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###### Department of Transportation

###### Federal Aviation Administration 

          - 14 CFR Part 39 
          - [Docket No. FAA-2007-27595; Directorate Identifier 2006-NM-248-AD] 
          - RIN 2120-AA64 

# AGENCY:

Federal Aviation Administration (FAA), DOT. 

# ACTION:

Notice of proposed rulemaking (NPRM). 

# SUMMARY:

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed 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: 

It has been revealed that the control surface balancing procedure in the * * * SAAB 2000 SRM (structural repair manual) * * * is incorrect. 

* * * * *

Incorrect balance, outside the tolerance of the aileron control surface, may lead to vibrations that in [the] worst case can result in flutter.

The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI. 

# DATES:

We must receive comments on this proposed AD by April 16, 2007. 

# ADDRESSES:

You may send comments by any of the following methods: 
      -  DOT Docket Web Site: Go to http://dms.dot.gov                          and follow the instructions for sending your comments electronically.                     
      -  Fax:                          (202) 493-2251.                     
      -  Mail:                          Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street, SW., Nassif Building, Room PL-401, Washington, DC 20590-0001.                     
      -  Hand Delivery:                          Room PL-401 on the plaza level of the Nassif Building, 400 Seventh Street, SW., Washington, DC, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.                     
      -  Federal eRulemaking Portal: http://www.regulations.gov.                          Follow the instructions for submitting comments.                     

## Examining the AD Docket 

                    You may examine the AD docket on the Internet at                     *http://dms.dot.gov;*                     or in person at the Docket Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this proposed AD, the regulatory evaluation, any comments received, and other information. The street address for the Docket Office (telephone (800) 647-5227) is in the                     **ADDRESSES**                     section. Comments will be available in the AD docket shortly after receipt.                 

# FOR FURTHER INFORMATION CONTACT:

Mike Borfitz, Aerospace Engineer, International Branch, ANM-116, FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425) 227-2677; fax (425) 227-1149. 

# SUPPLEMENTARY INFORMATION:

## Streamlined Issuance of AD 

                    The FAA is implementing a new process for streamlining the issuance of ADs related to MCAI. This streamlined process will allow us to adopt MCAI safety requirements in a more efficient manner and will reduce safety risks to the public. This process continues to follow all FAA AD issuance processes to meet legal, economic, Administrative Procedure Act, and                     **Federal Register**                     requirements. We also continue to meet our technical decision-making responsibilities to identify and correct unsafe conditions on U.S.-certificated products.                 

This proposed AD references the MCAI and related service information that we considered in forming the engineering basis to correct the unsafe condition. The proposed AD contains text copied from the MCAI and for this reason might not follow our plain language principles. 

## Comments Invited 

                    We invite you to send any written relevant data, views, or arguments about this proposed AD. Send your comments to an address listed under the                     **ADDRESSES**                     section. Include “Docket No. FAA-2007-27595; Directorate Identifier 2006-NM-248-AD” at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this proposed AD. We will consider all comments received by the closing date and may amend this proposed AD based on those comments.                 

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

## Discussion 

The European Aviation Safety Agency (EASA), which is the Technical Agent for the Member States of the European Community, has issued EASA Emergency Airworthiness Directive 2006-0053-E, dated February 22, 2006 (referred to after this as “the MCAI”), to correct an unsafe condition for the specified products. The MCAI states: 

It has been revealed that the control surface balancing procedure in the web and CD/DVD versions of the SAAB 2000 SRM (structural repair manual) Chapter 51-60-00, Control Surface Balancing Procedure is incorrect. The incorrect Calculation formula (pages 1, 4 and 7) was incorporated in Revision 21 of the SRM dated April 01/05 and was distributed in 4 July 2005 on the CD/DVD issue Apr. 01/05. 

In the incorrect formula, an “x” (multiplication) has been replaced with a “+” (addition) when the data was converted in the system and if this formula is followed, you may receive a result outside of the allowed tolerance. 

Incorrect balance, outside the tolerance of the aileron control surface, may lead to vibrations that in [the] worst case can result in flutter. 

                        The hard copy of the manual, SAAB 2000 SRM, is correct.                               ( print page 12577)    

The CD/DVD dated Oct 01/05, marked “Reissue”, includes a correct SAAB SRM revision 22. 

The corrective action includes identifying ailerons that have been balanced after July 4, 2005. If balanced incorrectly, they must be rebalanced. You may obtain further information by examining the MCAI in the AD docket. 

## Relevant Service Information 

Saab has issued Service Bulletin 2000-57-040, dated February 23, 2006. 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 Proposed 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 this State of Design Authority, we have been notified of the unsafe condition described in the MCAI and service information referenced above. We are proposing this AD because we evaluated all pertinent information and determined an unsafe condition exists and is likely to exist or develop on other products of the same type design. 

## 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 proposed different actions in this AD from those in the MCAI in order to follow FAA policies. Any such differences are described in a separate paragraph of the proposed AD. These requirements, if ultimately adopted, will take precedence over the actions copied from the MCAI. 

## Costs of Compliance 

Based on the service information, we estimate that this proposed AD would affect about 3 products of U.S. registry. We also estimate that it would take about 1 work-hour per product to identify ailerons that have been balanced after July 4, 2005. The average labor rate is $80 per work-hour. Based on these figures, we estimate the cost of the proposed AD for U.S. operators to be $240, or $80 per product. 

In addition, we estimate that any necessary follow-on actions would take about 20 work-hours, for a cost of $1,600 per product. We have no way of determining the number of products that may need these actions. 

## 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 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 this 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. 

# List of Subjects in 14 CFR Part 39

      - Air transportation
      - Aircraft
      - Aviation safety
      - Safety

## The Proposed Amendment 

Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 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: 

**Saab Aircraft AB:**                                 Docket No. FAA-2007-27595; Directorate Identifier 2006-NM-248-AD.                             

## Comments Due Date 

(a) We must receive comments by April 16, 2007. 

## Affected ADs 

(b) None. 

## Applicability 

(c) This AD applies to Saab Model SAAB 2000 airplanes, certificated in any category, ranging from serial number -004 through -063, on which aileron, P/N (part number) 7357600-501/502, P/N 7357600-503/504, P/N 7357600-505/506, P/N 7357600-507/508, P/N 7357991-601/602, P/N 7357991-603/604, P/N 7357991-605/606, P/N 7357995-843/844, or P/N 7357995-927/928, is installed. 

## Subject 

(d) Wings. 

## Reason 

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

It has been revealed that the control surface balancing procedure in the web and CD/DVD versions of the SAAB 2000 SRM (Structural Repair Manual) Chapter 51-60-00, Control Surface Balancing Procedure is incorrect. The incorrect Calculation formula (page 1, 4 and 7) was incorporated in Revision 21 of the SRM dated April 01/05 and was distributed in 4 July 2005 on the CD/DVD issue Apr. 01/05. 

In the incorrect formula, an “x” (multiplication) has been replaced with a “+” (addition) when the data was converted in the system and if this formula is followed, you may receive a result outside of the allowed tolerance. 

Incorrect balance, outside the tolerance of the aileron control surface, may lead to vibrations that in [the] worst case can result in flutter. 

The hard copy of the manual, SAAB 2000 SRM, is correct. 

The CD/DVD dated Oct 01/05, marked “Reissue”, includes a correct SAAB SRM revision 22. 

                                The corrective action includes identifying ailerons that have been balanced after July 4, 2005 until the effective date of this AD. If balanced incorrectly, they must be rebalanced.                                       ( print page 12578)    

## Actions and Compliance 

(f) Within one month after the effective date of this AD, unless already done, do the following actions. 

(1) Identify ailerons that have been balanced after July 4, 2005. If balanced incorrectly, they must be rebalanced before further flight in accordance with Saab Service Bulletin 2000-57-040, dated February 23, 2006. 

(2) As of the effective date of this AD, the aileron balancing procedure contained in he CD/DVD “Issue Date: Apr 01/05” including the Saab SAAB 2000 SRM at Revision 21 and the CD/DVD “Issue Date: Oct 01/05” including SRM at Revision 22 may not be used. 

## FAA AD Differences 

# Note:

 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, International Branch, ANM-116, FAA, ATTN: Mike Borfitz, Aerospace Engineer, 1601 Lind Avenue, SW., Renton, Washington 98057-3356, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. 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.                             

                                (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 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 European Aviation Safety Agency Emergency Airworthiness Directive 2006-0053-E, dated February 22, 2006, and Saab Service Bulletin 2000-57-040, dated February 23, 2006.

Issued in Renton, Washington, on March 9, 2007. 

Ali Bahrami, 

Manager,  Transport Airplane Directorate, Aircraft Certification Service.

 [FR Doc. E7-4862 Filed 3-15-07; 8:45 am] 

BILLING CODE 4910-13-P