper
acpwgf -> Amcp wgm/WP19 19 August 2002 Aeronautical Mobile Communication Panel (amcp) Working Group-m meeting Fifth Meeting Saint Petersburg, Russia, 19 to 23 August 2002 Agenda Item 4: satcom
acpwgf -> Acp wgf/16 wp 27 Rev. 1 International Civil Aviation Organization
acpwgf -> Working paper
acpwgf -> Working paper
acpwgf -> Airborne collision avoidance systems working group-a
acpwgf -> Working paper
acp-wg-f-12 -> Acp working group f 12th meeting

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