Daily Rules, Proposed Rules, and Notices of the Federal Government
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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
We invite you to submit any relevant written data, views, or arguments regarding this proposed AD. Send your comments to an address listed under
We will post all comments we receive, without change, to
You can examine the AD docket on the Internet at
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.
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.
This airplane model is manufactured in Canada and is type certificated for operation in the United States under the provisions of § 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.
The following table provides the estimated costs for U.S. operators to comply with this proposed AD.
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.
We have determined that this proposed AD would not have federalism
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
Air transportation, Aircraft, Aviation safety, Safety.
Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:
1. The authority citation for part 39 continues to read as follows:
49 U.S.C. 106(g), 40113, 44701.
2. The FAA amends § 39.13 by adding the following new airworthiness directive (AD):
(a) The Federal Aviation Administration must receive comments on this AD action by March 17, 2005.
(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.
(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.
(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.
(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.
(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.
(i) Canadian airworthiness directive CF-2004-20, dated October 5, 2004, also addresses the subject of this AD.