(5)
 developing recommendations resulting from tins study. Seven candidate future systems alternatives were evaluated against future system requirements and desirable features and as a result of this study, six recommendations to pursue present and future system improvements were adopted.

RTCA DO-226
RTCA Document 226, Guidance Material for Evolving Airborne Precision Area Navigation Equipment with Emphasis on MLS, Issued 5/95. This document spans a decade of work by two RTCA Special Committees (151/171). During this period, alternative technologies to the Microwave Landing System (e.g., satellite navigation) have evolved. Yet the need for precision, near-airport area navigation continues. Whatever the navigation source for an operational capability, much of the material in this document is germane to any precision, terminal-area navigation system. The philosophy used in preparing the document was to provide guidance for any terminal area navigation system although the specific performance requirements and test procedures assume the MLS Random (Area) Navigation (RNAV) sensor inputs.
RTCA SC-142
RTCA Special Committee 142, Air Traffic Control Radar Beacon System/Mode Select
(ATCRBS/MODE S) Airborne Equipment.

RTCA SC-147
RTCA Special Committee 147, Traffic Alert and Collision Avoidance System (TCAS) Airborne Equipment.
RTCA SC-159
RTCA Special Committee 159, Minimum Aviation System Performance Standards For Airborne Navigation Equipment Using The Global Positioning System (GPS).
RTCA SC-162
RTCA Special Committee 162, Aviation Systems Design Guidelines For Open Systems;
Interconnect (OSI).

RTCA SC-163
RTCA Special Committee 163, Unintentional of Simultaneous Transmissions That Adversely Affect Two-Way Radio Communications.
RTCA SC-165
RTCA Special Committee 165, Minimum Operational Performance Standards For Aeronautical Mobile Satellite Services.
RTCA SC-166
RTCA Special Committee 166, User Requirements For Future Airport And Terminal Area
Communications, Navigation And Surveillance Systems.

RTCA SC-167
RTCA Special Committee 167, Digital Avionics Software.
RTCA SC-169
RTCA Special Committee 169, Aeronautical Data Link Applications.

 
RTCA SC-170 RTCA Special committee 170, Minimum Operational Performance Standards For Automatic Dependent Surveillance (ADS). RTCA SC-171 RTCA Special Committee 171, Airborne MLS Area 8 Navigation Equipment. RTCA SC-172 RTCA Special Committee 172, Future Communications Air-Ground Improvements In The VHF Aeronautical Band (118-137 MHz). RTCA SC-173 RTCA Special Committee 173, Airborne Weather And Ground Pulsed Radars. RTCA SC-175 RTCA Special Committee 175, Minimum General Specification For Ground Based Electronic Equipment In The National Airspace System. RTCA SC-176 RTCA Special Committee 176, Operation and Use Of LORAN-C As A Sole Means Of Air Navigation. RTCA TF-1 RTCA Task Force 1. Task Force Report On The Global Navigation Satellite System (GNSS) Transition And Implementation Strategy, Lined 09/92. The RTCA Task Force Report on Global Navigation Satellite System (GNSS) Transition and Strategy concludes that : the entire user community is enthusiastic about the operational benefits to be derived from the use of GNSS, basic satellite navigation technology needed to achieve an early GNSS operational capability is available, there are no institutional issues that should preclude early implementation, the transition to operational use should begin almost immediately, should be user driven and should occur in an evolutionary manner, and additional action should begin now to expand on initial operational capabilities. RTCA TF-2 RTCA Task Force Report on the Transition to Digital Communications. The Transition to Digital Communications Task Force Report concludes that the aviation community urgently needs the economic benefits which can flow from the use of digital communications. Technology is available. Broad-based implementation of digital communications will hinge on international co-operation, a close and effective government partnership devoted to fielding new equipment plus a priori assurances from government that aircraft operators will obtain a prompt and significant return on their investment in new technology. RTCA-DO-224A Signal-in-Space Minimum System Performance Standards (MASPS) for Advanced VHF Digital Data Communications including Compatibility with Digital Voice Techniques. RTCA-DO-270 Minimum Aviation System Performance Standards (MASPS) for the Aeronautical Mobile-Satellite . Service (AMS.)S as Used in Aeronautical Data Links. RTCA-DO-271 Minimum Operational Performance Standards (MOPS) for Aircraft VDL Mode 3 Transceiver Operating in the Frequency Range 117.975-137.000 MHz. RTCA-DO-272 User Requirements for Aerodrome Mapping Information. RTCA-DO-273 Response to the Report of the RTCA Chairman’s Committee on NEXCOM.