Conclusion

We reviewed the relevant data and determined that air safety and the public interest require adopting the AD with the changes described previously. We also determined that these changes will not increase the economic burden on any operator or increase the scope of the AD. Differences Between This AD and the MCAI or Service Information

We have reviewed the MCAI and related service information and, in general, agree with their substance. But we might have found it necessary to use different words from those in the MCAI to ensure the AD is clear for U.S. operators and is enforceable. In making these changes, we do not intend to differ substantively from the information provided in the MCAI and related service information.

We might also have required different actions in this AD from those in the MCAI in order to follow our FAA policies. Any such differences are highlighted in a NOTE within the AD.

Costs of Compliance

We estimate that this AD affects about 689 products of U.S. registry. We also estimate that it takes about 1 workhour per product to comply with the basic requirements of this AD. The average labor rate is $80 per workhour. Based on these figures, we estimate the cost of the AD on U.S. operators to be $55,120, or $80 per product. 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 determined that this AD will not have federalism implications under Executive Order 13132. This AD will 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 AD:

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 AD and placed it in the AD docket.

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 the NPRM, the regulatory evaluation, any comments received, and other information. The street address for the Docket Operations office (telephone (800) 6475527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
Adoption of the Amendment
Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
[[Page 13102]]
PART 39AIRWORTHINESS 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 AD: 20080602 Bombardier, Inc. (Formerly Canadair): Amendment 3915414. Docket No. FAA20070413; Directorate Identifier 2007NM341AD. Effective Date
(a) This airworthiness directive (AD) becomes effective April 16, 2008.
Affected ADs
(b) None.
Applicability
(c) This AD applies to all Bombardier Model CL6002B19
(Regional Jet Series 100 & 440) airplanes, certificated in any category, all serial numbers.

Note 1: 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 paragraph (g)(1) of this AD. The request should include a description of changes to the required inspections that will ensure the continued operational safety of the airplane.
Subject
(d) Air Transport Association (ATA) of America Code 28: Fuel. Reason
(e) The mandatory continuing airworthiness information (MCAI) states:

Bombardier Aerospace has completed a system safety review of the aircraft fuel system against fuel tank standards introduced in Chapter 525 of the Airworthiness Manual through Notice of Proposed Amendment (NPA) 2002043. The identified noncompliances were then assessed using Transport Canada Policy Letter No. 525001, to determine if mandatory corrective action is required.

The assessment showed that supplemental maintenance tasks [for certain bonding jumpers, wiring harnesses, and hydraulic systems, among other items] are required to prevent potential ignition sources inside the fuel system, which could result in a fuel tank explosion. Revision has been made to Canadair Regional Jet Model CL 6002B19 Maintenance Requirements Manual, CSP A053, Part 2, Appendix D, ``Fuel System Limitations'' to introduce the required maintenance tasks.
The corrective action is revising the Airworthiness Limitations Section of the Instructions for Continued Airworthiness to incorporate new limitations for fuel tank systems.
Actions and Compliance
(f) Unless already done, do the following actions.
(1) Within 60 days after the effective date of this AD, or on or before December 16, 2008, whichever occurs first, revise the Airworthiness Limitations Section (ALS) of the Instructions for Continued Airworthiness to incorporate the inspection and
maintenance requirements, as applicable, in Appendix D, ``Fuel System Limitations,'' of Part 2, ``Airworthiness Requirements,'' of Bombardier CL6002B19 Maintenance Requirements Manual CSP A053, Revision 7, dated May 10, 2007 (``the MRM''), task numbers 281100 601, 281100602, 281100603, 281100604, 293301601, and 29
3301602. For those task numbers, the initial compliance times start from the later of the times specified in paragraphs (f)(1)(i) and (f)(1)(ii) of this AD, and the repetitive inspections must be accomplished thereafter at the interval specified in the MRM, except as provided by paragraphs (f)(2), (f)(3), (f)(4), (f)(5) and (g)(1) of this AD. Accomplishing the revision in accordance with a later revision of the MRM is an acceptable method of compliance if the revision is approved by the Manager, New York Aircraft Certification Office (ACO), FAA, or Transport Canada Civil Aviation (TCCA) (or its delegated agent).
(i) The effective date of this AD.
(ii) The date of issuance of the original Canadian standard airworthiness certificate or the date of issuance of the original Canadian export certificate of airworthiness.
(2) For airplanes having more than 15,000 flight hours as of the effective date of this AD, the initial compliance time for Tasks 28 1100601, 281100602, 281100603, and 281100604 is within
5,000 flight hours after the effective date of this AD. Thereafter, these tasks must be accomplished within the repetitive interval specified in Appendix D, ``Fuel System Limitations,'' of Part 2, ``Airworthiness Requirements,'' of Bombardier CL6002B19
Maintenance Requirements Manual CSP A053, Revision 7, dated May 10, 2007.
(3) For Task 293301601, the initial compliance time is within 5,000 flight hours after the effective date of this AD. Thereafter, task 293301601 must be accomplished within the repetitive
interval specified in Appendix D, ``Fuel System Limitations,'' of Part 2, ``Airworthiness Requirements,'' of Bombardier CL6002B19 Maintenance Requirements Manual CSP A053, Revision 7, dated May 10, 2007.
(4) For airplanes having more than 27,500 flight hours as of the effective date of this AD, the initial compliance time for Task 29 3301602 is within 2,500 flight hours after the effective date of this AD. Thereafter, this task must be accomplished within the repetitive interval specified in Appendix D, ``Fuel System Limitations,'' of Part 2, ``Airworthiness Requirements,'' of Bombardier CL6002B19 Maintenance Requirements Manual CSP A053, Revision 7, dated May 10, 2007.
(5) After accomplishing the actions specified in paragraphs (f)(1), (f)(2), (f)(3), and (f)(4) of this AD, no alternative inspections or inspection intervals may be used unless the inspection or interval is part of a later revision of Appendix D, ``Fuel System Limitations,'' of Part 2, ``Airworthiness
Requirements,'' of Bombardier CL6002B19 Maintenance Requirements Manual CSP A053, Revision 7, dated May 10, 2007, that is approved by the Manager, New York ACO, FAA, or TCCA (or its delegated agent); or the limit or interval is approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (g)(1) of this AD.

FAA AD Differences

Note 2: This AD differs from the MCAI and/or service information as follows: No differences.
Other FAA AD Provisions
(g) The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Rocco Viselli, Aerospace Engineer, Airframe and Propulsion Branch, ANE171, FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 2287331; fax (516) 794 5531. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO.
(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 FAAapproved. Corrective actions are considered FAAapproved 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.
(3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act, the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120 0056.
Related Information
(h) Refer to MCAI Canadian Airworthiness Directive CF200729, dated November 22, 2007, and Appendix D, ``Fuel System
Limitations,'' of Part 2, ``Airworthiness Requirements,'' of Bombardier CL6002B19 Maintenance Requirements Manual CSP A053, Revision 7, dated May 10, 2007.
Material Incorporated by Reference
(i) You must use Appendix D, ``Fuel System Limitations,'' of Part 2, ``Airworthiness Requirements,'' of Bombardier CL6002B19 Maintenance Requirements Manual CSP053, Revision 7, dated May 10, 2007, to do the actions
[[Page 13103]]
required by this AD, unless the AD specifies otherwise.
(1) The Director of the Federal Register approved the
incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) For service information identified in this AD, contact Bombardier, Inc., Canadair, Aerospace Group, P.O. Box 6087, Station Centreville, Montreal, Quebec H3C 3G9, Canada.
(3) You may review copies at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call (202) 7416030, or go to: http://www.archives.gov/federalregister/cfr/ibr locations.html.

Issued in Renton, Washington, on February 28, 2008. Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification Service.
[FR Doc. E84501 Filed 31108; 8:45 am]
BILLING CODE 491013P

FOR FURTHER INFORMATION CONTACT Rocco Viselli, Aerospace Engineer, Airframe and Propulsion Branch, ANE171, FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 2287331; fax (516) 7945531.