369 

Federal Aviation Administration, DOT 

§ 25.1557 

§ 25.1549

Powerplant and auxiliary 

power unit instruments. 

For each required powerplant and 

auxiliary power unit instrument, as ap-
propriate 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 takeoff and precautionary 

range must be marked with a yellow 
arc or a yellow line; and 

(d) Each engine, auxiliary power 

unit, or propeller speed range that is 
restricted because of excessive vibra-
tion stresses must be marked with red 
arcs or red lines. 

[Amdt. 25–40, 42 FR 15044, Mar. 17, 1977] 

§ 25.1551

Oil quantity indication. 

Each oil quantity indicating means 

must be marked to indicate the quan-
tity of oil readily and accurately. 

[Amdt. 25–72, 55 FR 29786, July 20, 1990] 

§ 25.1553

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. 

§ 25.1555

Control markings. 

(a) Each cockpit control, other than 

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

(b) Each aerodynamic control must 

be marked under the requirements of 
§§ 25.677 and 25.699. 

(c) 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 each engine 

must be marked to indicate the posi-

tion corresponding to each engine con-
trolled. 

(d) For accessory, auxiliary, and 

emergency controls— 

(1) Each emergency control (includ-

ing each fuel jettisoning and fluid shut-
off must be colored red; and 

(2) Each visual indicator required by 

§ 25.729(e) must be marked so that the 
pilot can determine at any time when 
the wheels are locked in either extreme 
position, if retractable landing gear is 
used. 

§ 25.1557

Miscellaneous markings and 

placards. 

(a) 

Baggage and cargo compartments 

and ballast location. Each baggage and 
cargo compartment, and each ballast 
location must have a placard stating 
any limitations on contents, including 
weight, that are necessary under the 
loading requirements. However, 
underseat compartments designed for 
the storage of carry-on articles weigh-
ing not more than 20 pounds need not 
have a loading limitation placard. 

(b) 

Powerplant fluid filler openings. 

The following apply: 

(1) Fuel filler openings must be 

marked at or near the filler cover 
with— 

(i) The word ‘‘fuel’’; 
(ii) For reciprocating engine powered 

airplanes, the minimum fuel grade; 

(iii) For turbine engine powered air-

planes, the permissible fuel designa-
tions; and 

(iv) For pressure fueling systems, the 

maximum permissible fueling supply 
pressure and the maximum permissible 
defueling pressure. 

(2) Oil filler openings must be 

marked at or near the filler cover with 
the word ‘‘oil’’. 

(3) Augmentation fluid filler open-

ings must be marked at or near the 
filler cover to identify the required 
fluid. 

(c) 

Emergency exit placards. Each 

emergency exit placard must meet the 
requirements of § 25.811. 

(d) 

Doors.  Each door that must be 

used in order to reach any required 
emergency exit must have a suitable 
placard stating that the door is to be 

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