Airworthiness Directives; Sikorsky Aircraft Corporation (Sikorsky) Model S-92A Helicopters, 42340-42342 [2010-17756]

Download as PDF 42340 Federal Register / Vol. 75, No. 139 / Wednesday, July 21, 2010 / Proposed Rules erowe on DSK5CLS3C1PROD with PROPOSALS-1 and State Materials and Environmental Management Programs, U.S. Nuclear Regulatory Commission, Washington, DC 20555–0001, telephone (301) 415– 6219, e-mail Jayne.McCausland@nrc.gov. Federal Rulemaking Web Site: Public comments and supporting materials related to this proposed rule can be found at https://www.regulations.gov by searching on Docket ID NRC-2010-0183. Procedural Background This rule is limited to the changes contained in Amendment 6 to CoC No. 1025 and does not include other aspects of the NAC–MPC System design. Because NRC considers this action noncontroversial and routine, the NRC is publishing this proposed rule concurrently as a direct final rule in the Rules and Regulations section of this Federal Register. Adequate protection of public health and safety and the environment continues to be ensured. The direct final rule will become effective on October 4, 2010. However, if the NRC receives significant adverse comments on the direct final rule by August 20, 2010, then the NRC will publish a document that withdraws the direct final rule. If the direct final rule is withdrawn, the NRC will address the comments received in response to the proposed revisions in a subsequent final rule. Absent significant modifications to the proposed revisions requiring republication, the NRC will not initiate a second comment period on this action in the event the direct final rule is withdrawn. A significant adverse comment is a comment where the commenter explains why the rule would be inappropriate, including challenges to the rule’s underlying premise or approach, or would be ineffective or unacceptable without a change. A comment is adverse and significant if: (1) The comment opposes the rule and provides a reason sufficient to require a substantive response in a notice-andcomment process. For example, a substantive response is required when: (a) The comment causes the NRC staff to reevaluate (or reconsider) its position or conduct additional analysis; (b) The comment raises an issue serious enough to warrant a substantive response to clarify or complete the record; or (c) The comment raises a relevant issue that was not previously addressed or considered by the NRC staff. (2) The comment proposes a change or an addition to the rule, and it is apparent that the rule would be ineffective or unacceptable without incorporation of the change or addition. VerDate Mar<15>2010 15:10 Jul 20, 2010 Jkt 220001 (3) The comment causes the NRC staff to make a change (other than editorial) to the rule, CoC, or TS. For additional procedural information and the regulatory analysis, see the direct final rule published in the Rules and Regulations section of this Federal Register. are also issued under sec. 133, 98 Stat. 2230 (42 U.S.C. 10153) and sec. 218(a), 96 Stat. 2252 (42 U.S.C. 10198). List of Subjects in 10 CFR Part 72 * * * * * Certificate Number: 1025. Initial Certificate Effective Date: April 10, 2000. Amendment Number 1 Effective Date: November 13, 2001. Amendment Number 2 Effective Date: May 29, 2002. Amendment Number 3 Effective Date: October 1, 2003. Amendment Number 4 Effective Date: October 27, 2004. Amendment Number 5 Effective Date: July 24, 2007. Amendment Number 6 Effective Date: October 4, 2010. SAR Submitted by: NAC International, Inc. SAR Title: Final Safety Analysis Report for the NAC Multi-Purpose Canister System (NAC–MPC System). Docket Number: 72–1025. Certificate Expiration Date: April 10, 2020. Model Number: NAC–MPC. * * * * * Administrative practice and procedure, Hazardous Waste, Nuclear materials, Occupational safety and health, Radiation protection, Reporting and recordkeeping requirements, Security measures, Spent nuclear fuel, Whistleblowing. For the reasons set out in the preamble and under the authority of the Atomic Energy Act of 1954, as amended; the Energy Reorganization Act of 1974, as amended; the Nuclear Waste Policy Act of 1982, as amended, and 5 U.S.C. 553; the NRC is proposing to adopt the following amendments to 10 CFR Part 72. PART 72—LICENSING REQUIREMENTS FOR THE INDEPENDENT STORAGE OF SPENT NUCLEAR FUEL, HIGH-LEVEL RADIOACTIVE WASTE, AND REACTOR-RELATED GREATER THAN CLASS C WASTE 1. The authority citation for Part 72 continues to read as follows: Authority: Secs. 51, 53, 57, 62, 63, 65, 69, 81, 161, 182, 183, 184, 186, 187, 189, 68 Stat. 929, 930, 932, 933, 934, 935, 948, 953, 954, 955, as amended, sec. 234, 83 Stat. 444, as amended (42 U.S.C. 2071, 2073, 2077, 2092, 2093, 2095, 2099, 2111, 2201, 2232, 2233, 2234, 2236, 2237, 2238, 2282); sec. 274, Pub. L. 86–373, 73 Stat. 688, as amended (42 U.S.C. 2021); sec. 201, as amended, 202, 206, 88 Stat. 1242, as amended, 1244, 1246 (42 U.S.C. 5841, 5842, 5846); Pub. L. 95–601, sec. 10, 92 Stat. 2951 as amended by Pub. L. 102– 486, sec. 7902, 106 Stat. 3123 (42 U.S.C. 5851); sec. 102, Pub. L. 91–190, 83 Stat. 853 (42 U.S.C. 4332); secs. 131, 132, 133, 135, 137, 141, Pub. L. 97–425, 96 Stat. 2229, 2230, 2232, 2241, sec. 148, Pub. L. 100–203, 101 Stat. 1330–235 (42 U.S.C. 10151, 10152, 10153, 10155, 10157, 10161, 10168); sec. 1704, 112 Stat. 2750 (44 U.S.C. 3504 note); sec. 651(e), Pub. L. 109–58, 119 Stat. 806–10 (42 U.S.C. 2014, 2021, 2021b, 2111). Section 72.44(g) also issued under secs. 142(b) and 148(c), (d), Pub. L. 100–203, 101 Stat. 1330–232, 1330–236 (42 U.S.C. 10162(b), 10168(c),(d)). Section 72.46 also issued under sec. 189, 68 Stat. 955 (42 U.S.C. 2239); sec. 134, Pub. L. 97–425, 96 Stat. 2230 (42 U.S.C. 10154). Section 72.96(d) also issued under sec. 145(g), Pub. L. 100–203, 101 Stat. 1330–235 (42 U.S.C. 10165(g)). Subpart J also issued under secs. 2(2), 2(15), 2(19), 117(a), 141(h), Pub. L. 97–425, 96 Stat. 2202, 2203, 2204, 2222, 2244 (42 U.S.C. 10101, 10137(a), 10161(h)). Subparts K and L PO 00000 Frm 00002 Fmt 4702 Sfmt 4702 2. In § 72.214, Certificate of Compliance 1025 is revised to read as follows: § 72.214 List of approved spent fuel storage casks. Dated at Rockville, Maryland, this 6th day of July 2010. For the Nuclear Regulatory Commission. R.W. Borchardt, Executive Director for Operations. [FR Doc. 2010–17847 Filed 7–20–10; 8:45 am] BILLING CODE 7590–01–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2010–0720; Directorate Identifier 2010–SW–050–AD] RIN 2120–AA64 Airworthiness Directives; Sikorsky Aircraft Corporation (Sikorsky) Model S–92A Helicopters Federal Aviation Administration, DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: This document proposes adopting a new airworthiness directive (AD) for Sikorsky Model S–92A helicopters. This proposal would require revising the airworthiness limitations section of the Instructions SUMMARY: E:\FR\FM\21JYP1.SGM 21JYP1 Federal Register / Vol. 75, No. 139 / Wednesday, July 21, 2010 / Proposed Rules erowe on DSK5CLS3C1PROD with PROPOSALS-1 for Continued Airworthiness (ICA) to reduce the life limit of the main gearbox housing and replacing any main gearbox housing that exceeds the life limit. This proposal is prompted by a fatigue analysis conducted after a helicopter was found with a severed main gearbox mounting foot pad (foot pad) that failed due to fatigue. The actions specified by this proposed AD are intended to prevent failure of the main gearbox mounting housing foot pad, loss of the main gearbox, and subsequent loss of control of the helicopter. DATES: Comments must be received on or before September 20, 2010. ADDRESSES: Use one of the following addresses to submit comments on this proposed AD: • Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments. • Fax: 202–493–2251. • Mail: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. • Hand Delivery: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. You may examine the comments to this proposed AD in the AD docket on the Internet at https:// www.regulations.gov. FOR FURTHER INFORMATION CONTACT: Michael Schwetz, Aviation Safety Engineer, Boston Aircraft Certification Office, 12 New England Executive Park, Burlington, MA 01803, telephone (781) 238–7761, fax (781) 238–7170. SUPPLEMENTARY INFORMATION: Comments Invited We invite you to submit any written data, views, or arguments regarding this proposed AD. Send your comments to the address listed under the caption ADDRESSES. Include the docket number ‘‘FAA–2010–0720, Directorate Identifier 2010–SW–050–AD’’ at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the proposed AD. We will consider all comments received by the closing date and may amend the proposed AD in light of those comments. We will post all comments we receive, without change, to https:// www.regulations.gov, including any personal information you provide. We will also post a report summarizing each VerDate Mar<15>2010 15:10 Jul 20, 2010 Jkt 220001 substantive verbal contact with FAA personnel concerning this proposed rulemaking. Using the search function of our docket web site, you can find and read the comments to any of our dockets, including the name of the individual who sent or signed the comment. You may review the DOT’s complete Privacy Act Statement in the Federal Register published on April 11, 2000 (65 FR 19477–78). Examining the Docket You may examine the docket that contains the proposed AD, any comments, and other information in person at the Docket Operations office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Operations office (telephone (800) 647–5527) is located in Room W12–140 on the ground floor of the West Building at the street address stated in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. Discussion This document proposes adopting a new AD for Sikorsky Model S–92A helicopters. This proposal would require revising the airworthiness limitations section of the ICA to reduce the life limit of the main gearbox housing from 2700 hours time-in-service (TIS) to 1000 hours TIS and to replace any main gearbox housing that exceeds the lower life limit. This proposal is prompted by review of a fatigue analysis conducted after a helicopter was found with a severed foot pad due to the effect of fatigue of the main gearbox housing. This condition, if not corrected, could result in failure of the main gearbox housing mounting foot pad, loss of the main gearbox, and subsequent loss of control of the helicopter. This unsafe condition is likely to exist or develop on other helicopters of the same type design. Therefore, the proposed AD would require, within 60 days, revising the airworthiness limitations section of the ICA to reduce the life limit of the main gearbox housing from 2700 hours TIS to 1000 hours TIS and replacing, before further flight, any main gearbox housing that has exceeded the 1000-hour TIS life limit. We estimate that this proposed AD would affect 15 helicopters of U.S. registry, and the proposed actions would take about 112 work hours per helicopter at an average labor rate of $85 per work hour. Required parts would cost about $200,000 per helicopter. Based on these figures, we estimate the total cost impact of the proposed AD on U.S. operators would be $3,142,800, PO 00000 Frm 00003 Fmt 4702 Sfmt 4702 42341 assuming all 15 helicopters replace the main gearbox housing. Regulatory Findings We have determined that this proposed AD would not have federalism implications under Executive Order 13132. Additionally, 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 that the 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 draft economic evaluation of the estimated costs to comply with this proposed AD. See the AD docket to examine the draft economic evaluation. 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. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Safety. The Proposed Amendment Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration proposes to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows: E:\FR\FM\21JYP1.SGM 21JYP1 42342 Federal Register / Vol. 75, No. 139 / Wednesday, July 21, 2010 / Proposed Rules 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. Section 39.13 is amended by adding a new airworthiness directive to read as follows: Sikorsky Aircraft Corporation: Docket No. FAA–2010–0720; Directorate Identifier 2010–SW–050–AD. Applicability: Model S–92A helicopters, with main gearbox housing, part number 92351–15110–042, –043, –044, or –045, installed, certificated in any category. Compliance: Required as indicated, unless done previously. To prevent failure of the main gearbox housing mounting foot pad, loss of the main gearbox, and subsequent loss of control of the helicopter, do the following: (a) Within 60 days, revise the airworthiness limitations section of the Instructions for Continued Airworthiness by reducing the life limits of the affected main gearbox housing from 2700 hours time-in-service (TIS) to 1000 hours TIS. (b) After revising the life limit in accordance with paragraph (a) of this AD, before further flight, replace any main gearbox housing that exceeds the life limit of 1000 hours TIS. (c) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Contact the Manager, Boston Aircraft Certification Office, FAA, Attn: Michael Schwetz, Aviation Safety Engineer, 12 New England Executive Park, Burlington, MA 01803, telephone (781) 238–7761, fax (781) 238–7170, for information about previously approved alternative methods of compliance. (d) The Joint Aircraft System/Component (JASC) Code is 6320: Main Rotor Gearbox. Issued in Fort Worth, Texas, on July 13, 2010. Mark R. Schilling, Acting Manager, Rotorcraft Directorate, Aircraft Certification Service. [FR Doc. 2010–17756 Filed 7–20–10; 8:45 am] BILLING CODE 4910–13–P ENVIRONMENTAL PROTECTION AGENCY 40 CFR Part 52 erowe on DSK5CLS3C1PROD with PROPOSALS-1 [EPA–R08–OAR–2007–1033; FRL–9177–7] Approval and Disapproval and Promulgation of Air Quality Implementation Plans; Colorado; Revisions to Regulation 1 Environmental Protection Agency (EPA). ACTION: Proposed rule. AGENCY: VerDate Mar<15>2010 15:10 Jul 20, 2010 Jkt 220001 EPA is proposing to partially approve and partially disapprove a State Implementation Plan (SIP) revision submitted by the State of Colorado regarding its Regulation 1. Regulation 1 provides certain emission controls for opacity, particulates, carbon monoxide and sulfur dioxide. The revision involves the deletion of obsolete, the adoption of new, and the clarification of ambiguous provisions within Regulation 1. The intended effect of this proposed action is to make federally enforceable the revised portions of Colorado’s Regulation 1 that EPA is proposing to approve and to disapprove portions of the regulation that EPA deems are not consistent with the Clean Air Act. This action is being taken under section 110 of the Clean Air Act. DATES: Comments must be received on or before August 20, 2010. ADDRESSES: Submit your comments, identified by Docket ID No. EPA–R08– OAR–2007–1033, by one of the following methods: • https://www.regulations.gov. Follow the on-line instructions for submitting comments. • E-mail: komp.mark@epa.gov. • Fax: (303) 312–6064 (please alert the individual listed in the FOR FURTHER INFORMATION CONTACT if you are faxing comments). • Mail: Callie Videtich, Director, Air Program, Environmental Protection Agency (EPA), Region 8, Mailcode 8P– AR, 1595 Wynkoop Street, Denver, Colorado 80202–1129. • Hand Delivery: Callie Videtich, Director, Air Program, Environmental Protection Agency (EPA), Region 8, Mailcode 8P–AR, 1595 Wynkoop Street, Denver, Colorado 80202–1129. Such deliveries are only accepted Monday through Friday, 8 a.m. to 4:30 p.m., excluding Federal holidays. Special arrangements should be made for deliveries of boxed information. Instructions: Direct your comments to Docket ID No. EPA–R08–OAR–2007– 1033. EPA’s policy is that all comments received will be included in the public docket without change and may be made available online at www.regulations.gov, including any personal information provided, unless the comment includes information claimed to be Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Do not submit information that you consider to be CBI or otherwise protected through www.regulations.gov or e-mail. The www.regulations.gov Web site is an ‘‘anonymous access’’ system, which means EPA will not know your identity or contact information unless SUMMARY: PART 39—AIRWORTHINESS DIRECTIVES PO 00000 Frm 00004 Fmt 4702 Sfmt 4702 you provide it in the body of your comment. If you send an e-mail comment directly to EPA, without going through www.regulations.gov your email address will be automatically captured and included as part of the comment that is placed in the public docket and made available on the Internet. If you submit an electronic comment, EPA recommends that you include your name and other contact information in the body of your comment and with any disk or CD–ROM you submit. If EPA cannot read your comment due to technical difficulties and cannot contact you for clarification, EPA may not be able to consider your comment. Electronic files should avoid the use of special characters, any form of encryption, and be free of any defects or viruses. For additional information about EPA’s public docket visit the EPA Docket Center homepage at https:// www.epa.gov/epahome/dockets.htm. For additional instructions on submitting comments, go to Section I. General Information of the SUPPLEMENTARY INFORMATION section of this document. Docket: All documents in the docket are listed in the www.regulations.gov index. Although listed in the index, some information is not publicly available, e.g., CBI or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, will be publicly available only in hard copy. Publicly available docket materials are available either electronically in www.regulations.gov or in hard copy at the Air Program, Environmental Protection Agency (EPA), Region 8, 1595 Wynkoop Street, Denver, Colorado 80202–1129. EPA requests that if at all possible, you contact the individual listed in the FOR FURTHER INFORMATION CONTACT section to view the hard copy of the docket. You may view the hard copy of the docket Monday through Friday, 8 a.m. to 4 p.m., excluding Federal holidays. FOR FURTHER INFORMATION CONTACT: Mark Komp, U. S. Environmental Protection Agency, Region 8, Air Program, Mail Code 8P–AR, 1595 Wynkoop Street, Denver, Colorado 80202–1129, (303) 312–6022, komp.mark@epa.gov. SUPPLEMENTARY INFORMATION: Table of Contents I. General Information II. What is the purpose of this action? III. Background Information Regarding Colorado’s Submittal IV. EPA’s Evaluation of State’s Submittal V. Consideration of Section 110(l) of the CAA VI. Proposed Action E:\FR\FM\21JYP1.SGM 21JYP1

Agencies

[Federal Register Volume 75, Number 139 (Wednesday, July 21, 2010)]
[Proposed Rules]
[Pages 42340-42342]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2010-17756]


=======================================================================
-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0720; Directorate Identifier 2010-SW-050-AD]
RIN 2120-AA64


Airworthiness Directives; Sikorsky Aircraft Corporation 
(Sikorsky) Model S-92A Helicopters

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: This document proposes adopting a new airworthiness directive 
(AD) for Sikorsky Model S-92A helicopters. This proposal would require 
revising the airworthiness limitations section of the Instructions

[[Page 42341]]

for Continued Airworthiness (ICA) to reduce the life limit of the main 
gearbox housing and replacing any main gearbox housing that exceeds the 
life limit. This proposal is prompted by a fatigue analysis conducted 
after a helicopter was found with a severed main gearbox mounting foot 
pad (foot pad) that failed due to fatigue. The actions specified by 
this proposed AD are intended to prevent failure of the main gearbox 
mounting housing foot pad, loss of the main gearbox, and subsequent 
loss of control of the helicopter.

DATES: Comments must be received on or before September 20, 2010.

ADDRESSES: Use one of the following addresses to submit comments on 
this proposed AD:
     Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments.
     Fax: 202-493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590.
     Hand Delivery: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays.
    You may examine the comments to this proposed AD in the AD docket 
on the Internet at https://www.regulations.gov.

FOR FURTHER INFORMATION CONTACT: Michael Schwetz, Aviation Safety 
Engineer, Boston Aircraft Certification Office, 12 New England 
Executive Park, Burlington, MA 01803, telephone (781) 238-7761, fax 
(781) 238-7170.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to submit any written data, views, or arguments 
regarding this proposed AD. Send your comments to the address listed 
under the caption ADDRESSES. Include the docket number ``FAA-2010-0720, 
Directorate Identifier 2010-SW-050-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of the proposed AD. We will 
consider all comments received by the closing date and may amend the 
proposed AD in light of those comments.
    We will post all comments we receive, without change, to https://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact 
with FAA personnel concerning this proposed rulemaking. Using the 
search function of our docket web site, you can find and read the 
comments to any of our dockets, including the name of the individual 
who sent or signed the comment. You may review the DOT's complete 
Privacy Act Statement in the Federal Register published on April 11, 
2000 (65 FR 19477-78).

Examining the Docket

    You may examine the docket that contains the proposed AD, any 
comments, and other information in person at the Docket Operations 
office between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The Docket Operations office (telephone (800) 647-5527) is 
located in Room W12-140 on the ground floor of the West Building at the 
street address stated in the ADDRESSES section. Comments will be 
available in the AD docket shortly after receipt.

Discussion

    This document proposes adopting a new AD for Sikorsky Model S-92A 
helicopters. This proposal would require revising the airworthiness 
limitations section of the ICA to reduce the life limit of the main 
gearbox housing from 2700 hours time-in-service (TIS) to 1000 hours TIS 
and to replace any main gearbox housing that exceeds the lower life 
limit. This proposal is prompted by review of a fatigue analysis 
conducted after a helicopter was found with a severed foot pad due to 
the effect of fatigue of the main gearbox housing. This condition, if 
not corrected, could result in failure of the main gearbox housing 
mounting foot pad, loss of the main gearbox, and subsequent loss of 
control of the helicopter.
    This unsafe condition is likely to exist or develop on other 
helicopters of the same type design. Therefore, the proposed AD would 
require, within 60 days, revising the airworthiness limitations section 
of the ICA to reduce the life limit of the main gearbox housing from 
2700 hours TIS to 1000 hours TIS and replacing, before further flight, 
any main gearbox housing that has exceeded the 1000-hour TIS life 
limit.
    We estimate that this proposed AD would affect 15 helicopters of 
U.S. registry, and the proposed actions would take about 112 work hours 
per helicopter at an average labor rate of $85 per work hour. Required 
parts would cost about $200,000 per helicopter. Based on these figures, 
we estimate the total cost impact of the proposed AD on U.S. operators 
would be $3,142,800, assuming all 15 helicopters replace the main 
gearbox housing.

Regulatory Findings

    We have determined that this proposed AD would not have federalism 
implications under Executive Order 13132. Additionally, 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 that the 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 draft economic evaluation of the estimated costs to 
comply with this proposed AD. See the AD docket to examine the draft 
economic evaluation.

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.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

    Accordingly, pursuant to the authority delegated to me by the 
Administrator, the Federal Aviation Administration proposes to amend 
part 39 of the Federal Aviation Regulations (14 CFR part 39) as 
follows:

[[Page 42342]]

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.


Sec.  39.13  [Amended]

    2. Section 39.13 is amended by adding a new airworthiness directive 
to read as follows:

Sikorsky Aircraft Corporation: Docket No. FAA-2010-0720; Directorate 
Identifier 2010-SW-050-AD.

    Applicability: Model S-92A helicopters, with main gearbox 
housing, part number 92351-15110-042, -043, -044, or -045, 
installed, certificated in any category.
    Compliance: Required as indicated, unless done previously.
    To prevent failure of the main gearbox housing mounting foot 
pad, loss of the main gearbox, and subsequent loss of control of the 
helicopter, do the following:
    (a) Within 60 days, revise the airworthiness limitations section 
of the Instructions for Continued Airworthiness by reducing the life 
limits of the affected main gearbox housing from 2700 hours time-in-
service (TIS) to 1000 hours TIS.
    (b) After revising the life limit in accordance with paragraph 
(a) of this AD, before further flight, replace any main gearbox 
housing that exceeds the life limit of 1000 hours TIS.
    (c) To request a different method of compliance or a different 
compliance time for this AD, follow the procedures in 14 CFR 39.19. 
Contact the Manager, Boston Aircraft Certification Office, FAA, 
Attn: Michael Schwetz, Aviation Safety Engineer, 12 New England 
Executive Park, Burlington, MA 01803, telephone (781) 238-7761, fax 
(781) 238-7170, for information about previously approved 
alternative methods of compliance.
    (d) The Joint Aircraft System/Component (JASC) Code is 6320: 
Main Rotor Gearbox.

    Issued in Fort Worth, Texas, on July 13, 2010.
Mark R. Schilling,
Acting Manager, Rotorcraft Directorate, Aircraft Certification Service.
[FR Doc. 2010-17756 Filed 7-20-10; 8:45 am]
BILLING CODE 4910-13-P
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