Daily Rules, Proposed Rules, and Notices of the Federal Government
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Contact Bombardier, Inc., Canadair, Aerospace Group, P.O. Box 6087, Station Centre-ville, Montreal, Quebec H3C 3G9, Canada, for service information identified in this proposed AD.
We invite you to submit any relevant written data, views, or arguments regarding this proposed AD. Send your comments to an address listed in the
We will post all comments we receive, without change, to
You may 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 Bombardier Model CL-600-2B19 (Regional Jet Series 100 440) airplanes, serial numbers 7003 and subsequent, on which Modsum TC601R16421 has not been incorporated. TCCA advises that during a complete-airplane fatigue test on a Model CL-600-2B19 (Regional Jet Series 100) airplane, a crack was discovered at the lower forward corner of the cargo door skin cut-out. This condition, if not corrected, could result in reduced structural integrity of the airplane.
Bombardier has issued Canadair Regional Jet Temporary Revision (TR) 2B-2109, dated October 13, 2005, to Appendix B, “Airworthiness Limitations,” of the Canadair Regional Jet Maintenance Requirements Manual (MRM). The TR includes Airworthiness Limitations (AWL) Task 53-61-141, which revises thresholds and revises repeat inspection intervals for the cargo door skin cut-out. The cargo door skin cut-out is identified as a principal structural element. Accomplishing the actions specified in the service information is intended to adequately address the unsafe condition. TCCA mandated AWL Task 53-61-141 of the TR and issued Canadian airworthiness directive CF-2005-05, dated February 18, 2005, to ensure the continued airworthiness of these airplanes in Canada.
These airplane models are manufactured in Canada and are type certificated for operation in the United States under the provisions of section 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
Therefore, we are proposing this AD, which would require accomplishing the actions specified in the service information described previously, except as discussed under “Differences Between the Proposed AD and the Canadian Airworthiness Directive.”
Although the Canadian airworthiness directive references TR 2B-2048 (which was later replaced by TR 2B-2084), this proposed AD would reference TR 2B-2109. TR 2B-2109 was issued after the Canadian airworthiness directive, and replaces both TR 2B-2048 and TR 2B-2084.
Although the Canadian airworthiness directive contains initial inspection threshold information in paragraph B. “Phase-In Schedule,” this proposed AD does not state that information because it is included in TR 2B-2109.
These differences have been coordinated with TCCA.
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 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 and placed it in the AD docket. 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 Federal Aviation Administration (FAA) amends § 39.13 by adding the following new airworthiness directive (AD):
(a) The FAA must receive comments on this AD action by March 13, 2006.
(c) This AD applies to Bombardier Model CL-600-2B19 (Regional Jet Series 100 440) airplanes, serial numbers 7003 and subsequent, certificated in any category; on which Bombardier Modsum TC601R16421 or TC601R16422 has not been accomplished.
(d) This AD results from a report that a crack was discovered at the lower forward corner of a cargo door skin cut-out during fatigue testing. We are issuing this AD to detect and correct cracking in the lower forward corner of the cargo door skin cut-out, which could result in reduced structural integrity of the airplane
(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.
This AD requires revisions to certain operator maintenance documents to include new inspections. Compliance with these inspections is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by these inspections, the operator may not be able to accomplish the inspections described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance according to the procedures specified in paragraph (g) of this AD. The request should include a description of changes to the required inspections that will ensure the continued damage tolerance of the affected structure. The FAA has provided guidance for this determination in Advisory Circular (AC) 25-1529.
(f) Within 30 days after the effective date of this AD, revise the Airworthiness Limitations (AWL) section (Appendix B) of the Instructions for Continuing Airworthiness of the Canadair Regional Jet Maintenance Requirements Manual (MRM), to include the information specified in AWL Task 53-61-141 in Canadair Regional Jet Temporary Revision (TR) 2B-2109, dated October 13, 2005. Thereafter, except as provided by paragraph (g) of this AD, no alternative structural inspection intervals may be approved for the cargo door skin cut-out.
The actions required by paragraph (f) of this AD may be done by inserting a copy of TR 2B-2109 into the AWL section of the Canadair Regional Jet MRM. When the contents of TR have been included in general revisions of the MRM, the general revisions may be inserted in the MRM, provided the relevant information in the general revision is identical to that in TR 2B-2109.
(g)(1) The Manager, New York Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19.
(2) Before using any AMOC approved in accordance with § 39.19 on any airplane to which the AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate Holding District Office.
(h) Canadian airworthiness directive CF-2005-05, dated February 18, 2005, also addresses the subject of this AD.