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###### Department of Transportation

###### Federal Aviation Administration 

          - 14 CFR Part 39 
          - [Docket No. FAA-2008-0541; Directorate Identifier 2008-NM-063-AD; Amendment 39-15624; AD 2008-16-06] 
          - RIN 2120-AA64 

# 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: 

                            Resulting from the assessment of fuel tank wiring installations required by SFAR 88 (Special Federal Aviation Regulation 88) and equivalent JAA/EASA (Joint Aviation                                   ( print page 45347)                                Authorities/European Aviation Safety Agency) policy, BAE Systems identified two features in the Jetstream 4100 where the need for design changes was apparent. * * *                         

Insufficient or defective bonding in the fuel tank area, if not corrected, could lead to ignition of fuel vapours and subsequent fuel tank explosion. 

* * * * *

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

# DATES:

This AD becomes effective September 9, 2008. 

The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of September 9, 2008. 

# ADDRESSES:

                        You may examine the AD docket on the Internet at                        *http://www.regulations.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.                     

# FOR FURTHER INFORMATION CONTACT:

Todd Thompson, Aerospace Engineer, International Branch, ANM-116, Transport Airplane Directorate, FAA, 1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425) 227-1175; fax (425) 227-1149. 

# 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 May 13, 2008 (73 FR 27477). That NPRM proposed to correct an unsafe condition for the specified products. The MCAI states:                 

Resulting from the assessment of fuel tank wiring installations required by SFAR 88 (Special Federal Aviation Regulation 88) and equivalent JAA/EASA (Joint Aviation Authorities/European Aviation Safety Agency) policy, BAE Systems identified two features in the Jetstream 4100 where the need for design changes was apparent. One of these is addressed by Service Bulletin (SB) J41-28-013 which introduces additional bonding leads between pipes, structure and various components to improve the electrical bond paths within the fuel tank areas. This design change is identified by modification number JM41659. Additionally, SB J41-28-013 provides instructions to inspect the existing bonding leads, to replace any defective leads and to examine all fuel system pipe runs in the wings to ensure appropriate clearances are maintained. 

Insufficient or defective bonding in the fuel tank area, if not corrected, could lead to ignition of fuel vapours and subsequent fuel tank explosion. 

For the reason stated above, this EASA Airworthiness Directive (AD) requires the installation of additional bonding leads, inspection [for defects] of existing bonding leads and [for clearance of] all fuel system pipe runs in the wings and follow-on corrective actions, as necessary. 

Corrective actions include replacing any defective bonding leads and adjusting clearances of the fuel system pipe runs. You may obtain further information by examining the MCAI in the AD docket. 

## Comments 

We gave the public the opportunity to participate in developing this AD. We received no comments on the NPRM or on the determination of the cost to the public. 

## Conclusion 

We reviewed the available data 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 

We estimate that this AD will affect about 7 products of U.S. registry. We also estimate that it will take about 80 work-hours per product to comply with the basic requirements of this AD. The average labor rate is $80 per work-hour. Required parts will cost about $1,700 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 $56,700, or $8,100 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) 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,                               ( print page 45348)                            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: 

**2008-16-06 BAE Systems (Operations) Limited (Formerly British Aerospace Regional Aircraft):**                             Amendment 39-15624. Docket No. FAA-2008-0541; Directorate Identifier 2008-NM-063-AD.                         

## Effective Date 

(a) This airworthiness directive (AD) becomes effective September 9, 2008. 

## Affected ADs 

(b) None. 

## Applicability 

(c) This AD applies to all BAE Systems (Operations) Limited Model Jetstream 4101 airplanes, certificated in any category, all serial numbers. 

## Subject 

(d) Air Transport Association (ATA) of America Code 28: Fuel. 

## Reason 

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

Resulting from the assessment of fuel tank wiring installations required by SFAR 88 (Special Federal Aviation Regulation 88) and equivalent JAA/EASA (Joint Aviation Authorities/European Aviation Safety Agency) policy, BAE Systems identified two features in the Jetstream 4100 where the need for design changes was apparent. One of these is addressed by Service Bulletin (SB) J41-28-013 which introduces additional bonding leads between pipes, structure and various components to improve the electrical bond paths within the fuel tank areas. This design change is identified by modification number JM41659. Additionally, SB J41-28-013 provides instructions to inspect the existing bonding leads, to replace any defective leads and to examine all fuel system pipe runs in the wings to ensure appropriate clearances are maintained. 

Insufficient or defective bonding in the fuel tank area, if not corrected, could lead to ignition of fuel vapours and subsequent fuel tank explosion. 

For the reason stated above, this EASA Airworthiness Directive (AD) requires the installation of additional bonding leads, inspection [for defects] of existing bonding leads and [for clearance of] all fuel system pipe runs in the wings and follow-on corrective actions, as necessary. 

Corrective actions include replacing any defective bonding leads and adjusting clearances of the fuel system pipe runs. 

## Actions and Compliance 

(f) Within 24 months after the effective date of this AD, unless already done, do the following actions. 

(1) Inspect the bonding leads between ribs 1 and 9, and between ribs 16 and 19, in the left-hand (LH) and right-hand (RH) wings in accordance with paragraph 2.B.(2) of the Accomplishment Instructions of BAE Systems (Operations) Limited Service Bulletin J41-28-013, Revision 1, dated January 10, 2008; and, before next flight, replace all defective bonding leads with airworthy parts in accordance with the service bulletin. 

(2) Inspect all fuel system pipe runs inside the LH and RH wings in accordance with paragraph 2.B.(3) of the Accomplishment Instructions of BAE Systems (Operations) Limited Service Bulletin J41-28-013, Revision 1, dated January 10, 2008; and, if incorrect clearances are found, before next flight, adjust clearances in accordance with the service bulletin. 

(3) Install additional electrical bonding of components within the LH and RH wings in accordance with paragraphs 2.B.(4) to 2.B.(15) of the Accomplishment Instructions of BAE Systems (Operations) Limited Service Bulletin J41-28-013, Revision 1, dated January 10, 2008. 

## 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, Transport Airplane Directorate, 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:*                             Todd Thompson, Aerospace Engineer, International Branch, ANM-116, Transport Airplane Directorate, FAA, 1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425) 227-1175; 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 EASA Airworthiness Directive 2008-0040, dated February 27, 2008; and BAE Systems (Operations) Limited Service Bulletin J41-28-013, Revision 1, dated January 10, 2008; for related information. 

## Material Incorporated by Reference 

(i) You must use BAE Systems (Operations) Limited Service Bulletin J41-28-013, Revision 1, dated January 10, 2008, 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 British Aerospace Regional Aircraft American Support, 13850 Mclearen Road, Herndon, Virginia 20171. 

                            (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*.                         

Issued in Renton, Washington, on July 23, 2008. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, Aircraft Certification Service.

[FR Doc. E8-17621 Filed 8-4-08; 8:45 am] 

BILLING CODE 4910-13-P