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479 

Federal Aviation Administration, DOT 

§ 26.35 

paragraph (b) of this section is not re-
quired because design changes and 
service instructions for FRM or IMM 
will be developed and made available as 
required by this section. 

(2) A proposed means of compliance 

with paragraph (b) of this section, if 
applicable. 

(h) 

Compliance Plan for Design 

Changes and Service Instructions. Within 
210 days after December 26, 2008, each 
holder of a type certificate required to 
comply with paragraph (d) of this sec-
tion must submit to the responsible 
Aircraft Certification Service office a 
compliance plan consisting of the fol-
lowing: 

(1) A proposed project schedule, iden-

tifying all major milestones, for meet-
ing the compliance dates specified in 
paragraphs (d), (e) and (f) of this sec-
tion. 

(2) A proposed means of compliance 

with paragraphs (d), (e) and (f) of this 
section. 

(3) A proposal for submitting a draft 

of all compliance items required by 
paragraphs (d), (e) and (f) of this sec-
tion for review by the responsible Air-
craft Certification Service office not 
less than 60 days before the compliance 
times specified in those paragraphs. 

(4) A proposal for how the approved 

service information and any necessary 
modification parts will be made avail-
able to affected persons. 

(i) Each affected type certificate 

holder must implement the compliance 
plans, or later revisions, as approved 
under paragraph (g) and (h) of this sec-
tion. 

[Doc. No. FAA–2005–22997, 73 FR 42499, July 
21, 2008, as amended by Amdt. 26–3, 74 FR 
31619, July 2, 2009; Doc. No. FAA–2018–0119, 
Amdt. 26–7, 83 FR 9169, Mar. 5, 2018] 

§ 26.35

Changes to type certificates af-

fecting fuel tank flammability. 

(a) 

Applicability.  This section applies 

to holders and applicants for approvals 
of the following design changes to any 
airplane subject to 14 CFR 26.33(a): 

(1) Any fuel tank designed to be Nor-

mally Emptied if the fuel tank instal-
lation was approved pursuant to a sup-
plemental type certificate or a field ap-
proval before December 26, 2008; 

(2) Any fuel tank designed to be Nor-

mally Emptied if an application for a 

supplemental type certificate or an 
amendment to a type certificate was 
made before December 26, 2008 and if 
the approval was not issued before De-
cember 26, 2008; and 

(3) If an application for a supple-

mental type certificate or an amend-
ment to a type certificate is made on 
or after December 26, 2008, any of the 
following design changes: 

(i) Installation of a fuel tank de-

signed to be Normally Emptied, 

(ii) Changes to existing fuel tank ca-

pacity, or 

(iii) Changes that may increase the 

flammability exposure of an existing 
fuel tank for which FRM or IMM is re-
quired by § 26.33(c). 

(b) 

Flammability Exposure Analysis—(1) 

General. By the times specified in para-
graphs (b)(1)(i) and (b)(1)(ii) of this sec-
tion, each person subject to this sec-
tion must submit for approval a flam-
mability exposure analysis of the aux-
iliary fuel tanks or other affected fuel 
tanks, as defined in the type design, to 
the responsible Aircraft Certification 
Service office. This analysis must be 
conducted in accordance with Appendix 
N of part 25 of this chapter. 

(i) Holders of supplemental type cer-

tificates and field approvals: Within 12 
months of December 26, 2008, 

(ii) Applicants for supplemental type 

certificates and for amendments to 
type certificates: Within 12 months 
after December 26, 2008, or before the 
certificate is issued, whichever occurs 
later. 

(2) 

Exception. This paragraph does not 

apply to— 

(i) Fuel tanks for which the type cer-

tificate holder, supplemental type cer-
tificate holder, or field approval holder 
has notified the FAA under paragraph 
(f) of this section that it will provide 
design changes and service instructions 
for an IMM meeting the requirements 
of § 25.981(c) in effect December 26, 2008; 
and 

(ii) Fuel tanks substantiated to be 

conventional unheated aluminum wing 
tanks. 

(c) 

Impact Assessment. By the times 

specified in paragraphs (c)(1) and (c)(2) 
of this section, each person subject to 
paragraph (a)(1) of this section holding 
an approval for installation of a Nor-
mally Emptied fuel tank on an airplane 

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480 

14 CFR Ch. I (1–1–24 Edition) 

§ 26.35 

model listed in Table 1 of this section, 
and each person subject to paragraph 
(a)(3)(iii) of this section, must submit 
for approval to the responsible Aircraft 
Certification Service office an assess-
ment of the fuel tank system, as modi-
fied by their design change. The assess-
ment must identify any features of the 
design change that compromise any 
critical design configuration control 
limitation (CDCCL) applicable to any 
airplane on which the design change is 
eligible for installation. 

(1) Holders of supplemental type cer-

tificates and field approvals: Before 
June 26, 2011. 

(2) Applicants for supplemental type 

certificates and for amendments to 
type certificates: Before June 26, 2011 
or before the certificate is issued, 
whichever occurs later. 

T

ABLE

Model—Boeing 

747 Series 
737 Series 
777 Series 
767 Series 
757 Series 

Model—Airbus 

A318, A319, A320, A321 Series 
A300, A310 Series 
A330, A340 Series 

(d) 

Design Changes and Service Instruc-

tions.  By the times specified in para-
graph (e) of this section, each person 
subject to this section must meet the 
requirements of paragraphs (d)(1) or 
(d)(2) of this section, as applicable. 

(1) For holders and applicants subject 

to paragraph (a)(1) or (a)(3)(iii) of this 
section, if the assessment required by 
paragraph (c) of this section identifies 
any features of the design change that 
compromise any CDCCL applicable to 
any airplane on which the design 
change is eligible for installation, the 
holder or applicant must submit for ap-
proval by the responsible Aircraft Cer-
tification Service office design changes 
and service instructions for Flamma-
bility Impact Mitigation Means 
(FIMM) that would bring the design 
change into compliance with the 

CDCCL. Any fuel tank modified as re-
quired by this paragraph must also be 
evaluated as required by paragraph (b) 
of this section. 

(2) Applicants subject to paragraph 

(a)(2), or (a)(3)(i) of this section must 
comply with the requirements of 14 
CFR 25.981, in effect on December 26, 
2008. 

(3) Applicants subject to paragraph 

(a)(3)(ii) of this section must comply 
with the requirements of 14 CFR 26.33. 

(e) 

Compliance Times for Design 

Changes and Service Instructions. The 
following persons subject to this sec-
tion must comply with the require-
ments of paragraph (d) of this section 
at the specified times. 

(1) Holders of supplemental type cer-

tificates and field approvals: Before De-
cember 26, 2012. 

(2) Applicants for supplemental type 

certificates and for amendments to 
type certificates: Before December 26, 
2012, or before the certificate is issued, 
whichever occurs later. 

(f) 

Compliance Planning. By the appli-

cable date specified in Table 2 of this 
section, each person subject to para-
graph (a)(1) of this section must submit 
for approval by the responsible Aircraft 
Certification Service office compliance 
plans for the flammability exposure 
analysis required by paragraph (b) of 
this section, the impact assessment re-
quired by paragraph (c) of this section, 
and the design changes and service in-
structions required by paragraph (d) of 
this section. Each person’s compliance 
plans must include the following: 

(1) A proposed project schedule for 

submitting the required analysis or im-
pact assessment. 

(2) A proposed means of compliance 

with paragraph (d) of this section. 

(3) For the requirements of paragraph 

(d) of this section, a proposal for sub-
mitting a draft of all design changes, if 
any are required, and Airworthiness 
Limitations (including CDCCLs) for re-
view by the responsible Aircraft Cer-
tification Service office not less than 
60 days before the compliance time 
specified in paragraph (e) of this sec-
tion. 

(4) For the requirements of paragraph 

(d) of this section, a proposal for how 
the approved service information and 

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481 

Federal Aviation Administration, DOT 

§ 26.41 

any necessary modification parts will 
be made available to affected persons. 

T

ABLE

2—C

OMPLIANCE

P

LANNING

D

ATES

 

Flammability exposure anal-

ysis plan 

Impact assessment plan 

Design changes and service 

instructions plan 

STC and Field Approval Hold-

ers.

March 26, 2009 ......................

February 26, 2011 ..................

August 26, 2011. 

(g) Each person subject to this sec-

tion must implement the compliance 
plans, or later revisions, as approved 
under paragraph (f) of this section. 

[Doc. No. FAA–2005–22997, 73 FR 42499, July 
21, 2008, as amended by Amdt. 26–3, 74 FR 
31619, July 2, 2009; Doc. No. FAA–2018–0119, 
Amdt. 26–7, 83 FR 9170, Mar. 5, 2018] 

§ 26.37

Pending type certification 

projects: Fuel tank flammability. 

(a) 

Applicability.  This section applies 

to any new type certificate for a trans-
port category airplane, if the applica-
tion was made before December 26, 
2008, and if the certificate was not 
issued before December 26, 2008. This 
section applies only if the airplane 
would 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) If the application was made on or 

after June 6, 2001, the requirements of 
14 CFR 25.981 in effect on December 26, 
2008, apply. 

[Doc. No. FAA–2005–22997, 73 FR 42499, July 
21, 2008, as amended by Amdt. 26–3, 74 FR 
31619, July 2, 2009] 

§ 26.39

Newly produced airplanes: Fuel 

tank flammability. 

(a) 

Applicability:  This section applies 

to Boeing model airplanes specified in 
Table 1 of this section, including pas-
senger and cargo versions of each 
model, when application is made for 
original certificates of airworthiness or 
export airworthiness approvals after 
December 27, 2010. 

T

ABLE

Model—Boeing 

747 Series 
737 Series 
777 Series 
767 Series 

(b) Any fuel tank meeting all of the 

criteria stated in paragraphs (b)(1), 
(b)(2) and (b)(3) of this section must 
have flammability reduction means 
(FRM) or ignition mitigation means 
(IMM) that meet the requirements of 14 
CFR 25.981 in effect on December 26, 
2008. 

(1) The fuel tank is Normally 

Emptied. 

(2) Any portion of the fuel tank is lo-

cated within the fuselage contour. 

(3) The fuel tank exceeds a Fleet Av-

erage Flammability Exposure of 7 per-
cent. 

(c) All other fuel tanks that exceed 

an Fleet Average Flammability Expo-
sure of 7 percent must have an IMM 
that meets 14 CFR 25.981(d) in effect on 
December 26, 2008, or an FRM that 
meets all of the requirements of Appen-
dix M to this part, except instead of 
complying with paragraph M25.1 of 
that appendix, the Fleet Average Flam-
mability Exposure may not exceed 7 
percent. 

[Doc. No. FAA–2005–22997, 73 FR 42499, July 
21, 2008, as amended by Amdt. 26–3, 74 FR 
31619, July 2, 2009] 

Subpart E—Aging Airplane Safe-

ty—Damage Tolerance Data 
for Repairs and Alterations 

S

OURCE

: Docket No. FAA–2005–21693, 72 FR 

70505, Dec. 12, 2007, unless otherwise noted. 

§ 26.41

Definitions. 

Affects (or Affected) means structure 

has been physically repaired, altered, 
or modified, or the structural loads 
acting on the structure have been in-
creased or redistributed. 

Baseline structure means structure 

that is designed under the original type 
certificate or amended type certificate 
for that airplane model. 

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