672 

14 CFR Ch. I (1–1–19 Edition) 

§ 29.1519 

variation with forward speed must be 
established, together with any other 
pertinent information, such as the kind 
of landing surface. 

[Amdt. 29–21, 48 FR 4391, Jan. 31, 1983] 

§ 29.1519

Weight and center of gravity. 

The weight and center of gravity lim-

itations determined under §§ 29.25 and 
29.27, respectively, must be established 
as operating limitations. 

§ 29.1521

Powerplant limitations. 

(a) 

General. 

The powerplant limita-

tions prescribed in this section must be 
established so that they do not exceed 
the corresponding limits for which the 
engines are type certificated. 

(b) 

Takeoff operation. 

The powerplant 

takeoff operation must be limited by— 

(1) The maximum rotational speed, 

which may not be greater than— 

(i) The maximum value determined 

by the rotor design; or 

(ii) The maximum value shown dur-

ing the type tests; 

(2) The maximum allowable manifold 

pressure (for reciprocating engines); 

(3) The maximum allowable turbine 

inlet or turbine outlet gas temperature 
(for turbine engines); 

(4) The maximum allowable power or 

torque for each engine, considering the 
power input limitations of the trans-
mission with all engines operating; 

(5) The maximum allowable power or 

torque for each engine considering the 
power input limitations of the trans-
mission with one engine inoperative; 

(6) The time limit for the use of the 

power corresponding to the limitations 
established in paragraphs (b)(1) 
through (5) of this section; and 

(7) If the time limit established in 

paragraph (b)(6) of this section exceeds 
2 minutes— 

(i) The maximum allowable cylinder 

head or coolant outlet temperature (for 
reciprocating engines); and 

(ii) The maximum allowable engine 

and transmission oil temperatures. 

(c) 

Continuous operation. 

The contin-

uous operation must be limited by— 

(1) The maximum rotational speed, 

which may not be greater than— 

(i) The maximum value determined 

by the rotor design; or 

(ii) The maximum value shown dur-

ing the type tests; 

(2) The minimum rotational speed 

shown under the rotor speed require-
ments in § 29.1509(c). 

(3) The maximum allowable manifold 

pressure (for reciprocating engines); 

(4) The maximum allowable turbine 

inlet or turbine outlet gas temperature 
(for turbine engines); 

(5) The maximum allowable power or 

torque for each engine, considering the 
power input limitations of the trans-
mission with all engines operating; 

(6) The maximum allowable power or 

torque for each engine, considering the 
power input limitations of the trans-
mission with one engine inoperative; 
and 

(7) The maximum allowable tempera-

tures for— 

(i) The cylinder head or coolant out-

let (for reciprocating engines); 

(ii) The engine oil; and 
(iii) The transmission oil. 
(d) 

Fuel grade or designation. 

The min-

imum fuel grade (for reciprocating en-
gines) or fuel designation (for turbine 
engines) must be established so that it 
is not less than that required for the 
operation of the engines within the 
limitations in paragraphs (b) and (c) of 
this section. 

(e) 

Ambient temperature. 

Ambient 

temperature limitations (including 
limitations for winterization installa-
tions if applicable) must be established 
as the maximum ambient atmospheric 
temperature at which compliance with 
the cooling provisions of §§ 29.1041 
through 29.1049 is shown. 

(f) 

Two and one-half minute OEI power 

operation. 

Unless otherwise authorized, 

the use of 2

1

⁄

2

-minute OEI power must 

be limited to engine failure operation 
of multiengine, turbine-powered rotor-
craft for not longer than 2

1

⁄

2

minutes 

for any period in which that power is 
used. The use of 2

1

⁄

2

-minute OEI power 

must also be limited by— 

(1) The maximum rotational speed, 

which may not be greater than— 

(i) The maximum value determined 

by the rotor design; or 

(ii) The maximum value shown dur-

ing the type tests; 

(2) The maximum allowable gas tem-

perature; 

(3) The maximum allowable torque; 

and 

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