This section of the FEDERAL REGISTER

contains regulatory documents having general

applicability and legal effect, most of which

are keyed to and codified in the Code of

Federal Regulations, which is published under

50 titles pursuant to 44 U.S.C. 1510.

The Code of Federal Regulations is sold by

the Superintendent of Documents. Prices of

new books are listed in the first FEDERAL

REGISTER issue of each week.

Rules and Regulations Federal Register

5707 

Vol. 78, No. 18 

Monday, January 28, 2013 

1AD 2012–11–09, Airworthiness Directives; 

Various Transport Category Airplanes (Docket No. 

FAA–2012–0102), 77 FR 38000, June 26, 2012. 

2AD 2011–04–09, Airworthiness Directives; 

Various Transport Category Airplanes Equipped 

with Chemical Oxygen Generators Installed in a 

Lavatory (Docket No. FAA–2011–0157). 76 FR 

12556, March 8, 2011. 3 77 FR 11418, February 27, 2012. 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 121 

[Docket No. FAA–2011–0186; Amendment 

Nos. 121–362] 

RIN 2120–AK14 

Lavatory Oxygen Systems 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: This action adds termination 

criteria and an expiration date to 

Special Federal Aviation Regulation 

111, which temporarily authorizes 

variances from existing standards 

related to the provisioning of 

supplemental oxygen inside lavatories. 

This action is necessitated by the 

publication of Airworthiness Directive 

2012–11–09, which mandates actions 

that restore supplemental oxygen to 

lavatories. 

DATES: This final rule is effective March 

29, 2013. 

ADDRESSES: For information on where to 

obtain copies of rulemaking documents 

and other information related to this 

final rule, see ‘‘How To Obtain 

Additional Information’’ in the 

SUPPLEMENTARY INFORMATION section of 

this document. 

FOR FURTHER INFORMATION CONTACT: Jeff 

Gardlin, Airframe and Cabin Safety 

Branch, ANM–115, Transport Airplane 

Directorate, Aircraft Certification 

Service, Federal Aviation 

Administration, Northwest Mountain 

Region, 1601 Lind Avenue SW., Renton, 

WA 98057–3356; telephone: (425) 227– 

2136; email: jeff.gardlin@faa.gov. 

For legal questions concerning this 

action, contact Douglas Anderson, 

Federal Aviation Administration, Office 

of the Regional Counsel, ANM–7, 

Northwest Mountain Region, 1601 Lind 

Avenue SW., Renton, WA 98057–3356; 

telephone: (425) 227–2166; email: 

douglas.anderson@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Good Cause 

The FAA finds that notice and public 

comment to this final rule are 

unnecessary, since this amendment is a 

conforming change in light of the 

rulemaking activity that led to AD 

2012–11–09.1 Interested parties have 

been offered an opportunity to comment 

on the issues covered by this SFAR, and 

the FAA has considered all comments. 

See Airworthiness Directive (AD) 2012– 

11–09; 77 FR 38000, June 26, 2012. 

Authority for This Rulemaking 

The FAA’s authority to issue rules on 

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; regulations and minimum 

standards in the interest of safety for 

inspecting, servicing, and overhauling 

aircraft; and regulations for other 

practices, methods, and procedures the 

Administrator finds necessary for safety 

in air commerce. This regulation is 

within the scope of that authority 

because it revises the safety standards 

for design and operation of transport 

category airplanes. 

I. Overview of Final Rule 

The FAA issued Special Federal 

Aviation Regulation (SFAR) 111 to 

address the noncompliance with the 

regulations created by compliance with 

AD 2011–04–09.2 Because no solution 

was available at that time that would 

both comply with the AD and provide 

oxygen to occupants of lavatories, the 

SFAR was intended to be in effect until 

superseded by further action. 

As discussed in the preambles to the 

notice of proposed rulemaking (NPRM) 3

and final rule adopting AD 2012–11–09, 

the FAA chartered an Aviation 

Rulemaking Committee (ARC) to 

identify methods of restoring oxygen in 

lavatories without creating security 

vulnerabilities. The FAA is in the 

process of developing rulemaking to 

adopt new standards for chemical 

oxygen generator system installations, 

based on the ARC recommendations, 

and has issued Policy Statement PS– 

ANM–25–04, Chemical Oxygen 

Generator Installations. Applicants may 

use the guidance in that policy 

statement for approval of chemical 

oxygen generator systems. Further, the 

FAA has issued AD 2012–11–09, which 

mandates installation of a supplemental 

oxygen system in all airplanes affected 

by AD 2011–04–09. 

The FAA is now establishing an 

expiration date for SFAR 111 that 

coincides with the compliance date of 

AD 2012–11–09. While we fully expect 

that the compliance time specified in 

the AD is sufficient to enable all affected 

operators to comply within that time, it 

is possible there will be circumstances 

beyond an operator’s control under 

which the operator’s compliance will be 

delayed. If the delay is adequately 

justified, per § 39.19, the FAA may 

approve an alternative method of 

compliance (AMOC) or extension of 

compliance time. To avoid having to 

initiate additional rulemaking or to 

grant a separate exemption from the 

regulations referenced in SFAR 111, 

paragraph (e) would allow for an 

extension of the expiration of the SFAR 

corresponding to the duration of any 

such extension of compliance time. 

Provisions of SFAR 111 

The applicability of the SFAR has 

been amended to conform to AD 2012– 

11–09. The amended SFAR applies to 

persons required to comply with AD 

2012–11–09, but only for airplanes on 

which the actions required by the AD 

have not yet been accomplished. The 

effect of this limitation is that, once 

those actions are accomplished on an 

airplane, it is no longer eligible for the 

relief or subject to the requirements 

provided by this SFAR, and the operator 


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is again required to comply with the 

applicable rules specified in paragraph 

(b) of the SFAR. 

Until compliance with AD 2012–11– 

09 is accomplished, the amended SFAR 

allows all air carriers that were required 

to comply with AD 2011–04–09 to 

continue to operate without complying 

with specific regulations pertaining to 

supplemental oxygen systems. The 

amended SFAR also permits 

manufacturers and modifiers of 

transport category airplanes to deliver or 

return to service airplanes affected by 

the FAA directive with the same relief. 

In addition, the amended SFAR requires 

certain procedural and configuration 

enhancements to reduce the safety risk 

to passengers in the unlikely event that 

they should need oxygen while in a 

lavatory. Paragraph (c) of the amended 

SFAR requires that when a person 

described in paragraph (a) of this 

section has modified airplanes as 

required by Airworthiness Directive 

2011–04–09, the affected airplanes must 

be returned to service with a note in the 

airplane maintenance records that the 

modification was done under the 

provisions of this SFAR. 

Paragraph (h) of AD 2011–04–09 also 

contains a provision for regulatory relief 

that is in effect until superseded by 

other rulemaking. AD 2012–11–09 

superseded AD 2011–04–09 and 

contains a similar provision for 

superseding future rulemaking to allow 

for the progressive retrofit of the 

affected fleet. As such, the amended 

SFAR is only needed to allow for 

deliveries, modifications and other 

entries into service that might otherwise 

not be allowed due to noncompliance 

with supplemental oxygen 

requirements, until the compliance date 

of AD 2012–11–09. 

II. Background 

On March 8, 2011, the FAA published 

an interim final rule, request for 

comments (Amendment Nos. 21–94, 25– 

133, 121–354, 129–50; SFAR 111), on 

security considerations for lavatory 

oxygen systems in the Federal Register 

(76 FR 12550). The FAA had become 

aware of security vulnerability with 

certain types of oxygen systems 

installed inside the lavatories of most 

transport category airplanes. As a result, 

the FAA mandated that these oxygen 

systems be rendered inoperative until 

the vulnerability could be eliminated. 

However, by rendering the oxygen 

systems inoperative to comply with that 

mandatory action, operators were out of 

compliance with the requirements of 

Title 14, Code of Federal Regulations 

(14 CFR) 25.1447, 121.329, and 121.333. 

In addition to the fleet of in-service 

airplanes, newly manufactured 

airplanes and airplanes undergoing 

other modification also needed to 

render the oxygen systems in the 

lavatories inoperative. SFAR 111 was 

needed so the affected airplanes could 

continue operating until the issue was 

resolved. 

The FAA then chartered an Aviation 

Rulemaking Committee (ARC) to make 

recommendations regarding new 

standards for the oxygen system 

installation, as well as how to 

implement those standards. The ARC 

submitted its recommendations to the 

FAA, and the FAA intends to use those 

recommendations as the basis for new 

standards and new installation 

approvals. 

III. Discussion of Public Comments and 

Final Rule 

The FAA received comments from ten 

commenters regarding SFAR 111. Those 

commenters were: Aerox Aviation 

Oxygen Systems, Inc., The Boeing 

Company, and eight individual 

commenters. The FAA’s disposition of 

those comments was published in the 

Federal Register on February 27, 2012 

(77 FR 11385.) The FAA determined 

that no revisions to SFAR 111 were 

necessary based off comments received. 

IV. Regulatory Notices and Analyses 

A. Regulatory Evaluation 

Changes to Federal regulations must 

undergo several economic analyses. 

First, Executive Order 12866 and 

Executive Order 13563 direct 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 (Pub. L. 96–354) requires 

agencies to analyze the economic 

impact of regulatory changes on small 

entities. Third, the Trade Agreements 

Act (Pub. L. 96–39) prohibits agencies 

from setting standards that create 

unnecessary obstacles to the foreign 

commerce of the United States. In 

developing U.S. standards, the Trade 

Act requires agencies to consider 

international standards and, where 

appropriate, that they 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 with base year of 1995). 

This portion of the preamble 

summarizes the FAA’s analysis of the 

economic impacts of this final rule. 

Department of Transportation Order 

DOT 2100.5 prescribes policies and 

procedures for simplification, analysis, 

and review of regulations. If the 

expected cost impact is so minimal that 

a proposed or final rule does not 

warrant a full evaluation, this order 

permits that a statement to that effect 

and the basis for it to 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 final rule. The reasoning for this 

determination follows: 

This final rule adds an expiration date 

to SFAR 111 that coincides with the 

compliance date for AD 2012–11–09. 

The FAA has, therefore, determined 

that this final rule 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. 

B. Regulatory Flexibility Determination 

The Regulatory Flexibility Act of 1980 

(Pub. L. 96–354) (RFA) establishes ‘‘as a 

principle of regulatory issuance that 

agencies shall endeavor, consistent with 

the objectives of the rule and of 

applicable statutes, to fit regulatory and 

informational requirements to the scale 

of the businesses, organizations, and 

governmental jurisdictions subject to 

regulation.’’ To achieve this principle, 

agencies are required to solicit and 

consider flexible regulatory proposals 

and to explain the rationale for their 

actions to assure that such proposals are 

given serious consideration.’’ The RFA 

covers a wide-range of small entities, 

including small businesses, not-forprofit organizations, and small 

governmental jurisdictions. 

Agencies must perform a review to 

determine whether a 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 rule is not expected to have a 

significant economic impact on a 

substantial number of small entities, 

section 605(b) of the RFA provides that 

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. 

The costs to small airline operators to 

install lavatory oxygen generating 


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systems have been addressed in the 

economic analysis associated with the 

rulemaking for AD–2012–11–09. This 

final rule ensures that the expiration 

date of SFAR 111 will coincide with the 

compliance date of AD–2012–11–09, but 

also allows for an extension of 

compliance time if the delay is 

adequately justified. 

Therefore as the FAA Acting 

Administrator, I certify that this rule 

will not have a significant economic 

impact on a substantial number of small 

entities. 

C. International Trade Impact 

Assessment 

The Trade Agreements Act of 1979 

(Pub. L. 96–39), as amended by the 

Uruguay Round Agreements Act (Pub. 

L. 103–465), prohibits Federal agencies 

from establishing standards or engaging 

in related activities that create 

unnecessary obstacles to the foreign 

commerce of the United States. 

Pursuant to these Acts, the 

establishment of standards is not 

considered an unnecessary obstacle to 

the foreign commerce of the United 

States, so long as the standard has a 

legitimate domestic objective, such as 

the protection of safety, and does not 

operate in a manner that excludes 

imports that meet this objective. The 

statute also requires consideration of 

international standards and, where 

appropriate, that they be the basis for 

U.S. standards. The FAA has assessed 

the potential effect of this final rule and 

determined that it responds to a 

domestic safety objective and is not 

considered an unnecessary obstacle to 

international trade. 

D. Unfunded Mandates Assessment 

Title II of the Unfunded Mandates 

Reform Act of 1995 (Pub. L. 104–4) 

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 (in 

1995 dollars) in any one year by State, 

local, and tribal governments, in the 

aggregate, or by the private sector; such 

a mandate is deemed to be a ‘‘significant 

regulatory action.’’ The FAA currently 

uses an inflation-adjusted value of 

$143.1 million in lieu of $100 million. 

This final rule does not contain such a 

mandate; therefore, the requirements of 

Title II of the Act do not apply. 

E. Paperwork Reduction Act 

The Paperwork Reduction Act of 1995 

(44 U.S.C. 3507(d)) requires that the 

FAA consider the impact of paperwork 

and other information collection 

burdens imposed on the public. The 

FAA has determined that there is no 

new requirement for information 

collection associated with this final 

rule. 

F. International Compatibility and 

Cooperation 

In keeping with U.S. obligations 

under the Convention on International 

Civil Aviation, it is FAA policy to 

conform to International Civil Aviation 

Organization (ICAO) Standards and 

Recommended Practices to the 

maximum extent practicable. The FAA 

has reviewed the corresponding ICAO 

Standards and Recommended Practices 

and has identified no differences with 

these regulations. 

Executive Order 13609, Promoting 

International Regulatory Cooperation, 

promotes international regulatory 

cooperation to meet shared challenges 

involving health, safety, labor, security, 

environmental, and other issues and to 

reduce, eliminate, or prevent 

unnecessary differences in regulatory 

requirements. The FAA has analyzed 

this action under the policies and 

agency responsibilities of Executive 

Order 13609, and has determined that 

this action would have no effect on 

international regulatory cooperation. 

G. Environmental Analysis 

FAA Order 1050.1E identifies FAA 

actions that are categorically excluded 

from preparation of an environmental 

assessment or environmental impact 

statement under the National 

Environmental Policy Act in the 

absence of extraordinary circumstances. 

The FAA has determined this 

rulemaking action qualifies for the 

categorical exclusion identified in 

paragraph 312f and involves no 

extraordinary circumstances. 

V. Executive Order Determinations 

A. Executive Order 13132, Federalism 

The FAA has analyzed this final rule 

under the principles and criteria of 

Executive Order 13132, Federalism. The 

agency determined that this action will 

not have a substantial direct effect on 

the States, or the relationship between 

the Federal Government and the States, 

or on the distribution of power and 

responsibilities among the various 

levels of government, and, therefore, 

does not have Federalism implications. 

B. Executive Order 13211, Regulations 

That Significantly Affect Energy Supply, 

Distribution, or Use 

The FAA analyzed this final rule 

under Executive Order 13211, Actions 

Concerning Regulations that 

Significantly Affect Energy Supply, 

Distribution, or Use (May 18, 2001). The 

agency has determined that it is not a 

‘‘significant energy action’’ under the 

executive order and it is not likely to 

have a significant adverse effect on the 

supply, distribution, or use of energy. 

VI. How To Obtain Additional 

Information 

A. Rulemaking Documents 

An electronic copy of a rulemaking 

document my be obtained by using the 

Internet— 

1. Search the Federal eRulemaking 

Portal (http://www.regulations.gov); 

2. Visit the FAA’s Regulations and 

Policies Web page at http:// 

www.faa.gov/regulations_policies/or 

3. Access the Government Printing 

Office’s Web page at http:// 

www.gpo.gov/fdsys/. 

Copies may also be obtained by 

sending a request (identified by 

amendment or docket number of this 

rulemaking) to the Federal Aviation 

Administration, Office of Rulemaking, 

ARM–1, 800 Independence Avenue 

SW., Washington, DC 20591, or by 

calling (202) 267–9680. 

B. Comments Submitted to the Docket 

Comments received may be viewed by 

going to http://www.regulations.gov and 

following the online instructions to 

search the docket number for this 

action. Anyone is able to search the 

electronic form of all comments 

received into any of the FAA’s 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.). 

C. 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. 

A small entity with questions regarding 

this document, may contact its local 

FAA official, or the person listed under 

the FOR FURTHER INFORMATION CONTACT

heading at the beginning of the 

preamble. To find out more about 

SBREFA on the Internet, visit http:// 

www.faa.gov/regulations_policies/ 

rulemaking/sbre_act/. 

List of Subjects in 14 CFR Part 121 

Air carriers, Aircraft, Airmen, 

Aviation safety, Charter flights, 

Reporting and recordkeeping 

requirements, Safety, Transportation. 

The Amendments 

In consideration of the foregoing, the 

Federal Aviation Administration 


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amends chapter I of Title 14, Code of 

Federal Regulations as follows: 

PART 121—OPERATING 

REQUIREMENTS: DOMESTIC, FLAG, 

AND SUPPLEMENTAL OPERATIONS 

■ 1. The authority citation for part 121 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 1153, 40113, 

40119, 41706, 44101, 44701–44702, 44705, 

44709–44711, 44713, 44716–44717, 44722, 

44901, 44903–44904, 44912, 46105. 

Subpart DD—Special Federal Aviation 

Regulations 

■ 2. Revise § 121.1500 to read as 

follows: 

§ 121.1500 SFAR No. 111—Lavatory 

Oxygen Systems. 

(a) Applicability. This SFAR applies 

to the following persons: 

(1) All operators of transport category 

airplanes that are required to comply 

with AD 2012–11–09, but only for 

airplanes on which the actions required 

by that AD have not been accomplished. 

(2) Applicants for airworthiness 

certificates. 

(3) Holders of production certificates. 

(4) Applicants for type certificates, 

including changes to type certificates. 

(b) Regulatory relief. Except as noted 

in paragraph (d) of this section and 

contrary provisions of 14 CFR part 21, 

and 14 CFR 25.1447, 119.51, 121.329, 

121.333 and 129.13, notwithstanding, 

for the duration of this SFAR: 

(1) A person described in paragraph 

(a) of this section may conduct flight 

operations and add airplanes to 

operations specifications with disabled 

lavatory oxygen systems, modified in 

accordance with FAA Airworthiness 

Directive 2011–04–09, subject to the 

following limitations: 

(i) This relief is limited to regulatory 

compliance of lavatory oxygen systems. 

(ii) Within 30 days of March 29, 2013, 

all oxygen masks must be removed from 

affected lavatories, and the mask 

stowage location must be reclosed. 

(iii) Within 60 days of March 29, 2013 

each affected operator must verify that 

crew emergency procedures specifically 

include a visual check of the lavatory as 

a priority when checking the cabin 

following any event where oxygen 

masks were deployed in the cabin. 

(2) An applicant for an airworthiness 

certificate may obtain an airworthiness 

certificate for airplanes to be operated 

by a person described in paragraph (a) 

of this section, although the airplane 

lavatory oxygen system is disabled. 

(3) A holder of a production 

certificate may apply for an 

airworthiness certificate or approval for 

airplanes to be operated by a person 

described in paragraph (a) of this 

section. 

(4) An applicant for a type certificate 

or change to a type certificate may 

obtain a design approval without 

showing compliance with 

§ 25.1447(c)(1) of this chapter for 

lavatory oxygen systems, in accordance 

with this SFAR. 

(5) Each person covered by paragraph 

(a) of this section may inform 

passengers that the lavatories are not 

equipped with supplemental oxygen. 

(c) Return to service documentation. 

When a person described in paragraph 

(a) of this section has modified airplanes 

as required by Airworthiness Directive 

2011–04–09, the affected airplanes must 

be returned to service with a note in the 

airplane maintenance records that the 

modification was done under the 

provisions of this SFAR. 

(d) Expiration. This SFAR expires on 

September 10, 2015, except this SFAR 

will continue to apply to any airplane 

for which the FAA approves an 

extension of the AD compliance time for 

the duration of the extension. 

Issued in Washington, DC, on January 18, 

2013. 

Michael P. Huerta, 

Administrator. 

[FR Doc. 2013–01695 Filed 1–25–13; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2012–1293; Directorate 

Identifier 2012–NE–45–AD; Amendment 39– 

17327; AD 2013–02–06] 

RIN 2120–AA64 

Airworthiness Directives; Engine 

Alliance Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule; request for 

comments. 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for all 

Engine Alliance GP7270 and GP7277 

turbofan engines. This AD requires 

initial and repetitive borescope 

inspections and removal from service 

before further flight if one or more burn 

holes are detected, in certain highpressure turbine (HPT) stage 2 nozzles. 

This AD also requires mandatory 

removal from service of these HPT stage 

2 nozzles at the next engine shop visit. 

This AD was prompted by a report 

received of inadequate cooling of the 

HPT stage 2 nozzle, leading to damage 

to the HPT stage 2 nozzle, burn-through 

of the turbine case, and engine 

shutdown. We are issuing this AD to 

prevent HPT stage 2 nozzle failure, 

leading to uncontrolled fire, engine 

shutdown, and damage to the airplane. 

DATES: This AD is effective February 12, 

2013. 

We must receive comments on this 

AD by March 14, 2013. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

http://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: 202–493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE., 

Washington, DC 20590. 

• Hand Delivery: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE., 

Washington, DC 20590, between 9 a.m. 

and 5 p.m., Monday through Friday, 

except Federal holidays. 

Examining the AD Docket 

You may examine the AD docket on 

the Internet at http:// 

www.regulations.gov; or in person at the 

Docket Management Facility between 9 

a.m. and 5 p.m., Monday through 

Friday, except Federal holidays. The AD 

docket contains this AD, the regulatory 

evaluation, any comments received, and 

other information. The street address for 

the Docket Office (phone: 800–647– 

5527) is in the ADDRESSES section. 

Comments will be available in the AD 

docket shortly after receipt. 

FOR FURTHER INFORMATION CONTACT: 

Martin Adler, Aerospace Engineer, 

Engine & Propeller Directorate, FAA, 12 

New England Executive Park, 

Burlington, MA 01803; phone: 781– 

238–7157; fax: 781–238–7199; email: 

martin.adler@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

We received a report of an engine 

shutdown and turbine case burnthrough, preceded by exceedance of the 

engine exhaust gas temperature (EGT) 

limit and loss of engine oil. 

Investigation revealed that the event 

was caused by damage to the HPT stage 

2 nozzle due to inadequate part cooling. 

HPT stage 2 nozzles, part numbers (P/ 

Ns) 2101M24G01, 2101M24G02, and 

2101M24G03, are identified as having 


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