Code of Federal Regulations

Title 14 - Aeronautics and Space
Volume: 1Date: 2023-01-01Original Date: 2023-01-01Title: Section 27.1549 - Powerplant instruments.Context: Title 14 - Aeronautics and Space. CHAPTER I - FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION. SUBCHAPTER C - AIRCRAFT. PART 27 - AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT. Subpart G - Operating Limitations and Information. - Markings and Placards.
§ 27.1549 Powerplant instruments. 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 takeoff 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 paragraphs (a) through (d) of this section except that no marking is normally required for the 30-second OEI limit. [Amdt. 27–11, 41 FR 55470, Dec. 20, 1976, as amended by Amdt. 27–23, 53 FR 34215, Sept. 2, 1988; Amdt. 27–29, 59 FR 47768, Sept. 16, 1994]