Unified Interpretations are adopted resolutions on matters arising from implementing the requirements of IMO Conventions or Recommendations. Such adopted resolutions can involve uniform interpretations of Convention Regulations or IMO Resolutions on those matters which in the Convention are left to the satisfaction of the Administration or vaguely worded.
Interpretations are circulated to Administrations concerned or are sent to IMO for information, as appropriate.
- IACS, as an international Non-Governmental Organization having observer status at IMO, works in co-operation with IMO in order to endeavour that regulations developed at IMO are clear, unambiguous and can easily be applied without the need of interpretations.
- However, interpretations may still be needed in cases where IMO regulations contain only functional requirements, allow alternative solutions to prescriptive requirements, are left to the satisfaction of Administrations or are generally or vaguely worded.
- The following Unified Interpretations (UIs) have been developed by IACS to assist the unified implementation of IMO regulations falling in the above-mentioned cases. It should be noted that the development of IACS Unified Interpretations (UIs) is not aiming at introducing additional requirements but at achieving uniform application of IMO regulations.
- IACS UIs are to be applied by IACS Societies to ships whose flag Administrations have not issued definite instructions on the interpretation of the IMO regulations concerned, in the course of statutory certification on behalf of those flag Administrations.
The technical backgrounds (development histories) of Unified Interpretations since 2004 can be found by following this link.
A list of the IACS working groups responsible for each Unified Interpretation may be found here.
UI SC271 New
UI SC271 Additional indicating unit in the cargo control room in accordance with amended FSS Code Chapter 18.104.22.168.3 - January 2015
UI SC272 Rev1 CLN
UI SC273 Rev1 CLN
UI SC274 New
UI SC274 Hazardous area classification in respect of selection of electrical equipment, cables and wiring and positioning of openings and air intakes - December 2015
UI SC275 Rev1 CLN
UI SC276 New
UI SC276 Escape from machinery spaces on passenger ships SOLAS Chapter II-2, Regulation 13.4.1 - January 2016
UI SC277 New
UI SC277 Escape from machinery spaces on cargo ships SOLAS Chapter II-2, Regulation 13.4.2 - January 2016
UI SC278 New
UI SC278 Escape from accommodation spaces, service spaces and control stations on cargo ships SOLAS Chapter II-2, Regulation 22.214.171.124 and 126.96.36.199 - January 2016
UI SC279 New
UI SC279 Annual testing of VDR, S-VDR, AIS and EPIRB
- SOLAS regulation V/18.8 - Annual performance test of Voyage Data Recorder (VDR) and Simplified Voyage Data Recorder (S-VDR)
- SOLAS regulation V/18.9 - Annual performance test of Automatic Identification System (AIS)
- SOLAS regulation IV/15.9 - Annual test of EPIRB
UI SC280 New
UI SC280 Angle of down-flooding (ϕf) / Angle at which an opening incapable of being closed weathertight (θv) (2008 IS Code, International Grain Code, SOLAS/Ch.II-1-Reg.7-2) - June 2016
UI SC281 Del
UI SC282 New
UI SC282 Application of materials other than steel on engine, turbine and gearbox installations - Dec 2016
UI TM1 New
UI TM1 Determination of Moulded Depth (D) for Ships with an Open Mooring Deck Aft or Stepped Upper Deck - 1993
UI TM2 New
UI TM2 International Tonnage Convention 1969 - Heat Exchangers (Coolers) Treatment - October 2015
UI TM3 Deleted
UI TM3 Interpretation of International Tonnage Calculation: Open Deck Spaces Bounded by Partitions or Bulkheads (ITC69 regulation 2(4), 2(5) and 6) Withdrawn April 2016.