627 

Federal Aviation Administration, DOT 

§ 26.33 

(ii) For all other fuel tanks, the FRM 

must meet all of the requirements of 
Appendix M of part 25 of this chapter, 
except, instead of complying with para-
graph M25.1 of this appendix, the Fleet 
Average Flammability Exposure may 
not exceed 7 percent. 

(2) 

Ignition Mitigation Means (IMM). A 

means must be provided to mitigate 
the effects of an ignition of fuel vapors 
within the fuel tank such that no dam-
age caused by an ignition will prevent 
continued safe flight and landing. 

(d) 

Service Instructions. No later than 

December 27, 2010, holders of type cer-
tificates required by paragraph (c) of 
this section to make design changes 
must meet the requirements specified 
in either paragraph (d)(1) or (d)(2) of 
this section. The required service in-
structions must identify each airplane 
subject to the applicability provisions 
of paragraph (a) of this section. 

(1) 

FRM. The type certificate holder 

must submit for approval by the FAA 
Oversight Office design changes and 
service instructions for installation of 
fuel tank flammability reduction 
means (FRM) meeting the criteria of 
paragraph (c) of this section. 

(2) 

IMM. The type certificate holder 

must submit for approval by the FAA 
Oversight Office design changes and 
service instructions for installation of 
fuel tank IMM that comply with 14 
CFR 25.981(c) in effect on December 26, 
2008. 

(e) 

Instructions for Continued Air-

worthiness (ICA). No later than Decem-
ber 27, 2010, holders of type certificates 
required by paragraph (c) of this sec-
tion to make design changes must sub-
mit for approval by the FAA Oversight 
Office, critical design configuration 
control limitations (CDCCL), inspec-
tions, or other procedures to prevent 
increasing the flammability exposure 
of any tanks equipped with FRM above 
that permitted under paragraph (c)(1) 
of this section and to prevent degrada-
tion of the performance of any IMM 
provided under paragraph (c)(2) of this 
section. These CDCCL, inspections, and 
procedures must be included in the Air-
worthiness Limitations Section (ALS) 
of the ICA required by 14 CFR 25.1529 or 
paragraph (f) of this section. Unless 
shown to be impracticable, visible 
means to identify critical features of 

the design must be placed in areas of 
the airplane where foreseeable mainte-
nance actions, repairs, or alterations 
may compromise the critical design 
configuration limitations. These visi-
ble means must also be identified as a 
CDCCL. 

(f) 

Airworthiness Limitations. Unless 

previously accomplished, no later than 
December 27, 2010, holders of type cer-
tificates affected by this section must 
establish an ALS of the maintenance 
manual or ICA for each airplane con-
figuration evaluated under paragraph 
(b)(1) of this section and submit it to 
the FAA Oversight Office for approval. 
The ALS must include a section that 
contains the CDCCL, inspections, or 
other procedures developed under para-
graph (e) of this section. 

(g) 

Compliance Plan for Flammability 

Exposure Analysis. Within 90 days after 
December 26, 2008, each holder of a type 
certificate required to comply with 
paragraph (b) of this section must sub-
mit to the FAA Oversight Office a com-
pliance plan consisting of the fol-
lowing: 

(1) A proposed project schedule for 

submitting the required analysis, or a 
determination that compliance with 
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 FAA Oversight 
Office a compliance plan consisting of 
the following: 

(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 FAA Oversight 

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