TechnicalNoticeon“UnifiedInterpretationofSOLASRegulationXI-1.7”(MSC.1-Circ.1561)IssuedbyIMO

CCSTechnical Information(2017)Technical Information No.56 Total No.304Jul.31,2017(Total 2 pages)To:relevant departments of the Headquarters of CCS,CCS'surveyors,plan approval centers,relevant ship owners,shipyards and designersTechnical Notice on "Unified Interpretation of SOLAS RegulationXI-1.7"(MSC.1-Circ.1561)Issued by IMO1.Preface1.The Maritime Safety Committee of the International Maritime Organization,at itsninety-seventh session,adopted "Unified Interpretation of SOLAS Regulation Xl-1/7(MSC.1/Circ.1561)"on 21 November 2016.This circular applies to all passenger shipsand cargo ships of 500 gross tonnage and above from the date of issuance (28November 2016).Il.Main technical points2.1 Main contents of MSC.1/Circ.1561Clarifying "suitable means shall be provided for the calibration of all suchinstruments"in SOLAS Regulation Xl-1/7.It may be achieved by portable atmospheretesting instruments being calibrated on board or ashore in accordance with themanufacturer's instructions.Meanwhile it makes clear that the above clarificationrefers to the calibration of portable atmosphere testing instruments,as required bySOLAS regulation Xl-1/7,and not to any pre-operational accuracy tests asrecommended by the manufacturer.Annex Unified Interpretation of SOLAS Regulation XI-1/7 (MSC.1/Circ.1561)(both in