5.1.1 The piping system for a controllable pitch propeller is to comply with the general design requirements given in Pt 15 Piping Systems and Pressure Plant.
5.1.2 The specific requirements for lubricating hydraulic oil systems and standby arrangements are given in Pt 15 Piping Systems and Pressure Plant.
5.1.3 The hydraulic power operating systems are to be provided with arrangements to maintain the cleanliness of the hydraulic fluid, taking into consideration the type and design of the hydraulic system.