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471 

Federal Aviation Administration, DOT 

§ 26.5 

as critical as the specific ice accretion de-
fined for that flight phase. Configuration dif-
ferences and their effects on ice accretions 
must be taken into account. 

(f) The ice accretion that has the most ad-

verse effect on handling qualities may be 
used for airplane performance tests provided 
any difference in performance is conserv-
atively taken into account. 

[Amdt. 25–140, 79 FR 65528, Nov. 4, 2014] 

PART 26—CONTINUED AIRWORTHI-

NESS AND SAFETY IMPROVE-
MENTS FOR TRANSPORT CAT-
EGORY AIRPLANES 

Subpart A—General 

Sec. 
26.1

Purpose and scope. 

26.3

[Reserved] 

26.5

Applicability table. 

Subpart B—Enhanced Airworthiness 

Program for Airplane Systems 

26.11

Electrical wiring interconnection sys-

tems (EWIS) maintenance program. 

Subpart C—Aging Airplane Safety— 

Widespread Fatigue Damage 

26.21

Limit of validity. 

26.23

Extended limit of validity. 

Subpart D—Fuel Tank Flammability 

26.31

Definitions. 

26.33

Holders of type certificates: Fuel tank 

flammability. 

26.35

Changes to type certificates affecting 

fuel tank flammability. 

26.37

Pending type certification projects: 

Fuel tank flammability. 

26.39

Newly produced airplanes: Fuel tank 

flammability. 

Subpart E—Aging Airplane Safety—Dam-

age Tolerance Data for Repairs and 
Alterations 

26.41

Definitions. 

26.43

Holders of and applicants for type cer-

tificates—Repairs. 

26.45

Holders of type certificates—Alter-

ations and repairs to alterations. 

26.47

Holders of and applicants for a supple-

mental type certificate—Alterations and 
repairs to alterations. 

26.49

Compliance plan. 

A

UTHORITY

: 49 U.S.C. 106(g), 40113, 44701, 

44702 and 44704. 

S

OURCE

: Docket No. FAA–2004–18379, 72 FR 

63409, Nov. 8, 2007, unless otherwise noted. 

Subpart A—General 

§ 26.1

Purpose and scope. 

(a) This part establishes require-

ments for support of the continued air-
worthiness of and safety improvements 
for transport category airplanes. These 
requirements may include performing 
assessments, developing design 
changes, developing revisions to In-
structions for Continued Airworthiness 
(ICA), and making necessary docu-
mentation available to affected per-
sons. Requirements of this part that 
establish standards for design changes 
and revisions to the ICA are considered 
airworthiness requirements. 

(b) Except as provided in paragraph 

(c) of this section, this part applies to 
the following persons, as specified in 
each subpart of this part: 

(1) Holders of type certificates and 

supplemental type certificates. 

(2) Applicants for type certificates 

and supplemental type certificates and 
changes to those certificates (including 
service bulletins describing design 
changes). 

(3) Persons seeking design approval 

for airplane repairs, alterations, or 
modifications that may affect air-
worthiness. 

(4) Holders of type certificates and 

their licensees producing new air-
planes. 

(c) An applicant for approval of a de-

sign change is not required to comply 
with any applicable airworthiness re-
quirement of this part if the applicant 
elects or is required to comply with a 
corresponding amendment to part 25 of 
this chapter that is adopted concur-
rently or after that airworthiness re-
quirement. 

(d) For the purposes of this part, the 

word ‘‘type certificate’’ does not in-
clude supplemental type certificates. 

§ 26.3

[Reserved] 

§ 26.5

Applicability table. 

Table 1 of this section provides an 

overview of the applicability of this 
part. It provides guidance in identi-
fying what sections apply to various 
types of entities. The specific applica-
bility of each subpart and section is 
specified in the regulatory text. 

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