Federal Register / Vol. 77, No. 106 / Friday, June 1, 2012 / Proposed Rules 32437 

burden should be directed to the FAA at: 800 

Independence Ave. SW., Washington, DC 

20591, Attn: Information Collection 

Clearance Officer, AES–200. 

(l) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, Seattle Certification 

Office (ACO), FAA, has the authority to 

approve AMOCs for this AD, if requested 

using the procedures found in 14 CFR 39.19. 

In accordance with 14 CFR 39.19, send your 

request to your principal inspector or local 

Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the ACO, send it to the 

attention of the person identified in the 

Related Information section of this AD. 

Information may be emailed to 9-ANMSeattle-ACO-AMOC-Requests@faa.gov. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the local flight standards district office/ 

certificate holding district office. 

(3) An AMOC that provides an acceptable 

level of safety may be used for any repair 

required by this AD if it is approved by the 

Boeing Commercial Airplanes Organization 

Designation Authorization (ODA) that has 

been authorized by the Manager, Seattle ACO 

to make those findings. For a repair method 

to be approved, the repair must meet the 

certification basis of the airplane and the 

approval must specifically refer to this AD. 

(m) Related Information 

(1) For more information about this AD, 

contact Nancy Marsh, Aerospace Engineer, 

Airframe Branch, ANM–120S, Seattle 

Aircraft Certification Office (ACO), FAA, 

1601 Lind Avenue SW., Renton, Washington 

98057–3356; phone: 425–917–6440; fax: 425– 

917–6590; email: Nancy.Marsh@faa.gov. 

(2) For service information identified in 

this AD, contact Boeing Commercial 

Airplanes, Attention: Data & Services 

Management, P.O. Box 3707, MC 2H–65, 

Seattle, Washington 98124–2207; phone: 

206–544–5000, extension 1; fax: 206–766– 

5680; email: me.boecom@boeing.com; 

Internet: https://www.myboeingfleet.com. 

You may review copies of the referenced 

service information at the FAA, Transport 

Airplane Directorate, 1601 Lind Avenue SW., 

Renton, Washington. For information on the 

availability of this material at the FAA, call 

425–227–1221. 

Issued in Renton, Washington, on May 18, 

2012. 

Michael Kaszycki, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2012–13055 Filed 5–31–12; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2011–0115; Directorate 

Identifier 2010–NE–40–AD] 

RIN 2120–AA64 

Airworthiness Directives; Turbomeca 

S.A. Turboshaft Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to supersede an 

existing airworthiness directive (AD) 

that applies to certain Turbomeca S.A. 

Arriel 2B and 2B1 turboshaft engines. 

The existing AD currently requires 

accomplishment of the TU166 

modification. Since we issued that AD, 

we became aware of an accident 

involving an engine in-flight shutdown 

on a twin-engine helicopter powered by 

two Arriel 2S2 engines. This proposed 

AD would add the Arriel 2S2 engine to 

the applicability of engines requiring 

the TU166 modification with a different 

compliance time. We are proposing this 

AD to prevent rupture of a gas generator 

(GG) turbine blade, which could result 

in an uncommanded in-flight shutdown 

and a forced landing or accident. 

DATES: We must receive comments on 

this proposed AD by July 31, 2012. 

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: Deliver to Mail 

address above between 9 a.m. and 

5 p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in 

this AD, contact Turbomeca, 40220 

Tarnos, France; phone: 33 (0)5 59 74 40 

00; telex: 570 042; fax: 33 (0)5 59 74 45 

15. You may review copies of the 

referenced service information at the 

FAA, Engine & Propeller Directorate, 12 

New England Executive Park, 

Burlington, MA. For information on the 

availability of this material at the FAA, 

call 781–238–7125. 

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 proposed 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: Rose 

Len, Aerospace Engineer, Engine 

Certification Office, FAA, Engine & 

Propeller Directorate, 12 New England 

Executive Park, Burlington, MA 01803; 

phone: 781–238–7772; fax: 781–238– 

7199; email: rose.len@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written 

relevant data, views, or arguments about 

this proposed AD. Send your comments 

to an address listed under the 

ADDRESSES section. Include ‘‘Docket No. 

FAA–2011–0115; Directorate Identifier 

2010–NE–40–AD’’ at the beginning of 

your comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of this proposed AD. We will 

consider all comments received by the 

closing date and may amend this 

proposed AD because of those 

comments. 

We will post all comments we 

receive, without change, to http:// 

www.regulations.gov, including any 

personal information you provide. We 

will also post a report summarizing each 

substantive verbal contact we receive 

about this proposed AD. 

Discussion 

On June 14, 2011, we issued AD 

2011–13–05, Amendment 39–16728 (76 

FR 40222, July 8, 2011) for Turbomeca 

S.A. Arriel 2B and 2B1 turboshaft 

engines not modified by the TU166 

modification. That AD requires 

accomplishment of the TU166 

modification when the GG turbine is 

replaced or when the engine or Module 

M03 is going through overhaul or repair, 

or within 1,300 cycles-in-service after 

the effective date of that AD, whichever 

occurs first. That AD resulted from 

several cases of GG turbine blade 

rupture occurring in service on Arriel 2 

twin-engine powered helicopters, and 

one case on a single-engine powered 

helicopter. We issued that AD to 

prevent rupture of a GG turbine blade, 

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32438 Federal Register / Vol. 77, No. 106 / Friday, June 1, 2012 / Proposed Rules 

which could result in an uncommanded 

in-flight shutdown and an emergency 

autorotation landing or accident on 

single-engine powered helicopters. 

Actions Since Existing AD Was Issued 

Since we issued AD 2011–13–05, 

Amendment 39–16728 (76 FR 40222, 

July 8, 2011), an accident occurred on 

a Sikorsky S–76C++ twin-engine 

helicopter following an uncommanded 

in-flight shutdown of one of its Arriel 

2S2 turboshaft engines. That engine did 

not have the TU166 modification 

incorporated. The European Aviation 

Safety Agency (EASA), which is the 

Technical Agent for the Member States 

of the European Community, has 

superseded EASA AD 2010–0198, dated 

October 1, 2010, which we reference in 

AD 2011–13–05. The EASA superseding 

AD, AD 2012–0054, dated April 2, 2012, 

adds the Arriel 2S2 turboshaft engine to 

the applicability for incorporating the 

TU166 modification with its own 

compliance time. This AD adds the 

Arriel 2S2 engine with a compliance 

time different than the Arriel 2B and 

2B1 engines. 

Relevant Service Information 

We reviewed Turbomeca S.A. Alert 

Mandatory Service Bulletin (MSB) No. 

A292 72 3166 Version B, dated 

September 20, 2010, and Alert MSB No. 

A292 72 4166 Version A, dated March 

23, 2012. The Alert MSBs describe 

procedures for accomplishing the 

TU166 modification. 

FAA’s Determination 

We are proposing this AD because we 

evaluated all the relevant information 

and determined the unsafe condition 

described previously is likely to exist or 

develop in other products of the same 

type design. 

Proposed AD Requirements 

This proposed AD would retain all of 

the requirements of AD 2011–13–05, 

Amendment 39–16728 (76 FR 40222, 

July 8, 2011) except it would reduce the 

compliance time for the Arriel 2B and 

2B1 engines to account for the effective 

date of that AD. This proposed AD 

would add the Arriel 2S2 turboshaft 

engine to the AD applicability and 

would add accomplishing the TU166 

modification to those engines with a 

compliance time different from the 

compliance time for the Arriel 2B and 

2B1 engines. 

Costs of Compliance 

Based on the service information, we 

estimate that this proposed AD would 

affect about 542 products of U.S. 

registry. We also estimate that it would 

take about 60 work-hours per product to 

comply with this AD. The average labor 

rate is $85 per work-hour. Required 

parts would cost about $3,900 per 

product. Based on these figures, we 

estimate the cost of the AD on U.S. 

operators to be $4,878,000. 

Authority for This Rulemaking 

Title 49 of the United States Code 

specifies the FAA’s authority to issue 

rules on aviation safety. 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. 

We are issuing this rulemaking under 

the authority described in Subtitle VII, 

Part A, Subpart III, Section 44701, 

‘‘General requirements.’’ Under that 

section, Congress charges the FAA with 

promoting safe flight of civil aircraft in 

air commerce by prescribing regulations 

for practices, methods, and procedures 

the Administrator finds necessary for 

safety in air commerce. This regulation 

is within the scope of that authority 

because it addresses an unsafe condition 

that is likely to exist or develop on 

products identified in this rulemaking 

action. 

Regulatory Findings 

We have determined that this 

proposed AD would not have federalism 

implications under Executive Order 

13132. This proposed AD would not 

have a substantial direct effect on the 

States, on the relationship between the 

national Government and the States, or 

on the distribution of power and 

responsibilities among the various 

levels of government. 

For the reasons discussed above, I 

certify that the proposed regulation: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Is not a ‘‘significant rule’’ under 

the DOT Regulatory Policies and 

Procedures (44 FR 11034, February 26, 

1979), 

(3) Will not affect intrastate aviation 

in Alaska, and 

(4) Will not have a significant 

economic impact, positive or negative, 

on a substantial number of small entities 

under the criteria of the Regulatory 

Flexibility Act. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA proposes to amend 14 CFR part 

39 as follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

2. The FAA amends § 39.13 by 

removing airworthiness directive (AD) 

2011–13–05, Amendment 39–16728 (76 

FR 40222, July 8, 2011), and adding the 

following new AD: 

Turbomeca S.A.: Docket No. FAA–2011– 

0115; Directorate Identifier 2010–NE– 

40–AD. 

(a) Comments Due Date 

The FAA must receive comments on this 

AD action by July 31, 2012. 

(b) Affected ADs 

This AD supersedes AD 2011–13–05, 

Amendment 39–16728 (76 FR 40222, July 8, 

2011). 

(c) Applicability 

This AD applies to Turbomeca S.A. Arriel 

2B, 2B1, and 2S2 turboshaft engines not 

modified by TU166 modification. 

(d) Unsafe Condition 

This AD was prompted by reports of an 

accident involving a twin-engine helicopter 

powered by two Arriel 2S2 engines. We are 

issuing this AD to prevent rupture of a gas 

generator (GG) turbine blade, which could 

result in an uncommanded in-flight 

shutdown and a forced landing or accident. 

(e) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(1) For Arriel 2B and 2B1 turboshaft 

engines, accomplish the TU166 modification 

in accordance with the instructions specified 

within Turbomeca Alert Mandatory Service 

Bulletin (MSB) No. A292 72 3166 Version B, 

dated September 20, 2010, when the GG 

Turbine is replaced or when the engine or 

Module M03 is going through overhaul or 

repair, or within 676 cycles-in-service (CIS) 

after the effective date of this AD, whichever 

occurs first. 

(2) For Arriel 2S2 turboshaft engines, 

accomplish the TU166 modification in 

accordance with the instructions specified 

within Turbomeca Alert MSB No. A292 72 

4166 Version A, dated March 23, 2012, when 

the GG Turbine is replaced or when the 

engine or Module M03 is going through 

overhaul or repair, or within 500 CIS after the 

effective date of this AD, whichever occurs 

first. 

(f) Credit for Previous Actions 

For Arriel 2B and 2B1 turboshaft engines, 

if before the effective date of this AD, you 

performed the TU166 modification using 

Turbomeca Alert MSB No. A292 72 3166 

Version A, dated August 17, 2010, you met 

the requirements of this AD. 

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Federal Register / Vol. 77, No. 106 / Friday, June 1, 2012 / Proposed Rules 32439 

(g) Alternative Methods of Compliance 

(AMOCs) 

The Manager, Engine Certification Office, 

may approve AMOCs for this AD. Use the 

procedures found in 14 CFR 39.19 to make 

your request. 

(h) Related Information 

(1) For more information about this AD, 

contact Rose Len, Aerospace Engineer, 

Engine Certification Office, FAA, Engine & 

Propeller Directorate, 12 New England 

Executive Park, Burlington, MA 01803; 

phone: 781–238–7772; fax: 781–238–7199; 

email: rose.len@faa.gov. 

(2) European Aviation Safety Agency AD 

2012–0054, dated April 2, 2012, also pertains 

to this AD. 

(3) For service information identified in 

this AD, contact Turbomeca, 40220 Tarnos, 

France; phone: 33 (0)5 59 74 40 00; telex: 570 

042; fax: 33 (0)5 59 74 45 15. You may review 

copies of the referenced service information 

at the FAA, Engine & Propeller Directorate, 

12 New England Executive Park, Burlington, 

MA. You may review copies of the referenced 

service information at the FAA, Engine & 

Propeller Directorate, 12 New England 

Executive Park, Burlington, MA. For 

information on the availability of this 

material at the FAA, call 781–238–7125. 

Issued in Burlington, Massachusetts, on 

May 25, 2012. 

Pete A. White, 

Manager, Engine & Propeller Directorate, 

Aircraft Certification Service. 

[FR Doc. 2012–13324 Filed 5–31–12; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2012–0496; Directorate 

Identifier 2011–NM–263–AD] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier 

Inc. Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to supersede an 

existing airworthiness directive (AD) 

that applies to certain Bombardier, Inc. 

Model CL–600–2B19 (Regional Jet 

Series 100 & 440) airplanes. The existing 

AD currently requires revising the 

airworthiness limitations section (AWL) 

of the instructions for continued 

airworthiness (ICA) of the Canadair 

Regional Jet Maintenance Requirements 

Manual by incorporating new 

procedures for repetitive detailed and 

special detailed inspections for cracking 

of the aft pressure bulkhead. Since we 

issued that AD, we have received 

multiple reports of cracks on the 

forward face of the rear pressure 

bulkhead (RPB) web. This proposed AD 

would require revising the maintenance 

program to incorporate a revised task 

specified in a certain temporary 

revision, which requires an improved 

non-destructive inspection procedure; 

and adds airplanes to the applicability. 

We are proposing this AD to detect and 

correct cracking in the RPB, which 

could result in reduced structural 

integrity and rapid decompression of 

the airplane. 

DATES: We must receive comments on 

this proposed AD by July 16, 2012. 

ADDRESSES: You may send comments 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, between 9 

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

Friday, except Federal holidays. 

For service information identified in 

this proposed AD, contact Bombardier, 

Inc., 400 Coˆte-Vertu Road West, Dorval, 

Que ́bec H4S 1Y9, Canada; telephone 

514–855–5000; fax 514–855–7401; email 

thd.crj@aero.bombardier.com; Internet 

http://www.bombardier.com. You may 

review copies of the referenced service 

information at the FAA, Transport 

Airplane Directorate, 1601 Lind Avenue 

SW., Renton, Washington. For 

information on the availability of this 

material at the FAA, call 425–227–1221. 

Examining the AD Docket 

You may examine the AD docket on 

the Internet at http:// 

www.regulations.gov; or in person at the 

Docket Operations office between 9 a.m. 

and 5 p.m., Monday through Friday, 

except Federal holidays. The AD docket 

contains this proposed AD, the 

regulatory evaluation, any comments 

received, and other information. The 

street address for the Docket Operations 

office (telephone (800) 647–5527) is in 

the ADDRESSES section. Comments will 

be available in the AD docket shortly 

after receipt. 

FOR FURTHER INFORMATION CONTACT: 

Jeffrey Zimmer, Aerospace Engineer, 

Airframe & Mechanical Systems Branch, 

ANE–171, New York Aircraft 

Certification Office (ACO), FAA, 1600 

Stewart Avenue, Suite 410, Westbury, 

New York 11590; telephone (516) 228– 

7306; fax (516) 794–5531. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written 

relevant data, views, or arguments about 

this proposed AD. Send your comments 

to an address listed under the 

ADDRESSES section. Include ‘‘Docket No. 

FAA–2012–0496; Directorate Identifier 

2011–NM–263–AD’’ at the beginning of 

your comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of this proposed AD. We will 

consider all comments received by the 

closing date and may amend this 

proposed AD based on those comments. 

We will post all comments we 

receive, without change, to http:// 

www.regulations.gov, including any 

personal information you provide. We 

will also post a report summarizing each 

substantive verbal contact we receive 

about this proposed AD. 

Discussion 

On October 31, 2005, we issued AD 

2005–23–01, Amendment 39–14359 (70 

FR 69073, November 14, 2005). That AD 

required actions intended to address an 

unsafe condition on the products listed 

above. Since we issued AD 2005–23–01, 

Transport Canada Civil Aviation 

(TCCA), which is the aviation authority 

for Canada, has issued Canadian 

Airworthiness Directive CF–2011–30, 

dated August 11, 2011 (referred to after 

this as ‘‘the MCAI’’), to correct an unsafe 

condition for the specified products. 

The MCAI states: 

Cracks on the forward face of the Rear 

Pressure Bulkhead (RPB) web have been 

discovered on three CL–600–2B19 aeroplanes 

in-service. This indicates that the existing 

inspection requirements of Airworthiness 

Limitation (AWL) task 53–61–153 mandated 

by [TCCA] AD CF–2005–13R1 are not 

adequate. Failure of the RPB could result in 

rapid decompression of the aeroplane. 

A Temporary Revision has been made to 

Part 2 of the Maintenance Requirements 

Manual (MRM) to revise the existing AWL 

task by introducing an improved NonDestructive Inspection (NDI) procedure to 

ensure that fatigue cracking of the RPB is 

detected and corrected. 

This [TCCA] directive mandates the 

incorporation of a new NDI procedure for 

AWL task number 53–61–153. 

You may obtain further information 

by examining the MCAI in the AD 

docket. 

Relevant Service Information 

Bombardier Inc. has issued 

Temporary Revision 2B–2187, dated 

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