---
kind: "range"
citation: "14 C.F.R. §§ 27.1549–27.1553"
title: "14"
from: "27.1549"
to: "27.1553"
count: 3
url: "https://uscodex.org/cfr/14/27.1549..27.1553"
---

# §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 line;
- (b) Each normal operating range must be marked as a green or unmarked range;
- (c) Each takeoff and precautionary range must be marked with a yellow range or yellow line;
- (d) Each engine or rotor 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 [paragraphs (a) through (d)](#a..d) of this section except that no marking is normally required for the 30-second OEI limit.

# §27.1551. Oil quantity indicator.


Each oil quantity indicator must be marked with enough increments to indicate readily and accurately the quantity of oil.


# §27.1553. Fuel quantity indicator.


If the unusable fuel supply for any tank exceeds one gallon, or five percent of the tank capacity, whichever is greater, a red arc must be marked on its indicator extending from the calibrated zero reading to the lowest reading obtainable in level flight.