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 SC225 New
UI SC225 The occupied volume by flooded water of a flooded space in the SOLAS Chapter II-1 (Regulation 2(14)) - September 2008
UI SC226 Rev1 CLN
UI SC227 Rev2 CLN
UI SC228 New
UI SC228 Machinery shutoff arrangements - Oil mist detector arrangements SOLAS Regulation II-1/27.5: Machinery – Automatic shutoff arrangements - December 2008
UI SC232 New
UI SC232 Steam Boilers and Boiler Feed Systems SOLAS Reg. II-1/32.4 - May 2009
UI SC233 Rev1 CLN
UI SC234 Deleted
UI SC235 Corr2 CLN
UI SC239 New
UI SC239 Insulation with approved non-combustible materials (Reg. II-2/3.2.3) - June 2009
UI SC240 Corr1 CLN
UI SC241 New
UI SC241 Manually operated call points (SOLAS II-2/7.7) - November 2010
UI SC242 Corr 1 Reinstated CLN
UI SC242 Arrangements for steering capability and function on ships fitted with propulsion and steering systems other than traditional arrangements for a ship’s directional control (Chapter II-1, Regulations 29.1, 29.2.1, 29.3, 29.4, 29.6.1, 29.14, 28.3 and 30.2) - Corri1 Aug 2011 Reinstated Clean
UI SC243 Rev1 CLN
UI SC244 Rev1 Corr1 CLN
UI SC245 Corr1 CLN
UI SC246 Rev1 CLN
UI SC247 New
UI SC247 Emergency exit hatches to open deck (SOLAS Reg. II-2/13.1) - September 2011
UI SC248 Rev1 CLN
UI SC249 Rev1 CLN