473 

Federal Aviation Administration, DOT 

§ 26.21 

structural maintenance program (here-
after referred to as LOV) that cor-
responds 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 demonstra-
tion must include an evaluation of air-
plane 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 high- 
time airplanes of similar structural de-
sign, accounting for differences in op-
erating conditions and procedures. The 
airplane structural configurations to 
be evaluated include— 

(i) All model variations and deriva-

tives approved under the type certifi-
cate; and 

(ii) All structural modifications to 

and replacements for the airplane 
structural configurations specified in 
paragraph (b)(1)(i) of this section, man-
dated by airworthiness directives as of 
January 14, 2011. 

(2) If the LOV depends on perform-

ance of maintenance actions for which 
service information has not been man-
dated by airworthiness directive as of 
January 14, 2011, submit the following 
to the responsible Aircraft Certifi-
cation 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 compli-
ance 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 com-
ply with that schedule. 

(3) Unless previously accomplished, 

establish an Airworthiness Limitations 
section (ALS) for each airplane struc-
tural 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 air-
plane structural configuration evalu-
ated under paragraph (b)(1) and submit 
it to the responsible Aircraft Certifi-
cation Service office for approval. 

(c) 

Persons who must comply and com-

pliance 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 appli-
cable 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 fol-
lowing dates: 

(i) January 14, 2016; 
(ii) The date the certificate is issued; 

or 

(iii) The date specified in the plan ap-

proved under § 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 ap-

proved under § 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 ap-

proved under § 25.571(b) for completion 

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