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###### Department of Transportation

###### Federal Aviation Administration 

          - 14 CFR Part 39 
          - [Docket No. FAA-2007-27431; Directorate Identifier 2007-CE-016-AD] 
          - RIN 2120-AA64 

# AGENCY:

Federal Aviation Administration (FAA), Department of Transportation (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                               ( print page 20073)                            product. The MCAI describes the unsafe condition as:                     

Service experience showed that the connection screw of the propeller blade follower type 10AP-VM may break and the main part of the blade follower can be lost in flight. This condition, if not corrected, could lead to high vibration during powered flight and consequently result in decreased control of the aircraft. 

Stemme has developed a new blade follower, Model 10AP-VP, which is reinforced on the shaft and has an Allen head screw installed instead of a slotted screw. For the reason stated above, this Emergency Airworthiness Directive (EAD) requires the replacement of the blade follower type 10AP-VM with the new type 10AP-VP. 

This EAD has been revised to correct the TCDS reference and the applicability statement. No separate TC was issued for the affected propellers. These propellers are part of the aircraft type design. 

Paragraph (4) of the “Compliance” section of this EAD has been corrected.

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 May 23, 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:                          Go to                          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:

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:

## 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-2007-27431; Directorate Identifier 2007-CE-016-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 because of 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 AD No. 2006-0373R1-E, dated December 15, 2006, corrected January 5, 2007 (referred to after this as “the MCAI”), to correct an unsafe condition for the specified products. The MCAI states: 

Service experience showed that the connection screw of the propeller blade follower type 10AP-VM may break and the main part of the blade follower can be lost in flight. This condition, if not corrected, could lead to high vibration during powered flight and consequently result in decreased control of the aircraft. 

Stemme has developed a new blade follower, Model 10AP-VP, which is reinforced on the shaft and has an Allen head screw installed instead of a slotted screw. For the reason stated above, this Emergency Airworthiness Directive (EAD) requires the replacement of the blade follower type 10AP-VM with the new type 10AP-VP. 

This EAD has been revised to correct the TCDS reference and the applicability statement. No separate TC was issued for the affected propellers. These propellers are part of the aircraft type design. 

Paragraph (4) of the “Compliance” section of this EAD has been corrected.

You may obtain further information by examining the MCAI in the AD docket. 

## Relevant Service Information 

Stemme GmbH & Co. KG has issued STEMME F & D Service Bulletin (SB) A31-10-078, Am.-Index: 01.a, dated November 6, 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 the 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, they have notified us of the unsafe condition described in the MCAI and service information referenced above. We are proposing this AD because we evaluated all information and determined the unsafe condition exists and is likely to exist or develop on other products of the same type design. 

## Differences Between This Proposed 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 highlighted in a note within the proposed AD. 

## Costs of Compliance 

                    Based on the service information, we estimate that this proposed AD would                           ( print page 20074)                        affect about 53 products of U.S. registry. We also estimate that it would take about 3 work-hours per product to comply with the basic requirements of this proposed AD. The average labor rate is $80 per work-hour. Required parts would cost about $117 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 costs. 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 the proposed AD on U.S. operators to be $18,921, or $357 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 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: 

**Stemme GmbH & Co. KG Models STEMME S10-V and STEMME S10-VT Powered Sailplanes:**                                 Docket No. FAA-2007-27431; Directorate Identifier 2007-CE-016-AD.                             

## Comments Due Date 

(a) We must receive comments by May 23, 2007. 

## Affected ADs 

(b) None. 

## Applicability 

(c) This AD applies to Models STEMME S10-V and STEMME S10-VT powered sailplanes, all serial numbers, certificated in any category. 

## Subject 

(d) Air Transport Association of America (ATA) Code 61: Propellers. 

## Reason 

(e) The mandatory continuing airworthiness information (MCAI) states:  Service experience showed that the connection screw of the propeller blade follower type 10AP-VM may break and the main part of the blade follower can be lost in flight. This condition, if not corrected, could lead to high vibration during powered flight and consequently result in decreased control of the aircraft. 

Stemme has developed a new blade follower, Model 10AP-VP, which is reinforced on the shaft and has an Allen head screw installed instead of a slotted screw. For the reason stated above, this Emergency Airworthiness Directive (EAD) requires the replacement of the blade follower type 10AP-VM with the new type 10AP-VP. 

This EAD has been revised to correct the TCDS reference and the applicability statement. No separate TC was issued for the affected propellers. These propellers are part of the aircraft type design. 

Paragraph (4) of the “Compliance” section of this EAD has been corrected. 

## Actions and Compliance 

(f) Unless already done, within 25 engine operating hours or 90 days after the effective date of this AD, whichever occurs first, do the following actions: 

(1) Replace the blade follower type 10AP-VM with the new type 10AP-VP following the instructions contained in STEMME F & D SB A31-10-078, Am.-index: 01.a, dated November 6, 2006. 

(2) As of 25 engine operating hours or 90 days after the effective date of this AD, do not install a propeller type 10AP-F, 10AP-V or 11AP-V on any aircraft, unless that propeller has the new type 10AP-VP blade follower installed following the instructions contained in STEMME F & D SB A31-10-078, Am.-index: 01.a, dated November 6, 2006. 

## FAA AD Differences 

# Note:

This AD differs from the MCAI and/or service information as follows: The MCAI requires an amendment to the aircraft flight manual before further flight as an interim requirement to the replacement. We consider before flight as an urgent safety of flight compliance time, and we do not consider this unsafe condition to be an urgent safety of flight condition. We feel that 25 engine operating hours or 90 days, whichever occurs first, for the replacement is an adequate compliance for this AD action and meets the FAA requirements of a notice of proposed rulemaking (NPRM). We do encourage you to incorporate these flight manual amendments referenced in the MCAI and service information until you replace the propeller blade follower.

## Other FAA AD Provisions 

(g) The following provisions also apply to this AD: 

                                (1)                                 *Alternative Methods of Compliance (AMOCs):*                                 The Manager, Standards Staff, FAA, ATTN: Gregory Davison, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri, 64106; telephone: (816) 329-4130; fax: (816) 329-4090, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. 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 (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.                                       ( print page 20075)    

## Related Information 

(h) Refer to MCAI European Aviation Safety Agency (EASA) Emergency AD No.: 2006-0373R1-E, dated December 15, 2006, corrected January 5, 2007; and STEMME F & D SB A31-10-078, Am.-index: 01.a, dated November 6, 2006, for related information. 

Issued in Kansas City, Missouri, on April 17, 2007. 

Charles L. Smalley, 

Acting Manager, Small Airplane Directorate,  Aircraft Certification Service.

[FR Doc. E7-7642 Filed 4-20-07; 8:45 am] 

BILLING CODE 4910-13-P