Reg. 13 of MARPOL Annex VI, concerning Nitrogen Oxide (NOx), requires that a record book of engine parameters is to be maintained onboard. All changes relative to engine components and settings are to be recorded in the record book as required in accordance with 6.2.3.2 and 6.2.3.3 of the NOx Technical Code. All adjustments, part replacements and modifications that affect NOx emissions are to be described in the record book chronologically.

Further, it is clearly stated in 6.2.2.7 of NOx Technical Code 2008 which shall enter into force on 1 July 2010, that all part replacements, including 'like-for-like' replacements, are to be described in the record book. As this is in line with ClassNK's previous interpretation of the code, no specific changes to handling such modifications or replacements are necessary. However, ClassNK would like to simply remind owners and management companies that whenever adjustments, part replacements (including 'like-for-like' replacements), or modifications affecting NOx emissions are carried out, those changes are to be described in the record book.

Additionally, although the NOx Technical File is required to be maintained onboard, there have been numerous reports of cases where the NOx Technical File has not been maintained onboard. Therefore, please keep in mind that the NOx Technical File, as well as the record book of engine parameters, is to be maintained onboard along with EIAPP Certificate.


For any questions about the above, please contact:

NIPPON KAIJI KYOKAI (ClassNK)
Machinery Department, Administration Center, Head Office
Address: 4-7 Kioi-cho, Chiyoda-ku, Tokyo 102-8567, Japan
Tel.: +81-3-5226-2022 / 2023
Fax: +81-3-5226-2024
E-mail: mcd@classnk.or.jp