§ 27.1549 - Powerplant instruments.

§ 27.1549 Powerplant instruments.

Cross Reference

Link to an amendment published at 88 FR 8738, Feb. 10, 2023.

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 as a green arc or green line, not extending beyond the maximum and minimum safe limitsor unmarked range;

(c) Each takeoff and precautionary range must be marked with a yellow arc range or yellow line;

(d) Each engine or propeller rotor range that is restricted because of excessive vibration stresses must be marked with red arcs ranges 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; Amdt. 27–51, 88 FR 8738, Feb. 10, 2023]