U.S.
 National Aviation Standard for the VHF A/G Communications System.

RTCA DO-164A
RTCA Document 164A, Minimum Performance Standards - Airborne Omega Receiving Equipment, Issued 9/79. This document recommends standards and test procedures for airborne Omega Navigation Receivers, Systems Sensors and Navigation Systems. Also included are operational characteristics. Appendices include conditions for testing, detailed test procedures and a description of Omega Error Mechanisms.
RTCA DO-165
RTCA Document 165, Initial Report on Civil Aviation Frequency Spectrum Requirements - 1980 - 2000, Issued 05/76. This document provides a comprehensive report on civil aviation's frequency requirements. Appendices recommend revisions to the ITU Table of Allocations and the footnotes thereto. Provides justification for stated operational requirements; provides an aviation forecast.
RTCA DO-171
RTCA Document 171, Recommendations on Policies and Procedures for Off-the-Shelf Electronic Test Equipment Acquisition and Support, Issued 01/80. This document provides rationale and recommendations for various conditions and procedures that could provide major benefits to those responsible for drafting legislation, policies, procedures and guidelines for the acquisition and support of electronic test equipment.
RTCA DO-173
RTCA Document 173, Minimum Operational Performance Standards for Airborne Weather and Ground Mapping Pulsed Radars, Issued 11/80 (TS0 C63c). This document postulates operational, goals and applications, and recommends standards and test procedures for airborne weather and ground mapping pulsed radars. It takes into account new radar technology and is applicable to both large aircraft and general aviation aircraft systems. Includes test conditions and procedures for installed equipment performance and operational characteristics with test procedures.