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###### Department of Transportation

###### Federal Aviation Administration

          - 14 CFR Part 39
          - [Docket No. FAA-2010-0851; Directorate Identifier 2010-NM-171-AD; Amendment 39-16424; AD 2010-18-11]
          - RIN 2120-AA64

# AGENCY:

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

# ACTION:

Final rule; request for comments.

# SUMMARY:

We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

During maintenance at the vendor's facility, some HSTAs [horizontal stabilizer trim actuators] were assembled with the incorrect load bearing balls. The material of these discrepant balls has lower wear characteristics and as such, has a shorter expected life. If not corrected, this condition can result in the HSTA jam leading to difficulties in controlling the aircraft. 

* * * * *

The unsafe condition is possible loss of controllability of the airplane. This AD requires actions that are intended to address the unsafe condition described in the MCAI.

# DATES:

This AD becomes effective September 17, 2010.

The Director of the Federal Register approved the incorporation by reference of a certain publication listed in the AD as of September 17, 2010.

We must receive comments on this AD by October 18, 2010.

# ADDRESSES:

You may send comments by any of the following methods:
      -  Federal eRulemaking Portal:                          Go to                          http://www.regulations.gov . Follow the instructions for submitting comments.                    
      -  Fax:                          (202) 493-2251.                    
      -  Mail:                          U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590.                    
      -  Hand Delivery:                          U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-40, 1200 New Jersey Avenue, SE., Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.                    

## 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 this AD, 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.                

# FOR FURTHER INFORMATION CONTACT:

Christopher Alfano, Aerospace Engineer, Airframe and Mechanical Systems Branch, ANE-171, FAA, New York Aircraft Certification Office (ACO), 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228-7340; fax (516) 794-5531.

# SUPPLEMENTARY INFORMATION:

## Discussion

Transport Canada Civil Aviation (TCCA), which is the aviation authority for Canada, has issued Canadian Airworthiness Directive CF-2010-20, dated July 19, 2010 (referred to after this as “the MCAI”), to correct an unsafe condition for the specified products. The MCAI states:

During maintenance at the vendor's facility, some HSTAs were assembled with the incorrect load bearing balls. The material of these discrepant balls has lower wear characteristics and as such, has a shorter expected life. If not corrected, this condition can result in the HSTA jam leading to difficulties in controlling the aircraft.

This directive mandates incorporation of the HSTA with the correct load bearing balls.

                    The unsafe condition is possible loss of controllability of the airplane. The corrective action requires inspecting to determine the serial number of the HSTAs. You may obtain further information by examining the MCAI in the AD docket.                          ( print page 53850)    

## Relevant Service Information

Bombardier has issued Service Bulletin 670BA-27-057, dated June 14, 2010. The actions described in this service information are intended to correct the unsafe condition identified in the MCAI.

## FAA's Determination and Requirements of This AD

This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to our bilateral agreement with the State of Design Authority, we have been notified of the unsafe condition described in the MCAI and service information referenced above. We are issuing this AD because we evaluated all pertinent information and determined the unsafe condition exists and is likely to exist or develop on other products of the same type design.

## Differences Between the 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 FAA policies. Any such differences are highlighted in a NOTE within the AD.

## FAA's Determination of the Effective Date

An unsafe condition exists that requires the immediate adoption of this AD. The FAA has found that the risk to the flying public justifies waiving notice and comment prior to adoption of this rule because some HSTAs were assembled with load bearing balls that have lower wear characteristics and a shorter life expectancy. If not corrected, this condition can result in the HSTA jam leading to difficulties in controlling the airplane. The unsafe condition is possible loss of controllability of the airplane. Therefore, we determined that notice and opportunity for public comment before issuing this AD are impracticable and that good cause exists for making this amendment effective in fewer than 30 days.

## Comments Invited

                    This AD is a final rule that involves requirements affecting flight safety, and we did not precede it by notice and opportunity for public comment. We invite you to send any written relevant data, views, or arguments about this AD. Send your comments to an address listed under the                     **ADDRESSES**                     section. Include “Docket No. FAA-2010-0851; Directorate Identifier 2010-NM-171-AD” at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this AD. We will consider all comments received by the closing date and may amend this AD because of those comments.                

                    We will post all comments we receive, without change, to                     *http://www.regulations.gov*, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive about this AD.                

## 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.

# 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.

§ 39.13 

2. The FAA amends § 39.13 by adding the following new AD: 

**2010-18-11 Bombardier, Inc.:**                             Amendment 39-16424. Docket No. FAA-2010-0851; Directorate Identifier 2010-NM-171-AD.                        

## Effective Date

(a) This airworthiness directive (AD) becomes effective September 17, 2010.

## Affected ADs

(b) None.

## Applicability

(c) This AD applies to Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702); Model CL-600-2D15 (Regional Jet Series 705); and Model CL-600-2D24 (Regional Jet Series 900) airplanes; certificated in any category; having horizontal stabilizer trim actuators (HSTAs) with part number (P/N) 8489-7 or 8489-7R.

## Subject

(d) Air Transport Association (ATA) of America Code 27: Flight controls.

## Reason

(e) The mandatory continued airworthiness information (MCAI) states:

During maintenance at the vendor's facility, some HSTAs were assembled with the incorrect load bearing balls. The material of these discrepant balls has lower wear characteristics and as such, has a shorter expected life. If not corrected, this condition can result in the HSTA jam leading to difficulties in controlling the aircraft.

* * * * *

The unsafe condition is possible loss of controllability of the airplane.

## Compliance

                            (f) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.                                  ( print page 53851)    

## Actions

(g) Within 500 flight cycles after the effective date of this AD: Inspect HSTAs having P/Ns 8489-7 and 8489-7R to determine if the serial numbers (S/Ns) identified in paragraph 1.A., “Effectivity,” of Bombardier Service Bulletin 670BA-27-057, dated June 14, 2010, are installed. A review of airplane maintenance records is acceptable in lieu of this inspection if the serial number of the HSTA can be conclusively determined from that review.

(1) For any HSTA with a serial number that is not identified in paragraph 1.A., “Effectivity,” of Bombardier Service Bulletin 670BA-27-057, dated June 14, 2010: No further action is required by paragraph (g) of this AD.

(2) For any HSTA with a serial number that is identified in paragraph 1.A., “Effectivity,” of Bombardier Service Bulletin 670BA-27-057, dated June 14, 2010: Replace the HSTA with a serviceable HSTA, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-057, dated June 14, 2010, at the applicable time specified by paragraph (g)(2)(i), (g)(2)(ii), (g)(2)(iii), or (g)(2)(iv) of this AD.

# Note 1:

 Bombardier Service Bulletin 670BA-27-057, dated June 14, 2010, references Sagem SA Service Bulletin 8489-27-006, dated December 8, 2009, as an additional source of guidance for modifying the HSTA. Sagem SA Service Bulletin 8489-27-006, dated December 8, 2009, references Ratier-Figeac Service Bulletin RF-DSC-075-07, Version 03, dated November 10, 2009, as an additional source of guidance for modifying the HSTA. The suffix “A” after the serial number indicates serviceable HSTAs that have been modified.

(i) For any HSTA that has accumulated less than or equal to 8,000 flight cycles as of the effective date of this AD: Before the HSTA accumulates 10,000 flight cycles.

(ii) For any HSTA that has accumulated more than 8,000 flight cycles but less than or equal to 10,000 flight cycles as of the effective date of this AD: Before the HSTA accumulates an additional 2,000 flight cycles, but no later than 11,000 flight cycles on the HSTA.

(iii) For any HSTA that has accumulated more than 10,000 flight cycles but less than or equal to 12,000 flight cycles as of the effective date of this AD: Before the HSTA accumulates an additional 1,000 flight cycles, but no later than 12,500 flight cycles on the HSTA.

(iv) For any HSTAs that has accumulated more than 12,000 flight cycles as of the effective date of this AD: Before the HSTA accumulates an additional 500 flight cycles.

(h) As of the effective date of this AD, no person may install an HSTA, having P/N 8489-7 or 8489-7R, with a serial number identified in paragraph 1.A., “Effectivity,” of Bombardier Service Bulletin 670BA-27-057, dated June 14, 2010, on any airplane.

## FAA AD Differences

# Note 2:

 This AD differs from the MCAI and/or service information as follows: Canadian Airworthiness Directive CF-2010-20, dated July 19, 2010, refers to an incorrect date of April 28, 2010, for Bombardier Service Bulletin 670BA-27-057. The correct date for Bombardier Service Bulletin 670BA-27-057 is June 14, 2010.

## Other FAA AD Provisions

(i) The following provisions also apply to this AD:

                            (1)                             *Alternative Methods of Compliance (AMOCs):*                             The Manager, New York Aircraft Certification Office (ACO), ANE-170, 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:*                             Program Manager, Continuing Operational Safety, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone 516-228-7300; fax 516-794-5531. Before using any approved AMOC on any airplane to which the AMOC applies, notify your principal maintenance inspector (PMI) or principal avionics inspector (PAI), as appropriate, or lacking a principal inspector, your local Flight Standards District Office. The AMOC approval letter must specifically reference this AD.                        

                            (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 FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to ensure 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 (44 U.S.C. 3501*et seq.*), the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120-0056.                        

## Related Information

(j) Refer to MCAI Canadian Airworthiness Directive CF-2010-20, dated July 19, 2010; and Bombardier Service Bulletin 670BA-27-057, dated June 14, 2010; for related information.

## Material Incorporated by Reference

(k) You must use Bombardier Service Bulletin 670BA-27-057, dated June 14, 2010, to do the actions 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., 400 Côte-Vertu Road West, Dorval, Québec H4S 1Y9, Canada; telephone 514-855-5000; fax 514-855-7401; e-mail                             *thd.crj@aero.bombardier.com;*                             Internet                             *http://www.bombardier.com.*

(3) You may review copies of the service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington. For information on the availability of this material at the FAA, call 425-227-1221.

                            (4) You may also review copies of the service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to:                             *http://www.archives.gov/​federal_​register/​code_​of_​federal_​regulations/​ibr_​locations.html.*

Issued in Renton, Washington, on August 20, 2010.

Jeffrey E. Duven,

Acting Manager, Transport Airplane Directorate, Aircraft Certification Service.

[FR Doc. 2010-21563 Filed 9-1-10; 8:45 am]

BILLING CODE 4910-13-P