Effective scheduled date applicable to amended ClassNK Rules and Guidance related to tests of diesel engines Tec No.:TEC- 1066 (268kb) Contact:Machinery Department Issued:11 Apr 2016 IACS has adopted Unified Requirements M51(Rev.4), M71, M72(Corr.1), M73 and Z26 related to tests of diesel engines. Accordingly, relevant ClassNK Rules and Guidance are being amended based upon these Unified Requirements. Please note that the effective scheduled date of the amended Rules and Guidance is as follows: 1. The amended Rules and Guidance will be applied to engines whose applications for approval are submitted to ClassNK on or after 1 July 2016. 2. Requirements related to shipboard trials of diesel engines (IACS UR M51.4), however, only apply to the following engines: i) engines whose applications for approval are submitted to ClassNK on or after 1 July 2016; or ii) engines installed on new ships whose contracts for construction are dated on