2 Duplication of Equipment for Ensuring Availability
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Resolutions - Assembly - IMO Resolution A.702(17) – Radio Maintenance Guidelines for the Global Maritime Distress and Safety System (GMDSS) Related to Sea Areas A3 and A4 – (Adopted on 6 November 1991) - Annex - Guidelines for Ensuring the Availability of Radio Equipment for Ships Engaged on Voyages in Sea Areas A3 and A4 required by Regulation IV/15.7 of the 1974 SOLAS Convention, as amended in 1988 - 2 Duplication of Equipment for Ensuring Availability

2 Duplication of Equipment for Ensuring Availability

  2.1 If availability is ensured by using a combination of methods which includes duplication of equipment, in addition to the radio installations required by Regulations IV/7, IV/10 and IV/11, as appropriate, the following radio installations complying with Regulation IV/14 should be available on board ships engaged on voyages in:

  • .1 sea area A3 - a VHF radio installation complying with the requirements of Regulation IV/7.1.1 and either an MF/HF radio installation complying with the requirements of Regulation IV/10.2.1 and being able to comply fully with the watch requirements of IV/12.1.3 or an INMARSAT SES complying with the requirements of Regulation IV/10.1.1. The MF/HF installation or INMARSAT SES installed for duplication should also comply with Regulation IV/10.3;

  • .2 sea areas A3 and A4 - a VHF radio installation complying with the requirements of Regulation IV/7.1.1 and an MF/HF radio installation complying with the requirements of Regulation IV/10.2.1 and being able to comply fully with the watch requirements of IV/12.1.3. Ships operating in sea area A4 only occasionally and having originally installed an MF/HF radio installation, may, instead of the additional MF/HF radio installation, install an INMARSAT SES complying with the requirements of Regulation IV/10.1.1. The MF/HF radio installation or INMARSAT SES installed for duplication should also comply with Regulation V/10.3.

  2.2 The additional radio installations specified in 2.1.1 and 2.1.2 of these Guidelines should each be connected to a separate antenna and be installed and ready for immediate operation.

  2.3 It should be possible to connect the additional radio installations specified in 2.1.1 and 2.1.2 (hereinafter referred to as “duplicated equipment”) to the reserve source or sources of energy required by Regulation IV/13.2, in addition to the appropriate radio equipment specified in that regulation (hereinafter referred to as “basic equipment”). The capacity of the reserve source or sources of energy should be sufficient to operate the particular installation (i.e. the “basic equipment” or the “duplicated equipment”) with the highest power consumption, for the appropriate period specified in Regulation IV/13.2.1 to IV/13.2.3. However, the arrangement for the reserve source or sources of energy should be such that a single fault in this arrangement should not be able to affect both the basic and the duplicated equipment.

Parent topic: Annex - Guidelines for Ensuring the Availability of Radio Equipment for Ships Engaged on Voyages in Sea Areas A3 and A4 required by Regulation IV/15.7 of the 1974 SOLAS Convention, as amended in 1988
Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.