631 

Federal Aviation Administration, DOT 

§ 26.43 

structure, the basic assumptions ap-
plied in a DTE, and the results of a 
DTE. 

Fatigue critical structure means air-

plane structure that is susceptible to 
fatigue cracking that could contribute 
to a catastrophic failure, as determined 
in accordance with § 25.571 of this chap-
ter. Fatigue critical structure includes 
structure, which, if repaired or altered, 
could be susceptible to fatigue crack-
ing and contribute to a catastrophic 
failure. Such structure may be part of 
the baseline structure or part of an al-
teration. 

Implementation schedule consists of 

documentation that establishes the 
timing for accomplishing the necessary 
actions for developing DT data for re-
pairs and alterations, and for incor-
porating those data into an operator’s 
continuing airworthiness maintenance 
program. The documentation must 
identify times when actions must be 
taken as specific numbers of airplane 
flight hours, flight cycles, or both. 

Published repair data mean instruc-

tions for accomplishing repairs, which 
are published for general use in struc-
tural repair manuals and service bul-
letins (or equivalent types of docu-
ments). 

§ 26.43

Holders of and applicants for 

type certificates—Repairs. 

(a) 

Applicability.  Except as specified 

in paragraph (g) of this section, this 
section applies to transport category, 
turbine powered airplane models with a 
type certificate issued after January 1, 
1958, that as a result of original type 
certification or later increase in capac-
ity have— 

(1) A maximum type certificated pas-

senger seating capacity of 30 or more; 
or 

(2) A maximum payload capacity of 

7,500 pounds or more. 

(b) 

List of fatigue critical baseline struc-

ture.  For airplanes specified in para-
graph (a) of this section, the holder of 
or applicant for a type certificate 
must— 

(1) Identify fatigue critical baseline 

structure for all airplane model vari-
ations and derivatives approved under 
the type certificate; and 

(2) Develop and submit to the FAA 

Oversight Office for review and ap-

proval, a list of the structure identified 
under paragraph (b)(1) of this section 
and, upon approval, make the list 
available to persons required to comply 
with § 26.47 and §§ 121.1109 and 129.109 of 
this chapter. 

(c) 

Existing and future published repair 

data.  For repair data published by a 
holder of a type certificate that is cur-
rent as of January 11, 2008 and for all 
later published repair data, the holder 
of a type certificate must— 

(1) Review the repair data and iden-

tify each repair specified in the data 
that affects fatigue critical baseline 
structure identified under paragraph 
(b)(1) of this section; 

(2) Perform a DTE and develop the 

DTI for each repair identified under 
paragraph (c)(1) of this section, unless 
previously accomplished; 

(3) Submit the DT data to the FAA 

Oversight Office or its properly author-
ized designees for review and approval; 
and 

(4) Upon approval, make the DTI 

available to persons required to comply 
with §§ 121.1109 and 129.109 of this chap-
ter. 

(d) 

Future repair data not published. 

For repair data developed by a holder 
of a type certificate that are approved 
after January 11, 2008 and are not pub-
lished, the type certificate holder must 
accomplish the following for repairs 
specified in the repair data that affect 
fatigue critical baseline structure: 

(1) Perform a DTE and develop the 

DTI. 

(2) Submit the DT data required in 

paragraph (d)(1) of this section for re-
view and approval by the FAA Over-
sight Office or its properly authorized 
designees. 

(3) Upon approval, make the approved 

DTI available to persons required to 
comply with §§ 121.1109 and 129.109 of 
this chapter. 

(e) 

Repair evaluation guidelines. Ex-

cept for airplane models whose type 
certificate is issued after January 11, 
2008, holders of a type certificate for 
each airplane model subject to this sec-
tion must— 

(1) Develop repair evaluation guide-

lines for operators’ use that include— 

(i) A process for conducting surveys 

of affected airplanes that will enable 
identification and documentation of all 

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