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.
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