195 

Federal Aviation Administration, DOT 

Pt. 25 

(e) Information needed to apply protective 

treatments to the structure after inspection. 

(f) All data relative to structural fasteners 

such as identification, discard recommenda-
tions, and torque values. 

(g) A list of special tools needed. 
(h) In addition, for level 4 airplanes, the 

following information must be furnished— 

(1) Electrical loads applicable to the var-

ious systems; 

(2) Methods of balancing control surfaces; 
(3) Identification of primary and secondary 

structures; and 

(4) Special repair methods applicable to 

the airplane. 

A23.4

Airworthiness limitations section. 

The Instructions for Continued Airworthi-

ness must contain a section titled Airworthi-
ness Limitations that is segregated and 
clearly distinguishable from the rest of the 
document. This section must set forth each 
mandatory replacement time, structural in-
spection interval, and related structural in-
spection procedure required for type certifi-
cation. If the Instructions for Continued Air-
worthiness consist of multiple documents, 
the section required by this paragraph must 
be included in the principal manual. This 
section must contain a legible statement in 
a prominent location that reads ‘‘The Air-
worthiness Limitations section is FAA ap-
proved and specifies maintenance required 
under §§ 43.16 and 91.403 of Title 14 of the Code 
of Federal Regulations unless an alternative 
program has been FAA approved.’’ 

PART 25—AIRWORTHINESS STAND-

ARDS: TRANSPORT CATEGORY 
AIRPLANES 

S

PECIAL

F

EDERAL

A

VIATION

R

EGULATION

N

O

. 

13 

S

PECIAL

F

EDERAL

A

VIATION

R

EGULATION

N

O

. 

109 

Subpart A—General 

Sec. 
25.1

Applicability. 

25.2

Special retroactive requirements. 

25.3

Special provisions for ETOPS type de-

sign approvals. 

25.5

Incorporations by reference. 

Subpart B—Flight 

G

ENERAL

 

25.21

Proof of compliance. 

25.23

Load distribution limits. 

25.25

Weight limits. 

25.27

Center of gravity limits. 

25.29

Empty weight and corresponding cen-

ter of gravity. 

25.31

Removable ballast. 

25.33

Propeller speed and pitch limits. 

P

ERFORMANCE

 

25.101

General. 

25.103

Stall speed. 

25.105

Takeoff. 

25.107

Takeoff speeds. 

25.109

Accelerate-stop distance. 

25.111

Takeoff path. 

25.113

Takeoff distance and takeoff run. 

25.115

Takeoff flight path. 

25.117

Climb: general. 

25.119

Landing climb: All-engines-operating. 

25.121

Climb: One-engine-inoperative. 

25.123

En route flight paths. 

25.125

Landing. 

C

ONTROLLABILITY AND

M

ANEUVERABILITY

 

25.143

General. 

25.145

Longitudinal control. 

25.147

Directional and lateral control. 

25.149

Minimum control speed. 

T

RIM

 

25.161

Trim. 

S

TABILITY

 

25.171

General. 

25.173

Static longitudinal stability. 

25.175

Demonstration of static longitudinal 

stability. 

25.177

Static lateral-directional stability. 

25.181

Dynamic stability. 

S

TALLS

 

25.201

Stall demonstration. 

25.203

Stall characteristics. 

25.207

Stall warning. 

G

ROUND AND

W

ATER

H

ANDLING

 

C

HARACTERISTICS

 

25.231

Longitudinal stability and control. 

25.233

Directional stability and control. 

25.235

Taxiing condition. 

25.237

Wind velocities. 

25.239

Spray characteristics, control, and 

stability on water. 

M

ISCELLANEOUS

F

LIGHT

R

EQUIREMENTS

 

25.251

Vibration and buffeting. 

25.253

High-speed characteristics. 

25.255

Out-of-trim characteristics. 

Subpart C—Structure 

G

ENERAL

 

25.301

Loads. 

25.303

Factor of safety. 

25.305

Strength and deformation. 

25.307

Proof of structure. 

F

LIGHT

L

OADS

 

25.321

General. 

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