4 Effects of failures or malfunction
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - International Codes - HSC 2000 Code - International Code of Safety for High-Speed Craft, 2000 – Resolution MSC.97(73) - Annex 9 - Definitions, requirements and compliance criteria related to operational and safety performance - 4 Effects of failures or malfunction

4 Effects of failures or malfunction

  4.1 General

The limits of safe operation, special handling procedures and any operational restrictions shall be examined and developed as a result of full-scale trials conducted by simulating possible equipment failures.

The failures to be examined shall be those leading to major or more severe effects as determined from evaluation of FMEA or similar analysis.

Failures to be examined shall be agreed between the craft manufacturer and the Administration and each single failure shall be examined in a progressive manner.

  4.2 Objects of tests

Examination of each failure shall result in:

  • .1 determining safe limits of craft operation at the time of failure, beyond which the failure will result in degradation beyond safety level 2;

  • .2 determining crew member's actions, if any, to minimize or counter the effect of the failure; and

  • .3 determining craft or machinery restrictions to be observed to enable the craft to proceed to a place of refuge with the failure present.

  4.3 Failures to be examined

Equipment failures shall include, but not be limited to, the following:

  • .1 total loss of propulsion power;

  • .2 total loss of lift power (for ACV and SES);

  • .3 total failure of control of one propulsion system;

  • .4 involuntary application of full propulsion thrust (positive or negative) on one system;

  • .5 failure of control of one directional control system;

  • .6 involuntary full deflection of one directional control system;

  • .7 failure of control of trim control system;

  • .8 involuntary full deflection of one trim control system element; and

  • .9 total loss of electrical power.

Failures shall be fully representative of service conditions and shall be simulated as accurately as possible in the most critical craft manoeuvre where the failure will have maximum impact.

  4.4 "Dead ship" test

In order to establish craft motions and direction of laying to wind and waves, for the purposes of determining the conditions of a craft evacuation, the craft shall be stopped and all main machinery shut down for sufficient time that the craft's heading relative to wind and waves has stabilized. This test shall be carried out on an opportunity basis to establish patterns of the design's "dead ship" behaviour under a variety of wind and sea states.

Parent topic: Annex 9 - Definitions, requirements and compliance criteria related to operational and safety performance
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