[Federal Register Volume 70, Number 30 (Tuesday, February 15, 2005)]
[Proposed Rules]
[Pages 7674-7676]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 05-2841]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2005-20353; Directorate Identifier 2004-NM-255-AD]
RIN 2120-AA64


Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional 
Jet Series 100 & 440) Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for certain Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 
440) airplanes. This proposed AD would require installing additional 
shielding of the hydraulic lines in the wing box area. This proposed AD 
is prompted by the determination that the additional hydraulic line 
shields will protect the lines from possible impact by tire debris if 
the tire tread fails. We are proposing this AD to prevent damage to the 
hydraulic lines and subsequent leakage from the two hydraulic systems, 
which could result in loss of braking capability on the affected side 
of the airplane, asymmetrical braking, and reduced directional 
control--particularly during a rejected takeoff.

DATES: We must receive comments on this proposed AD by March 17, 2005.

ADDRESSES: Use one of the following addresses to submit comments on 
this proposed AD.
     DOT Docket Web site: Go to http://dms.dot.gov and follow 
the instructions for sending your comments electronically.
     Government-wide rulemaking Web site: Go to http://www.regulations.gov and follow the instructions for sending your 
comments electronically.
     Mail: Docket Management Facility, U.S. Department of 
Transportation, 400 Seventh Street SW., Nassif Building, Room PL-401, 
Washington, DC 20590.
     By fax: (202) 493-2251.
     Hand Delivery: 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.

[[Page 7675]]

    For service information identified in this proposed AD, contact 
Bombardier, Inc., Canadair, Aerospace Group, P.O. Box 6087, Station 
Centre-ville, Montreal, Quebec H3C 3G9, Canada.
    You can examine the contents of this AD docket on the Internet at 
http://dms.dot.gov, or in person at the Docket Management Facility, 
U.S. Department of Transportation, 400 Seventh Street SW., room PL-401, 
on the plaza level of the Nassif Building, Washington, DC. This docket 
number is FAA-2005-20353; the directorate identifier for this docket is 
2004-NM-255-AD.

FOR FURTHER INFORMATION CONTACT: Daniel Parillo, Aerospace Engineer, 
Systems and Flight Test Branch, ANE-172, FAA, New York Aircraft 
Certification Office, 1600 Stewart Avenue, suite 410, Westbury, New 
York 11590; telephone (516) 228-7305; fax (516) 794-5531.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to submit any relevant written data, views, or 
arguments regarding this proposed AD. Send your comments to an address 
listed under ADDRESSES. Include ``Docket No. FAA-2005-20353; 
Directorate Identifier 2004-NM-255-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of the proposed AD. We will 
consider all comments submitted by the closing date and may amend the 
proposed AD in light of those comments.
    We will post all comments we receive, without change, to http://dms.dot.gov, including any personal information you provide. We will 
also post a report summarizing each substantive verbal contact with FAA 
personnel concerning this proposed AD. Using the search function of our 
docket Web site, anyone can find and read the comments in any of our 
dockets, including the name of the individual who sent the comment (or 
signed the comment on behalf of an association, business, labor union, 
etc.). You can review the DOT's complete Privacy Act Statement in the 
Federal Register published on April 11, 2000 (65 FR 19477-78), or you 
can visit http://dms.dot.gov.

Examining the Docket

    You can examine the AD docket on the Internet at http://dms.dot.gov, or in person at the Docket Management Facility office 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The Docket Management Facility office (telephone (800) 647-
5227) is located on the plaza level of the Nassif Building at the DOT 
street address stated in the ADDRESSES section. Comments will be 
available in the AD docket shortly after the DMS receives them.

Discussion

    Transport Canada Civil Aviation (TCCA), which is the airworthiness 
authority for Canada, notified us that an unsafe condition may exist on 
certain Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) 
airplanes. TCCA advises that additional shielding of the hydraulic 
lines in the wing box area is necessary to protect the lines from 
possible impact by tire debris if the tire tread fails. If both lines 
have enough damage to cause leakage from the two hydraulic systems, 
braking capability on the affected side of the airplane would be lost, 
resulting in asymmetrical braking and reduced directional control--
particularly during a rejected takeoff.

Relevant Service Information

    The manufacturer has issued Bombardier Service Bulletin 601R-57-
021, Revision ``C,'' dated February 23, 2004. The service bulletin 
describes procedures for installing additional hydraulic line shields 
to cover exposed hydraulic lines on both sides of the wing box area. 
The procedures also include replacing the left and right inboard brake 
lines with new lines to eliminate fouling of the lines with the shield. 
Accomplishing the actions specified in the service information is 
intended to adequately address the unsafe condition. TCCA mandated the 
service information and issued Canadian airworthiness directive CF-
2004-20, dated October 5, 2004, to ensure the continued airworthiness 
of these airplanes in Canada.

FAA's Determination and Requirements of the Proposed AD

    This airplane model is manufactured in Canada and is type 
certificated for operation in the United States under the provisions of 
Sec.  21.29 of the Federal Aviation Regulations (14 CFR 21.29) and the 
applicable bilateral airworthiness agreement. Pursuant to this 
bilateral airworthiness agreement, TCCA has kept the FAA informed of 
the situation described above. We have examined TCCA's findings, 
evaluated all pertinent information, and determined that we need to 
issue an AD for products of this type design that are certificated for 
operation in the United States.
    Therefore, we are proposing this AD, which would require 
accomplishing the actions specified in the service information 
described previously.

Costs of Compliance

    The following table provides the estimated costs for U.S. operators 
to comply with this proposed AD.

                                                                     Estimated Costs
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                                                                                                                     Number of U.S.-
                Action                      Work hours       Average labor          Parts        Cost per airplane      registered         Fleet cost
                                                             rate per hour                                              airplanes
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Shield installation...................                16                $65                 $0             $1,040                 91            $94,640
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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

[[Page 7676]]

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); and
    3. 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.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this proposed AD. See the ADDRESSES section for a location 
to examine the regulatory evaluation.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, 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.


Sec.  39.13  [Amended]

    2. The FAA amends Sec.  39.13 by adding the following new 
airworthiness directive (AD):

Bombardier, Inc. (Formerly Canadair): Docket No. FAA-2005-20353; 
Directorate Identifier 2004-NM-255-AD.

Comments Due Date

    (a) The Federal Aviation Administration must receive comments on 
this AD action by March 17, 2005.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Bombardier Model CL-600-2B19 (Regional 
Jet series 100 & 440) airplanes, certificated in any category, 
serial numbers 7003 through 7067 inclusive, 7069 through 7165 
inclusive, 7167 through 7169 inclusive, and 7171 through 7188 
inclusive.

Unsafe Condition

    (d) This AD was prompted by the determination that additional 
shielding of the hydraulic lines in the wing box area will protect 
the lines from possible impact by tire debris if the tire tread 
fails. We are proposing this AD to prevent damage to the hydraulic 
lines and subsequent leakage from the two hydraulic systems, which 
could result in loss of braking capability on the affected side of 
the airplane, asymmetrical braking, and reduced directional 
control--particularly during a rejected takeoff.

Compliance

    (e) You are responsible for having the actions required by this 
AD performed within the compliance times specified, unless the 
actions have already been done.

Installation of Hydraulic Line Shields

    (f) Within 24 months after the effective date of this AD, 
install additional shielding of the hydraulic lines in the wing box 
area, by doing all the actions specified in the Accomplishment 
Instructions of Bombardier Service Bulletin 601R-57-021, Revision 
`C,' dated February 23, 2004.
    (g) We also consider the requirements of paragraph (f) of this 
AD to be met if the installation is done before the effective date 
of this AD in accordance with Bombardier Service Bulletin 601R-57-
021, Revision `B,' dated July 18, 2001.

Alternative Methods of Compliance (AMOCs)

    (h) The Manager, New York Aircraft Certification Office, FAA, 
has the authority to approve AMOCs for this AD, if requested in 
accordance with the procedures found in 14 CFR 39.19.

Related Information

    (i) Canadian airworthiness directive CF-2004-20, dated October 
5, 2004, also addresses the subject of this AD.

    Issued in Renton, Washington, on February 6, 2005.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 05-2841 Filed 2-14-05; 8:45 am]
BILLING CODE 4910-13-P