CS 29.1027 Transmissions and gearboxes: General

• ED Decision 2003/16/RM found in: CS-29 Amdt 10 - Large Rotercraft (Jan 2023)

CS 29.1027 Transmissions and gearboxes: General ED Decision 2003/16/RM (a) The oil system for components of the rotor drive system that require continuous lubrication must be sufficiently independent of the lubrication systems of the engine(s) to ensure: (1) Operation with any engine inoperative; and (2) Safe autorotation. (b) Pressure lubrication systems for transmissions and gearboxes must comply with the requirements of [CS 29.1013](#_DxCrossRefBm1513259635), sub-paragraphs (c), (d) and (f) only, [CS 29.1015](#_DxCrossRefBm1513259636), [29.1017](#_DxCrossRefBm1513259637), [29.1021](#_DxCrossRefBm1513259639), [29.1023](#_DxCrossRefBm1513259640) and [29.1337(d)](#_DxCrossRefBm1513259593). In addition, the system must have: (1) An oil strainer or filter through which all the lubricant flows, and must: (i) Be designed to remove from the lubricant any contaminant which may damage transmission and drive system components or impede the flow of lubricant to a hazardous degree; and (ii) Be equipped with a bypass constructed and installed so that: (A) The lubricant will flow at the normal rate through the rest of the system with the strainer or filter completely blocked; and (B) The release of collected contaminants is minimised by appropriate location of the bypass to ensure that collected contaminants are not in the bypass flow path; (iii) Be equipped with a means to indicate collection of contaminants on the filter or strainer at or before opening of the bypass; (2) For each lubricant tank or sump outlet supplying lubrication to rotor drive systems and rotor drive system components, a screen to prevent entrance into the lubrication system of any object that might obstruct the flow of lubricant from the outlet to the filter required by sub-paragraph (b)(1). The requirements of sub-paragraph (b)(1) do not apply to screens installed at lubricant tank or sump outlets. (c) Splash type lubrication systems for rotor drive system gearboxes must comply with [CS 29.1021](#_DxCrossRefBm1513259639) and [29.1337(d)](#_DxCrossRefBm1513259593). CS 29.1027 Transmissions and gearboxes: General ED Decision 2003/16/RM (a) The oil system for components of the rotor drive system that require continuous lubrication must be sufficiently independent of the lubrication systems of the engine(s) to ensure: (1) Operation with any engine inoperative; and (2) Safe autorotation. (b) Pressure lubrication systems for transmissions and gearboxes must comply with the requirements of [CS 29.1013](#_DxCrossRefBm1178332042), sub-paragraphs (c), (d) and (f) only, [CS 29.1015](#_DxCrossRefBm1178332043), [29.1017](#_DxCrossRefBm1178332044), [29.1021](#_DxCrossRefBm1178332046), [29.1023](#_DxCrossRefBm1178332047) and [29.1337(d)](#_DxCrossRefBm1178331996). In addition, the system must have: (1) An oil strainer or filter through which all the lubricant flows, and must: (i) Be designed to remove from the lubricant any contaminant which may damage transmission and drive system components or impede the flow of lubricant to a hazardous degree; and (ii) Be equipped with a bypass constructed and installed so that: (A) The lubricant will flow at the normal rate through the rest of the system with the strainer or filter completely blocked; and (B) The release of collected contaminants is minimised by appropriate location of the bypass to ensure that collected contaminants are not in the bypass flow path; (iii) Be equipped with a means to indicate collection of contaminants on the filter or strainer at or before opening of the bypass; (2) For each lubricant tank or sump outlet supplying lubrication to rotor drive systems and rotor drive system components, a screen to prevent entrance into the lubrication system of any object that might obstruct the flow of lubricant from the outlet to the filter required by sub-paragraph (b)(1). The requirements of sub-paragraph (b)(1) do not apply to screens installed at lubricant tank or sump outlets. (c) Splash type lubrication systems for rotor drive system gearboxes must comply with [CS 29.1021](#_DxCrossRefBm1178332046) and [29.1337(d)](#_DxCrossRefBm1178331996). #### CS 29.1027 Transmissions and gearboxes: General *ED Decision 2003/16/RM* (a) The oil system for components of the rotor drive system that require continuous lubrication must be sufficiently independent of the lubrication systems of the engine(s) to ensure: (1) Operation with any engine inoperative; and (2) Safe autorotation. (b) Pressure lubrication systems for transmissions and gearboxes must comply with the requirements of [CS 29.1013](#_DxCrossRefBm1685772507), sub-paragraphs (c), (d) and (f) only, [CS 29.1015](#_DxCrossRefBm1685772508), [29.1017](#_DxCrossRefBm1685772509), [29.1021](#_DxCrossRefBm1685772511), [29.1023](#_DxCrossRefBm1685772512) and [29.1337(d)](#_DxCrossRefBm1685772461). In addition, the system must have: (1) An oil strainer or filter through which all the lubricant flows, and must: (i) Be designed to remove from the lubricant any contaminant which may damage transmission and drive system components or impede the flow of lubricant to a hazardous degree; and (ii) Be equipped with a bypass constructed and installed so that: (A) The lubricant will flow at the normal rate through the rest of the system with the strainer or filter completely blocked; and (B) The release of collected contaminants is minimised by appropriate location of the bypass to ensure that collected contaminants are not in the bypass flow path; (iii) Be equipped with a means to indicate collection of contaminants on the filter or strainer at or before opening of the bypass; (2) For each lubricant tank or sump outlet supplying lubrication to rotor drive systems and rotor drive system components, a screen to prevent entrance into the lubrication system of any object that might obstruct the flow of lubricant from the outlet to the filter required by sub-paragraph (b)(1). The requirements of sub-paragraph (b)(1) do not apply to screens installed at lubricant tank or sump outlets. (c) Splash type lubrication systems for rotor drive system gearboxes must comply with [CS 29.1021](#_DxCrossRefBm1685772511) and [29.1337(d)](#_DxCrossRefBm1685772461).