564 

14 CFR Ch. I (1–1–24 Edition) 

§ 27.1549 

placard must state which electrical 
loads, or combination of loads, would 
cause a deviation of more than 10 de-
grees when turned on. 

(Secs. 313(a), 601, 603, 604, and 605 of the Fed-
eral Aviation Act of 1958 (49 U.S.C. 1354(a), 
1421, 1423, 1424, and 1425); and sec. 6(c) of the 
Dept. of Transportation Act (49 U.S.C. 
1655(c))) 

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as 
amended by Amdt. 27–13, 42 FR 36972, July 18, 
1977] 

§ 27.1549

Powerplant instruments. 

For each required powerplant instru-

ment, as appropriate to the type of in-
strument— 

(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 un-
marked 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 vibra-
tion stresses must be marked with red 
ranges or red lines; and 

(e) Each OEI limit or approved oper-

ating range must be marked to be 
clearly differentiated from the mark-
ings 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] 

§ 27.1551

Oil quantity indicator. 

Each oil quantity indicator must be 

marked with enough increments to in-
dicate readily and accurately the quan-
tity of oil. 

§ 27.1553

Fuel quantity indicator. 

If the unusable fuel supply for any 

tank exceeds one gallon, or five per-
cent of the tank capacity, whichever is 
greater, a red arc must be marked on 
its indicator extending from the cali-
brated zero reading to the lowest read-
ing obtainable in level flight. 

§ 27.1555

Control markings. 

(a) Each cockpit control, other than 

primary flight controls or control 
whose function is obvious, must be 
plainly marked as to its function and 
method of operation. 

(b) For powerplant fuel controls— 
(1) Each fuel tank selector control 

must be marked to indicate the posi-
tion corresponding to each tank and to 
each existing cross feed position; 

(2) If safe operation requires the use 

of any tanks in a specific sequence, 
that sequence must be marked on, or 
adjacent to, the selector for those 
tanks; and 

(3) Each valve control for any engine 

of a multiengine rotorcraft must be 
marked to indicate the position cor-
responding to each engine controlled. 

(c) Usable fuel capacity must be 

marked as follows: 

(1) For fuel systems having no selec-

tor controls, the usable fuel capacity of 
the system must be indicated at the 
fuel quantity indicator unless it is: 

(i) Provided by another system or 

equipment readily accessible to the 
pilot; and 

(ii) Contained in the limitations sec-

tion of the rotorcraft flight manual. 

(2) For fuel systems having selector 

controls, the usable fuel capacity 
available at each selector control posi-
tion must be indicated near the selec-
tor control. 

(d) For accessory, auxiliary, and 

emergency controls— 

(1) Each essential visual position in-

dicator, such as those showing rotor 
pitch or landing gear position, must be 
marked so that each crewmember can 
determine at any time the position of 
the unit to which it relates; and 

(2) Each emergency control must be 

red and must be marked as to method 
of operation. 

(e) For rotorcraft incorporating re-

tractable landing gear, the maximum 
landing gear operating speed must be 
displayed in clear view of the pilot. 

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as 
amended by Amdt. 27–11, 41 FR 55470, Dec. 20, 
1976; Amdt. 27–21, 49 FR 44435, Nov. 6, 1984; 
Amdt. 27–51, 88 FR 8738, Feb. 10, 2023] 

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