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5.2.1.6 5.2.1.6.2.1.1 5.2.1.6.2.2.1 U.S. procedures allow abbreviation of only Type a) call signs and limit abbreviation to not less than three characters following the first character of the registration marking or the manufacturer of the aircraft. Also, the U.S. does not use call signs comprised of aircraft operating agency telephony designators in combination with aircraft registration markings (Type b).
Remarks To facilitate understanding, examples (5.2.1.6) should follow rather than precede corresponding provisions which govern them (5.2.1.6.2.1.1 and 5.2.1.6.2.2.1).
5.2.2.1.1.1 5.2.2.1.1.2 The U.S. Federal Aviation Regulations do not require that a continuous airborne guard on VHF121.5 MHz be maintained.
5.2.2.7.1.2 US regulations do not specifically require pilots to send a message twice preceded with the phrase “TRANSMITTING BLIND”. US regulations provides general procedures which allow pilots to make blind transmissions in case of emergency.
5.2.2.7.1.3.2 US regulations do not specifically require pilots to make a blind transmission preceded by “TRANSMITTING BLIND DUE TO RECEIVER FAILURE” with respect to the continuation of the flight of the aircraft. US regulations provide general procedures which allow pilots to make appropriate blind transmissions.
5.2.2.7.2.1, 5.2.2.7.2.2 US regulations do not specifically require aeronautical stations to get assistance from other aircraft in case of communications failure. US regulations require aeronautical stations to use ”all appropriate means” available to re.establish communications with aircraft.
5.2.2.7.2.3 US regulations do not specifically require aeronautical stations to send blind transmissions. US regulations require aeronautical stations to use ”all appropriate means” available to re.establish communications with aircraft.
5.2.2.7.2.4 US regulations do not provide this specific standard. US regulations require aeronautical stations to use ”all appropriate means” available to re.establish communications with aircraft.
5.2.2.7.3.1 US regulations do not specifically require pilots to make a blind transmission preceded by ”TRANSMITTING BLIND DUE TO RECEIVER FAILURE”. US regulations provide general procedures which allow pilots to make appropriate blind transmissions.
ANNEX 10 . VOLUME III . COMMUNICATION SYSTEMS
PART I . DIGITAL DATA COMMUNICATION SYSTEMS
Chapter 1 Definitions
ATN Directory Services The FAA has not implemented the DIR as part of the AMHS Extended Service. The Basic Service AMHS has been implemented.
ATN Security Services The ATN Security Service can be implemented as part of the AMHS Extended Service.
Authentication This is a part of ATN Security Services of the ATN DIR/AMHS Extended Service that has not been implemented.
Security Management This is a part of ATN Security Services capability of the ATN DIR/AMHS Extended Service that has not been implemented.
Chapter 3 Aeronautical Telecommunication Network
3.2.1 The Ground.to.Ground ATN service based on OSI has been implemented (AMHS) but not Air.to.Ground.
3.2.2 ATN Ground.to.Ground service does not support sections a) 4) APC, c), e), f) and g)
3.2.3 FAA ATN currently does not support these services.
3.3.1 FAA ATN service does not support a) ATS to aircraft and c) AOC.
3.4.1.4, 3.4.16, 3.4.19, 3.4.32 The FAA ATN only supports AMHS (ground service).
Chapter 4
4.2.1.2 4.2.1.3 In the U.S., AMSS terminals shall have the capability of operating in the frequency bands 1544.1559 MHz and 1645.5.1660.5 MHz bands. (NOTE: Use of the band 1544.1545/1645.5.1646.5 MHz by the mobile satellite service is limited to distress and safety.)
PART II
2.3.3.1 2.3.3.2 2.3.3.3 The U.S. does not require such equipage for aircraft.
ANNEX 10 . VOLUME IV . SURVEILLANCE AND COLLISION AVOIDANCE SYSTEMS
Chapter 3 Surveillance Systems
3.1.1.7.13 SPI required to be transmitted for 18 +/. 1 second. US regulations are more stringent than ICAO.
3.1.2.6.5.2 In the request to downlink, Annex 10 assigns bits 0 to 7, many of them are reserved. The FAA Order 6365.1A implements this requirement assigning bits 0 and 1 and the bits 2 through 15 are not assigned.
3.1.2.10.4.3.3 Annex 10 requires ”If antenna selection is based on signal level, it shall be carried out at all signal levels between MTL and .21 dBm.” The RTCA MOPS for Mode S transponders, DO.181c, does not specify the range of signal levels over which the antenna selection must correctly be accomplished. FAA Order 6365.1A paragraph 5.5.1 addresses the issue of antenna selection. However, the TSO standard conferred upon manufacturers does not require implementation.
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