Section 5 Control and monitoring

5.1.1 Control engineering systems are to be in accordance with the requirements of Pt 6, Ch 1 Control Engineering Systems.

5.2.1 Where controllable pitch propellers are fitted with automatic or remote controls so that under normal operating conditions they do not require any manual intervention by the operators, they are to be provided with the alarms and safety arrangements required by Pt 5, Ch 7, 5.2 Unattended machinery to Pt 5, Ch 7, 5.3 Controllable pitch propellers and transverse thrust units, as appropriate. Alternative arrangements which provide equivalent safeguards will be considered.

5.2.2 Where machinery specified in this Section is required to be provided with a standby pump, the standby pump is to start automatically if the discharge pressure from the working pumps falls below a predetermined value.

5.3.1 Alarms and safeguards are indicated in Pt 5, Ch 7, 5.3 Controllable pitch propellers and transverse thrust units 5.3.2 to Pt 5, Ch 7, 5.3 Controllable pitch propellers and transverse thrust units 5.3.5 and Table 7.5.1 Controllable pitch propellers and transverse thrust units: Alarms and safeguards. For azimuth thrusters, see also Pt 5, Ch 20 Azimuth Thrusters.

5.3.2 For controllable pitch propellers for main propulsion, a standby or alternative power source of actuating medium for controlling the pitch of the propelling blades is to be provided. Automatic start of the standby pump supplying hydraulic power for pitch control is to be provided.

5.3.3 Controllable pitch propellers for main propulsion are to be provided with indications of shaft speed, direction and magnitude of thrust and propeller pitch as a measure of the propeller blade or actuator movement at each station from which it is possible to control shaft speed or propeller pitch.

5.3.4 Where transverse thrust units are remotely controlled, means are to be provided at the remote control station to stop the propulsion unit.

5.3.5 Transverse thrust units are to be provided with indications of direction and magnitude of thrust and propeller pitch at each station from which it is possible to control the propeller pitch.