CS 25.1549 Powerplant instruments
ED Decision 2003/2/RM
(See AMC 25.1549)
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 a yellow line; and
(d) Each engine or propeller speed range that is restricted because of excessive vibration stresses must be marked with red arcs or red lines.
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