spaschal on DSK3GDR082PROD with CFR

Federal Aviation Administration, DOT

Section 26.33

(i) Fuel tanks for which the type certificate holder has notified the FAA
under paragraph (g) of this section that
it will provide design changes and service instructions for Flammability Reduction Means or an Ignition Mitigation Means (IMM) meeting the requirements of paragraph (c) of this section.
(ii) Fuel tanks substantiated to be
conventional unheated aluminum wing
tanks.
(c) Design Changes. For fuel tanks
with a Fleet Average Flammability Exposure exceeding 7 percent, one of the
following design changes must be
made.
(1) Flammability Reduction Means
(FRM). A means must be provided to
reduce the fuel tank flammability.
(i) Fuel tanks that are designed to be
Normally Emptied must meet the
flammability exposure criteria of Appendix M of part 25 of this chapter if
any portion of the tank is located within the fuselage contour.
(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 paragraph 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 damage caused by an ignition will prevent
continued safe flight and landing.
(d) Service Instructions. No later than
December 27, 2010, holders of type certificates 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 instructions 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 responsible Aircraft Certification Service
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 responsible Aircraft Certification Service

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 Airworthiness (ICA). No later than December 27, 2010, holders of type certificates
required by paragraph (c) of this section to make design changes must submit for approval by the responsible
Aircraft Certification Service office,
critical design configuration control
limitations (CDCCL), inspections, 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 degradation of
the performance of any IMM provided
under paragraph (c)(2) of this section.
These CDCCL, inspections, and procedures must be included in the Airworthiness 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 maintenance actions, repairs, or alterations
may compromise the critical design
configuration limitations. These visible means must also be identified as a
CDCCL.
(f) Airworthiness Limitations. Unless
previously accomplished, no later than
December 27, 2010, holders of type certificates affected by this section must
establish an ALS of the maintenance
manual or ICA for each airplane configuration evaluated under paragraph
(b)(1) of this section and submit it to
the responsible Aircraft Certification
Service office for approval. The ALS
must include a section that contains
the CDCCL, inspections, or other procedures developed under paragraph (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 submit to the responsible Aircraft Certification Service office a compliance plan
consisting of the following:
(1) A proposed project schedule for
submitting the required analysis, or a
determination that compliance with

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