Airworthiness Directives; Bombardier Model DHC-8-400 Series Airplanes, 27476-27478 [E9-13505]

Download as PDF 27476 Federal Register / Vol. 74, No. 110 / Wednesday, June 10, 2009 / Proposed Rules FAA AD Differences ACTION: Notice of proposed rulemaking (NPRM). NOTE 1: This AD differs from the MCAI and/or service information as follows: No differences. Other FAA AD Provisions (h) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification 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: Christopher Alfano, Aerospace Engineer, Airframe and Mechanical Systems Branch, ANE–171, FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228–7340; fax (516) 794–5531. Before using any approved AMOC on any airplane to which the AMOC applies, notify your principal maintenance inspector (PMI) or principal avionics inspector (PAI), as appropriate, or lacking a principal inspector, your local Flight Standards District Office. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service. (3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act, the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120–0056. Related Information (i) Refer to MCAI Canadian Airworthiness Directive CF–2009–02, dated January 19, 2009; and Bombardier Service Bulletin 601R– 11–088, Revision ‘A,’ dated March 24, 2009; for related information. Issued in Renton, Washington, on June 2, 2009. Stephen P. Boyd, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E9–13506 Filed 6–9–09; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 erowe on PROD1PC63 with PROPOSALS-1 [Docket No. FAA–2009–0526; Directorate Identifier 2009–NM–029–AD] RIN 2120–AA64 Airworthiness Directives; Bombardier Model DHC–8–400 Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. VerDate Nov<24>2008 14:07 Jun 09, 2009 Jkt 217001 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: Four aircraft have experienced a dual AC generator shutdown, caused by a broken propeller de-ice bus bar which shortcircuited with the backplate assembly. * * * A short circuit can cause a dual AC generator shutdown that, particularly in conjunction with an engine failure in icing conditions, could result in reduced controllability of the aircraft. * * * * * Reduced controllability of the airplane in certain operating conditions affects continued safe flight and landing. 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 July 10, 2009. 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, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. For service information identified in this proposed AD, contact Bombardier, ˆ Inc., 400 Cote-Vertu Road West, Dorval, ´ Quebec H4S 1Y9, Canada; telephone 514–855–5000; fax 514–855–7401; email thd.qseries@aero.bombardier.com; Internet https://www.bombardier.com. You may review copies of the referenced service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington. For information on the availability of this material at the FAA, call 425–227–1221 or 425–227–1152. Examining the AD Docket You may examine the AD docket on the Internet at https:// www.regulations.gov; or in person at the Docket Operations office between 9 a.m. PO 00000 Frm 00021 Fmt 4702 Sfmt 4702 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 Operations 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: Wing Chan, Aerospace Engineer, Aerospace Engineer, Systems and Flight Test Branch, ANE–172, FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228– 7311; fax (516) 794–5531. 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–2009–0526; Directorate Identifier 2009–NM–029–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 based on 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 Transport Canada Civil Aviation (TCCA), which is the aviation authority for Canada, has issued Canadian Airworthiness Directive CF–2009–01, dated January 19, 2009 (referred to after this as ‘‘the MCAI’’), to correct an unsafe condition for the specified products. The MCAI states: Four aircraft have experienced a dual AC generator shutdown, caused by a broken propeller de-ice bus bar which shortcircuited with the backplate assembly. It was subsequently determined that any friction or contact between a propeller de-ice bus bar and the backplate assembly can cause an intermittent short circuit. Such a short circuit can cause a dual AC generator shutdown that, particularly in conjunction with an engine failure in icing conditions, could result in reduced controllability of the aircraft. This directive mandates revision of the Airplane Flight Manual (AFM) to introduce a procedure that restores AC power following a failure of No. 1 and No. 2 AC generators with propeller de-ice on. Additionally, in E:\FR\FM\10JNP1.SGM 10JNP1 Federal Register / Vol. 74, No. 110 / Wednesday, June 10, 2009 / Proposed Rules 27477 order to prevent similar dual AC generator shutdowns, it mandates the application of sealant as insulation between the propeller de-ice bus bars and the backplate assembly. proposed AD on U.S. operators to be $29,760, or $480 per product. PART 39—AIRWORTHINESS DIRECTIVES Authority for This Rulemaking Reduced controllability of the airplane in certain operating conditions affects continued safe flight and landing. You may obtain further information by examining the MCAI in the AD docket. 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. 1. The authority citation for part 39 continues to read as follows: Relevant Service Information Bombardier has issued Service Bulletin 84–61–03, Revision ‘A,’ dated September 18, 2008; and Bombardier Temporary Amendment (TA) 14, Issue 1, dated May 10, 2006, to the Dash 8 Q400 Airplane Flight Manual PSM 1– 84–1A. The actions described in this service information are intended to correct the unsafe condition identified in the MCAI. FAA’s Determination and Requirements of This 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 the State of Design Authority, we have been notified of the unsafe condition described in the MCAI and service information referenced above. We are proposing this AD because we evaluated all pertinent information and determined an unsafe condition exists and is likely to exist or develop on other products of the same type design. erowe on PROD1PC63 with PROPOSALS-1 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 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 affect about 62 products of U.S. registry. We also estimate that it would take about 6 work-hours 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 VerDate Nov<24>2008 14:07 Jun 09, 2009 Jkt 217001 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, Incorporation by reference, 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: PO 00000 Frm 00022 Fmt 4702 Sfmt 4702 Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new AD: Bombardier, Inc. (Formerly de Havilland, Inc.): Docket No. FAA–2009–0526; Directorate Identifier 2009–NM–029–AD. Comments Due Date (a) We must receive comments by July 10, 2009. Affected ADs (b) None. Applicability (c) This AD applies to Bombardier Model DHC–8–400, DHC–8–401, and DHC–8–402 airplanes, certificated in any category, serial numbers 4001, 4003, 4004, 4006, and 4008 through 4154 inclusive. Subject (d) Air Transport Association (ATA) of America Code 61: Propellers/Propulsors. Reason (e) The mandatory continuing airworthiness information (MCAI) states: Four aircraft have experienced a dual AC generator shutdown, caused by a broken propeller de-ice bus bar which shortcircuited with the backplate assembly. It was subsequently determined that any friction or contact between a propeller de-ice bus bar and the backplate assembly can cause an intermittent short circuit. Such a short circuit can cause a dual AC generator shutdown that, particularly in conjunction with an engine failure in icing conditions, could result in reduced controllability of the aircraft. This directive mandates revision of the Airplane Flight Manual (AFM) to introduce a procedure that restores AC power following a failure of No. 1 and No. 2 AC generators with propeller de-ice on. Additionally, in order to prevent similar dual AC generator shutdowns, it mandates the application of sealant as insulation between the propeller de-ice bus bars and the backplate assembly. Reduced controllability of the airplane in certain operating conditions affects continued safe flight and landing. Actions and Compliance (f) Unless already done, do the following actions. (1) Within 30 days after the effective date of this AD, revise the Limitations section of the AFM by inserting a copy of Bombardier Temporary Amendment (TA) 14, Issue 1, dated May 10, 2006, to the Dash 8 Q400 AFM PSM 1–84–1A. When the information in Bombardier TA 14, Issue 1, dated May 10, 2006, is included in the general revisions of the AFM, the general revisions may be inserted in the AFM and the TA may be removed. E:\FR\FM\10JNP1.SGM 10JNP1 27478 Federal Register / Vol. 74, No. 110 / Wednesday, June 10, 2009 / Proposed Rules (2) Within 5,000 flight hours after the effective date of this AD: Apply sealant between the bus bar assemblies and the backplate assembly by incorporating Modsum 4W163047, Revision B, dated August 11, 2008, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84–61–03, Revision ‘A,’ dated September 18, 2008. (3) Incorporating Bombardier DHC–8–S400 Modification Summary Package 4W163047 before the effective date of this AD in accordance with Bombardier Service Bulletin 84–61–03, dated April 27, 2007, is considered acceptable for compliance with the requirements of paragraph (f)(2) of this AD. FAA AD Differences Note 1: 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, New York Aircraft Certification Office (ACO), 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: Wing Chan, Aerospace Engineer, Aerospace Engineer, Systems and Flight Test Branch, ANE–172, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228–7311; fax (516) 794–5531. Before using any approved AMOC on any airplane to which the AMOC applies, notify your principal maintenance inspector (PMI) or principal avionics inspector (PAI), as appropriate, or lacking a principal inspector, your local Flight Standards District Office. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service. (3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act, the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120–0056. erowe on PROD1PC63 with PROPOSALS-1 Related Information (h) Refer to MCAI Canadian Airworthiness Directive CF–2009–01, dated January 19, 2009; and Bombardier Service Bulletin 84– 61–03, Revision ‘A,’ dated September 18, 2008; for related information. Issued in Renton, Washington, on June 2, 2009. Stephen P. Boyd, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E9–13505 Filed 6–9–09; 8:45 am] BILLING CODE 4910–13–P VerDate Nov<24>2008 14:07 Jun 09, 2009 Jkt 217001 DEPARTMENT OF HOMELAND SECURITY Coast Guard 33 CFR Part 100 [USCG–2009–0436] RIN 1625–AA08 Special Local Regulations; Great Lakes Annual Marine Events Coast Guard, DHS. Notice of proposed rulemaking. AGENCY: ACTION: SUMMARY: The Coast Guard proposes to amend special local regulations for annual regattas and marine parades in the Captain of the Port Buffalo zone. This action is necessary to protect the public and participants from hazards associated with regattas and marine parades. This proposed rule is intended to ensure safety of life on the navigable waters immediately prior to, during, and immediately after regattas or marine parades. DATES: Comments and related materials must reach the Coast Guard on or before July 10, 2009. ADDRESSES: You may submit comments identified by Coast Guard docket number USCG–2009–0436 to the Docket Management Facility at the U.S. Department of Transportation. To avoid duplication, please use only one of the following methods: (1) Online: https:// www.regulations.gov. (2) Mail: Docket Management Facility (M–30), U.S. Department of Transportation, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590– 0001. (3) Hand delivery: Room W12–140 on the Ground Floor of the West Building, 1200 New Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The telephone number is 202–366–9329. (4) Fax: 202–493–2251. FOR FURTHER INFORMATION CONTACT: CDR Joseph Boudrow, Prevention Dept. Chief, Sector Buffalo, 1 Fuhrmann Blvd., Buffalo, NY 14203; 716–843– 9385. SUPPLEMENTARY INFORMATION: I. Public Participation and Request for Comments We encourage you to participate in this rulemaking by submitting comments and related materials. All comments received will be posted, without change, to https:// PO 00000 Frm 00023 Fmt 4702 Sfmt 4702 www.regulations.gov and will include any personal information you have provided. We have an agreement with the Department of Transportation (DOT) to use the Docket Management Facility. Please see DOT’s ‘‘Privacy Act’’ paragraph below. A. Submitting Comments If you submit a comment, please include the docket number for this rulemaking (USCG–2009–0436), indicate the specific section of this document to which each comment applies, and give the reason for each comment. We recommend that you include your name, mailing address, and an e-mail address or other contact information in the body of your document to ensure that you can be identified as the submitter. This also allows us to contact you in the event further information is needed or if there are questions. For example, if we cannot read your submission due to technical difficulties and you cannot be contacted, your submission may not be considered. You may submit your comments and material by electronic means, mail, fax, or delivery to the Docket Management Facility at the address under ADDRESSES; but please submit your comments and material by only one means. If you submit them by mail or delivery, submit them in an unbound format, no larger than 81⁄2 by 11 inches, suitable for copying and electronic filing. If you submit them by mail and would like to know that they reached the Facility, please enclose a stamped, self-addressed postcard or envelope. We will consider all comments and material received during the comment period. We may change this proposed rule in view of them. B. Viewing Comments and Documents To view comments, as well as documents mentioned in this preamble as being available in the docket, go to https://www.regulations.gov at any time, click on ‘‘Search for Dockets,’’ and enter the docket number for this rulemaking (USCG–2009–0436) in the Docket ID box, and click enter. You may also visit the Docket Management Facility in Room W12–140 on the ground floor of the DOT West Building, 1200 New Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. C. Privacy Act Anyone can search the electronic form of all comments received into any of our dockets by the name of the individual submitting the comment (or signing the comment, if submitted on E:\FR\FM\10JNP1.SGM 10JNP1

Agencies

[Federal Register Volume 74, Number 110 (Wednesday, June 10, 2009)]
[Proposed Rules]
[Pages 27476-27478]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E9-13505]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2009-0526; Directorate Identifier 2009-NM-029-AD]
RIN 2120-AA64


Airworthiness Directives; Bombardier Model DHC-8-400 Series 
Airplanes

AGENCY: Federal Aviation Administration (FAA), 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:

    Four aircraft have experienced a dual AC generator shutdown, 
caused by a broken propeller de-ice bus bar which short-circuited 
with the backplate assembly.
    * * * A short circuit can cause a dual AC generator shutdown 
that, particularly in conjunction with an engine failure in icing 
conditions, could result in reduced controllability of the aircraft.
* * * * *
Reduced controllability of the airplane in certain operating conditions 
affects continued safe flight and landing. 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 July 10, 2009.

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, between 9 a.m. and 5 p.m., Monday 
through Friday, except Federal holidays.
    For service information identified in this proposed AD, contact 
Bombardier, Inc., 400 C[ocirc]te-Vertu Road West, Dorval, Qu[eacute]bec 
H4S 1Y9, Canada; telephone 514-855-5000; fax 514-855-7401; e-mail 
thd.qseries@aero.bombardier.com; Internet https://www.bombardier.com. 
You may review copies of the referenced service information at the FAA, 
Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, 
Washington. For information on the availability of this material at the 
FAA, call 425-227-1221 or 425-227-1152.

Examining the AD Docket

    You may examine the AD docket on the Internet at https://www.regulations.gov; or in person at the Docket Operations office 
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 Operations 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: Wing Chan, Aerospace Engineer, 
Aerospace Engineer, Systems and Flight Test Branch, ANE-172, FAA, New 
York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, 
Westbury, New York 11590; telephone (516) 228-7311; fax (516) 794-5531.

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-2009-0526; 
Directorate Identifier 2009-NM-029-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 based on 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

    Transport Canada Civil Aviation (TCCA), which is the aviation 
authority for Canada, has issued Canadian Airworthiness Directive CF-
2009-01, dated January 19, 2009 (referred to after this as ``the 
MCAI''), to correct an unsafe condition for the specified products. The 
MCAI states:

    Four aircraft have experienced a dual AC generator shutdown, 
caused by a broken propeller de-ice bus bar which short-circuited 
with the backplate assembly.
    It was subsequently determined that any friction or contact 
between a propeller de-ice bus bar and the backplate assembly can 
cause an intermittent short circuit. Such a short circuit can cause 
a dual AC generator shutdown that, particularly in conjunction with 
an engine failure in icing conditions, could result in reduced 
controllability of the aircraft.
    This directive mandates revision of the Airplane Flight Manual 
(AFM) to introduce a procedure that restores AC power following a 
failure of No. 1 and No. 2 AC generators with propeller de-ice on. 
Additionally, in

[[Page 27477]]

order to prevent similar dual AC generator shutdowns, it mandates 
the application of sealant as insulation between the propeller de-
ice bus bars and the backplate assembly.

Reduced controllability of the airplane in certain operating conditions 
affects continued safe flight and landing. You may obtain further 
information by examining the MCAI in the AD docket.

Relevant Service Information

    Bombardier has issued Service Bulletin 84-61-03, Revision `A,' 
dated September 18, 2008; and Bombardier Temporary Amendment (TA) 14, 
Issue 1, dated May 10, 2006, to the Dash 8 Q400 Airplane Flight Manual 
PSM 1-84-1A. The actions described in this service information are 
intended to correct the unsafe condition identified in the MCAI.

FAA's Determination and Requirements of This 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 the State of Design Authority, we have 
been notified of the unsafe condition described in the MCAI and service 
information referenced above. We are proposing this AD because we 
evaluated all pertinent information and determined an unsafe condition 
exists and is likely to exist or develop on other products of the same 
type design.

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 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 affect about 62 products of U.S. registry. We also estimate that 
it would take about 6 work-hours 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 $29,760, or $480 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, Incorporation by 
reference, 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:

Bombardier, Inc. (Formerly de Havilland, Inc.): Docket No. FAA-2009-
0526; Directorate Identifier 2009-NM-029-AD.

Comments Due Date

    (a) We must receive comments by July 10, 2009.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Bombardier Model DHC-8-400, DHC-8-401, 
and DHC-8-402 airplanes, certificated in any category, serial 
numbers 4001, 4003, 4004, 4006, and 4008 through 4154 inclusive.

Subject

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

Reason

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

    Four aircraft have experienced a dual AC generator shutdown, 
caused by a broken propeller de-ice bus bar which short-circuited 
with the backplate assembly.
    It was subsequently determined that any friction or contact 
between a propeller de-ice bus bar and the backplate assembly can 
cause an intermittent short circuit. Such a short circuit can cause 
a dual AC generator shutdown that, particularly in conjunction with 
an engine failure in icing conditions, could result in reduced 
controllability of the aircraft.
    This directive mandates revision of the Airplane Flight Manual 
(AFM) to introduce a procedure that restores AC power following a 
failure of No. 1 and No. 2 AC generators with propeller de-ice on. 
Additionally, in order to prevent similar dual AC generator 
shutdowns, it mandates the application of sealant as insulation 
between the propeller de-ice bus bars and the backplate assembly.

Reduced controllability of the airplane in certain operating 
conditions affects continued safe flight and landing.

Actions and Compliance

    (f) Unless already done, do the following actions.
    (1) Within 30 days after the effective date of this AD, revise 
the Limitations section of the AFM by inserting a copy of Bombardier 
Temporary Amendment (TA) 14, Issue 1, dated May 10, 2006, to the 
Dash 8 Q400 AFM PSM 1-84-1A. When the information in Bombardier TA 
14, Issue 1, dated May 10, 2006, is included in the general 
revisions of the AFM, the general revisions may be inserted in the 
AFM and the TA may be removed.

[[Page 27478]]

    (2) Within 5,000 flight hours after the effective date of this 
AD: Apply sealant between the bus bar assemblies and the backplate 
assembly by incorporating Modsum 4W163047, Revision B, dated August 
11, 2008, in accordance with the Accomplishment Instructions of 
Bombardier Service Bulletin 84-61-03, Revision `A,' dated September 
18, 2008.
    (3) Incorporating Bombardier DHC-8-S400 Modification Summary 
Package 4W163047 before the effective date of this AD in accordance 
with Bombardier Service Bulletin 84-61-03, dated April 27, 2007, is 
considered acceptable for compliance with the requirements of 
paragraph (f)(2) of this AD.

FAA AD Differences

    Note 1: 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, New 
York Aircraft Certification Office (ACO), 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: Wing Chan, Aerospace 
Engineer, Aerospace Engineer, Systems and Flight Test Branch, ANE-
172, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, 
New York 11590; telephone (516) 228-7311; fax (516) 794-5531. Before 
using any approved AMOC on any airplane to which the AMOC applies, 
notify your principal maintenance inspector (PMI) or principal 
avionics inspector (PAI), as appropriate, or lacking a principal 
inspector, your local Flight Standards District Office.
    (2) Airworthy Product: For any requirement in this AD to obtain 
corrective actions from a manufacturer or other source, use these 
actions if they are FAA-approved. Corrective actions are considered 
FAA-approved if they are approved by the State of Design Authority 
(or their delegated agent). You are required to assure the product 
is airworthy before it is returned to service.
    (3) Reporting Requirements: For any reporting requirement in 
this AD, under the provisions of the Paperwork Reduction Act, the 
Office of Management and Budget (OMB) has approved the information 
collection requirements and has assigned OMB Control Number 2120-
0056.

Related Information

    (h) Refer to MCAI Canadian Airworthiness Directive CF-2009-01, 
dated January 19, 2009; and Bombardier Service Bulletin 84-61-03, 
Revision `A,' dated September 18, 2008; for related information.

    Issued in Renton, Washington, on June 2, 2009.
Stephen P. Boyd,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. E9-13505 Filed 6-9-09; 8:45 am]
BILLING CODE 4910-13-P
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