Airworthiness Directives; Bombardier Model DHC-8-102, DHC-8-103, DHC-8-106, DHC-8-201, DHC-8-202, DHC-8-301, DHC-8-311, and DHC-8-315 Airplanes, 9055-9058 [E8-3000]

Download as PDF Federal Register / Vol. 73, No. 33 / Tuesday, February 19, 2008 / Proposed Rules Note 1: This AD requires revisions to certain operator maintenance documents to include new inspections. Compliance with these inspections is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by these inspections, the operator may not be able to accomplish the inspections described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance according to paragraph (g) of this AD. The request should include a description of changes to the required inspections that will ensure the continued operational safety of the airplane. Subject (d) Air Transport Association (ATA) of America Code 28: Fuel. Reason rwilkins on PROD1PC63 with PROPOSALS (e) The mandatory continuing airworthiness information (MCAI) states: Bombardier Aerospace has completed a system safety review of the aircraft fuel system against fuel tank standards introduced in Chapter 525 of the Airworthiness Manual through Notice of Proposed Amendment (NPA) 2002–043. The identified non-compliances were then assessed using Transport Canada Policy Letter No. 525–001, to determine if mandatory corrective action is required. The assessment showed that supplemental maintenance tasks [inspections of various fuel system components such as shields, harnesses, sleeves, and sealant] are required to prevent potential ignition sources inside the fuel system, which could result in a fuel tank explosion. Revision has been made to Part 2 ‘‘Airworthiness Limitation Items’’ of the DHC–8–400 Maintenance Requirements Manual to introduce the required maintenance tasks. The corrective action is revising the Airworthiness Limitations Section of the Instructions for Continued Airworthiness to incorporate new limitations for fuel tank systems. Actions and Compliance (f) Unless already done, do the following actions. (1) Within 60 days after the effective date of this AD, or before December 16, 2008, whichever occurs first, revise the ALS of the Instructions for Continued Airworthiness to incorporate the inspection requirements of Bombardier Temporary Revision ALI–69, dated February 9, 2007, to Section 4, ‘‘Fuel System Limitations,’’ of Part 2, ‘‘Airworthiness Limitations Items,’’ of the Bombardier Dash 8 Q400 Maintenance Requirements Manual Product Support Manual (PSM) 1–84–7 (‘‘the TR to the MRM’’). For all fuel system limitations tasks contained in the TR to the MRM, the initial compliance times start from the later of the times specified in paragraphs (f)(1)(i) and (f)(1)(ii) of this AD, and the repetitive inspections must be accomplished thereafter at the interval specified in the TR to the MRM, except as provided by paragraphs (f)(2) and (g)(1) of this AD. VerDate Aug<31>2005 16:24 Feb 15, 2008 Jkt 214001 Note 2 : The actions required by paragraph (f)(1) of this AD may be done by inserting a copy of Bombardier TR ALI–69 into the Airworthiness Limitations section of the Dash 8 Q400 MRM 1–84–7. When this TR has been included in general revisions of the MRM, the general revisions may be inserted in the PSM, provided the relevant information in the general revision is identical to that in Bombardier TR ALI–69. (i) The effective date of this AD. (ii) The date of issuance of the original Canadian standard airworthiness certificate or the date of issuance of the original Canadian export certificate of airworthiness. (2) After accomplishing the actions specified in paragraph (f)(1) of this AD, no alternative inspections or inspection intervals may be used unless the inspections or inspection intervals are part of a later revision of Bombardier Dash 8 Q400 MRM, PSM 1–84–7, Revision 4, dated October 30, 2003, that is approved by the Manager, New York Aircraft Certification Office (ACO), FAA, or Transport Canada Civil Aviation (TCCA) (or its delegated agent); or unless the inspections or inspection intervals are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (g)(1) of this AD. FAA AD Differences Note 3: 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 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: Rocco Viselli, Aerospace Engineer, Airframe and Propulsion Branch, ANE–171, FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228–7331; fax (516) 794–5531. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAAapproved 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–2007–33, dated December 17, PO 00000 Frm 00003 Fmt 4702 Sfmt 4702 9055 2007, and Temporary Revision ALI–69, dated February 9, 2007, to Section 4, ‘‘Fuel System Limitations,’’ of Part 2, ‘‘Airworthiness Limitations Items’’ (AWL), of the Bombardier Dash 8 Q400 Maintenance Requirements Manual Product Support Manual (PSM) 1– 84–7. Issued in Renton, Washington, on February 11, 2008. Stephen P. Boyd, Assistant Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E8–2997 Filed 2–15–08; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2008–0179; Directorate Identifier 2007–NM–367–AD] RIN 2120–AA64 Airworthiness Directives; Bombardier Model DHC–8–102, DHC–8–103, DHC– 8–106, DHC–8–201, DHC–8–202, DHC– 8–301, DHC–8–311, and DHC–8–315 Airplanes Federal Aviation Administration (FAA), 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: Bombardier Aerospace has completed a system safety review of the aircraft fuel system against fuel tank safety standards * * *. [A]ssessment showed that supplemental maintenance tasks [inspections of fuel tank bonding jumpers, wiring harnesses, and drain valve components, among other items and actions; and applicable corrective actions] are required to prevent potential ignition sources inside the fuel system, which could result in a fuel tank explosion. * * * 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 March 20, 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. E:\FR\FM\19FEP1.SGM 19FEP1 9056 Federal Register / Vol. 73, No. 33 / Tuesday, February 19, 2008 / Proposed Rules • 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 W12–40, 1200 New Jersey Avenue, SE., Washington, DC, 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 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: Rocco Viselli, Aerospace Engineer, Airframe and Propulsion Branch, ANE– 171, FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228–7331; 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–2008–0179; Directorate Identifier 2007–NM–367–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–2007–32, dated December 17, 2007 (referred to after this as ‘‘the MCAI’’), to correct an unsafe condition for the specified products. The MCAI states: Bombardier Aerospace has completed a system safety review of the aircraft fuel system against fuel tank standards introduced in Chapter 525 of the Airworthiness Manual through Notice of Proposed Amendment (NPA) 2002–043. The identified non-compliances were then assessed using Transport Canada Policy Letter No. 525–001, to determine if mandatory corrective action is required. The assessment showed that supplemental maintenance tasks [inspections of fuel tank bonding jumpers, wiring harnesses, and drain valve components, among other items and actions; and applicable corrective actions] are required to prevent potential ignition sources inside the fuel system, which could result in a fuel tank explosion. Revisions have been made to Part 2 ‘‘Airworthiness Limitations List’’ of the DHC–8 Maintenance Program Manuals to introduce the required maintenance tasks. The corrective action is revising the Airworthiness Limitations Section of the Instructions for Continued Airworthiness to incorporate new limitations for fuel tank systems. You may obtain further information by examining the MCAI in the AD docket. The FAA has examined the underlying safety issues involved in fuel tank explosions on several large transport airplanes, including the adequacy of existing regulations, the service history of airplanes subject to those regulations, and existing maintenance practices for fuel tank systems. As a result of those findings, we issued a regulation titled ‘‘Transport Airplane Fuel Tank System Design Review, Flammability Reduction and Maintenance and Inspection Requirements’’ (66 FR 23086, May 7, 2001). In addition to new airworthiness standards for transport airplanes and new maintenance requirements, this rule included Special Federal Aviation Regulation No. 88 (‘‘SFAR 88,’’ Amendment 21–78, and subsequent Amendments 21–82 and 21–83). Among other actions, SFAR 88 requires certain type design (i.e., type certificate (TC) and supplemental type certificate (STC)) holders to substantiate that their fuel tank systems can prevent ignition sources in the fuel tanks. This requirement applies to type design holders for large turbine-powered transport airplanes and for subsequent modifications to those airplanes. It requires them to perform design reviews and to develop design changes and maintenance procedures if their designs do not meet the new fuel tank safety standards. As explained in the preamble to the rule, we intended to adopt airworthiness directives to mandate any changes found necessary to address unsafe conditions identified as a result of these reviews. In evaluating these design reviews, we have established four criteria intended to define the unsafe conditions associated with fuel tank systems that require corrective actions. The percentage of operating time during which fuel tanks are exposed to flammable conditions is one of these criteria. The other three criteria address the failure types under evaluation: Single failures, single failures in combination with a latent condition(s), and in-service failure experience. For all four criteria, the evaluations included consideration of previous actions taken that may mitigate the need for further action. We have determined that the actions identified in this AD are necessary to reduce the potential of ignition sources inside fuel tanks, which, in combination with flammable fuel vapors, could result in fuel tank explosions and consequent loss of the airplane. Relevant Service Information Bombardier (de Havilland) has issued temporary revisions (TRs) to Part 2 ‘‘Airworthiness Limitations List’’ (AWL) of the de Havilland Dash 8 Series Maintenance Program Manuals (MPMs). The TRs are listed in the table titled ‘‘TRs to the DHC–8 MPMs.’’ TRS TO THE DHC–8 MPMS rwilkins on PROD1PC63 with PROPOSALS MPM TR Nos. Dash 8 Series 100 Product Support Manual 1–8–7 .................................................................................. Dash 8 Series 200 Product Support Manual 1–82–7 ................................................................................ Dash 8 Series 300 Product Support Manual 1–83–7 ................................................................................ AWL–110 ... AWL 2–43 AWL 3–109 VerDate Aug<31>2005 16:24 Feb 15, 2008 Jkt 214001 PO 00000 Frm 00004 Fmt 4702 Sfmt 4702 E:\FR\FM\19FEP1.SGM 19FEP1 TR date August 31, 2007. August 31, 2007. August 31, 2007. Federal Register / Vol. 73, No. 33 / Tuesday, February 19, 2008 / Proposed Rules 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. This proposed AD would also allow accomplishing the AWL revision in accordance with later revisions of the Maintenance Program Manual (MPM) as an acceptable method of compliance if the limit or interval is part of a later approved MPM revision or the limit or interval is approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (g) of this proposed AD. In most ADs, we adopt a compliance time allowing a specified amount of time after the AD’s effective date. In this case, however, the FAA has already issued regulations that require operators to revise their maintenance/inspection programs to address fuel tank safety issues. The compliance date for these regulations is December 16, 2008. To provide for coordinated implementation of these regulations and this proposed AD, we are using this same compliance date in this proposed AD. rwilkins on PROD1PC63 with PROPOSALS 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. VerDate Aug<31>2005 16:24 Feb 15, 2008 Jkt 214001 9057 Costs of Compliance Based on the service information, we estimate that this proposed AD would affect about 122 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 $9,760, or $80 per product. The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows: 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. § 39.13 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. PO 00000 Frm 00005 Fmt 4702 Sfmt 4702 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. [Amended] 2. The FAA amends § 39.13 by adding the following new AD: Bombardier, Inc. (Formerly de Havilland, Inc.): Docket No. FAA–2008–0179; Directorate Identifier 2007–NM–367–AD. Comments Due Date (a) We must receive comments by March 20, 2008. Affected ADs (b) None. Applicability (c) This AD applies to all Bombardier Model DHC–8–102, DHC–8–103, DHC–8– 106, DHC–8–201, DHC–8–202, DHC–8–301, DHC–8–311, and DHC–8–315 airplanes, certificated in any category, all serial numbers. Note 1: This AD requires revisions to certain operator maintenance documents to include new inspections. Compliance with these inspections is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by these inspections, the operator may not be able to accomplish the inspections described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance according to paragraph (g) of this AD. The request should include a description of changes to the required inspections that will ensure the continued operational safety of the airplane. Subject (d) Air Transport Association (ATA) of America Code 28: Fuel. Reason (e) The mandatory continuing airworthiness information (MCAI) states: Bombardier Aerospace has completed a system safety review of the aircraft fuel system against fuel tank standards introduced in Chapter 525 of the Airworthiness Manual through Notice of Proposed Amendment (NPA) 2002–043. The identified non-compliances were then assessed using Transport Canada Policy Letter No. 525–001, to determine if mandatory corrective action is required. The assessment showed that supplemental maintenance tasks [inspections of fuel tank bonding jumpers, wiring harnesses, and drain valve components, among other items and actions; and applicable corrective actions] are required to prevent potential E:\FR\FM\19FEP1.SGM 19FEP1 9058 Federal Register / Vol. 73, No. 33 / Tuesday, February 19, 2008 / Proposed Rules ignition sources inside the fuel system, which could result in a fuel tank explosion. Revisions have been made to Part 2 ‘‘Airworthiness Limitations List’’ of the DHC–8 Maintenance Program Manuals to introduce the required maintenance tasks. The corrective action is revising the Airworthiness Limitations Section of the Instructions for Continued Airworthiness to incorporate new limitations for fuel tank systems. Actions and Compliance (f) Unless already done, do the following actions. (1) Within 60 days after the effective date of this AD, or before December 16, 2008, whichever occurs first, revise the Airworthiness Limitations Section (ALS) of the Instructions for Continued Airworthiness to incorporate the fuel system limitations tasks identified in the de Havilland temporary revisions (TRs) to Part 2 ‘‘Airworthiness Limitations List’’ of the Dash 8 Series Maintenance Program Manuals (‘‘the MPMs’’). The TRs are listed in Table 1 of this AD. For the tasks identified in the TRs, the initial compliance times start from the later of the times specified in paragraphs (f)(1)(i) and (f)(1)(ii) of this AD, and the repetitive inspections must be accomplished thereafter at the interval specified in the TRs to the MPM, except as provided by paragraphs (f)(2), (f)(3), (f)(4), and (g)(1) of this AD. (i) The effective date of this AD. (ii) The date of issuance of the original Canadian standard airworthiness certificate or the date of issuance of the original Canadian export certificate of airworthiness. TABLE 1.—TEMPORARY REVISIONS de Havilland TR Maintenance Program Manual (MPM) DHC–8–102, DHC–8–103, and DHC–8–106 airplanes. AWL–110, dated August 31, 2007 ................... DHC–8–201, and DHC–8–202 airplanes .......... AWL 2–43, dated August 31, 2007 .................. DHC–8–301, DHC–8–311, and DHC–8–315 airplanes. rwilkins on PROD1PC63 with PROPOSALS Model AWL 3–109, dated August 31, 2007 ................ Dash 8 Series 100 MPM, Product Support Manual (PSM) 1–8–7, Part 2, ‘‘Airworthiness Limitations List’’. Dash 8 Series 200 MPM, PSM 1–82–7, Part 2, ‘‘Airworthiness Limitations List’’. Dash 8 Series 300 MPM, PSM 1–83–7, Part 2, ‘‘Airworthiness Limitations List’’. Note 2: The actions required by paragraph (f)(1) of this AD may be done by inserting a copies of the applicable TR listed in Table 1 of this AD into the Airworthiness Limitations section of the applicable MPM listed in Table 1 of this AD. When the applicable TR has been included in general revisions of the applicable MPM, the general revisions may be inserted in the MPM, provided the relevant information in the general revision is identical to that in the applicable TR. (2) For airplanes that have accumulated 4,000 total flight hours, or 24 months since new as of the effective date of this AD: For those tasks with 6,000 flight hours/36 month inspection intervals, do the initial inspection within 2,000 flight hours or 12 months after the effective date of this AD, whichever occurs first. Thereafter, repeat the inspection at intervals not to exceed 6,000 flight hours or 36 months, whichever occurs first. (3) For airplanes that have accumulated 12,000 total flight hours, or 72 months since new as of the effective date of this AD: For those tasks with 18,000 flight hours/108 month inspection intervals, do the initial inspection within 6,000 flight hours or 36 months after the effective date of this AD, whichever occurs first. Thereafter, repeat the inspection at intervals not to exceed 18,000 flight hours or 108 months, whichever occurs first. (4) After accomplishing the actions specified in paragraphs (f)(1), (f)(2), and (f)(3) of this AD, no alternative inspections or inspection intervals may be used unless the inspections or inspection intervals are part of a later revision of Part 2 ‘‘Airworthiness Limitations List’’ of the applicable de Havilland Dash 8 Series MPM listed in Table 2 of this AD, that is approved by the Manager, New York Aircraft Certification Office (ACO), FAA, or the Transport Canada Civil Aviation (TCCA) (or its delegated agent); or unless inspections or inspection intervals are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (g)(1) of this AD. VerDate Aug<31>2005 16:36 Feb 15, 2008 Jkt 214001 TABLE 2.—MPMS Maintenance Program Manual (MPM) Model ........................ DHC–8–102, DHC–8–103, and DHC–8– 106 airplanes. DHC–8–201, and DHC–8– 202 airplanes. DHC–8–301, DHC–8–311, and DHC–8– 315 airplanes. Dash 8 Series 100 MPM, Product Support Manual (PSM) 1–8–7, Part 2, ‘‘Airworthiness Limitations List,’’ Revision 17, dated April 19, 2005. Dash 8 Series 200 MPM, PSM 1–82–7, Part 2, ‘‘Airworthiness Limitations List,’’ Revision 5, dated August 15, 2001. Dash 8 Series 300 MPM, PSM 1–83–7, Part 2, ‘‘Airworthiness Limitations List,’’ Revision 16, dated August 15, 2001. FAA AD Differences Note 3: 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 ACO, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures PO 00000 Frm 00006 Fmt 4702 Sfmt 4702 found in 14 CFR 39.19. Send information to ATTN: Rocco Viselli, Aerospace Engineer, Airframe and Propulsion Branch, ANE–171, FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228–7331; fax (516) 794–5531. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAAapproved 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–2007–32, dated December 17, 2007, and the temporary revisions listed in Table 1 of this AD. Issued in Renton, Washington, on February 11, 2008. Stephen P. Boyd, Assistant Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E8–3000 Filed 2–15–08; 8:45 am] BILLING CODE 4910–13–P E:\FR\FM\19FEP1.SGM 19FEP1

Agencies

[Federal Register Volume 73, Number 33 (Tuesday, February 19, 2008)]
[Proposed Rules]
[Pages 9055-9058]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E8-3000]


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

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0179; Directorate Identifier 2007-NM-367-AD]
RIN 2120-AA64


Airworthiness Directives; Bombardier Model DHC-8-102, DHC-8-103, 
DHC-8-106, DHC-8-201, DHC-8-202, DHC-8-301, DHC-8-311, and DHC-8-315 
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:

    Bombardier Aerospace has completed a system safety review of the 
aircraft fuel system against fuel tank safety standards * * *.
    [A]ssessment showed that supplemental maintenance tasks 
[inspections of fuel tank bonding jumpers, wiring harnesses, and 
drain valve components, among other items and actions; and 
applicable corrective actions] are required to prevent potential 
ignition sources inside the fuel system, which could result in a 
fuel tank explosion. * * *

    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 March 20, 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.

[[Page 9056]]

     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 W12-40, 1200 New 
Jersey Avenue, SE., Washington, DC, 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 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: Rocco Viselli, Aerospace Engineer, 
Airframe and Propulsion Branch, ANE-171, FAA, New York Aircraft 
Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New 
York 11590; telephone (516) 228-7331; 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-2008-0179; 
Directorate Identifier 2007-NM-367-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-
2007-32, dated December 17, 2007 (referred to after this as ``the 
MCAI''), to correct an unsafe condition for the specified products. The 
MCAI states:

    Bombardier Aerospace has completed a system safety review of the 
aircraft fuel system against fuel tank standards introduced in 
Chapter 525 of the Airworthiness Manual through Notice of Proposed 
Amendment (NPA) 2002-043. The identified non-compliances were then 
assessed using Transport Canada Policy Letter No. 525-001, to 
determine if mandatory corrective action is required.
    The assessment showed that supplemental maintenance tasks 
[inspections of fuel tank bonding jumpers, wiring harnesses, and 
drain valve components, among other items and actions; and 
applicable corrective actions] are required to prevent potential 
ignition sources inside the fuel system, which could result in a 
fuel tank explosion. Revisions have been made to Part 2 
``Airworthiness Limitations List'' of the DHC-8 Maintenance Program 
Manuals to introduce the required maintenance tasks.

The corrective action is revising the Airworthiness Limitations Section 
of the Instructions for Continued Airworthiness to incorporate new 
limitations for fuel tank systems. You may obtain further information 
by examining the MCAI in the AD docket.
    The FAA has examined the underlying safety issues involved in fuel 
tank explosions on several large transport airplanes, including the 
adequacy of existing regulations, the service history of airplanes 
subject to those regulations, and existing maintenance practices for 
fuel tank systems. As a result of those findings, we issued a 
regulation titled ``Transport Airplane Fuel Tank System Design Review, 
Flammability Reduction and Maintenance and Inspection Requirements'' 
(66 FR 23086, May 7, 2001). In addition to new airworthiness standards 
for transport airplanes and new maintenance requirements, this rule 
included Special Federal Aviation Regulation No. 88 (``SFAR 88,'' 
Amendment 21-78, and subsequent Amendments 21-82 and 21-83).
    Among other actions, SFAR 88 requires certain type design (i.e., 
type certificate (TC) and supplemental type certificate (STC)) holders 
to substantiate that their fuel tank systems can prevent ignition 
sources in the fuel tanks. This requirement applies to type design 
holders for large turbine-powered transport airplanes and for 
subsequent modifications to those airplanes. It requires them to 
perform design reviews and to develop design changes and maintenance 
procedures if their designs do not meet the new fuel tank safety 
standards. As explained in the preamble to the rule, we intended to 
adopt airworthiness directives to mandate any changes found necessary 
to address unsafe conditions identified as a result of these reviews.
    In evaluating these design reviews, we have established four 
criteria intended to define the unsafe conditions associated with fuel 
tank systems that require corrective actions. The percentage of 
operating time during which fuel tanks are exposed to flammable 
conditions is one of these criteria. The other three criteria address 
the failure types under evaluation: Single failures, single failures in 
combination with a latent condition(s), and in-service failure 
experience. For all four criteria, the evaluations included 
consideration of previous actions taken that may mitigate the need for 
further action.
    We have determined that the actions identified in this AD are 
necessary to reduce the potential of ignition sources inside fuel 
tanks, which, in combination with flammable fuel vapors, could result 
in fuel tank explosions and consequent loss of the airplane.

Relevant Service Information

    Bombardier (de Havilland) has issued temporary revisions (TRs) to 
Part 2 ``Airworthiness Limitations List'' (AWL) of the de Havilland 
Dash 8 Series Maintenance Program Manuals (MPMs). The TRs are listed in 
the table titled ``TRs to the DHC-8 MPMs.''

                          TRs to the DHC-8 MPMs
------------------------------------------------------------------------
               MPM                      TR Nos.             TR date
------------------------------------------------------------------------
Dash 8 Series 100 Product         AWL-110...........  August 31, 2007.
 Support Manual 1-8-7.
Dash 8 Series 200 Product         AWL 2-43..........  August 31, 2007.
 Support Manual 1-82-7.
Dash 8 Series 300 Product         AWL 3-109           August 31, 2007.
 Support Manual 1-83-7.
------------------------------------------------------------------------


[[Page 9057]]

    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.
    This proposed AD would also allow accomplishing the AWL revision in 
accordance with later revisions of the Maintenance Program Manual (MPM) 
as an acceptable method of compliance if the limit or interval is part 
of a later approved MPM revision or the limit or interval is approved 
as an alternative method of compliance (AMOC) in accordance with the 
procedures specified in paragraph (g) of this proposed AD.
    In most ADs, we adopt a compliance time allowing a specified amount 
of time after the AD's effective date. In this case, however, the FAA 
has already issued regulations that require operators to revise their 
maintenance/inspection programs to address fuel tank safety issues. The 
compliance date for these regulations is December 16, 2008. To provide 
for coordinated implementation of these regulations and this proposed 
AD, we are using this same compliance date in this proposed AD.

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 122 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 $9,760, or $80 per product.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. ``Subtitle VII: Aviation 
Programs,'' describes in more detail the scope of the Agency's 
authority.
    We are issuing this rulemaking under the authority described in 
``Subtitle VII, Part A, Subpart III, Section 44701: General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Findings

    We determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would not 
have a substantial direct effect on the States, on the relationship 
between the national Government and the States, or on the distribution 
of power and responsibilities among the various levels of government.
    For the reasons discussed above, I certify this proposed 
regulation:
    1. Is not a ``significant regulatory action'' under Executive Order 
12866;
    2. Is not a ``significant rule'' under the DOT Regulatory Policies 
and Procedures (44 FR 11034, February 26, 1979); and
    3. Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this proposed AD and placed it in the AD docket.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

    1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.


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-2008-
0179; Directorate Identifier 2007-NM-367-AD.

Comments Due Date

    (a) We must receive comments by March 20, 2008.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to all Bombardier Model DHC-8-102, DHC-8-
103, DHC-8-106, DHC-8-201, DHC-8-202, DHC-8-301, DHC-8-311, and DHC-
8-315 airplanes, certificated in any category, all serial numbers.

    Note 1: This AD requires revisions to certain operator 
maintenance documents to include new inspections. Compliance with 
these inspections is required by 14 CFR 91.403(c). For airplanes 
that have been previously modified, altered, or repaired in the 
areas addressed by these inspections, the operator may not be able 
to accomplish the inspections described in the revisions. In this 
situation, to comply with 14 CFR 91.403(c), the operator must 
request approval for an alternative method of compliance according 
to paragraph (g) of this AD. The request should include a 
description of changes to the required inspections that will ensure 
the continued operational safety of the airplane.

Subject

    (d) Air Transport Association (ATA) of America Code 28: Fuel.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:
    Bombardier Aerospace has completed a system safety review of the 
aircraft fuel system against fuel tank standards introduced in 
Chapter 525 of the Airworthiness Manual through Notice of Proposed 
Amendment (NPA) 2002-043. The identified non-compliances were then 
assessed using Transport Canada Policy Letter No. 525-001, to 
determine if mandatory corrective action is required.
    The assessment showed that supplemental maintenance tasks 
[inspections of fuel tank bonding jumpers, wiring harnesses, and 
drain valve components, among other items and actions; and 
applicable corrective actions] are required to prevent potential

[[Page 9058]]

ignition sources inside the fuel system, which could result in a 
fuel tank explosion. Revisions have been made to Part 2 
``Airworthiness Limitations List'' of the DHC-8 Maintenance Program 
Manuals to introduce the required maintenance tasks.

The corrective action is revising the Airworthiness Limitations 
Section of the Instructions for Continued Airworthiness to 
incorporate new limitations for fuel tank systems.

Actions and Compliance

    (f) Unless already done, do the following actions.
    (1) Within 60 days after the effective date of this AD, or 
before December 16, 2008, whichever occurs first, revise the 
Airworthiness Limitations Section (ALS) of the Instructions for 
Continued Airworthiness to incorporate the fuel system limitations 
tasks identified in the de Havilland temporary revisions (TRs) to 
Part 2 ``Airworthiness Limitations List'' of the Dash 8 Series 
Maintenance Program Manuals (``the MPMs''). The TRs are listed in 
Table 1 of this AD. For the tasks identified in the TRs, the initial 
compliance times start from the later of the times specified in 
paragraphs (f)(1)(i) and (f)(1)(ii) of this AD, and the repetitive 
inspections must be accomplished thereafter at the interval 
specified in the TRs to the MPM, except as provided by paragraphs 
(f)(2), (f)(3), (f)(4), and (g)(1) of this AD.
    (i) The effective date of this AD.
    (ii) The date of issuance of the original Canadian standard 
airworthiness certificate or the date of issuance of the original 
Canadian export certificate of airworthiness.

                      Table 1.--Temporary Revisions
------------------------------------------------------------------------
                                                          Maintenance
              Model                 de Havilland TR     Program Manual
                                                             (MPM)
------------------------------------------------------------------------
DHC-8-102, DHC-8-103, and DHC-8-  AWL-110, dated      Dash 8 Series 100
 106 airplanes.                    August 31, 2007.    MPM, Product
                                                       Support Manual
                                                       (PSM) 1-8-7, Part
                                                       2,
                                                       ``Airworthiness
                                                       Limitations
                                                       List''.
DHC-8-201, and DHC-8-202          AWL 2-43, dated     Dash 8 Series 200
 airplanes.                        August 31, 2007.    MPM, PSM 1-82-7,
                                                       Part 2,
                                                       ``Airworthiness
                                                       Limitations
                                                       List''.
DHC-8-301, DHC-8-311, and DHC-8-  AWL 3-109, dated    Dash 8 Series 300
 315 airplanes.                    August 31, 2007.    MPM, PSM 1-83-7,
                                                       Part 2,
                                                       ``Airworthiness
                                                       Limitations
                                                       List''.
------------------------------------------------------------------------


    Note 2: The actions required by paragraph (f)(1) of this AD may 
be done by inserting a copies of the applicable TR listed in Table 1 
of this AD into the Airworthiness Limitations section of the 
applicable MPM listed in Table 1 of this AD. When the applicable TR 
has been included in general revisions of the applicable MPM, the 
general revisions may be inserted in the MPM, provided the relevant 
information in the general revision is identical to that in the 
applicable TR.

    (2) For airplanes that have accumulated 4,000 total flight 
hours, or 24 months since new as of the effective date of this AD: 
For those tasks with 6,000 flight hours/36 month inspection 
intervals, do the initial inspection within 2,000 flight hours or 12 
months after the effective date of this AD, whichever occurs first. 
Thereafter, repeat the inspection at intervals not to exceed 6,000 
flight hours or 36 months, whichever occurs first.
    (3) For airplanes that have accumulated 12,000 total flight 
hours, or 72 months since new as of the effective date of this AD: 
For those tasks with 18,000 flight hours/108 month inspection 
intervals, do the initial inspection within 6,000 flight hours or 36 
months after the effective date of this AD, whichever occurs first. 
Thereafter, repeat the inspection at intervals not to exceed 18,000 
flight hours or 108 months, whichever occurs first.
    (4) After accomplishing the actions specified in paragraphs 
(f)(1), (f)(2), and (f)(3) of this AD, no alternative inspections or 
inspection intervals may be used unless the inspections or 
inspection intervals are part of a later revision of Part 2 
``Airworthiness Limitations List'' of the applicable de Havilland 
Dash 8 Series MPM listed in Table 2 of this AD, that is approved by 
the Manager, New York Aircraft Certification Office (ACO), FAA, or 
the Transport Canada Civil Aviation (TCCA) (or its delegated agent); 
or unless inspections or inspection intervals are approved as an 
alternative method of compliance (AMOC) in accordance with the 
procedures specified in paragraph (g)(1) of this AD.

                             Table 2.--MPMs
------------------------------------------------------------------------
                                            Maintenance Program Manual
                 Model                                (MPM)
------------------------------------------------------------------------
                                         ...............................
DHC-8-102, DHC-8-103, and DHC-8-106      Dash 8 Series 100 MPM, Product
 airplanes.                               Support Manual (PSM) 1-8-7,
                                          Part 2, ``Airworthiness
                                          Limitations List,'' Revision
                                          17, dated April 19, 2005.
DHC-8-201, and DHC-8-202 airplanes.....  Dash 8 Series 200 MPM, PSM 1-82-
                                          7, Part 2, ``Airworthiness
                                          Limitations List,'' Revision
                                          5, dated August 15, 2001.
DHC-8-301, DHC-8-311, and DHC-8-315      Dash 8 Series 300 MPM, PSM 1-83-
 airplanes.                               7, Part 2, ``Airworthiness
                                          Limitations List,'' Revision
                                          16, dated August 15, 2001.
------------------------------------------------------------------------

FAA AD Differences

    Note 3: 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 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: Rocco Viselli, Aerospace Engineer, Airframe and 
Propulsion Branch, ANE-171, FAA, New York Aircraft Certification 
Office, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; 
telephone (516) 228-7331; fax (516) 794-5531. Before using any 
approved AMOC on any airplane to which the AMOC applies, notify your 
appropriate principal inspector (PI) in the FAA Flight Standards 
District Office (FSDO), or lacking a PI, your local FSDO.
    (2) Airworthy Product: For any requirement in this AD to obtain 
corrective actions from a manufacturer or other source, use these 
actions if they are FAA-approved. Corrective actions are considered 
FAA-approved if they are approved by the State of Design Authority 
(or their delegated agent). You are required to assure the product 
is airworthy before it is returned to service.
    (3) Reporting Requirements: For any reporting requirement in 
this AD, under the provisions of the Paperwork Reduction Act, 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-2007-32, 
dated December 17, 2007, and the temporary revisions listed in Table 
1 of this AD.

    Issued in Renton, Washington, on February 11, 2008.
Stephen P. Boyd,
Assistant Manager, Transport Airplane Directorate, Aircraft 
Certification Service.
 [FR Doc. E8-3000 Filed 2-15-08; 8:45 am]
BILLING CODE 4910-13-P
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