Home' RTCA Documents for Review : DO-343B Contents 2
© RTCA, 2018
This document is organised as follows.
The main body of the document follows the RTCA/EUROCAE guidelines for MASPS
preparation. After this initial introductory section, Section 2 contains the system
requirements at the CSP level. Most of these requirements are presented in tabular
form to simplify the cross-reference matrices required in the system-specific material.
Section 3 is retained to maintain compliance with the MASPS drafting guidelines.
Section 3 content is minimal, however, because partitioning below the CSP level, if any,
will be on a system-specific basis, and will be covered in the system-specific material.
The RCP/RSP concept is applied at the CSP level. Section 4 contains suggested
verification methods for the CSP level requirements defined in Section 2.
This document adds a Section 5 to the standard MASPS outline. Section 5 contains
guidance for the preparation of system-specific attachments to this document.
System-specific material as defined in Section 5 will be provided as attachments to this
document. Each system-specific attachment will describe the system that provides
AMS(R)S, and will contain information detailing system compliance with the
requirements in the main body of this document and verification plans. Each system-
specific attachment is expected to function as a stand-alone MASPS for that system. 1
Each system-specific attachment may include its own appendices, as necessary for the
description and declaration of the system performance. Suggested appendices are
identified in Section 5.
AMS(R)S SYSTEM OVERVIEW
The boundary of the AMS(R)S system described in this document is shown in
FIGURE 1-1. On the ground side, the AMS(R)S system receives inputs from and
provides outputs to the Air Navigation Service Provider (ANSP). On the air side, the
AMS(R)S system receives baseband inputs from and provides baseband outputs to the
User Avionics, which typically consists of Communication Management Units (CMUs)
and the Audio Management System (AMS). Networking within the aircraft and
networking within the ANSP ground network is not included in the AMS(R)S system.
CSP networking from the ANSP interface to the appropriate satellite service provider
interface, satellite service provider networking, satellite ground facilities, satellites, and
satellite system avionics 2 are included within the AMS(R)S system.
The AMS(R)S system should support CPDLC and ADS data communications and voice
communications, as well as such additional data services as may be declared, specified,
and verified in the system-specific material. This requirement is at the CSP level: there
is no intent that every aircraft be equipped to support every service. Aircraft equipage
standards will be determined by national certifying authorities.
This document recognises that the AMS(R)S system denoted in FIGURE 1-1 is itself a
"system of systems". Therefore, the AMS(R)S system will be partitioned into lower level
networks and systems. A notional view of such partitioning is shown in FIGURE 1-2.
The CSP is partitioned in to the Communications Network Provider (CNP) and the
Satellite Service Provider (SSP). The actual partitioning underlying any specific CSP
performance will be dependent on the specifics of the CNP, SSP, and technology used
for the satellite constellation and network. Such details are intended for disclosure in
the system-specific material described in Section CHAPTER 5, below.
1 Without such a system-level description, including a description of the various services provided, there
will be no basis for establishing the technical requirements on the Aeronautical Earth Station (AES)
described in the equivalent system-specific material in DO-262/ED-243 or successor documents.
2 Usual practice within the community refers to the satcom-specific avionics, including antennas, as the
Aeronautical Earth Station or AES.
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