Recommenda-tion 6.14 U.S. regulations do not require that flight crew members communicate through boom or throat microphones below the transition level/altitude.
Chapter 7 Aeroplane Communication and Navigation Equipment
7.1.1 All airplanes operated at night are not required to have radio communications equipment capable of conducting two.way communications with aeronautical stations.
7.1.2 When more than one radio communications equipment unit is required, it is not required that each unit be independent of the other or others.
7.1.4 Except when operating under instrument flight rules, airplanes operated on extended flights over water or on flights over underdeveloped land are not required to have radio communications equipment capable of conducting two.way communications at any time during flight with aeronautical stations.
7.1.5 The U.S. does not base its requirement for radio communications equipment in general aviation aircraft on the criteria included in ICAO Annex 6, Part II (Chapters 6 and 7); for example, all night operations, operations over land areas in which search and rescue would be especially difficult, etc. Instead, U.S. requirements for such equipment is based upon the type of airspace with which the aircraft is to be involved; that is, use of controlled airspace such as terminal control areas (Class B Airspace), airport radar service areas, and positive control areas (Class A Airspace). Thus, U.S. requirements do not depend on such ICAO factors as time of day of the operation or the nature of the land over which the operation is to be conducted. Where such equipment is required by U.S. regulations, the aeronautical emergency frequency of 121.5 MHz is automatically available to all such radio.equipped aircraft since the VHF communications frequency range encompasses the emergency frequency of 121.5 MHz.
7.2.4 An airplane is not required to be provided with navigation equipment to ensure that, in the event of the failure of one item of equipment at any stage of the flight, the remaining equipment will enable the airplane to proceed in accordance with 7.2.1.
Chapter 8 Aeroplane Maintenance
8.3.2 The U.S. does not require records to be maintained after the end of the operating life of the unit.
PART III
SECTION I
General The U.S. does not accept any provision of Annexes 2, 6, 10, or 11 or any other Annex as a Standard or Recommended Practice as applicable to State aircraft. In accordance with Article 3(a) of the Convention of International Civil Aviation, the Convention and its Annexes are not applicable to State aircraft. In so far as any provisions of Annexes 2, 6, 10, or 11 address the operation or control of State aircraft, the U.S. considers such provisions to be in the nature of a special recommendation of the Council, advisory only, and not requiring the filing of differences under Article 38 of the Convention.
Chapter 1 Definitions
Minimum descent altitude (MDA) or minimum descent height (MDH) The U.S. does not use MDH (or height above airport) as an altitude or height in a non.precision approach or circling approach below which descent must not be made without the required visual reference.
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