spaschal on DSK3GDR082PROD with CFR

Federal Aviation Administration, DOT

Section 26.43

Damage Tolerance Evaluation (DTE)
means a process that leads to a determination of maintenance actions necessary to detect or preclude fatigue
cracking that could contribute to a
catastrophic failure. As applied to repairs and alterations, a DTE includes
the evaluation both of the repair or alteration and of the fatigue critical
structure affected by the repair or alteration.
Damage Tolerance Inspection (DTI)
means the inspection developed as a result of a DTE. A DTI includes the areas
to be inspected, the inspection method,
the inspection procedures, including
acceptance and rejection criteria, the
threshold, and any repeat intervals associated with those inspections. The
DTI may specify a time limit when a
repair or alteration needs to be replaced or modified. If the DTE concludes that DT-based supplemental
structural inspections are not necessary, the DTI contains a statement
to that effect.
DT data mean DTE documentation
and the DTI.
DTE documentation means data that
identify the evaluated fatigue critical
structure, the basic assumptions applied in a DTE, and the results of a
DTE.
Fatigue critical structure means airplane structure that is susceptible to
fatigue cracking that could contribute
to a catastrophic failure, as determined
in accordance with Section 25.571 of this chapter. Fatigue critical structure includes
structure, which, if repaired or altered,
could be susceptible to fatigue cracking and contribute to a catastrophic
failure. Such structure may be part of
the baseline structure or part of an alteration.
Implementation schedule consists of
documentation that establishes the
timing for accomplishing the necessary
actions for developing DT data for repairs and alterations, and for incorporating 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 instructions for accomplishing repairs, which
are published for general use in struc-

tural repair manuals and service bulletins (or equivalent types of documents).
Section 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 capacity have - 
(1) A maximum type certificated passenger seating capacity of 30 or more;
or
(2) A maximum payload capacity of
7,500 pounds or more.
(b) List of fatigue critical baseline structure. For airplanes specified in paragraph (a) of this section, the holder of
or applicant for a type certificate
must - 
(1) Identify fatigue critical baseline
structure for all airplane model variations and derivatives approved under
the type certificate; and
(2) Develop and submit to the responsible Aircraft Certification Service office for review and approval, 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 Section 26.47
and SectionSection 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 current 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 identify 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 responsible Aircraft Certification Service office or its properly authorized designees for review and approval; and
(4) Upon approval, make the DTI
available to persons required to comply

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