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Rule

Airworthiness Directives; Aerospatiale Model ATR42 and ATR72 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.

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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) issued by an airworthiness authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as electrical arcing due to chafing between a bonding cable and electrical wires in the 120 VU (volt unit) electrical harness, causing the loss of some instruments and loss of one hydraulic circuit pressure (i.e., loss of pressure of one hydraulic circuit). We are issuing this AD to require actions to correct the unsafe condition on these products.

DATES:

This AD becomes effective July 19, 2007.

The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD as of July 19, 2007.

ADDRESSES:

You may examine the AD docket on the Internet at http://dms.dot.gov or in person at the Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street, SW., Nassif Building, Room PL-401, Washington, DC.

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FOR FURTHER INFORMATION CONTACT:

Tom Rodriguez, Aerospace Engineer, International Branch, ANM-116, FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425) 227-1137; fax (425) 227-1149.

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SUPPLEMENTARY INFORMATION:

Discussion

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

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 2, 2007 (72 FR 9475). That NPRM proposed to require inspecting the harness installation in the 120 VU (volt unit) electrical harness and, as applicable, restoring correct installation of the bonding cable. The MCAI states that recently an ATR 42 suffered electrical arcing, causing the loss of some instruments and loss of one hydraulic circuit pressure (i.e., loss of pressure of one hydraulic circuit) due to chafing between a bonding cable and electrical wires in the 120 VU electrical harness. The investigation showed that a tubular support had been deformed and therefore impaired the spacing among electrical harness, supports, and cables; the harness was not correctly attached; the size of the harness was increased by addition of cables (for Service Bulletins (SB) or customer modifications embodiments); and the bonding cable was not correctly installed. The MCAI mandates an inspection of the ATR 42 and ATR 72 fleet for correct installation of the bonding cable and restoring correct installation of the bonding cable if necessary.

Comments

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

Request To Include Revised Service Bulletins

Avions de Transport Regional (ATR) states that in the NPRM reference is made to Avions de Transport Regional Start Printed Page 32779Service Bulletins ATR42-92-0012 and ATR72-92-1013, both dated July 4, 2006. ATR notes that this corresponds to the original issue of both service bulletins, and adds that those bulletins have been revised to add a reference to European Aviation Safety Agency Airworthiness Directive 2006-0283. ATR states that nothing else has been changed, and suggests that the AD reference Avions de Transport Regional Service Bulletins ATR42-92-0012 and ATR72-92-1013, both Revision 01, both dated December 7, 2006.

We agree to reference Revision 01 of the service bulletins in the AD. We have reviewed Revision 01 of the service bulletins, and the procedures are essentially the same as those in the original issues, as noted by ATR. We have changed paragraphs (e) and (g) of this AD to specify Revision 01 of the service bulletins.

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 change described previously. We determined that this change 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 a U.S. court of law. 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 described in a separate paragraph of the AD. These requirements, if any, take precedence over the actions copied from the MCAI.

Costs of Compliance

Based on the service information, we estimate that this AD affects about 53 products of U.S. registry. We also estimate that it takes about 1 work-hour per product to comply with this AD. The average labor rate is $80 per work-hour. Based on these figures, we estimate the cost of the inspection on U.S. operators to be $4,240, 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 that this AD:

(1) Is not a “significant regulatory action” under Executive Order 12866;

(2) Is not a “significant rule” under 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 Management Facility 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 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

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Adoption of the Amendment

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

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PART 39—AIRWORTHINESS DIRECTIVES

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

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

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

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2007-12-20 Aerospatiale: Amendment 39-15098. Docket No. FAA-2007-27358; Directorate Identifier 2006-NM-270-AD.

Effective Date

(a) This airworthiness directive (AD) becomes effective July 19, 2007.

Affected ADs

(b) None.

Applicability

(c) This AD applies to Model ATR42-200, -300, -320, and -500 airplanes; all serial numbers up to manufacturer serial number (MSN) 643 inclusive; and Model ATR72-101, -102, -201, -202, -211, -212, and -212A airplanes, all serial numbers up to MSN 728 inclusive, except MSN 723 and 725; certificated in any category.

Reason

(d) The mandatory continuing airworthiness information (MCAI) states that recently an ATR 42 suffered electrical arcing, causing the loss of some instruments and loss of one hydraulic circuit pressure (i.e., loss of pressure of one hydraulic circuit) due to chafing between a bonding cable and electrical wires in the 120 VU (volt unit) electrical harness. The investigation showed that a tubular support had been deformed and therefore impaired the spacing among electrical harness, supports, and cables; the harness was not correctly attached; the size of the harness was increased by addition of cables (for Service Bulletins (SB) or customer modifications embodiments); and the bonding cable was not correctly installed. The MCAI mandates an inspection of the ATR 42 and ATR 72 fleet for correct installation of the bonding cable and restoring correct installation of the bonding cable if necessary.

Actions and Compliance

(e) Unless already done, do the following actions. Within 3 months after the effective date of this AD: Inspect the harness installation in the 120 VU electrical harness and, as applicable, restore correct installation of the bonding cable, in accordance with the instructions given by Avions de Transport Start Printed Page 32780Regional Service Bulletins ATR42-92-0012 (for Model ATR42 airplanes) and ATR72-92-1013 (for Model ATR72 airplanes), both dated July 4, 2006; or Revision 01, both dated December 7, 2006; as applicable.

FAA AD Differences

Note:

This AD differs from the MCAI and/or service information as follows: No differences.

Other FAA AD Provisions

(f) 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: Tom Rodriguez, Aerospace Engineer, 1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425) 227-1137; 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

(g) Refer to MCAI European Aviation Safety Agency Airworthiness Directive 2006-0283, dated September 14, 2006; and the Avions de Transport Regional Service Bulletins specified in Table 1 of this AD for related information.

Table 1.—Related Service Information

Avions de transport regional service bulletinRevision levelDate
ATR42-92-0012OriginalJuly 4, 2006.
ATR42-92-001201December 7, 2006.
ATR72-92-1013OriginalJuly 4, 2006.
ATR72-92-101301December 7, 2006

Material Incorporated by Reference

(h) You must use the applicable Avions de Transport Regional Service Bulletins specified in Table 2 of this AD 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 Aerospatiale, 316 Route de Bayonne, 31060 Toulouse, Cedex 03, France.

(3) You may review copies at the FAA, Transport Airplane Directorate, 1601 Lind Ave., 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.

Table 2.—Material Incorporated by Reference

Avions de transport regional service bulletinRevision levelDate
ATR42-92-0012OriginalJuly 4, 2006.
ATR42-92-001201December 7, 2006.
ATR72-92-1013OriginalJuly 4, 2006.
ATR72-92-101301December 7, 2006
Start Signature

Issued in Renton, Washington, on June 1, 2007.

Ali Bahrami,

Manager, Transport Airplane Directorate, Aircraft Certification Service.

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[FR Doc. E7-11202 Filed 6-13-07; 8:45 am]

BILLING CODE 4910-13-P