Section 7 Requirements for craft which are not required to comply with the HSC Code

7.1 Details to be submitted

7.1.1 Failure mode effect analysis is not required for craft which do not require to comply with the HSC Code.

7.1.2 Mass elastic schematic showing gear unit torsional data is only required for gears with an input power greater than 500kW, see Pt 11, Ch 1, 2.2 Plans 2.2.2 and Pt 13 Shaft Vibration and Alignment.

7.2 Design of gearing

7.2.1 Where they are not intended for passenger carrying duties, the gearing factors of safety for yachts, service craft less than 24 m and ACVs are to satisfy Table 1.7.1 Factors of safety.

Table 1.7.1 Factors of safety

	S _H min	S _F min
Main propulsion gears for yachts, etc. single screw	1,25	1,50
Main propulsion gears for yachts, etc. multiple screw	1,20	1,45

7.3 Piping systems

7.3.1 For service craft less than 24 m and for yachts the requirements of Pt 11, Ch 1, 5.2 Pumps 5.2.1 and Pt 11, Ch 1, 5.3 Filters 5.3.1 do not apply. These craft are to have gearing provided with an efficient lubricating oil pump, a cooler where necessary, and a filter arrangement which can be cleaned.

7.4 Control and monitoring

7.4.1 For service craft less than 24 m the alarms required by Pt 11, Ch 1, 6.2 Unattended machinery 6.2.1 are not required.