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Airworthiness Directives; Saab Model SAAB 2000 Airplanes

Document Details

Information about this document as published in the Federal Register.

Published Document

This document has been published in the Federal Register. Use the PDF linked in the document sidebar for the official electronic format.

Start Preamble

AGENCY:

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

ACTION:

Final rule.

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:

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.

We are issuing this AD to require actions to correct the unsafe condition on these products.

DATES:

This AD becomes effective November 7, 2007.

The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of November 7, 2007.

ADDRESSES:

You may examine the AD docket on the Internet at http://dms.dot.gov or in person at the U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey, Avenue, SE., Washington, DC.

Start Further Info

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.

End Further Info End Preamble Start Supplemental Information

SUPPLEMENTARY INFORMATION:

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 March 16, 2007 (72 FR 12576). That NPRM proposed 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 (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 “×” (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. If balanced incorrectly, they must be rebalanced.

Comments

We gave the public the opportunity to participate in developing this AD. We considered the comments received.

Request To Withdraw the NPRM

Saab points out that at the time European Aviation Safety Agency (EASA) issued Emergency Airworthiness Directive 2006-0053-E, dated February 22, 2006 (the MCAI), the hard copy of the structural repair manual (SRM) was correct but the Web and CD/DVD versions had an incorrect calculation formula. At that time, the FAA did not issue an emergency AD because there were only 3 of the affected airplanes operating in the U.S. and the Start Printed Page 56257operators stated that they had not used the incorrect formula. The rest of the affected fleet was operating in Europe and subject to the EASA Emergency AD. SAAB AB states that this means that no affected airplane is operating with a rigging performed according to the incorrect formula. Saab recommends that we withdraw the NPRM and do not issue the AD.

We disagree with the request to withdraw the NPRM. The number of affected airplanes of U.S. registry has grown from 3 to 7 in the past year, a growth trend that could continue. We cannot be certain that all airplanes that are placed on the U.S. Register have had the ailerons balanced correctly. Issuance of this AD will ensure that airplanes will be in compliance before being permitted to operate in the U.S. We have revised the Costs of Compliance paragraph of this AD to reflect the current number of U.S.-registered airplanes. We have made no other change to the AD in this regard.

Request To Refer to Later Revisions of the CD/DVD

Saab requests that we change the following phrase from paragraph (e) of the NPRM: “The CD/DVD dated Oct 01/05, marked ‘Reissue’, includes a correct SAAB SRM revision 22.” Saab states that the SRM has been revised a couple of times since the MCAI was issued, and that revision 23 and higher of the SRM have the correct formula.

We acknowledge that revision 23 and higher of the SRM also have the correct formula. However, we have not revised the text in paragraph (e) of the AD because that text is simply a direct quote from the MCAI. We have not changed the AD in this regard.

Conclusion

We reviewed the available data, including the comments received, and determined that air safety and the public interest require adopting the AD as proposed.

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

Based on the service information, we estimate that this AD affects about 7 products of U.S. registry. We also estimate that it takes 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 AD for U.S. operators to be $560, 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://dms.dot.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.

Start List of Subjects

List of Subjects in 14 CFR Part 39

End List of Subjects

Adoption of the Amendment

Start Amendment Part

Accordingly, under the authority delegated to me by the Administrator, the FAA amends

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PART 39—AIRWORTHINESS DIRECTIVES

End Part Start Amendment Part

1. The authority citation for part 39 continues to read as follows:

End Amendment Part Start Authority

Authority: 49 U.S.C. 106(g), 40113, 44701.

End Authority
[Amended]
Start Amendment Part

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

End Amendment Part

2007-20-06 Saab Aircraft AB: Amendment 39-15216. Docket No. FAA-2007-27595; Directorate Identifier 2006-NM-248-AD.

Effective Date

(a) This airworthiness directive (AD) becomes effective November 7, 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) Air Transport Association (ATA) of America Code 57: 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.Start Printed Page 56258

In the incorrect formula, an “×” (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.

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 the 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, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Mike Borfitz, Aerospace Engineer, International Branch, ANM-116, Transport Airplane Directorate, FAA, 1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone 227-2677; fax (425) 227-1149. 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 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.

Material Incorporated by Reference

(i) You must use Saab Service Bulletin 2000-57-040, dated February 23, 2006, including Attachment 1, dated April 1, 2006, 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 Saab Aircraft AB, SAAB Aircraft Product Support, S-581.88, Linköping, Sweden.

(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) 741-6030, or go to: http://www.archives.gov/​federal-register/​cfr/​ibr-locations.html.

Start Signature

Issued in Renton, Washington, on September 21, 2007.

Ali Bahrami,

Manager, Transport Airplane Directorate, Aircraft Certification Service.

End Signature End Supplemental Information

[FR Doc. E7-19199 Filed 10-2-07; 8:45 am]

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