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###### Department of Transportation

###### Federal Aviation Administration 

          - 14 CFR Part 39 
          - [Docket No. FAA-2008-0649; Directorate Identifier 2008-CE-038-AD; Amendment 39-15646; AD 2008-17-08] 
          - 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) issued 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: 

A DG-500MB experienced, after the engine shutdown, an uncommanded retraction of its powerplant. 

                            Investigations revealed that some bolts of the extension retraction mechanism had                                   ( print page 48293)                                fractured because of fatigue stress due to increasing push-pull loads acting on incorrectly tightened screws.                         

This condition, if not corrected, could lead to damage of the propeller and the fuselage, thereby reducing the structural integrity of the sailplane.

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

# DATES:

This AD becomes effective September 23, 2008. 

On September 23, 2008, the Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD. 

# ADDRESSES:

                        You may examine the AD docket on the Internet at                         *http://www.regulations.gov*                         or in person at Document Management Facility, U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590.                     

# FOR FURTHER INFORMATION CONTACT:

                        Gregory Davison, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106;                         *telephone:*                         (816) 329-4130;                         *fax:*                         (816) 329-4090.                     

# 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 June 13, 2008 (73 FR 33743). That NPRM proposed to correct an unsafe condition for the specified products. The MCAI states:                 

A DG-500MB experienced, after the engine shutdown, an uncommanded retraction of its powerplant. 

Investigations revealed that some bolts of the extension retraction mechanism had fractured because of fatigue stress due to increasing push-pull loads acting on incorrectly tightened screws. 

This condition, if not corrected, could lead to damage of the propeller and the fuselage, thereby reducing the structural integrity of the sailplane. 

To address this unsafe condition, this Airworthiness Directive mandates the replacement of eight bolts, the four connecting the fork 5M203 to the 5M204 adapter and those connecting the adapter 5M204 to the spindle drive, by new ones of higher strength and, a rework of the coupling of the 5M203 fork to the 5M204 adapter as well as the coupling of the 5M204 adapter to the spindle drive, by glueing the parts together, in addition to the pre-existing bolts.

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

## Costs of Compliance 

We estimate that this AD will affect 4 products of U.S. registry. We also estimate that it will take about 3 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 $63 per product. 

Based on these figures, we estimate the cost of the AD on U.S. operators to be $1,212, or $303 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 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 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.                 

# 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: 

**2008-17-08 DG Flugzeugbau GmbH:**                             Amendment 39-15646; Docket No. FAA-2008-0649; Directorate Identifier 2008-CE-038-AD.                                   ( print page 48294)    

## Effective Date 

(a) This airworthiness directive (AD) becomes effective September 23, 2008. 

## Affected ADs 

(b) None. 

## Applicability 

(c) This AD applies to DG-500MB powered sailplanes, all serial numbers, certificated in any category. 

## Subject 

(d) Air Transport Association of America (ATA) Code 71: Power Plant. 

## Reason 

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

A DG-500MB experienced, after the engine shutdown, an uncommanded retraction of its powerplant. 

Investigations revealed that some bolts of the extension retraction mechanism had fractured because of fatigue stress due to increasing push-pull loads acting on incorrectly tightened screws. 

This condition, if not corrected, could lead to damage of the propeller and the fuselage, thereby reducing the structural integrity of the sailplane. 

To address this unsafe condition, this Airworthiness Directive mandates the replacement of eight bolts, the four connecting the fork 5M203 to the 5M204 adapter and those connecting the adapter 5M204 to the spindle drive, by new ones of higher strength and, a rework of the coupling of the 5M203 fork to the 5M204 adapter as well as the coupling of the 5M204 adapter to the spindle drive, by glueing the parts together, in addition to the pre-existing bolts. 

## Actions and Compliance 

(f) Unless already done, within the next 30 days after September 23, 2008 (the effective date of this AD), modify the spindle drive assembly in accordance with DG Flugzeugbau GmbH Technical Note No. 843/27, dated April 14, 2008, and DG Flugzeugbau GmbH Drawing 5M210, dated April 14, 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, Standards Office, 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:*                             Greg Davison, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106;                             *telephone:*                             (816) 329-4130;                             *fax:*                             (816) 329-4090. Before using any approved AMOC on any powered sailplane 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 (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

(h) Refer to MCAI European Aviation Safety Agency (EASA) AD No. 2008-0095, dated May 16, 2008; and DG Flugzeugbau GmbH Technical Note No. 843/27, dated April 14, 2008, for related information.

## Material Incorporated by Reference

(i) You must use DG Flugzeugbau GmbH Technical Note No. 843/27, dated April 14, 2008, and DG Flugzeugbau GmbH Drawing 5M210, dated April 14, 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 DG Flugzeugbau GmbH, Im Schollengarten 20, D-76646 Bruchsal 4, Federal Republic of Germany.

                            (3) You may review copies at the FAA, Central Region, Office of the Regional Counsel, 901 Locust, Room 506, Kansas City, Missouri 64106; 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 Kansas City, Missouri, on August 8, 2008.

Kim Smith,

Manager, Small Airplane Directorate, Aircraft Certification Service.

 [FR Doc. E8-18809 Filed 8-18-08; 8:45 am]

BILLING CODE 4910-13-P