Discussion
We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to include an AD that would apply to the specified products. That NPRM was published in the Federal Register on December 3, 2009 (74 FR 63331). That NPRM proposed to correct an unsafe condition for the specified products. The MCAI states:
During an elevator Power Control Unit (PCU) Centering Functional Check on two CL-600-2C10 aircraft, sustained oscillations were discovered when a control rod was disconnected. These sustained oscillations could render the elevator surface inoperable and cause subsequent loss of pitch control of the aircraft.
This directive mandates incorporation of a new centering mechanism on the elevator torque tube to prevent these sustained oscillations.
Loss of pitch control could result in reduced controllability of the airplane. You may obtain further information by examining the MCAI in the AD docket.
Comments
We gave thepublic the opportunity to participate in developing this AD. We considered the comment received.
Request To Include Revised Service Information
Comair, Inc., asks that we allow the use of Revision C instead of Revision B of Bombardier Service Bulletin 670BA-27-042 for accomplishing the actions specified in paragraph (f)(1) of the NPRM. Comair, Inc., states that Bombardier has issued Bombardier Service Bulletin 670BA-27-042, Revision C, dated December 10, 2009. We referred to Bombardier Service Bulletin 670BA-27-042, Revision B, dated June 2, 2009, in paragraph (f)(1) of the NPRM as the appropriate source of service information for accomplishing the specified actions.
We agree with the commenter. Bombardier Service Bulletin 670BA-27- 042, Revision C, dated December 10, 2009, makes minor updates and editorial changes; no additional work is necessary on airplanes modified in accordance with Revision B. Therefore, we have revised paragraph (f)(1) of this final rule to refer toBombardier Service Bulletin 670BA-27-042, Revision C, dated December 10, 2009, for accomplishing the specified actions. We have also revised paragraph (f)(2) of this AD to give credit for actions done in accordance with Bombardier Service Bulletin 670BA-27-042, Revision B, dated June 2, 2009.
Explanation of Change Made to This AD
We have changed this AD to identify the correct name of the manufacturer as published in the most recent type certificate data sheet for the affected airplane models.
Conclusion
We reviewed the available data, including the comment received, and determined that air safety and the public interest require adopting the AD with the changes described previously. We 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.
Explanation of Change to Costs of Compliance
Since issuance of the NPRM, we have increased the labor rate used in the Costs of Compliance from $80 per work hour to $85 per work hour. The Costs of Compliance information, below, reflects this increase in the specified hourly labor rate.
Costs of Compliance
We estimate that this AD will affect 260 products of U.S. registry. We also estimate that it will take about 35 work-hours per product to comply with the basic requirements of this AD. The average labor rate is $85 per work-hour. Required parts will cost about $27,626 per product. Where the service information lists required parts costs that are covered under warranty, we have assumed that there will be no charge for these parts. As we do not control warranty coverage for affected parties, some parties may incur costs higher than estimated here. Based on these figures, we estimate the cost of this AD to the U.S. operators to be $7,956,260, or $30,601 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 flightof 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) 647-5527) 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:
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 AD: