spaschal on DSK3GDR082PROD with CFR

Federal Aviation Administration, DOT

Section 26.21

structural maintenance program (hereafter referred to as LOV) that corresponds to the period of time, stated
as a number of total accumulated
flight cycles or flight hours or both,
during which it is demonstrated that
widespread fatigue damage will not
occur in the airplane. This demonstration must include an evaluation of airplane structural configurations and be
supported by test evidence and analysis
at a minimum and, if available, service
experience, or service experience and
teardown inspection results, of hightime airplanes of similar structural design, accounting for differences in operating conditions and procedures. The
airplane structural configurations to
be evaluated include - 
(i) All model variations and derivatives approved under the type certificate; and
(ii) All structural modifications to
and replacements for the airplane
structural configurations specified in
paragraph (b)(1)(i) of this section, mandated by airworthiness directives as of
January 14, 2011.
(2) If the LOV depends on performance of maintenance actions for which
service information has not been mandated by airworthiness directive as of
January 14, 2011, submit the following
to the responsible Aircraft Certification Service office:
(i) For those maintenance actions for
which service information has been
issued as of the applicable compliance
date specified in paragraph (c) of this
section, a list identifying each of those
actions.
(ii) For those maintenance actions
for which service information has not
been issued as of the applicable compliance date specified in paragraph (c) of
this section, a list identifying each of
those actions and a binding schedule
for providing in a timely manner the
necessary service information for those
actions. Once the responsible Aircraft
Certification Service office approves
this schedule, each person identified in
paragraph (c) of this section must comply with that schedule.
(3) Unless previously accomplished,
establish an Airworthiness Limitations
section (ALS) for each airplane structural configuration evaluated under
paragraph (b)(1) of this section.

(4) Incorporate the applicable LOV
established under paragraph (b)(1) of
this section into the ALS for each airplane structural configuration evaluated under paragraph (b)(1) and submit
it to the responsible Aircraft Certification Service office for approval.
(c) Persons who must comply and compliance dates. The following persons
must comply with the requirements of
paragraph (b) of this section by the
specified date.
(1) Holders of type certificates (TC)
of airplane models identified in Table 1
of this section: No later than the applicable date identified in Table 1 of this
section.
(2) Applicants for TCs, if the date of
application was before January 14, 2011:
No later than the latest of the following dates:
(i) January 14, 2016;
(ii) The date the certificate is issued;
or
(iii) The date specified in the plan approved under Section 25.571(b) for completion
of the full-scale fatigue testing and
demonstrating that widespread fatigue
damage will not occur in the airplane
structure.
(3) Applicants for amendments to
TCs, with the exception of amendments
to TCs specified in paragraphs (c)(6) or
(c)(7) of this section, if the original TC
was issued before January 14, 2011: No
later than the latest of the following
dates:
(i) January 14, 2016;
(ii) The date the amended certificate
is issued; or
(iii) The date specified in the plan approved under Section 25.571(b) for completion
of the full-scale fatigue testing and
demonstrating that widespread fatigue
damage will not occur in the airplane
structure.
(4) Applicants for amendments to
TCs, with the exception of amendments
to TCs specified in paragraphs (c)(6) or
(c)(7) of this section, if the application
for the original TC was made before
January 14, 2011 but the TC was not
issued before January 14, 2011: No later
than the latest of the following dates:
(i) January 14, 2016;
(ii) The date the amended certificate
is issued; or
(iii) The date specified in the plan approved under Section 25.571(b) for completion

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