CS 27.1549 Powerplant instruments

• ED Decision 2023/001/R found in: CS-27 Amdt 10 - Small Rotorcraft (Feb 2023)
• ED Decision 2003/15/RM found in: CS-27 Amdt 9 - Small Rotorcraft (Dec 2021)

CS 27.1549 Powerplant instruments ED Decision 2023/001/R For each required powerplant instrument, as appropriate to the type of instrument: (a) Each maximum and, if applicable, minimum safe operating limit must be marked with a red line; (b) Each normal operating range must be depicted as a green or unmarked range; (c) Each take-off and precautionary range must be marked with a yellow range or yellow line; (d) Each engine or propeller range that is restricted because of excessive vibration stresses must be marked with red ranges or red lines; and (e) Each OEI limit or approved operating range must be marked to be clearly differentiated from the markings of sub-paragraphs (a) to (d) except that no marking is normally required for the 30-second OEI limit. CS 27.1549 Powerplant instruments ED Decision 2003/15/RM For each required powerplant instrument, as appropriate to the type of instrument: (a) Each maximum and, if applicable, minimum safe operating limit must be marked with a red radial or a red line; (b) Each normal operating range must be marked with a green arc or green line, not extending beyond the maximum and minimum safe limits; (c) Each take-off and precautionary range must be marked with a yellow arc or yellow line; (d) Each engine or propeller range that is restricted because of excessive vibration stresses must be marked with red arcs or red lines; and (e) Each OEI limit or approved operating range must be marked to be clearly differentiated from the markings of sub-paragraphs (a) to (d) except that no marking is normally required for the 30-second OEI limit.