Airworthiness Directives; British Aerospace Regional Aircraft ModelHP. 137 Jetstream MK 1, Jetstream Series 200, 3100, and 3200 Airplanes, 16790-16792 [E8-6509]

Download as PDF 16790 Federal Register / Vol. 73, No. 62 / Monday, March 31, 2008 / Proposed Rules DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2008–0369; Directorate Identifier 2008–CE–015–AD] RIN 2120–AA64 Airworthiness Directives; British Aerospace Regional Aircraft Model HP. 137 Jetstream MK 1, Jetstream Series 200, 3100, and 3200 Airplanes Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Notice of proposed rulemaking (NPRM). AGENCY: 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 product. The MCAI describes the unsafe condition as: jlentini on PROD1PC65 with PROPOSALS A failure mode has been identified following the examination of parts from another aircraft type (Jetstream 4100 series) that can lead to the loss of a nose-wheel. The Jetstream (HP.137) Mk1, 200, 3100 and 200 series use a similar method for retaining the wheel assemblies on the landing gear axle and can therefore experience the same type of failure, i.e. a combination of excessive wear and/or adverse tolerances on the axle inner cone, outer cone or wheel hub splined sleeve cones resulting in the loss of the critical gap between the inner flange face of the wheel outer cone and the axle end face. If this gap is lost, it results in the wheel having free play along the length of the axle. This condition, if not corrected, can cause the wheel nut lock plate to break, leading to the wheel retention nut unscrewing and subsequent separation of the nose wheel from the landing gear axle. 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 April 30, 2008. ADDRESSES: You may send comments by any of the following methods: • 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– VerDate Aug<31>2005 16:12 Mar 28, 2008 Jkt 214001 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. Examining the AD Docket You may examine the AD docket on the Internet at https:// 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 this proposed AD, 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. FOR FURTHER INFORMATION CONTACT: Taylor Martin, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329– 4138; fax: (816) 329–4090. SUPPLEMENTARY INFORMATION: 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–2008–0369; Directorate Identifier 2008–CE–015–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 https:// www.regulations.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 AD No: 2008– 0037, dated February 22, 2008 (referred to after this as ‘‘the MCAI’’), to correct an unsafe condition for the specified products. The MCAI states: A failure mode has been identified following the examination of parts from another aircraft type (Jetstream 4100 series) that can lead to the loss of a nose-wheel. The Jetstream (HP.137) Mk1, 200, 3100 and 3200 series use a similar method for retaining the wheel assemblies on the landing gear axle PO 00000 Frm 00012 Fmt 4702 Sfmt 4702 and can therefore experience the same type of failure, i.e. a combination of excessive wear and/or adverse tolerances on the axle inner cone, outer cone or wheel hub splined sleeve cones resulting in the loss of the critical gap between the inner flange face of the wheel outer cone and the axle end face. If this gap is lost, it results in the wheel having free play along the length of the axle. This condition, if not corrected, can cause the wheel nut lock plate to break, leading to the wheel retention nut unscrewing and subsequent separation of the nose wheel from the landing gear axle. For the reasons described above, this AD requires repetitive inspections of the nose landing gear to ensure that the wheels are correctly retained and, depending on findings, replacement of worn parts. You may obtain further information by examining the MCAI in the AD docket. Relevant Service Information British Aerospace Regional Aircraft has issued British Aerospace Jetstream Series 3100 and 3200 Service Bulletin 32–JA070241, dated July 13, 2007. 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. E:\FR\FM\31MRP1.SGM 31MRP1 Federal Register / Vol. 73, No. 62 / Monday, March 31, 2008 / Proposed Rules Costs of Compliance We estimate that this proposed AD will affect 190 products of U.S. registry. We also estimate that it would take about 1 work-hour per product to comply with the basic requirements of this proposed AD. The average labor rate is $80 per work-hour. Based on these figures, we estimate the cost of the proposed AD on U.S. operators to be $15,200, or $80 per product. In addition, we estimate that any necessary follow-on actions would take about 1 work-hour and require parts costing $250, for a cost of $330 per product. We have no way of determining the number of products that may need these actions. 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. jlentini on PROD1PC65 with PROPOSALS 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. VerDate Aug<31>2005 16:12 Mar 28, 2008 Jkt 214001 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 [Amended] 2. The FAA amends § 39.13 by adding the following new AD: British Aerospace Regional Aircraft: Docket No. FAA–2008–0369; Directorate Identifier 2008–CE–015–AD. Comments Due Date (a) We must receive comments by April 30, 2008. Affected ADs (b) None. Applicability (c) This AD applies to Model HP. 137 Jetstream MK 1, Jetstream Series 200, 3100, and 3200 airplanes, all serial numbers, certificated in any category. Subject (d) Air Transport Association of America (ATA) Code 32: Landing Gear. Reason (e) The mandatory continuing airworthiness information (MCAI) states: A failure mode has been identified following the examination of parts from another aircraft type (Jetstream 4100 series) that can lead to the loss of a nose wheel. The Jetstream (HP.137) Mk1, 200, 3100 and 3200 series use a similar method for retaining the wheel assemblies on the landing gear axle and can therefore experience the same type of failure, i.e. a combination of excessive wear and/or adverse tolerances on the axle inner cone, outer cone or wheel hub splined sleeve cones resulting in the loss of the critical gap between the inner flange face of the wheel outer cone and the axle end face. If this gap is lost, it results in the wheel having free play along the length of the axle. This condition, if not corrected, can cause the wheel nut lock plate to break, leading to the wheel retention nut unscrewing and subsequent separation of the nose wheel from the landing gear axle. For the reasons described above, this AD requires repetitive inspections of the nose landing gear to ensure that the wheels are correctly retained and, depending on findings, replacement of worn parts. PO 00000 Frm 00013 Fmt 4702 Sfmt 4702 16791 Actions and Compliance (f) Unless already done, do the following actions: (1) Within the next 3 months after the effective date of this AD, initially inspect the left and right nose wheel attachments to the axle following British Aerospace Jetstream Series 3100 and 3200 Service Bulletin 32– JA070241, dated July 13, 2007. (2) Repetitively thereafter inspect the left and right nose wheel attachments to the axle at the intervals specified in Table 1 of this AD following British Aerospace Jetstream Series 3100 and 3200 Service Bulletin 32– JA070241, dated July 13, 2007. If during any repetitive inspection the gap measurement changes from the previous inspection measurement, adjust the repetitive inspection interval as necessary based on Table 1 of this AD. TABLE 1.—REPETITIVE INSPECTION INTERVALS If the measured gap size is: Then repetitively inspect at the following intervals: 0.002 to 0.005 inches (0.05 to 0.13 mm). More than 0.005 to 0.010 inches (0.13 to 0.25 mm). More than 0.010 to 0.020 inches (0.25 to 0.51 mm). More than 0.020 inches (0.51 mm). Within 500 hours TIS. Within 1,000 hours TIS. Within 2,000 hours TIS. Within 3,000 hours TIS. (3) Before further flight, if during any of the inspections required in paragraphs (f)(1) or (f)(2) of this AD you find the gap between the inner flange of the outer cone and the axle end face is less than 0.002 inches (0.05 mm), replace all worn parts. Note 1: Replacement of parts does not constitute terminating action for the inspection requirements of this AD. FAA AD Differences Note 2: 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: Taylor Martin, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329–4138; fax: (816) 329– 4090. 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 E:\FR\FM\31MRP1.SGM 31MRP1 16792 Federal Register / Vol. 73, No. 62 / Monday, March 31, 2008 / Proposed Rules 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: 2008–0037, dated February 22, 2008; and British Aerospace Jetstream Series 3100 and 3200 Service Bulletin 32–JA070241, dated July 13, 2007, for related information. Issued in Kansas City, Missouri, on March 21, 2008. David R. Showers, Acting Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. E8–6509 Filed 3–28–08; 8:45 am] BILLING CODE 4910–13–P https://www.regulations.gov. You may review the public docket containing the proposal, any comments received, and any final disposition in person in the Dockets Office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Office (telephone 1–800–647–5527) is on the plaza level of the Department of Transportation, NASSIF Building, at the above address. An informal docket may also be examined during normal business hours at the office of the Manager, Safety, Alaska Flight Service Operations, Federal Aviation Administration, 222 West 7th Avenue, Box 14, Anchorage, AK 99513–7587. Gary Rolf, Federal Aviation Administration, 222 West 7th Avenue, Box 14, Anchorage, AK 99513–7587; telephone number (907) 271–5898; fax: (907) 271– 2850; e-mail: gary.ctr.rolf@faa.gov. Internet address: https:// www.alaska.faa.gov/at. FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 71 [Docket No. FAA–2008–0171; Airspace Docket No. 08–AAL–5] Proposed Revision of Class E Airspace; Deadhorse, AK Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking. jlentini on PROD1PC65 with PROPOSALS AGENCY: SUMMARY: This action proposes to revise Class E airspace at Deadhorse, AK. Eight Standard Instrument Approach Procedures (SIAPs) and a textual Departure Procedure (DP) are being amended for the Deadhorse Airport at Deadhorse, AK. Adoption of this proposal would result in revision of Class E airspace upward from the surface, and from 700 feet (ft.) and 1,200 ft. above the surface at the Deadhorse Airport, Deadhorse, AK. DATES: Comments must be received on or before May 15, 2008. ADDRESSES: Send comments on the proposal to the Docket Management Facility, U.S. Department of Transportation, 1200 New Jersey Avenue, SE., West Building Ground Floor, Room W12–140, Washington, DC 20590–0001. You must identify the docket number FAA–2008–0171/ Airspace Docket No. 08–AAL–5, at the beginning of your comments. You may also submit comments on the Internet at VerDate Aug<31>2005 16:12 Mar 28, 2008 Jkt 214001 Comments Invited Interested parties are invited to participate in this proposed rulemaking by submitting such written data, views, or arguments as they may desire. Comments that provide the factual basis supporting the views and suggestions presented are particularly helpful in developing reasoned regulatory decisions on the proposal. Comments are specifically invited on the overall regulatory, aeronautical, economic, environmental, and energy-related aspects of the proposal. Communications should identify both docket numbers and be submitted in triplicate to the address listed above. Commenters wishing the FAA to acknowledge receipt of their comments on this notice must submit with those comments a self-addressed, stamped postcard on which the following statement is made: ‘‘Comments to Docket No. FAA–2008–0171/Airspace Docket No. 08–AAL–5.’’ The postcard will be date/time stamped and returned to the commenter. All communications received on or before the specified closing date for comments will be considered before taking action on the proposed rule. The proposal contained in this notice may be changed in light of comments received. All comments submitted will be available for examination in the public docket both before and after the closing date for comments. A report summarizing each substantive public contact with FAA personnel concerned PO 00000 Frm 00014 Fmt 4702 Sfmt 4702 with this rulemaking will be filed in the docket. Availability of Notice of Proposed Rulemaking’s (NPRM’s) An electronic copy of this document may be downloaded through the Internet at https://www.regulations.gov. Recently published rulemaking documents can also be accessed through the FAA’s Web page at https:// www.faa.gov or the Superintendent of Document’s Web page at https:// www.access.gpo.gov/nara/. Additionally, any person may obtain a copy of this notice by submitting a request to the Federal Aviation Administration, Office of Air Traffic Airspace Management, ATA–400, 800 Independence Avenue, SW., Washington, DC 20591 or by calling (202) 267–8783. Communications must identify both docket numbers for this notice. Persons interested in being placed on a mailing list for future NPRM’s should contact the FAA’s Office of Rulemaking, (202) 267–9677, to request a copy of Advisory Circular No. 11–2A, Notice of Proposed Rulemaking Distribution System, which describes the application procedure. The Proposal The FAA is considering an amendment to the Code of Federal Regulations (14 CFR part 71), which would revise Class E airspace at the Deadhorse Airport, in Deadhorse, AK. The intended effect of this proposal is to revise Class E airspace upward from the surface, and from 700 ft. and 1,200 ft. above the surface to contain Instrument Flight Rules (IFR) operations at the Deadhorse Airport, Deadhorse, AK. The FAA Instrument Flight Procedures Production and Maintenance Branch has amended eight SIAPs and a DP for the Deadhorse Airport. The approaches are (1) the Area Navigation (RNAV) Global Positioning System (GPS) Runway (RWY) 05, Amendment (Amdt) 1, (2) the RNAV (GPS) RWY 23, Amdt 1, (3) the Localizer (LOC)/Distance Measuring Equipment (DME) Backcourse (BC) RWY 23, Amdt 11, (4) the Instrument Landing System (ILS) or LOC/DME RWY 05, Amdt 2, (5) the Very High Frequency Omnidirectional Range (VOR)/DME RWY 05, Amdt 2, (6) the VOR/DME RWY 23, Amdt 4, (7) the VOR RWY 05, Amdt 4, and (8) the VOR RWY 23, Amdt 6. Textual DP’s are unnamed and are published in the front of the U.S. Terminal Procedures for Alaska. Class E controlled airspace extending upward from the surface, and from 700 ft. and 1,200 ft. above the surface in the E:\FR\FM\31MRP1.SGM 31MRP1

Agencies

[Federal Register Volume 73, Number 62 (Monday, March 31, 2008)]
[Proposed Rules]
[Pages 16790-16792]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E8-6509]



[[Page 16790]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0369; Directorate Identifier 2008-CE-015-AD]
RIN 2120-AA64


Airworthiness Directives; British Aerospace Regional Aircraft 
Model HP. 137 Jetstream MK 1, Jetstream Series 200, 3100, and 3200 
Airplanes

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 product. The MCAI describes the unsafe 
condition as:

    A failure mode has been identified following the examination of 
parts from another aircraft type (Jetstream 4100 series) that can 
lead to the loss of a nose-wheel. The Jetstream (HP.137) Mk1, 200, 
3100 and 200 series use a similar method for retaining the wheel 
assemblies on the landing gear axle and can therefore experience the 
same type of failure, i.e. a combination of excessive wear and/or 
adverse tolerances on the axle inner cone, outer cone or wheel hub 
splined sleeve cones resulting in the loss of the critical gap 
between the inner flange face of the wheel outer cone and the axle 
end face. If this gap is lost, it results in the wheel having free 
play along the length of the axle. This condition, if not corrected, 
can cause the wheel nut lock plate to break, leading to the wheel 
retention nut unscrewing and subsequent separation of the nose wheel 
from the landing gear axle.

    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 April 30, 2008.

ADDRESSES: You may send comments by any of the following methods:
     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.

Examining the AD Docket

    You may examine the AD docket on the Internet at https://
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 this proposed AD, 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.

FOR FURTHER INFORMATION CONTACT: Taylor Martin, Aerospace Engineer, 
FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, 
Missouri 64106; telephone: (816) 329-4138; fax: (816) 329-4090.

SUPPLEMENTARY INFORMATION:

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-2008-0369; 
Directorate Identifier 2008-CE-015-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 https://
www.regulations.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 AD 
No: 2008-0037, dated February 22, 2008 (referred to after this as ``the 
MCAI''), to correct an unsafe condition for the specified products. The 
MCAI states:

    A failure mode has been identified following the examination of 
parts from another aircraft type (Jetstream 4100 series) that can 
lead to the loss of a nose-wheel. The Jetstream (HP.137) Mk1, 200, 
3100 and 3200 series use a similar method for retaining the wheel 
assemblies on the landing gear axle and can therefore experience the 
same type of failure, i.e. a combination of excessive wear and/or 
adverse tolerances on the axle inner cone, outer cone or wheel hub 
splined sleeve cones resulting in the loss of the critical gap 
between the inner flange face of the wheel outer cone and the axle 
end face. If this gap is lost, it results in the wheel having free 
play along the length of the axle. This condition, if not corrected, 
can cause the wheel nut lock plate to break, leading to the wheel 
retention nut unscrewing and subsequent separation of the nose wheel 
from the landing gear axle.
    For the reasons described above, this AD requires repetitive 
inspections of the nose landing gear to ensure that the wheels are 
correctly retained and, depending on findings, replacement of worn 
parts.

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

Relevant Service Information

    British Aerospace Regional Aircraft has issued British Aerospace 
Jetstream Series 3100 and 3200 Service Bulletin 32-JA070241, dated July 
13, 2007. 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.

[[Page 16791]]

Costs of Compliance

    We estimate that this proposed AD will affect 190 products of U.S. 
registry. We also estimate that it would take about 1 work-hour per 
product to comply with the basic requirements of this proposed AD. The 
average labor rate is $80 per work-hour.
    Based on these figures, we estimate the cost of the proposed AD on 
U.S. operators to be $15,200, or $80 per product.
    In addition, we estimate that any necessary follow-on actions would 
take about 1 work-hour and require parts costing $250, for a cost of 
$330 per product. We have no way of determining the number of products 
that may need these actions.

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.


Sec.  39.13  [Amended]

    2. The FAA amends Sec.  39.13 by adding the following new AD:

British Aerospace Regional Aircraft: Docket No. FAA-2008-0369; 
Directorate Identifier 2008-CE-015-AD.

Comments Due Date

    (a) We must receive comments by April 30, 2008.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Model HP. 137 Jetstream MK 1, Jetstream 
Series 200, 3100, and 3200 airplanes, all serial numbers, 
certificated in any category.

Subject

    (d) Air Transport Association of America (ATA) Code 32: Landing 
Gear.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:
    A failure mode has been identified following the examination of 
parts from another aircraft type (Jetstream 4100 series) that can 
lead to the loss of a nose wheel. The Jetstream (HP.137) Mk1, 200, 
3100 and 3200 series use a similar method for retaining the wheel 
assemblies on the landing gear axle and can therefore experience the 
same type of failure, i.e. a combination of excessive wear and/or 
adverse tolerances on the axle inner cone, outer cone or wheel hub 
splined sleeve cones resulting in the loss of the critical gap 
between the inner flange face of the wheel outer cone and the axle 
end face. If this gap is lost, it results in the wheel having free 
play along the length of the axle. This condition, if not corrected, 
can cause the wheel nut lock plate to break, leading to the wheel 
retention nut unscrewing and subsequent separation of the nose wheel 
from the landing gear axle.
    For the reasons described above, this AD requires repetitive 
inspections of the nose landing gear to ensure that the wheels are 
correctly retained and, depending on findings, replacement of worn 
parts.

Actions and Compliance

    (f) Unless already done, do the following actions:
    (1) Within the next 3 months after the effective date of this 
AD, initially inspect the left and right nose wheel attachments to 
the axle following British Aerospace Jetstream Series 3100 and 3200 
Service Bulletin 32-JA070241, dated July 13, 2007.
    (2) Repetitively thereafter inspect the left and right nose 
wheel attachments to the axle at the intervals specified in Table 1 
of this AD following British Aerospace Jetstream Series 3100 and 
3200 Service Bulletin 32-JA070241, dated July 13, 2007. If during 
any repetitive inspection the gap measurement changes from the 
previous inspection measurement, adjust the repetitive inspection 
interval as necessary based on Table 1 of this AD.

                Table 1.--Repetitive Inspection Intervals
------------------------------------------------------------------------
                                            Then repetitively inspect at
       If the measured gap size is:           the following intervals:
------------------------------------------------------------------------
0.002 to 0.005 inches (0.05 to 0.13 mm)...  Within 500 hours TIS.
More than 0.005 to 0.010 inches (0.13 to    Within 1,000 hours TIS.
 0.25 mm).
More than 0.010 to 0.020 inches (0.25 to    Within 2,000 hours TIS.
 0.51 mm).
More than 0.020 inches (0.51 mm)..........  Within 3,000 hours TIS.
------------------------------------------------------------------------

    (3) Before further flight, if during any of the inspections 
required in paragraphs (f)(1) or (f)(2) of this AD you find the gap 
between the inner flange of the outer cone and the axle end face is 
less than 0.002 inches (0.05 mm), replace all worn parts.

    Note 1: Replacement of parts does not constitute terminating 
action for the inspection requirements of this AD.

FAA AD Differences

    Note 2: 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: Taylor Martin, Aerospace Engineer, FAA, Small 
Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 
64106; telephone: (816) 329-4138; fax: (816) 329-4090. 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

[[Page 16792]]

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: 
2008-0037, dated February 22, 2008; and British Aerospace Jetstream 
Series 3100 and 3200 Service Bulletin 32-JA070241, dated July 13, 
2007, for related information.

    Issued in Kansas City, Missouri, on March 21, 2008.
David R. Showers,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
 [FR Doc. E8-6509 Filed 3-28-08; 8:45 am]
BILLING CODE 4910-13-P
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