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ANNEX 10 . VOLUME V . AERONAUTICAL RADIO FREQUENCY SPECTRUM UTILIZATION 
Chapter 2  Distress frequencies 
2.1.2  Emergency locator transmitters (ELT) installed on or after 1 January 2002 do not have to operate on both 406 MHz and 121.5 MHz in the US. 
2.1.3  Effective date of 1 January 2005 for emergency locator transmitters to operate on both 406 MHz and 121.5 MHz was not met in the US. 
Chapter 4  Utilization of frequencies above 30 MHz 
4.1.1.1  The 121.5 MHz aeronautical emergency channel guard.band is reduced to 25 kHz. In the U.S. this 121.5 MHz channel is protected on either side by a single 25 kHz channel centered on frequencies 121.475 MHz and 121.525 MHz. The other four (4) guard band channels, centered on frequencies 121.425 MHz, 121.450MHz, 121.550MHz, and 121.575MHz are utilized to transmit weather information on simplex operations (ground.to.air only) using 25kHz channels. The maximum transmit power of the ground.based equipment is limited to 2.5 W. The ground.based equipment must also meet specific output spectral masks (defined as ± 25 kHz .33 dBm . 33 dBm; ± 50 kHz .45 dBm . 45 dBm; ± 75 kHz .47 dBm) 
4.1.2.1  The minimum frequency separation of 8.33 KHz has not been adopted in the US. 
4.1.2.2.1  Mandatory carriage of 8.33 KHz equipment has not been established in the US. 
4.1.2.2.2  8.33 KHz radios are not safeguarded with respect to its suitability for AM(R)S in the US 
4.1.2.2.3  FAA has not issued a mandatory carriage of VDL Mode 3 and VDL Mode 4. 
4.1.2.2.3.1  FAA has not issued a mandatory carriage of VDL Mode 3. 
4.1.2.2.4  No provision to safeguard VDL Mode 3 and Mode 4 with respect to its suitability for AM(R)S currently exists in the US. 
4.1.3.1.6  The US does not require aircraft flying within the US airspace to meet one of the characteristics dealing with the FM interference immunity performance. 
4.1.3.2.1  The frequency 123.45 MHz is not designated for air.to.air communications in the US airspace. 
4.1.3.2.2  The frequency 123.45 MHz is not designated for air.to.air communications in remote and oceanic areas within the US airspace. 
4.1.4.2  The US does not require aircraft flying within the US airspace to meet one of the characteristics dealing with the FM interference immunity performance. 
4.2.3  The US does not follow the VOR assignment priority as defined in Section 4.2.3. 

ANNEX 11 . AIR TRAFFIC SERVICES 
Chapter 1  Definitions 
Accepting Un-it  The term ”receiving facility” is used. 
Advisory Airspace  Advisory service is provided in terminal radar service areas and the outer area associated with class C airspace areas as well as Class E airspace. 
Advisory Route  Advisory service is provided in terminal radar service areas and the outer area associated with class C airspace areas as well as Class E airspace. 
ACAS  Traffic Alert and Collision Avoidance System (TCAS) – An airborne collision avoidance system based on radar beacon signals which operates independent of ground.based equipment. 14 CFR 1.1 further defines and breaks down TCAS into TCAS 1 – provides traffic advisories 2 – provides traffic advisories and resolution advisories in the vertical plane and 3 – provides traffic advisories and resolution advisories in the vertical and horizontal planes. 
AIRMET  FAA Pilot Controller Glossary defines (in part) AIRMET as ”In.flight weather advisories issued only to amend the area forecast concerning weather phenomena which are of operational interest to all aircraft and potentially hazardous to aircraft having limited capability because of lack of equip-ment instrumentation or pilot qualifications....” The ICAO definition of AIRMET narrows the purpose of the advisory to ”low.level aircraft operations”, where the FAA has a more broad defini-tion to encompass ”all aircraft and ... aircraft having limited capability...”  Also, ICAO uses the term ”forecast ... for the flight information region” where the FAA uses ”area forecast”.  Differ-ence in character (terminology) for area forecast. FAA uses AIRMETS for broader purpose. 
Air traffic con-trol unit  The U.S. uses the term “air traffic control facility”. (i.e. En Route, Terminal, or Flight Service) 
Air traffic ser-vices reporting office  FAA Pilot Control Glossary defines (in part) Flight Service Stations (FSS) as ”air traffic facilities which provide pilot briefing, en route communications and VFR search and rescue services, assist lost aircraft in emergency situations, relay ATC clearances, originate notices to airmen, broadcast aviation weather and NAS information, receive and process IFR flight plans....” FSS’s are avail-able to receive any reports concerning air traffic services as well as accept and file flight plans. 
　
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