367 

Federal Aviation Administration, DOT 

§ 25.1533 

(c) 

Turbine engine installations. Oper-

ating limitations relating to the fol-
lowing must be established for turbine 
engine installations: 

(1) Horsepower, torque or thrust, 

r.p.m., gas temperature, and time for— 

(i) Maximum continuous power or 

thrust (relating to augmented or un-
augmented operation as applicable). 

(ii) Takeoff power or thrust (relating 

to augmented or unaugmented oper-
ation as applicable). 

(2) Fuel designation or specification. 
(3) Maximum time interval between 

engine run-ups from idle, run-up power 
setting and duration at power for 
ground operation in icing conditions, 
as defined in § 25.1093(b)(2). 

(4) Any other parameter for which a 

limitation has been established as part 
of the engine type certificate except 
that a limitation need not be estab-
lished for a parameter that cannot be 
exceeded during normal operation due 
to the design of the installation or to 
another established limitation. 

(d) 

Ambient temperature. An ambient 

temperature limitation (including lim-
itations for winterization installations, 
if applicable) must be established as 
the maximum ambient atmospheric 
temperature established in accordance 
with § 25.1043(b). 

[Amdt. 25–72, 55 FR 29786, July 20, 1990, as 
amended by Amdt. 25–140, 79 FR 65528, Nov. 4, 
2014] 

§ 25.1522

Auxiliary power unit limita-

tions. 

If an auxiliary power unit is installed 

in the airplane, limitations established 
for the auxiliary power unit, including 
categories of operation, must be speci-
fied as operating limitations for the 
airplane. 

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

§ 25.1523

Minimum flight crew. 

The minimum flight crew must be es-

tablished so that it is sufficient for safe 
operation, considering— 

(a) The workload on individual crew-

members; 

(b) The accessibility and ease of oper-

ation of necessary controls by the ap-
propriate crewmember; and 

(c) The kind of operation authorized 

under § 25.1525. 

The criteria used in making the deter-
minations required by this section are 
set forth in appendix D. 

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as 
amended by Amdt. 25–3, 30 FR 6067, Apr. 29, 
1965] 

§ 25.1525

Kinds of operation. 

The kinds of operation to which the 

airplane is limited are established by 
the category in which it is eligible for 
certification and by the installed 
equipment. 

§ 25.1527

Ambient air temperature and 

operating altitude. 

The extremes of the ambient air tem-

perature and operating altitude for 
which operation is allowed, as limited 
by flight, structural, powerplant, func-
tional, or equipment characteristics, 
must be established. 

[Doc. No. 2000–8511, 66 FR 34024, June 26, 2001] 

§ 25.1529

Instructions for Continued 

Airworthiness. 

The applicant must prepare Instruc-

tions for Continued Airworthiness in 
accordance with appendix H to this 
part that are acceptable to the Admin-
istrator. The instructions may be in-
complete at type certification if a pro-
gram exists to ensure their completion 
prior to delivery of the first airplane or 
issuance of a standard certificate of 
airworthiness, whichever occurs later. 

[Amdt. 25–54, 45 FR 60173, Sept. 11, 1980] 

§ 25.1531

Maneuvering flight load fac-

tors. 

Load factor limitations, not exceed-

ing the positive limit load factors de-
termined from the maneuvering dia-
gram in § 25.333(b), must be established. 

§ 25.1533

Additional operating limita-

tions. 

(a) Additional operating limitations 

must be established as follows: 

(1) The maximum takeoff weights 

must be established as the weights at 
which compliance is shown with the 
applicable provisions of this part (in-
cluding the takeoff climb provisions of 
§ 25.121(a) through (c), for altitudes and 
ambient temperatures). 

(2) The maximum landing weights 

must be established as the weights at 

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