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476 

14 CFR Ch. I (1–1–24 Edition) 

§ 26.23 

(4) Gulfstream GV–SP. 
(5) British Aerospace, Aircraft Group, 

and Societe Nationale Industrielle 
Aerospatiale Concorde Type 1. 

(6) British Aerospace (Commercial 

Aircraft) Ltd., Armstrong Whitworth 
Argosy A.W. 650 Series 101. 

(7) British Aerospace Airbus, Ltd., 

BAC 1–11. 

(8) BAE Systems (Operations) Ltd., 

BAe 146. 

(9) BAE Systems (Operations) Ltd., 

Avro 146. 

(10) Lockheed 300–50A01 (USAF 

C141A). 

(11) Boeing 707. 
(12) Boeing 720. 
(13) deHavilland D.H. 106 Comet 4C. 
(14) Ilyushin Aviation IL–96T. 
(15) Bristol Aircraft Britannia 305. 
(16) Avions Marcel Dassault-Breguet 

Aviation Mercure 100C. 

(17) Airbus Caravelle. 
(18) D & R Nevada, LLC, Convair 

Model 22. 

(19) D & R Nevada, LLC, Convair 

Model 23M. 

T

ABLE

1—C

OMPLIANCE

D

ATES FOR

A

FFECTED

A

IRPLANES

 

Airplane model 

(all existing

1

models) 

Compliance date— 

(months after January 

14, 2011) 

Airbus: 

A300 Series ....................................................................................................................................

18 

A310 Series, A300–600 Series ......................................................................................................

48 

A318 Series ....................................................................................................................................

48 

A319 Series ....................................................................................................................................

48 

A320 Series ....................................................................................................................................

48 

A321 Series ....................................................................................................................................

48 

A330–200, –200 Freighter, –300 Series ........................................................................................

48 

A340–200, –300, –500, –600 Series ..............................................................................................

48 

A380–800 Series ............................................................................................................................

60 

Boeing: 

717 ..................................................................................................................................................

48 

727 (all series) ................................................................................................................................

18 

737 (Classics): 737–100, –200, –200C, –300, –400, –500 ...........................................................

18 

737 (NG): 737–600, –700, –700C, –800, –900, –900ER ..............................................................

48 

747 (Classics): 747–100, –100B, –100B SUD, –200B, –200C, –200F, –300, 747SP, 747SR .....

18 

747–400: 747–400, –400D, –400F .................................................................................................

48 

757 ..................................................................................................................................................

48 

767 ..................................................................................................................................................

48 

777–200, –300 ................................................................................................................................

48 

777–200LR, 777–300ER, 777F ......................................................................................................

60 

Bombardier: 

CL–600: 2D15 (Regional Jet Series 705), 2D24 (Regional Jet Series 900) .................................

60 

Embraer: 

ERJ 170 ..........................................................................................................................................

60 

ERJ 190 ..........................................................................................................................................

60 

Fokker: 

F.28 Mark 0070, Mark 0100 ...........................................................................................................

18 

Lockheed: 

L–1011 ............................................................................................................................................

18 

188 ..................................................................................................................................................

18 

382 (all series) ................................................................................................................................

18 

McDonnell Douglas: 

DC–8, –8F .......................................................................................................................................

18 

DC–9 ...............................................................................................................................................

18 

MD–80 (DC–9–81, –82, –83, –87, MD–88) ...................................................................................

18 

MD–90 .............................................................................................................................................

48 

DC–10 .............................................................................................................................................

18 

MD–10 .............................................................................................................................................

48 

MD–11, –11F ..................................................................................................................................

48 

All Other Airplane Models Listed on a Type Certificate as of January 14, 2011 ..........................

60 

1

Type certificated as of January 14, 2011. 

[Doc. No. FAA–2006–24281, 75 FR 69782, Nov. 
15, 2010, as amended at 77 FR 30878, May 24, 
2012; Doc. No. FAA–2018–0119, Amdt. 26–7, 83 
FR 9169, Mar. 5, 2018] 

§ 26.23

Extended limit of validity. 

(a) 

Applicability.  Any person may 

apply to extend a limit of validity of 
the engineering data that supports the 

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477 

Federal Aviation Administration, DOT 

§ 26.33 

structural maintenance program (here-
after referred to as LOV) approved 
under § 25.571 of this subchapter, § 26.21, 
or this section. Extending an LOV is a 
major design change. The applicant 
must comply with the relevant provi-
sions of subparts D or E of part 21 of 
this subchapter and paragraph (b) of 
this section. 

(b) 

Extended limit of validity. Each per-

son applying for an extended LOV must 
comply with the following require-
ments: 

(1) Establish an extended LOV that 

corresponds to the period of time, stat-
ed 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 for which approval for an exten-
sion is sought; 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 directive, up to 
the date of approval of the extended 
LOV. 

(2) Establish a revision or supple-

ment, as applicable, to the Airworthi-
ness Limitations section (ALS) of the 
Instructions for Continued Airworthi-
ness required by § 25.1529 of this sub-
chapter, and submit it to the respon-
sible Aircraft Certification Service of-
fice for approval. The revised ALS or 
supplement to the ALS must include 
the applicable extended LOV estab-
lished under paragraph (b)(1) of this 
section. 

(3) Develop the maintenance actions 

determined by the WFD evaluation per-
formed in paragraph (b)(1) of this sec-
tion to be necessary to preclude WFD 
from occurring before the airplane 

reaches the proposed extended LOV. 
These maintenance actions must be 
documented as airworthiness limita-
tion items in the ALS and submitted to 
the responsible Aircraft Certification 
Service office for approval. 

[Docket No. FAA–2006–24281, 75 FR 69782, 
Nov. 15, 2010, as amended by Doc. No. FAA– 
2018–0119, Amdt. 26–7, 83 FR 9169, Mar. 5, 2018] 

Subpart D—Fuel Tank 

Flammability 

S

OURCE

: Docket No. FAA–2005–22997, 73 FR 

42499, July 21, 2008, unless otherwise noted. 

§ 26.31

Definitions. 

For purposes of this subpart— 
(a) 

Fleet Average Flammability Expo-

sure has the meaning defined in Appen-
dix N of part 25 of this chapter. 

(b) 

Normally Emptied means a fuel 

tank other than a Main Fuel Tank. 
Main Fuel Tank is defined in 14 CFR 
25.981(b). 

§ 26.33

Holders of type certificates: 

Fuel tank flammability. 

(a) 

Applicability.  This section applies 

to U.S. type certificated transport cat-
egory, turbine-powered airplanes, other 
than those designed solely for all-cargo 
operations, for which the State of Man-
ufacture issued the original certificate 
of airworthiness or export airworthi-
ness approval on or after January 1, 
1992, that, as a result of original type 
certification or later increase in capac-
ity have: 

(1) A maximum type-certificated pas-

senger capacity of 30 or more, or 

(2) A maximum payload capacity of 

7,500 pounds or more. 

(b) 

Flammability Exposure Analysis. (1) 

General.  Within 150 days after Decem-
ber 26, 2008, holders of type certificates 
must submit for approval to the re-
sponsible Aircraft Certification Service 
office a flammability exposure analysis 
of all fuel tanks defined in the type de-
sign, as well as all design variations 
approved under the type certificate 
that affect flammability exposure. This 
analysis must be conducted in accord-
ance with Appendix N of part 25 of this 
chapter. 

(2) 

Exception.  This paragraph (b) does 

not apply to— 

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