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 MPC84 Deleted
UI MPC84 Annex VI of MARPOL 73/78 Regulation 16 (9) Deleted Nov 2013
UI MPC85 Rev4 CLN
UI MPC85 Regulation 22(5), Annex I of MARPOL 73/78 as amended by resolution MEPC.117(52) Regulation 22, Pump-room bottom protection - Rev.4 September 2008
UI MPC86 Corr1 CLN
UI MPC86 Annex IV of MARPOL 73/78 Regulation 10.1 as amended by Resolution MEPC.115(51) Standard Discharge Connection - Corr.1 October 2007
UI MPC87 New
UI MPC87 Annex I of MARPOL 73/78 Regulation 12A as amended by Resolution MEPC.141(54) Regulation 12A.9, as amended by Resolution MEPC.141(54) - January 2007
UI MPC88 Rev1 CLN
UI MPC90 New
UI MPC90 Annex I of MARPOL 73/78 Regulation 1 as amended by Resolution MEPC.117(52) Regulation 1.28.1 to 1.28.8, as amended by Resolution MEPC.117(52) - September 2007
UI MPC91 New
UI MPC92 New
UI MPC92 Tonnage to be used when applying MARPOL Annex VI Regulation 5 Surveys and Inspections - October 2007
UI MPC93 Rev1 CLN
UI MPC94 New
UI MPC94 Annex I of MARPOL 73/78 Regulation 12A.6-8 and 11.8 Oil Fuel Tank Protection, as amended by Resolution MEPC.141(54) Regulation 12A.6-8 and 11.8 as Amended by Resolution MEPC.141(54) - July 2008
UI MPC95 New
UI MPC95 Measurement of Distances - August 2008
UI MPC96 Deleted
UI MPC97 New
UI MPC97 Volatile Organic Compounds (VOCs) Management Plan MARPOL VI, Regulation 15.6 and 15.7 - July 2010
UI MPC98 New
UI MPC98 “Time of the Replacement or Addition” for the Applicable Tier Standard For the Supplement to the IAPP Certificate - January 2012
UI MPC99 New
UI MPC99 Oil residue (sludge) tank discharge connections to the bilge system, oily bilge water holding tank(s), tank top or oily water separators (MARPOL 73/78 Annex I Regulation 12.2) MARPOL 73/78 Annex I (as amended by MEPC.187(59)) Regulation 12.2 - July 2011
UI MPC100 New
UI MPC100 Date of Delivery under SOLAS and MARPOL Conventions - June 2012
UI MPC101 New
UI MPC101 Supplement to the International Air Pollution Prevention (IAPP) Certificate – Section 2.3 - July 2012
UI MPC102 New
UI MPC102 Surveys and certification relating to the Ship Energy Efficiency Management Plan (SEEMP) (MARPOL Annex VI Regulation 5.4.4) - July 2012
UI MPC103 New
UI MPC103 - Identical Replacement Engines (MARPOL Annex VI Regulation 13) - January 2013