66200 Federal Register / Vol. 76, No. 207 / Wednesday, October 26, 2011 / Proposed Rules 

both dated February 1, 2011, no further 

action is required by this paragraph. 

Parts Installation 

(h) For all airplanes: As of the effective 

date of this AD, no person may install an 

oxygen pressure regulator (P/N 806370–06) 

having any serial number listed in Table 2 of 

the Accomplishment Instructions of 

Bombardier Service Bulletin 700–35–011 (for 

Model BD–700–1A10 airplanes) or 700– 

1A11–35–010 (for Model BD–700–1A11 

airplanes), both Revision 01, both dated 

February 1, 2011, on any airplane, unless a 

suffix ‘‘-A’’ is beside the serial number. 

FAA AD Differences 

Note 1: This AD differs from the MCAI 

and/or service information as follows: 

The MCAI applicability specifies only 

airplanes having certain serial numbers and 

prohibits installation of the affected part on 

those airplanes. Because the affected part 

could be rotated onto any of the Model BD– 

700–1A10 and BD–700–1A11 airplanes, this 

AD applies to S/N 9002 through 9126 

inclusive, 9128 through 9312 inclusive, 9314 

through 9322 inclusive, 9324 through 9335 

inclusive, 9337, 9338, 9340, 9341, 9343, 

9344, 9346, 9347, 9350, 9353, 9355, 9356, 

9358, 9361, 9365, 9372, 9374, 9384, 9402, 

9403, and subsequent. This has been 

coordinated with the Transport Canada Civil 

Aviation (TCCA). 

Other FAA AD Provisions 

(i) The following provisions also apply to 

this AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, New York Aircraft 

Certification Office (ACO), ANE–170, 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 ACO, send it to Attn: Program 

Manager, Continuing Operational Safety, 

FAA, New York ACO, 1600 Stewart Avenue, 

Suite 410, Westbury, New York 11590; 

telephone 516–228–7300; fax 516–794–5531. 

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. The AMOC 

approval letter must specifically reference 

this AD. 

(2) Airworthy Product: For any requirement 

in this AD to obtain corrective actions from 

a manufacturer or other source, use these 

actions if they are FAA-approved. Corrective 

actions are considered FAA-approved if they 

are approved by the State of Design Authority 

(or their delegated agent). You are required 

to assure the product is airworthy before it 

is returned to service. 

Related Information 

(j) Refer to MCAI Transport Canada Civil 

Aviation (TCCA) Airworthiness Directive 

CF–2011–10, dated May 13, 2011; 

Bombardier Service Bulletin 700–35–011, 

Revision 01, dated February 1, 2011; and 

Bombardier Service Bulletin 700–1A11–35– 

010, Revision 01, dated February 1, 2011; for 

related information. 

Issued in Renton, Washington, on October 

17, 2011. 

Kalene C. Yanamura, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2011–27650 Filed 10–25–11; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2011–1094; Directorate 

Identifier 2011–NM–070–AD] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to adopt a new 

airworthiness directive (AD) for certain 

The Boeing Company Model 757 

airplanes. This proposed AD would 

require inspecting for discrepancies and 

insufficient coverage of the secondary 

fuel barrier, determining the thickness 

of the secondary fuel barrier, and 

corrective actions if necessary. This 

proposed AD was prompted by reports 

that inspections of the wing center 

section revealed defective, misapplied, 

or missing secondary fuel vapor barrier 

on the center fuel tank. We are 

proposing this AD to detect and correct 

defective surfaces and insufficient 

thickness of secondary fuel barrier, 

which could allow fuel leaks or fumes 

into the pressurized cabin, and allow 

fuel or fuel vapors to come in contact 

with an ignition source, which could 

result in a fire or an explosion. 

DATES: We must receive comments on 

this proposed AD by December 12, 

2011. 

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: 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 proposed AD, contact Boeing 

Commercial Airplanes, Attention: Data 

& Services Management, P.O. Box 3707, 

MC 2H–65, Seattle, Washington 98124– 

2207; telephone 206–544–5000, 

extension 1; fax 206–766–5680; e-mail 

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. 

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: 

Kevin Nguyen, Aerospace Engineer, 

Propulsion Branch, ANM–140S, FAA, 

Seattle Aircraft Certification Office 

(ACO), 1601 Lind Avenue, SW., Renton, 

Washington 98057–3356; phone: 425– 

917–6501; fax: 425–917–6590; e-mail: 

kevin.nguyen@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written 

relevant data, views, or arguments about 

this proposal. Send your comments to 

an address listed under the ADDRESSES

section. Include ‘‘Docket No. FAA– 

2011–1094; Directorate Identifier 2011– 

NM–070–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 

We received reports that inspections 

of the wing center section revealed 


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Federal Register / Vol. 76, No. 207 / Wednesday, October 26, 2011 / Proposed Rules 66201 

defective, misapplied, or missing 

secondary fuel vapor barrier on the 

center fuel tank. The secondary fuel 

barrier is applied external to the fuel 

tank walls, which are subject to cabin 

pressure to provide a secondary means 

to contain fuel and fuel vapors. When 

the secondary fuel barrier is applied 

satisfactorily, it protects the pressurized 

cabin areas from fuel leaks and fumes. 

If the secondary fuel barrier is defective, 

fuel or fumes can leak through fastener 

holes or cracks in the structure and pass 

into the passenger compartment. There 

have been no reports from operators of 

fuel leaks or fumes in the passenger 

compartment. We are proposing this AD 

to detect and correct defective surfaces 

and insufficient thickness of secondary 

fuel barrier, which could allow fuel 

leaks or fumes into the pressurized 

cabin, and allow fuel or fuel vapors to 

come in contact with an ignition source, 

which could result in a fire or an 

explosion. 

Related Rulemaking 

On June 10, 2005, the FAA issued AD 

2005–13–15, Amendment 39–14152 (70 

FR 36486, June 24, 2005), applicable to 

certain Boeing Model 737–200, –200C, 

–300, –400, –500, –600, –700, –700C, 

–800, and –900 series airplanes, which 

requires a one-time detailed inspection 

for discrepancies of the secondary fuel 

vapor barrier of the wing center section, 

and related investigative and corrective 

actions if necessary. That AD was 

prompted by reports that the secondary 

fuel vapor barrier was not applied 

correctly to, or was missing from, 

certain areas of the wing center section. 

The actions required by that AD are 

intended to prevent fuel or fuel vapors 

from leaking into the cargo or passenger 

compartments and coming into contact 

with a possible ignition source, which 

could result in fire or explosion. 

Relevant Service Information 

We reviewed Boeing Service Bulletins 

757–57–0060, Revision 2, dated May 24, 

2007 (for Model 757–200, 757–200PF, 

and 757–200CB series airplanes); and 

757–57–0061, Revision 1, dated May 24, 

2007 (for Model 757–300 series 

airplanes). These service bulletins 

describe procedures for, depending on 

airplane configuration, inspecting for 

discrepancies and insufficient coverage 

of the secondary fuel barrier, 

determining the thickness of the 

secondary fuel barrier, and corrective 

actions if necessary. Discrepancies 

include missing, peeled, noncontinuous, or non-transparent 

secondary fuel barrier; small air 

bubbles, air pockets, blister-like areas, 

or solid particles in the secondary fuel 

barrier; fillet sealant, primer, corrosioninhibiting compound or other finishes 

applied to the top of the secondary fuel 

barrier; missing fillet (cap) seals; or 

areas of secondary fuel barrier whose 

thickness is less than or greater than 

specified limits; or areas not having a 

transparent quality that makes it 

possible to see a crack in the structure; 

or areas not having a minimum 

application coverage area. Corrective 

actions include repairing the secondary 

fuel barrier, including removal and 

reapplication, if needed; or applying 

more secondary fuel barrier, as needed. 

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 these same 

type designs. 

Proposed AD Requirements 

This proposed AD would require 

accomplishing the actions specified in 

the service information described 

previously, except as discussed under 

‘‘Differences Between the Proposed AD 

and the Service Information.’’ 

Differences Between the Proposed AD 

and the Service Information 

Although Boeing Service Bulletin 

757–57–0060, Revision 2, and Boeing 

Service Bulletin 757–57–0061, Revision 

1, both dated May 24, 2007, specify to 

send the inspection results to the 

manufacturer, this proposed AD would 

not require any report. Boeing Service 

Bulletin 757–57–0060, Revision 2, and 

Boeing Service Bulletin 757–57–0061, 

Revision 1, both dated May 24, 2007, 

refer to a ‘‘detailed visual inspection’’ 

for discrepancies and insufficient 

coverage of the secondary fuel barrier. 

We have determined that the procedures 

in the service bulletin should be 

described as a ‘‘detailed inspection.’’ 

Note 1 has been included in this AD to 

define this type of inspection. 

Costs of Compliance 

We estimate that this proposed AD 

affects 619 airplanes of U.S. registry. We 

estimate the following costs to comply 

with this proposed AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per product 

Cost on U.S. 

operators 

Access and inspect secondary 

fuel barrier.

42 work-hours × $85 per hour = $3,570 per inspection ........ $0 $3,570 $2,209,830 

We estimate the following costs to do 

any necessary repairs that would be 

required based on the results of the 

proposed inspection. We have no way of 

determining the number of aircraft that 

might need these repairs: 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per product 

Apply secondary fuel barrier ............ 7 work-hours × $85 per hour = $595 per secondary fuel barrier application.$0 $595 

According to the manufacturer, some 

of the costs of this proposed AD may be 

covered under warranty, thereby 

reducing the cost impact on affected 

individuals. We do not control warranty 

coverage for affected individuals. As a 

result, we have included all costs in our 

cost estimate. 

Authority for This Rulemaking 

Title 49 of the United States Code 

specifies the FAA’s authority to issue 

rules on aviation safety. Subtitle I, 


jlentini on DSK4TPTVN1PROD with PROPOSALS
66202 Federal Register / Vol. 76, No. 207 / Wednesday, October 26, 2011 / Proposed Rules 

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 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 this 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 adding 

the following new airworthiness 

directive (AD): 

The Boeing Company: Docket No. FAA– 

2011–1094; Directorate Identifier 2011– 

NM–070–AD. 

Comments Due Date 

(a) We must receive comments by 

December 12, 2011. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to The Boeing 

Company Model 757–200, 757–200PF, and 

757–200CB series airplanes, certificated in 

any category, as identified in Boeing Service 

Bulletin 757–57–0060, Revision 2, dated May 

24, 2007; and Model 757–300 series 

airplanes, certificated in any category, as 

identified in Boeing Service Bulletin 757–57– 

0061, Revision 1, dated May 24, 2007. 

Subject 

(d) Joint Aircraft System Component 

(JASC)/Air Transport Association (ATA) of 

America Code 57: Wings. 

Unsafe Condition 

(e) This proposed AD was prompted by 

reports that inspections of the wing center 

section revealed defective, misapplied, or 

missing secondary fuel vapor barrier on the 

center fuel tank. We are issuing this AD to 

detect and correct defective surfaces and 

insufficient thickness of secondary fuel 

barrier, which could allow fuel leaks or 

fumes into the pressurized cabin, and allow 

fuel or fuel vapors to come in contact with 

an ignition source, which could result in a 

fire or an explosion. 

Compliance 

(f) Comply with this AD within the 

compliance times specified, unless already 

done. 

Detailed Inspection 

(g) For airplanes identified in Boeing 

Service Bulletin 757–57–0060, Revision 2, 

dated May 24, 2007, as Group 1, Group 2, 

and Group 4 Configuration 1; and airplanes 

identified in Boeing Service Bulletin 757–57– 

0061, Revision 1, dated May 24, 2007, as 

Group 1, Group 2, and Group 3 Configuration 

1: Within 60 months after the effective date 

of this AD, do a detailed inspection to detect 

discrepancies of the secondary fuel barrier at 

the front spar and the upper panel of the 

wing center section, and if discrepancies 

exist, repair before further flight, in 

accordance with the Accomplishment 

Instructions of Boeing Service Bulletin 757– 

57–0060, Revision 2, dated May 24, 2007; or 

Boeing Service Bulletin 757–57–0061, 

Revision 1, dated May 24, 2007; as 

applicable. 

Note 1: For the purposes of this AD, a 

detailed inspection is: ‘‘An intensive 

examination of a specific item, installation, 

or assembly to detect damage, failure, or 

irregularity. Available lighting is normally 

supplemented with a direct source of good 

lighting at intensity deemed appropriate. 

Inspection aids such as mirror, magnifying 

lenses, etc., may be necessary. Surface 

cleaning and elaborate access procedures 

may be required.’’ 

Inspection of Minimum Application 

Coverage Area 

(h) For Group 3 airplanes identified in 

Boeing Service Bulletin 757–57–0060, 

Revision 2, dated May 24, 2007; and Group 

2 airplanes identified in Boeing Service 

Bulletin 757–57–0061, Revision 1, dated May 

24, 2007: Within 60 months after the effective 

date of this AD, do a detailed inspection of 

the front spar and the upper panel to ensure 

the secondary fuel barrier application covers 

the minimum area specified in Boeing 

Service Bulletin 757–57–0060, Revision 2, 

dated May 24, 2007; or Boeing Service 

Bulletin 757–57–0061, Revision 1, dated May 

24, 2007; as applicable. If the secondary fuel 

barrier does not cover the minimum specified 

area, apply more secondary fuel barrier 

before further flight, in accordance with the 

Accomplishment Instructions of Boeing 

Service Bulletin 757–57–0060, Revision 2, 

dated May 24, 2007; or Boeing Service 

Bulletin 757–57–0061, Revision 1, dated May 

24, 2007; as applicable. 

Measurement of Thickness of Secondary 

Fuel Barrier 

(i) For Group 1, Group 2, and Group 4 

Configuration 1 airplanes identified in 

Boeing Service Bulletin 757–57–0060, 

Revision 2, dated May 24, 2007; and for 

Group 1, Group 2, and Group 3 Configuration 

1 airplanes identified in Boeing Service 

Bulletin 757–57–0061, Revision 1, dated May 

24, 2007: Within 60 months after the effective 

date of this AD, measure the thickness of the 

secondary fuel barrier. If the thickness is less 

than or over the acceptable limits defined in 

Boeing Service Bulletin 757–57–0060, 

Revision 2, dated May 24, 2007; or Boeing 

Service Bulletin 757–57–0061, Revision 1, 

dated May 24, 2007; as applicable, apply 

more secondary fuel barrier or repair before 

further flight, in accordance with the 

Accomplishment Instructions of Boeing 

Service Bulletin 757–57–0060, Revision 2, 

dated May 24, 2007; or Boeing Service 

Bulletin 757–57–0061, Revision 1, dated May 

24, 2007; as applicable. 

(j) For Group 4, Configuration 2 airplanes 

identified in Boeing Service Bulletin 757–57– 

0060, Revision 2, dated May 24, 2007; and 

Group 3, Configuration 2 airplanes identified 

in Boeing Service Bulletin 757–57–0061, 

Revision 1, dated May 24, 2007: Within 60 

months, review the maintenance records to 

determine if there was a minimum of 0.005 

inch of new secondary fuel barrier applied, 

or if the thickness of the secondary fuel 

barrier cannot be determined from the 

maintenance records, measure the thickness 

of the secondary fuel barrier. If the thickness 

is less than or over the acceptable limits 

specified in Boeing Service Bulletin 757–57– 

0060, Revision 2, dated May 24, 2007; or 

Boeing Service Bulletin 757–57–0061, 

Revision 1, dated May 24, 2007; as 

applicable, apply more secondary fuel barrier 

or repair before further flight, in accordance 

with the Accomplishment Instructions of 

Boeing Service Bulletin 757–57–0060, 

Revision 2, dated May 24, 2007; or Boeing 

Service Bulletin 757–57–0061, Revision 1, 

dated May 24, 2007; as applicable. 


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Federal Register / Vol. 76, No. 207 / Wednesday, October 26, 2011 / Proposed Rules 66203 

No Reporting Requirement 

(k) Although Boeing Service Bulletin 757– 

57–0060, Revision 2, dated May 24, 2007; 

and Boeing Service Bulletin 757–57–0061, 

Revision 1, dated May 24, 2007; specify to 

submit certain information to the 

manufacturer, this AD does not include that 

requirement. 

Alternative Methods of Compliance 

(AMOCs) 

(l)(1) The Manager, Seattle Aircraft 

Certification Office, 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 e-mailed to: 9-NMSeattle-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. 

Related Information 

(m)(1) For more information about this AD, 

contact Kevin Nguyen, Aerospace Engineer, 

Propulsion Branch, ANM–140S, FAA, Seattle 

Aircraft Certification Office (ACO), 1601 Lind 

Avenue, SW., Renton, Washington 98057– 

3356; phone: 425–917–6501; fax: 425–917– 

6590; e-mail: kevin.nguyen@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; telephone 

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

5680; e-mail me.boecom@boeing.com; 

Internet https://www. 

boeingfleet.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 October 

17, 2011. 

Kalene C. Yanamura, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2011–27652 Filed 10–25–11; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2011–1095; Directorate 

Identifier 2010–NM–241–AD] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc. Model CL–600–2B16 (CL–601–3A, 

CL–601–3R, and CL–604 Variants) 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to adopt a new 

airworthiness directive (AD) for the 

products listed above. This proposed 

AD results from mandatory continuing 

airworthiness information (MCAI) 

originated by an aviation authority of 

another country to identify and correct 

an unsafe condition on an aviation 

product. The MCAI describes the unsafe 

condition as: 

During pre-delivery inspections and test 

flights, several short circuit events were 

reported, one of which resulted in smoke in 

the cockpit. There were no in-service 

incidents. 

Investigations have identified three 

conditions affecting the wiring of Circuit 

Breaker Panels * * * and Junction Boxes 

* * *, which would lead to short circuiting: 

* * * * * 

If not corrected, these conditions could result 

in arcing, damage to adjacent structure, 

smoke in the cockpit, or loss of system 

redundancies. 

* * * * * 

The proposed AD would require actions 

that are intended to address the unsafe 

condition described in the MCAI. 

DATES: We must receive comments on 

this proposed AD by December 12, 

2011. 

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 W12–40, 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; phone: 514– 

855–5000; fax: 514–855–7401; e-mail: 

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 (phone: 800–647–5527) is in the 

ADDRESSES section. Comments will be 

available in the AD docket shortly after 

receipt. 

FOR FURTHER INFORMATION CONTACT: 

Assata Dessaline, Aerospace Engineer, 

Avionics and Flight Test Branch, ANE– 

172, New York Aircraft Certification 

Office (ACO), FAA, 1600 Stewart Ave. 

Suite 410, Westbury, NY 11590; 

telephone (516) 228–7301; 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–2011–1095; Directorate Identifier 

2010–NM–241–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 

Transport Canada Civil Aviation 

(TCCA), which is the airworthiness 

authority for Canada, has issued 

Canadian Airworthiness Directive CF– 

2010–25, dated August 3, 2010 (referred 

to after this as ‘‘the MCAI’’), to correct 


jlentini on DSK4TPTVN1PROD with PROPOSALS