Thermal/Acoustic Insulation Installed on Transport Category Airplanes, 77748-77752 [05-24654]

Agencies

• Federal Aviation Administration
• DEPARTMENT OF TRANSPORTATION

[Federal Register Volume 70, Number 250 (Friday, December 30, 2005)]
[Rules and Regulations]
[Pages 77748-77752]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 05-24654]



[[Page 77747]]

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Part IX





Department of Transportation





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Federal Aviation Administration



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14 CFR Parts 91, 121, et al.



Thermal/Acoustic Insulation Installed on Transport Category Airplanes; 
Final Rule

Federal Register / Vol. 70, No. 250 / Friday, December 30, 2005 / 
Rules and Regulations

[[Page 77748]]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Parts 91, 121, 125 and 135

[Docket No.: FAA-2005-23462; Amendment Nos. 91-290, 121-320, 125-50, 
and 135-103]
RIN 2120-AI64


Thermal/Acoustic Insulation Installed on Transport Category 
Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule; request for comments.

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SUMMARY: This action modifies the requirements for improved 
flammability characteristics of thermal/acoustic insulation used as 
replacements on airplanes manufactured before September 2, 2005. The 
FAA has recently been provided information that the rule will apply to 
a much broader range of components in currently operating airplanes 
than was originally intended. In addition, since publishing a final 
rule on July 31, 2003, the FAA has learned that some requirements for 
improved flammability covered materials do not have a significant 
effect on airplane fire safety. Further, in many cases, compliant 
replacements are not readily available. This action focuses the 
requirements on replacement materials that have a greater effect on 
safety and are readily available, and is necessary to avoid grounding 
of airplanes.

DATES: This final rule is effective on January 30, 2006. Send your 
comments by February 28, 2006.

ADDRESSES: Address your comments to the Docket Management System, U.S. 
Department of Transportation, Room Plaza 401, 400 Seventh Street, SW., 
Washington, DC 20590-0001. You must identify the docket number FAA-
2005-23462 at the beginning of your comments, and you should submit two 
copies of your comments.
    You may also submit comments through the Internet to https://
dms.dot.gov. You may review the public docket containing comments to 
these regulations in person in the Dockets Office between 9 a.m. and 5 
p.m., Monday through Friday, except Federal holidays. The Dockets 
Office is on the plaza level of the NASSIF Building at the Department 
of Transportation at the above address. Also, you may review public 
dockets on the Internet at https://dms.dot.gov.
    Privacy: We will post all comments we receive, without change, to 
https://dms.dot.gov, including any personal information you provide. For 
more information, see the Privacy Act discussion in the SUPPLEMENTARY 
INFORMATION section of this document.
    Docket: To read background documents or comments received, go to 
https://dms.dot.gov at any time or to Room PL-401 on the plaza level of 
the NASSIF Building, 400 Seventh Street, SW., Washington, DC, between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.

FOR FURTHER INFORMATION CONTACT: Jeff Gardlin, FAA Airframe and Cabin 
Safety Branch, ANM-115, Transport Airplane Directorate, Aircraft 
Certification Service, 1601 Lind Avenue, SW., Renton, Washington 98055-
4056; telephone (425) 227-2136, facsimile (425) 227-1149, e-mail: 
jeff.gardlin@faa.gov.

SUPPLEMENTARY INFORMATION:

Comments Invited

    The FAA is adopting this final rule without prior notice and prior 
public comment. The Regulatory Policies and Procedures of the 
Department of Transportation (DOT) (44 FR 1134; February 26, 1979), 
however, provide that, to the maximum extent possible, operating 
administrations of the DOT should provide an opportunity for public 
comment on regulations issued without prior notice. Accordingly, we 
invite interested persons to participate in this rulemaking by 
submitting such written data, views, or arguments, as they may desire. 
We also invite comments relating to environmental, energy, federalism, 
or international trade impacts that might result from this amendment. 
Please include the regulatory docket or amendment number and send two 
copies to the address above. We will file comments received, as well as 
a report summarizing each substantive public contact with FAA personnel 
on this rulemaking, in the public docket. The docket is available for 
public inspection before and after the comment closing date.
    Anyone is able to search the electronic form of all comments 
received into any of our dockets by the name of the individual 
submitting the comment (or signing the comment, if submitted on behalf 
of an association, business, labor union, etc.). You may review DOT's 
complete Privacy Act statement in the Federal Register published on 
April 11, 2000 (65 FR 19477) or you may visit https://dms.dot.gov.
    The FAA will consider all comments received on or before the 
closing date for comments. We will consider late comments to the extent 
practicable. We may amend this final rule because of the comments 
received.
    Commenters who want the FAA to acknowledge receipt of their 
comments submitted in response to this final rule must include a 
preaddressed, stamped postcard with those comments on which the 
following statement is made: ``Comments to Docket No. FAA-2005-23462.'' 
The postcard will be date-stamped by the FAA and mailed to the 
commenter.

Proprietary or Confidential Business Information

    You should not file in the docket any information that you consider 
to be proprietary or confidential business information. Instead, you 
should send or deliver that information directly to the person 
identified under FOR FURTHER INFORMATION CONTACT. You must mark the 
information that you consider proprietary or confidential. If you send 
the information on a disk or CD ROM, mark the outside of the disk or CD 
ROM and also identify electronically within the disk or CD ROM the 
specific information that is proprietary or confidential.
    Under Title 14 Code of Federal Regulations (CFR) 11.35(b), when we 
are aware of proprietary information filed with a comment, we do not 
place it in the docket. We hold it in a separate file to which the 
public does not have access and place a note in the docket that we have 
received it. If we receive a request to examine or copy this 
information, we treat it as any other request under the Freedom of 
Information Act (5 U.S.C. 552). We process such a request under the DOT 
procedures found in 49 CFR part 7.

Availability of Final Rule

    You can get an electronic copy using the Internet by:
    (1) Searching the Department of Transportation's electronic Docket 
Management System (DMS) Web page (https://dms.dot.gov/search);
    (2) Visiting the FAA's Regulations and Policies Web page at https://
www.faa.gov/regulations_policies/; or
    (3) Accessing the Government Printing Office's Web page at https://
www.gpoaccess.gov/fr/.
    You can also get a copy by sending a request to the Federal 
Aviation Administration, Office of Rulemaking, ARM-1, 800 Independence 
Avenue SW, Washington, DC 20591, or by calling (202) 267-9680. Make 
sure to identify the docket number or amendment number of this 
rulemaking.

[[Page 77749]]

Small Business Regulatory Enforcement Fairness Act

    The Small Business Regulatory Enforcement Fairness Act (SBREFA) of 
1996 requires FAA to comply with small entity requests for information 
or advice about compliance with statutes and regulations within its 
jurisdiction. Therefore, any small entity that has a question regarding 
this document may contact their local FAA official, or the person 
listed under FOR FURTHER INFORMATION CONTACT. You can find out more 
about SBREFA on the Internet at our site, https://www.faa.gov/
regulations_policies/rulemaking/sbre_act/.

Authority for This Rulemaking

    The FAA's authority to issue rules regarding aviation safety is 
found in Title 49 of the United States Code. Subtitle I, Section 106 
describes the authority of the FAA Administrator. Subtitle VII, 
Aviation Programs, describes in more detail the scope of the agency's 
authority.
    This rulemaking is promulgated under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701, ``General 
requirements.'' Under that section, the FAA is charged with promoting 
safe flight of civil aircraft in air commerce by prescribing minimum 
standards required in the interest of safety for the design and 
performance of aircraft. This regulation is within the scope of that 
authority, because it prescribes new safety standards for the design of 
transport category airplanes.

Background

Previous Rulemaking

    On September 20, 2000, we published Notice No. 00-09, which 
proposed to upgrade the flammability and fire protection standards for 
thermal/acoustic insulation installed in transport category airplanes 
(65 FR 56992). The notice contained a provision that would require 
thermal/acoustic insulation to comply with the proposed new standards 
when used as replacements on airplanes already in service, as well as 
requirements relating to newly manufactured airplanes. Notice No. 00-09 
stated:

    Amendments to parts 91, 121, 125, and 135 are proposed to 
require that insulation materials, when installed as replacements, 
meet the new flame propagation test requirements of Sec.  25.856. 
This proposal would provide for the gradual attrition of earlier 
materials. Since there are existing materials that meet the proposed 
standards, and since those materials cost and weigh no more than 
other materials, this should result in no additional cost to 
operators.

    While some commenters questioned whether there was any safety 
benefit in this provision, no commenters presented any information or 
data to contradict the assumptions made in establishing the provision. 
The requirement was adopted in the final rule, published on July 31, 
2003, in Sec. Sec.  91.613(b)(1), 121.312(e)(1), 125.113(c)(1), and 
135.170(c)(1) (68 FR 45046). Operators were required to use replacement 
insulation materials meeting the requirements of Sec.  25.856 after 
September 2, 2005. Our goal was to purge (operator and supplier) stocks 
of materials not meeting the new standards and encourage production of 
only those materials meeting the new standards. Because materials 
meeting the new standards were already available, the rule attributed 
no additional costs to this aspect of the requirements.

Basis of This Change

    Following publication of the fnal rule, and the associated Advisory 
Circular (AC) 25.856-1, and shortly before the September 2, 2005, 
compliance date, industry representatives told us that some assumptions 
in the regulation were not correct. This information was not provided 
during the comment period for Notice No. 00-09, or during the 2-year 
period after the rules were published. While we make every effort to 
anticipate the complete impact of regulatory proposals, one of the 
purposes of the ``notice and comment'' process is to get information 
that we do not have. When affected parties do not comment on a 
regulation, or when they do comment, but do not raise issues of 
concern, we must assume the proposal is accurate. In this case, we did 
not receive inputs during the rulemaking process that would have 
alerted us to the issues. Nonetheless, now that we are aware of the 
issues, we recognize that further rulemaking is needed for several 
reasons.
    First, thermal/acoustic insulation is used much more extensively in 
the fuselage than we originally understood. We did not consider whether 
compliant replacement parts could be efficiently produced for a 
significant number of parts installed on airplane models that are no 
longer in production. Unfortunately, no comments were received to 
address this provision, and it was not until recently that the extent 
of the difference between the actual situation and the assumed 
situation came to light.
    Second, some materials needed to comply with the new requirements 
cost or weigh more than the materials they replace. This is 
particularly true for materials that are used to insulate certain 
equipment or provide acoustic attenuation in specialized applications. 
These materials are not replaced often, but a significant redesign 
would be required to adapt the associated parts to comply with the new 
requirements. Usually, these parts and materials are not maintained in 
large quantities of spares because they are not needed often. However, 
spares might be procured years in advance of the actual need.
    Third, some insulation is integral to another part, and is not 
separately identified as ``insulation.'' Thus, an operator might 
inadvertently replace insulation while replacing another component and 
be out of compliance with the applicable rule. The affected component 
would not be readily identified in the spares inventory as being 
affected by the regulations because its primary function and 
identification were based on something other than thermal/acoustic 
insulation.
    Lastly, certain types of insulation we thought were permanent are 
occasionally replaced. Airframe manufacturers reported that their 
records of supplying replacement insulation to operators showed they 
had never provided replacements for certain parts. However, in actual 
practice, many operators fabricate their own replacement insulation or 
procure it from a third party, using data supplied by the airframe 
manufacturer. All of these issues are complicated for airplane models 
that are no longer in production and for which replacement parts are 
not available from the original equipment manufacturer.
    The issues discussed above do not apply to insulation ``blankets.'' 
Insulation blankets are defined as an encapsulated assembly consisting 
of a core insulating material and a moisture barrier film or cover 
surrounding the core. They represent the largest usage of thermal/
acoustic insulation in the airplane and are, therefore, the most 
significant from a fire safety standpoint. Insulation blankets are most 
often used against the airplane fuselage structure but are also used 
around ducts and under floor panels. The materials used to construct 
compliant insulation blankets are widely available and can be readily 
adapted to different applications, even for airplane models no longer 
in production. The flammability performance of insulation blankets was 
the primary impetus behind development of the new test standards. The 
materials in insulation blankets were one of the primary materials 
intended to be covered by the

[[Page 77750]]

``replacement'' provision in the regulation.
    In addition, insulation around ducts is significant for its 
potential fire safety ramifications. Ducts are intended to convey a 
fluid medium from one point to others and, therefore, provide a 
potential fire propagation path by their nature. Because air ducts are 
the most significant and common, we are limiting the replacement 
provision in this amendment to insulation air ducts only. Therefore, 
other types of piping, or fluid lines are no longer covered by the 
replacement provision. These items, which might otherwise be considered 
ducts, are not included in this amendment because they have very 
specialized insulation needs, and replacement parts are not readily 
available. In addition, they tend to be much smaller than air ducts and 
do not use the large quantity of insulation that was the target of the 
original proposal.
    While some ducts and insulation are integral, meaning that 
replacement of the insulation includes the replacement of the duct, 
many ducts are insulated with separate materials. The July 2003 rule 
will continue to apply to those ducts insulated with separate material. 
However, insulation that is integral to the duct and cannot be replaced 
without replacing the duct, will no longer be covered by the 
regulations for replacement. This includes insulation that is bonded or 
laminated to the surface of the duct. Such insulation that is the 
subject of airworthiness directives must still be replaced in 
accordance with those airworthiness directives.
    This amendment changes only the replacement portion of the July 
2003 rule. This rule does not affect newly manufactured airplanes. 
Airframe manufacturers have worked diligently to achieve compliance for 
newly manufactured airplanes and all the affected parts have been 
addressed. However, for the reasons noted above, a change is necessary 
to address unforeseen issues with availability of replacement parts for 
older airplanes.

Affect on Safety

    This change does not have a significant affect on safety. The 
original intent of the ``replacement'' provision in the regulations was 
to promote the future production only of materials that comply with 14 
CFR 25.856(a) as replacements. We understood that the primary thermal/
acoustic insulation subject to replacement was of blanket construction. 
The regulation was worded generally however, and therefore covered any 
type of thermal/acoustic insulation when it is replaced. As noted 
earlier, the most significant insulation from a fire safety standpoint 
is insulation in blanket form, and insulation on ducts. Replacement of 
these materials with compliant materials will reduce the potential for 
fire propagation. However, for other, less extensive materials, a 
piecemeal replacement with compliant materials has very little, if any 
safety benefit.

Paperwork Reduction Act

    There are no new requirements for information collection associated 
with this amendment.

International Compatibility

    In keeping with U.S. obligations under the Convention on 
International Civil Aviation, it is FAA policy to comply with 
International Civil Aviation Organization (ICAO) Standards and 
Recommended Practices to the maximum extent practicable. The FAA 
determined there are no ICAO Standards and Recommended Practices that 
correspond to these regulations.

Good Cause for Immediate Adoption

    Sections 553(b)(3)(B) and 553(d)(3) of the Administrative 
Procedures Act (APA) (5 U.S.C. 553(b)(3)(B) and 553(d)(3)) authorize 
agencies to dispense with certain notice procedures for rules when they 
find ``good cause'' to do so. Under section 553(b)(3)(B), the 
requirements of notice and opportunity for comment do not apply when 
the agency for good cause finds those procedures are ``impracticable, 
unnecessary, or contrary to the public interest.'' Section 553(d)(3) 
allows an agency, upon finding good cause, to make a rule effective 
immediately, thereby avoiding the 30-day effective date requirement in 
section 553.
    The FAA finds notice and public comment on this final rule are 
impracticable. For the APA, ``impracticable'' means if notice and 
comment procedures were followed, they would defeat the purpose of the 
rule. This final rule must be adopted promptly to create the certainty 
and the time needed by operators to schedule and conduct maintenance, 
and to avoid grounding of airplanes. Coordinating and issuing 
rulemaking documents will take time under current procedures. The delay 
associated with notice and comment would negate the relief offered in 
this final rule, since operators would have to incur great expense to 
prepare for eventual replacement of thermal/acoustic insulation and 
associated components for which no current design meeting the new 
standards exists. Therefore, any delay in issuing this final rule would 
subject affected operators to confusion and the expense of trying to 
comply without the necessary design information and, in some cases, 
availability of appropriate materials. Therefore, it is 
``impracticable'' to provide notice and opportunity to comment.

Executive Order 12866 and DOT Regulatory Policies and Procedures

    Executive Order 12866, Regulatory Planning and Review, directs the 
FAA to assess both the costs and benefits of a regulatory change. We 
are not allowed to propose or adopt a regulation unless we make a 
reasoned determination that the benefits of the intended regulation 
justify its costs. Our assessment of this rule indicates its economic 
impact is minimal. Since its costs and benefits do not make it a 
``significant regulatory action,'' as defined in the Order, we have not 
prepared a ``regulatory impact analysis.'' Similarly, we have not 
prepared a ``regulatory evaluation,'' which is the written cost/benefit 
analysis ordinarily required for all rulemaking under the DOT 
Regulatory and Policies and Procedures. We do not need to do the latter 
analysis where the economic impact of a rule is minimal.

Regulatory Evaluation, Regulatory Flexibility Analysis, International 
Trade Impact Assessment, and Unfunded Mandates Assessment

    Changes to Federal regulations must undergo several economic 
analyses. First, Executive Order 12866 directs that each Federal agency 
shall propose or adopt a regulation only upon a reasoned determination 
that the benefits of the intended regulation justify its costs. Second, 
the Regulatory Flexibility Act of 1980 requires agencies to analyze the 
economic impact of regulatory changes on small entities. Third, the 
Trade Agreements Act (19 U.S.C. 2531-2533) prohibits agencies from 
setting standards that create unnecessary obstacles to the foreign 
commerce of the United States. In developing U.S. standards, this Trade 
Act requires agencies to consider international standards and, where 
appropriate, to be the basis of U.S. standards. Fourth, the Unfunded 
Mandates Reform Act of 1995 (Pub. L. 104-4) requires agencies to 
prepare a written assessment of the costs, benefits, and other effects 
of proposed or final rules that include a Federal mandate likely to 
result in the expenditure by State, local, or tribal governments, in 
the aggregate, or by the private sector, of $100 million or more 
annually (adjusted for inflation). This portion of the preamble 
summarizes the FAA's analysis of the economic impacts of this final 
rule.

[[Page 77751]]

    DOT Order 2100.5 prescribes policies and procedures for 
simplification, analysis, and review of regulations. If the expected 
cost impact is so minimal that a proposal does not warrant a full 
evaluation, this order permits a statement to that effect. The basis 
for the minimal impact must be included in the preamble, if a full 
regulatory evaluation of the cost and benefits is not prepared. Such a 
determination has been made for this rule. The reasoning for that 
determination follows.
    This rule narrows the scope of the requirement to use only 
replacement thermal/acoustic insulation meeting the standards adopted 
in 14 CFR 25.856(a) for airplanes manufactured before September 2, 
2005. The original requirement was sufficiently broad that operators 
could have been out of compliance, even without realizing it. Those 
operators would have been subject to fines and they would have 
experienced maintenance schedule disruptions. By narrowing the scope of 
the requirement, operators can comply with reasonable effort, and the 
safety intent of the original rules is preserved. Although we cannot 
provide a quantitative estimate of the losses resulting from the fines 
and maintenance schedule disruptions, we believe these would have been 
significant. Further, there will be a decrease in overall paperwork and 
costs since fewer part numbers will have to be tracked and updated. 
Finally operators will be able to focus on the most significant 
thermal/acoustic insulation materials and ensure their inventories are 
updated accordingly.
    The FAA has, therefore, determined this rulemaking action is not a 
``significant regulatory action'' as defined in section 3(f) of 
Executive Order 12866, and is not ``significant'' as defined in DOT's 
Regulatory Policies and Procedures. In addition, the FAA has determined 
that this rulemaking action: (1) Will not have a significant economic 
impact on a substantial number of small entities; (2) will not affect 
international trade; and (3) will not impose an unfunded mandate on 
State, local, or tribal governments, or on the private sector.
    This rule simply focuses the compliance requirement for replacement 
materials on those that have a significant safety impact and eliminates 
a burdensome requirement on those replacement materials that do not. 
Thus, this rule maintains the benefits of the existing rule and reduces 
costs.

Regulatory Flexibility Analysis

    The Regulatory Flexibility Act of 1980 (RFA) establishes ``as a 
principle of regulatory issuance that agencies shall endeavor, 
consistent with the objective of the rule and of applicable statutes, 
to fit regulatory and informational requirements to the scale of the 
business, organizations, and governmental jurisdictions subject to 
regulation.'' To achieve that principle, the RFA requires agencies to 
consider flexible regulatory proposals, to explain the rationale for 
their actions, and to solicit comments. The RFA covers a wide range of 
small entities, including small businesses, not-for-profit 
organizations and small governmental jurisdictions.
    Agencies must perform a review to determine whether a proposed or 
final rule will have a significant economic impact on a substantial 
number of small entities. If the agency determines that it will, the 
agency must prepare a regulatory flexibility analysis as described in 
the RFA.
    However, if an agency determines that a proposed or final rule is 
not expected to have a significant economic impact on a substantial 
number of small entities, section 605(b) of the RFA provides the head 
of the agency may so certify and a regulatory flexibility analysis is 
not required. The certification must include a statement providing the 
factual basis for this determination, and the reasoning should be 
clear.
    This rule narrows the scope of the requirement to use only 
replacement thermal/acoustic insulation meeting the standards adopted 
in 14 CFR 25.856(a), for airplanes manufactured before September 2, 
2005. As the rule narrows the scope of compliance, it provides cost 
relief for airplane operators.
    Therefore, as the FAA Administrator, I certify that the rulemaking 
action will not have a significant economic impact on a substantial 
number of small entities.

International Trade Impact Assessment

    The Trade Agreements Act of 1979 prohibits Federal agencies from 
establishing any standards or engaging in related activities that 
create unnecessary obstacles to the foreign commerce of the United 
States. Legitimate domestic objectives, such as safety, are not 
considered unnecessary obstacles. The statute also requires 
consideration of international standards and, where appropriate, that 
these international standards be the basis for U.S. standards. The FAA 
has assessed the potential effect of this rulemaking action and has 
determined that it will provide cost relief for all United States and 
foreign commercial operators of United States registered airplanes. 
Thus this rule reduces costs to both domestic and international 
entities and has a neutral trade impact.

Unfunded Mandates Assessment

    The Unfunded Mandates Reform Act of 1995 (the Act) is intended, 
among other things, to curb the practice of imposing unfunded Federal 
mandates on State, local, and tribal governments. Title II of the Act 
requires each Federal agency to prepare a written statement assessing 
the effects of any Federal mandate in a proposed or final agency rule 
that may result in an expenditure of $100 million or more (adjusted 
annually for inflation) in any one year by State, local, and tribal 
governments, in the aggregate, or by the private sector. The FAA 
currently uses an inflation-adjusted value of $120.7 million in lieu of 
$100 million.
    This final rule does not contain such a mandate. The requirements 
of Title II do not apply.

Executive Order 13132, Federalism

    The FAA has analyzed this final rule under the principles and 
criteria of Executive Order 13132, Federalism. We determined that this 
action will not have a substantial direct effect on the States, or the 
relationship between the National Government and the States, or on the 
distribution of power and responsibilities among the various levels of 
government. We therefore determined that this final rule does not have 
federalism implications.

Plain English

    Executive Order 12866 (58 FR 51735, Oct. 4, 1993) requires each 
agency to write regulations that are simple and easy to understand. We 
invite your comments on how to make these regulations easier to 
understand, including answers to questions such as the following:
     Are the requirements in the regulation clearly stated?
     Does the regulation contain technical language or jargon 
that interferes with their clarity?
     Would the regulation be easier to understand if it was 
divided into more (but shorter) sections?
     Is the description in the preamble helpful in 
understanding the regulation?
    Please send your comments to the address specified in the ADDRESSES 
section.

[[Page 77752]]

Environmental Analysis

    FAA Order 1050.1D defines FAA actions that may be categorically 
excluded from preparation of a National Environmental Policy Act (NEPA) 
environmental impact statement. In accordance with FAA Order 1050.1D, 
appendix 4, paragraph 4(j), this final rule qualifies for a categorical 
exclusion.

Regulations That Significantly Affect Energy Supply, Distribution, or 
Use

    The FAA has analyzed this final rule under Executive Order 13211, 
Actions Concerning Regulations that Significantly Affect Energy Supply, 
Distribution, or Use (66 FR 28355, May 18, 2001). We have determined it 
is not a ``significant energy action'' under the executive order 
because it is not a ``significant regulatory action'' under Executive 
Order 12866, and it is not likely to have a significant adverse effect 
on the supply, distribution, or use of energy.

Lists of Subjects

14 CFR Part 91

    Aircraft, Aviation safety, Reporting and recordkeeping 
requirements.

14 CFR Part 121

    Aircraft, Aviation safety, Reporting and recordkeeping 
requirements, Safety, Transportation.

14 CFR Part 125

    Aircraft, Aviation safety, Reporting and recordkeeping 
requirements.

14 CFR Part 135

    Aircraft, Aviation safety, Reporting and recordkeeping 
requirements.

The Amendments

0
In consideration of the foregoing, the Federal Aviation Administration 
amends Chapter 1 of Title 14 Code of Federal Regulations, as follows:

PART 91--GENERAL OPERATING AND FLIGHT RULES

0
1. The authority citation for part 91 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40103, 40113, 40120, 44101, 44111, 
44701, 44709, 44711, 44712, 44715, 44716, 44717, 44722, 46306, 
46315, 46316, 46502, 46504, 46506-46507, 47122, 47508, 47528-47531.

0
2. Amend Sec.  91.613 by revising paragraph (b)(1) to read as follows:


Sec.  91.613  Materials for compartment interiors.

* * * * *
    (b) Thermal/acoustic insulation materials. For transport category 
airplanes type certificated after January 1, 1958:
    (1) For airplanes manufactured before September 2, 2005, when 
thermal/acoustic insulation is installed in the fuselage as 
replacements after September 2, 2005, the insulation must meet the 
flame propagation requirements of Sec.  25.856 of this chapter, 
effective September 2, 2003, if it is:
    (i) Of a blanket construction or
    (ii) Installed around air ducting.
* * * * *

PART 121--OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL 
OPERATIONS

0
3. The authority citation for part 121 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 40119, 44101, 44701-44702, 
44705, 44709-44711, 44713, 44716-44717, 44722, 44901, 44903-44904, 
44912, 46105.

0
4. Amend Sec.  121.312 by revising paragraph (e)(1) to read as follows:


Sec.  121.312  Materials for compartment interiors.

* * * * *
    (e) Thermal/acoustic insulation materials. For transport category 
airplanes type certificated after January 1, 1958:
    (1) For airplanes manufactured before September 2, 2005, when 
thermal/acoustic insulation is installed in the fuselage as 
replacements after September 2, 2005, the insulation must meet the 
flame propagation requirements of Sec.  25.856 of this chapter, 
effective September 2, 2003, if it is:
    (i) Of a blanket construction or
    (ii) Installed around air ducting.
* * * * *

PART 125--CERTIFICATION AND OPERATIONS: AIRPLANES HAVING A SEATING 
CAPACITY OF 20 OR MORE PASSENGERS OR A MAXIMUM PAYLOAD CAPACITY OF 
6,000 POUNDS OR MORE

0
5. The authority citation for part 125 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701-44702, 44705, 44710-
44711, 44713, 44716--44717, 44722.

0
6. Amend Sec.  125.113 by revising paragraph (c)(1) to read as follows:


Sec.  125.113  Cabin interiors.

* * * * *
    (c) Thermal/acoustic insulation materials. For transport category 
airplanes type certificated after January 1, 1958:
    (1) For airplanes manufactured before September 2, 2005, when 
thermal/acoustic insulation is installed in the fuselage as 
replacements after September 2, 2005, the insulation must meet the 
flame propagation requirements of Sec.  25.856 of this chapter, 
effective September 2, 2003, if it is:
    (i) of a blanket construction or
    (ii) Installed around air ducting.
* * * * *

PART 135--OPERATING REQUIREMENTS: COMMUTER AND ON-DEMAND OPERATIONS 
AND RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT

0
7. The authority citation for part 135 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701-44702, 44705, 44709, 
44711-44713, 44715-44717, 44722.

0
8. Amend Sec.  135.170 by revising paragraph (c)(1) to read as follows:


Sec.  135.170  Materials for compartment interiors.

* * * * *
    (c) Thermal/acoustic insulation materials. For transport category 
airplanes type certificated after January 1, 1958:
    (1) For airplanes manufactured before September 2, 2005, when 
thermal/acoustic insulation is installed in the fuselage as 
replacements after September 2, 2005, the insulation must meet the 
flame propagation requirements of Sec.  25.856 of this chapter, 
effective September 2, 2003, if it is:
    (i) Of a blanket construction, or
    (ii) Installed around air ducting.
* * * * *

    Issued in Washington, DC on December 22, 2005.
Marion C. Blakey,
Administrator.
[FR Doc. 05-24654 Filed 12-29-05; 8:45 am]
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