8.1.1 The
requirements for Ice Class 1AS FS, Ice Class 1A FS, Ice Class
1B FS and Ice Class 1C FS, as applicable, are
to be applied using the installed engine power as given by Pt 8, Ch 2, 9 Machinery requirements for first-year ice conditions - Ice classes 1AS FS(+), IAS FS, 1A FS(+), 1A FS, 1B
FS(+), 1B FS, 1C FS(+) and 1C FS.