Home' RTCA Documents for Review : DO-204B, MOPS Aircraft ELT 406MHZ Contents © EUROCAE, 2018
1.1 PURPOSE AND SCOPE
This document contains minimum operational performance specifications for
Emergency Locator Transmitters, (ELT), to ensure that they will:
meet the activation specifications,
meet environmental test conditions,
meet Cospas-Sarsat system requirements for satellite processing of a distress
signal (primary alert),
be compatible with homing devices used for Search And Rescue (SAR),
not adversely affect aircraft operations,
not be adversely affected by the aircraft operations.
Chapter 1 of this document provides information needed to understand the rationale
for the equipment characteristics and requirements stated in the remaining chapters. It
describes typical equipment operation and goals, as envisioned by the members of
EUROCAE Working Group 98 and RTCA Special Committee 229. Chapter 1 also
establishes the basis for the standards stated in chapter 2. Definitions, a list of related
documents and assumptions essential to proper understanding of this document are
also provided in this chapter.
Chapter 2 contains the general Minimum Operational Performance Standards,
(MOPS), General Design Specifications for the ELT system.
Chapter 3 describes ELT minimum performance specifications under standard
Chapter 4 provides minimum performance specifications under environmental test
Chapter 5 describes recommended bench level test procedures necessary to
demonstrate the ELT system will meet the requirements stated in chapters 2 - 4.
Chapter 6 provides installed equipment performance as well as technical guidance
equipment manufacturers can follow to write comprehensive installation manuals that
contain best practices for automatic fixed, automatic portable, deployable, survival,
and distress tracking ELTs.
Chapter 7 provides instructions to the ELT manufacturer on items that should be
specified in documentation supplied to the customer to ensure ELT system continues
to meet the performance standards throughout the life of the ELT system
Appendix A provides a comprehensive list of documents related to ELT systems to be
included in the manufacture installation manuals.
1.2 COSPAS-SARSAT SYSTEM OVERVIEW
The International Cospas-Sarsat Program is a treaty-based, nonprofit,
intergovernmental humanitarian cooperative of more than 40 nations and agencies
dedicated to detecting and locating 406 MHz radio beacons activated from aircraft,
vessels and by persons (e.g., backcountry hikers) in distress, and forwarding this alert
information to SAR authorities that can take action for rescues. The system utilizes a
network of satellites that provide coverage anywhere on Earth. Distress alerts are
detected, located and forwarded to over 200 countries and territories at no cost to the
receiving government agencies. Cospas-Sarsat was conceived and initiated by the
founding Party States of Canada, France, the United States, and the former Soviet
Union in 1979. (The Russian Federation succeeded the Soviet Union as a Party to the
406 MHz distress beacons capable of being detected by the Cospas-Sarsat System,
ELTs for aviation use, Emergency Position Indicating Radio Beacons (EPIRBs) for
maritime use and Personal Locator Beacons (PLBs) for individuals are available from
several manufacturers and vendor chains.
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