Airworthiness Directives; Bombardier, Inc. Model DHC-8-400, -401, and -402 Airplanes, 20787-20790 [2010-9110]

Download as PDF 20787 Proposed Rules Federal Register Vol. 75, No. 76 Wednesday, April 21, 2010 This section of the FEDERAL REGISTER contains notices to the public of the proposed issuance of rules and regulations. The purpose of these notices is to give interested persons an opportunity to participate in the rule making prior to the adoption of the final rules. DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2010–0382; Directorate Identifier 2009–NM–211–AD] RIN 2120–AA64 Airworthiness Directives; Bombardier, Inc. Model DHC–8–400, –401, and –402 Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). We propose to adopt a new airworthiness directive (AD) for the products listed above that would supersede an existing AD. 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: SUMMARY: Several cases have been reported where a loss of fluid in the No. 2 hydraulic system has caused the power transfer unit (PTU) to overspeed, resulting in pressure fluctuations and increased fluid flow within the No. 1 hydraulic system. In one case, the hydraulic system control logic did not shut down the PTU and the overspeed condition persisted, resulting in the illumination of the No. 1 HYD FLUID HOT caution light. erowe on DSK5CLS3C1PROD with PROPOSALS-1 * * * * * The unsafe condition is possible loss of both the No. 1 and No. 2 hydraulic systems, resulting in the potential loss of several functions essential for safe flight and landing of the airplane. 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 June 7, 2010. 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. VerDate Nov<24>2008 14:15 Apr 20, 2010 Jkt 220001 • 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. 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. 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: Fabio Buttitta, 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– 7303; 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–2010–0382; Directorate Identifier 2009–NM–211–AD’’ at the beginning of your comments. We specifically invite PO 00000 Frm 00001 Fmt 4702 Sfmt 4702 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 have lengthened the 30-day comment period for proposed ADs that address MCAI originated by aviation authorities of other countries to provide adequate time for interested parties to submit comments. The comment period for these proposed ADs is now typically 45 days, which is consistent with the comment period for domestic transport ADs. 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 On July 31, 2008, we issued AD 2008– 17–06, Amendment 39–15644 (73 FR 47818, August 15, 2008). That AD required actions intended to address an unsafe condition on the products listed above. Since we issued AD 2008–17–06, a modification of the power transfer unit (PTU) control logic, including the provision of automatic PTU shutdown in the event of loss of fluid in the No. 2 hydraulic system, has been developed. The modification addresses the identified unsafe condition. In addition, the applicability has been revised to remove airplanes having serial number 4185 and subsequent, since an equivalent modification has been installed in production on these airplanes. Transport Canada Civil Aviation (TCCA), which is the aviation authority for Canada, has issued Canadian Airworthiness Directive CF– 2006–08R1, dated August 31, 2009 (referred to after this as ‘‘the MCAI’’), to correct an unsafe condition for the specified products. The MCAI states: Several cases have been reported where a loss of fluid in the No. 2 hydraulic system has caused the power transfer unit (PTU) to overspeed, resulting in pressure fluctuations and increased fluid flow within the No. 1 hydraulic system. In one case, the hydraulic system control logic did not shut down the PTU and the overspeed condition persisted, resulting in the illumination of the No.1 HYD FLUID HOT caution light. E:\FR\FM\21APP1.SGM 21APP1 20788 Federal Register / Vol. 75, No. 76 / Wednesday, April 21, 2010 / Proposed Rules As an interim action to avoid possible loss of both the No. 1 and No. 2 hydraulic systems, the Airplane Flight Manual (AFM) has been revised to include pulling the HYD PWR XFER circuit breaker in the event of the loss of all hydraulic fluid in the No. 2 hydraulic system. Insertion of the resultant Temporary Amendment (TA) No. 13 into the AFM was mandated in the original issue of this [Canadian] directive. This instruction * * * remains in effect until * * * this [revised] directive is accomplished. Revision 1 of this directive * * * mandates modification of the PTU control logic, including the provision of automatic PTU shutdown in the event of loss of fluid in the No. 2 hydraulic system. In addition, the applicability of the [Canadian] directive has been revised to remove aircraft Serial Number (SN) 4185 and subsequent, since an equivalent modification has been installed in production on these aircraft. The unsafe condition is possible loss of both the No. 1 and No. 2 hydraulic systems, resulting in the potential loss of several functions essential for safe flight and landing of the airplane. You may obtain further information by examining the MCAI in the AD docket. Relevant Service Information Bombardier has issued Service Bulletin 84–29–22, Revision A, dated February 24, 2009. The actions described in this service information are intended to correct the unsafe condition identified in the MCAI. erowe on DSK5CLS3C1PROD with PROPOSALS-1 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 VerDate Nov<24>2008 14:15 Apr 20, 2010 Jkt 220001 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 42 products of U.S. registry. The actions that are required by AD 2008–17–06 and retained in this proposed AD take up about 1 work-hour per product, at an average labor rate of $85 per work hour. Required parts cost about $0 per product. Based on these figures, the estimated cost of the currently required actions is up to $85 per product. We estimate that it would take up to 165 work-hours per product to comply with the new basic requirements of this proposed AD. The average labor rate is $85 per work-hour. Required parts would cost about $10,982 per product. Where the service information lists required parts costs that are covered under warranty, we have assumed that there will be no charge for these costs. As we do not control warranty coverage for affected parties, some parties may incur costs higher than estimated here. Based on these figures, we estimate the cost of the proposed modification on U.S. operators to be up to $1,050,294, or up to $25,007 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 PO 00000 Frm 00002 Fmt 4702 Sfmt 4702 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. § 39.13 [Amended] 2. The FAA amends § 39.13 by removing Amendment 39–15644 (73 FR 47818, August 15, 2008) and adding the following new AD: Bombardier, Inc.: Docket No. FAA–2010– 0382; Directorate Identifier 2009–NM– 211–AD. Comments Due Date (a) We must receive comments by June 7, 2010. Affected ADs (b) This AD supersedes AD 2008–17–06, Amendment 39–15644. Applicability (c) This AD applies to Bombardier, Inc. Model DHC–8–400, –401, and –402 airplanes, certificated in any category; serial numbers 4001, 4003, 4004, 4006, and 4008 through 4184 inclusive. Subject (d) Air Transport Association (ATA) of America Code 29: Hydraulic power. Reason (e) The mandatory continuing airworthiness information (MCAI) states: ‘‘Several cases have been reported where a loss of fluid in the No.2 hydraulic system has caused the power transfer unit (PTU) to E:\FR\FM\21APP1.SGM 21APP1 Federal Register / Vol. 75, No. 76 / Wednesday, April 21, 2010 / Proposed Rules overspeed, resulting in pressure fluctuations and increased fluid flow within the No. 1 hydraulic system. In one case, the hydraulic system control logic did not shut down the PTU and the overspeed condition persisted, resulting in the illumination of the No.1 HYD FLUID HOT caution light. ‘‘As an interim action to avoid possible loss of both the No. 1 and No. 2 hydraulic systems, the Airplane Flight Manual (AFM) has been revised to include pulling the HYD PWR XFER circuit breaker in the event of the loss of all hydraulic fluid in the No. 2 hydraulic system. ‘‘Insertion of the resultant Temporary Amendment (TA) No. 13 into the AFM was mandated in the original issue of this [Canadian] directive. This instruction * * * remains in effect until * * * this [revised] directive is accomplished. ‘‘Revision 1 of this directive * * * mandates modification of the PTU control logic, including the provision of automatic PTU shutdown in the event of loss of fluid in the No. 2 hydraulic system. In addition, the applicability of the [Canadian] directive has been revised to remove aircraft Serial Number (SN) 4185 and subsequent, since an equivalent modification has been installed in production on these aircraft.’’ The unsafe condition is possible loss of both the No. 1 and No. 2 hydraulic systems, resulting in the potential loss of several functions essential for safe flight and landing of the airplane. Compliance (f) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. 20789 Restatement of Requirements of AD 2007– 12–03: Airplane Flight Manual (AFM) Revision (g) Within 14 days after July 10, 2007 (the effective date of AD 2007–12–03, Amendment 39–15081, which was superseded by AD 2008–17–06), revise the Limitations section of the applicable AFM to include the information in the applicable Bombardier temporary amendment specified in Table 1 of this AD, as specified in the temporary amendment. These temporary amendments introduce procedures for pulling the ‘‘HYD PWR XFER’’ circuit breaker in the event of the loss of all hydraulic fluid in the No. 1 or No. 2 hydraulic system. Operate the airplane according to the limitations and procedures in the applicable temporary amendment. TABLE 1—AFM TEMPORARY AMENDMENTS Use Bombardier Temporary Amendment— For Model— DHC–8–400 airplanes ................................................. DHC–8–401 airplanes ................................................. DHC–8–402 airplanes ................................................. Note 1: This may be done by inserting a copy of the applicable temporary amendment into the applicable AFM. When the applicable temporary amendment has been included in general revisions of the AFM, the general revisions may be inserted into the AFM, provided the relevant information in the general revisions is identical to that in the temporary amendment. Dated— Issue— 13 13 13 1 1 1 To Bombardier Dash 8 Q400 Airplane Flight Manual— July 14, 2005 .................................. July 14, 2005 .................................. July 14, 2005 .................................. PSM 1–84–1A. PSM 1–84–1A. PSM 1–84–1A. Restatement of Requirements of AD 2008– 17–06: AFM Revision (h) Within 14 days after September 2, 2008 (the effective date of AD 2008–17–06), revise the applicable AFM Normal and Abnormal Procedures section to include the information in the applicable Bombardier temporary amendment specified in Table 2 of this AD, as specified in the temporary amendment. These temporary amendments introduce additional procedures for ensuring that the ‘‘PTU CNTRL’’ switch is Normal, the ‘‘PTU CNTRL ON’’ advisory light is out, and the ‘‘HYD PWR XFER’’ circuit breaker is pulled in the event of the illumination of the ‘‘#2 HYD ISO VALVE’’ caution light. After accomplishing the AFM revision, the AFM limitation required by paragraph (g) in this AD may be removed from the AFM. TABLE 2—AFM TEMPORARY AMENDMENTS Use Bombardier Temporary Amendment— For Model— DHC–8–400 airplanes ................................................. DHC–8–401 airplanes ................................................. DHC–8–402 airplanes ................................................. Dated— Issue— 13 13 13 3 3 3 To Bombardier Dash 8 Q400 Airplane Flight Manual— June 9, 2008 .................................. June 9, 2008 .................................. June 9, 2008 .................................. PSM 1–84–1A. PSM 1–84–1A. PSM 1–84–1A. erowe on DSK5CLS3C1PROD with PROPOSALS-1 New Requirements of This AD: Actions FAA AD Differences (i) Within 6,000 flight hours after the effective date of this AD, modify the PTU control logic, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84–29–22, Revision A, dated February 24, 2009. Doing this modification terminates the requirements of paragraphs (g) and (h) of this AD, and after the modification has been done, the AFM limitation required by paragraphs (g) and (h) of this AD may be removed from the AFM. (j) Modifying the PTU control logic is also acceptable for compliance with the requirements of paragraph (i) of this AD if done before the effective date of this AD, in accordance with Bombardier Service Bulletin 84–29–22, dated December 5, 2008. Note 2: This AD differs from the MCAI and/or service information as follows: No differences. VerDate Nov<24>2008 14:15 Apr 20, 2010 Jkt 220001 Other FAA AD Provisions (k) The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, New York Aircraft Certification Office (ACO), ANE–170, 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: Program Manager, Continuing Operational Safety, FAA, New York ACO, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone 516–228–7300; fax 516– PO 00000 Frm 00003 Fmt 4702 Sfmt 4702 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. The AMOC approval letter must specifically reference this AD. (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. E:\FR\FM\21APP1.SGM 21APP1 20790 Federal Register / Vol. 75, No. 76 / Wednesday, April 21, 2010 / Proposed Rules (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 (l) Refer to MCAI Canadian Airworthiness Directive CF–2006–08R1, dated August 31, 2009; and Bombardier Service Bulletin 84– 29–22, Revision A, dated February 24, 2009; for related information. Issued in Renton, Washington, on April 9, 2010. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 2010–9110 Filed 4–20–10; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2010–0384; Directorate Identifier 2010–NM–003–AD] RIN 2120–AA64 Airworthiness Directives; McDonnell Douglas Corporation Model DC–10–10, DC–10–10F, DC–10–15, DC–10–30, DC– 10–30F (KC–10A and KDC–10), DC–10– 40, DC–10–40F, MD–10–10F, MD–10– 30F, MD–11, and MD–11F Airplanes erowe on DSK5CLS3C1PROD with PROPOSALS-1 AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Model DC–10–10, DC–10–10F, DC–10– 15, DC–10–30, DC–10–30F (KC–10A and KDC–10), DC–10–40, DC–10–40F, MD–10–10F, MD–10–30F, MD–11, and MD–11F airplanes. This proposed AD would require installing an in-line fuse in certain float level switches and sleeving the wires between the fuel tank and the in-line fuse. For certain airplanes this proposed AD would also require installing an in-line fuse in certain fuel pump pressure switches. This proposed AD results from fuel system reviews conducted by the manufacturer. We are proposing this AD to prevent fuel tank explosions and consequent loss of the airplane. DATES: We must receive comments on this proposed AD by June 7, 2010. ADDRESSES: You may send comments by any of the following methods: VerDate Nov<24>2008 14:15 Apr 20, 2010 Jkt 220001 • 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. For service information identified in this proposed AD, contact Boeing Commercial Airplanes, Attention: Data & Services Management, 3855 Lakewood Boulevard, MC D800–0019, Long Beach, California 90846–0001; telephone 206–544–5000, extension 2; fax 206–766–5683; e-mail dse.boecom@boeing.com; Internet https://www.myboeingfleet.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. 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: Philip Kush, Aerospace Engineer, Propulsion Branch, ANM–140L, FAA, Los Angeles Aircraft Certification Office, 3960 Paramount Boulevard, Lakewood, California 90712–4137; telephone (562) 627–5263; fax (562) 627–5210. 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–2010–0384; Directorate Identifier 2010–NM–003–AD’’ at the beginning of your comments. We specifically invite PO 00000 Frm 00004 Fmt 4702 Sfmt 4702 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 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 latent condition(s), E:\FR\FM\21APP1.SGM 21APP1

Agencies

[Federal Register Volume 75, Number 76 (Wednesday, April 21, 2010)]
[Proposed Rules]
[Pages 20787-20790]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2010-9110]

========================================================================
Proposed Rules
Federal Register
________________________________________________________________________

This section of the FEDERAL REGISTER contains notices to the public of
the proposed issuance of rules and regulations. The purpose of these
notices is to give interested persons an opportunity to participate in
the rule making prior to the adoption of the final rules.

========================================================================

Federal Register / Vol. 75, No. 76 / Wednesday, April 21, 2010 /
Proposed Rules

[[Page 20787]]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0382; Directorate Identifier 2009-NM-211-AD]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc. Model DHC-8-400, -401,
and -402 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 that would supersede an existing AD. 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:

Several cases have been reported where a loss of fluid in the
No. 2 hydraulic system has caused the power transfer unit (PTU) to
overspeed, resulting in pressure fluctuations and increased fluid
flow within the No. 1 hydraulic system. In one case, the hydraulic
system control logic did not shut down the PTU and the overspeed
condition persisted, resulting in the illumination of the No. 1 HYD
FLUID HOT caution light.
* * * * *
The unsafe condition is possible loss of both the No. 1 and No. 2
hydraulic systems, resulting in the potential loss of several functions
essential for safe flight and landing of the airplane. 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 June 7, 2010.

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 W12-40, 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.

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: Fabio Buttitta, 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) 228-7303; 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-2010-0382;
Directorate Identifier 2009-NM-211-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 have lengthened the 30-day comment period for proposed ADs that
address MCAI originated by aviation authorities of other countries to
provide adequate time for interested parties to submit comments. The
comment period for these proposed ADs is now typically 45 days, which
is consistent with the comment period for domestic transport ADs.
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

On July 31, 2008, we issued AD 2008-17-06, Amendment 39-15644 (73
FR 47818, August 15, 2008). That AD required actions intended to
address an unsafe condition on the products listed above.
Since we issued AD 2008-17-06, a modification of the power transfer
unit (PTU) control logic, including the provision of automatic PTU
shutdown in the event of loss of fluid in the No. 2 hydraulic system,
has been developed. The modification addresses the identified unsafe
condition. In addition, the applicability has been revised to remove
airplanes having serial number 4185 and subsequent, since an equivalent
modification has been installed in production on these airplanes.
Transport Canada Civil Aviation (TCCA), which is the aviation authority
for Canada, has issued Canadian Airworthiness Directive CF-2006-08R1,
dated August 31, 2009 (referred to after this as ``the MCAI''), to
correct an unsafe condition for the specified products. The MCAI
states:

[[Page 20788]]

As an interim action to avoid possible loss of both the No. 1
and No. 2 hydraulic systems, the Airplane Flight Manual (AFM) has
been revised to include pulling the HYD PWR XFER circuit breaker in
the event of the loss of all hydraulic fluid in the No. 2 hydraulic
system.
Insertion of the resultant Temporary Amendment (TA) No. 13 into
the AFM was mandated in the original issue of this [Canadian]
directive. This instruction * * * remains in effect until * * * this
[revised] directive is accomplished.
Revision 1 of this directive * * * mandates modification of the
PTU control logic, including the provision of automatic PTU shutdown
in the event of loss of fluid in the No. 2 hydraulic system. In
addition, the applicability of the [Canadian] directive has been
revised to remove aircraft Serial Number (SN) 4185 and subsequent,
since an equivalent modification has been installed in production on
these aircraft.

The unsafe condition is possible loss of both the No. 1 and No. 2
hydraulic systems, resulting in the potential loss of several functions
essential for safe flight and landing of the airplane. You may obtain
further information by examining the MCAI in the AD docket.

Relevant Service Information

Bombardier has issued Service Bulletin 84-29-22, Revision A, dated
February 24, 2009. 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 42 products of U.S. registry.
The actions that are required by AD 2008-17-06 and retained in this
proposed AD take up about 1 work-hour per product, at an average labor
rate of $85 per work hour. Required parts cost about $0 per product.
Based on these figures, the estimated cost of the currently required
actions is up to $85 per product.
We estimate that it would take up to 165 work-hours per product to
comply with the new basic requirements of this proposed AD. The average
labor rate is $85 per work-hour. Required parts would cost about
$10,982 per product. Where the service information lists required parts
costs that are covered under warranty, we have assumed that there will
be no charge for these costs. As we do not control warranty coverage
for affected parties, some parties may incur costs higher than
estimated here. Based on these figures, we estimate the cost of the
proposed modification on U.S. operators to be up to $1,050,294, or up
to $25,007 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 removing Amendment 39-15644 (73 FR
47818, August 15, 2008) and adding the following new AD:

Bombardier, Inc.: Docket No. FAA-2010-0382; Directorate Identifier
2009-NM-211-AD.

Comments Due Date

(a) We must receive comments by June 7, 2010.

Affected ADs

(b) This AD supersedes AD 2008-17-06, Amendment 39-15644.

Applicability

(c) This AD applies to Bombardier, Inc. Model DHC-8-400, -401,
and -402 airplanes, certificated in any category; serial numbers
4001, 4003, 4004, 4006, and 4008 through 4184 inclusive.

Subject

(d) Air Transport Association (ATA) of America Code 29:
Hydraulic power.

Reason

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

``Several cases have been reported where a loss of fluid in the
No.2 hydraulic system has caused the power transfer unit (PTU) to

[[Page 20789]]

overspeed, resulting in pressure fluctuations and increased fluid
flow within the No. 1 hydraulic system. In one case, the hydraulic
system control logic did not shut down the PTU and the overspeed
condition persisted, resulting in the illumination of the No.1 HYD
FLUID HOT caution light.
``As an interim action to avoid possible loss of both the No. 1
and No. 2 hydraulic systems, the Airplane Flight Manual (AFM) has
been revised to include pulling the HYD PWR XFER circuit breaker in
the event of the loss of all hydraulic fluid in the No. 2 hydraulic
system.
``Insertion of the resultant Temporary Amendment (TA) No. 13
into the AFM was mandated in the original issue of this [Canadian]
directive. This instruction * * * remains in effect until * * * this
[revised] directive is accomplished.
``Revision 1 of this directive * * * mandates modification of
the PTU control logic, including the provision of automatic PTU
shutdown in the event of loss of fluid in the No. 2 hydraulic
system. In addition, the applicability of the [Canadian] directive
has been revised to remove aircraft Serial Number (SN) 4185 and
subsequent, since an equivalent modification has been installed in
production on these aircraft.''

The unsafe condition is possible loss of both the No. 1 and No.
2 hydraulic systems, resulting in the potential loss of several
functions essential for safe flight and landing of the airplane.

Compliance

(f) You are responsible for having the actions required by this
AD performed within the compliance times specified, unless the
actions have already been done.

Restatement of Requirements of AD 2007-12-03: Airplane Flight Manual
(AFM) Revision

(g) Within 14 days after July 10, 2007 (the effective date of AD
2007-12-03, Amendment 39-15081, which was superseded by AD 2008-17-
06), revise the Limitations section of the applicable AFM to include
the information in the applicable Bombardier temporary amendment
specified in Table 1 of this AD, as specified in the temporary
amendment. These temporary amendments introduce procedures for
pulling the ``HYD PWR XFER'' circuit breaker in the event of the
loss of all hydraulic fluid in the No. 1 or No. 2 hydraulic system.
Operate the airplane according to the limitations and procedures in
the applicable temporary amendment.

Table 1--AFM Temporary Amendments
----------------------------------------------------------------------------------------------------------------
Use
Bombardier To Bombardier Dash 8
For Model-- Temporary Issue-- Dated-- Q400 Airplane Flight
Amendment-- Manual--
----------------------------------------------------------------------------------------------------------------
DHC-8-400 airplanes.............. 13 1 July 14, 2005...... PSM 1-84-1A.
DHC-8-401 airplanes.............. 13 1 July 14, 2005...... PSM 1-84-1A.
DHC-8-402 airplanes.............. 13 1 July 14, 2005...... PSM 1-84-1A.
----------------------------------------------------------------------------------------------------------------

Note 1: This may be done by inserting a copy of the applicable
temporary amendment into the applicable AFM. When the applicable
temporary amendment has been included in general revisions of the
AFM, the general revisions may be inserted into the AFM, provided
the relevant information in the general revisions is identical to
that in the temporary amendment.

Restatement of Requirements of AD 2008-17-06: AFM Revision

(h) Within 14 days after September 2, 2008 (the effective date
of AD 2008-17-06), revise the applicable AFM Normal and Abnormal
Procedures section to include the information in the applicable
Bombardier temporary amendment specified in Table 2 of this AD, as
specified in the temporary amendment. These temporary amendments
introduce additional procedures for ensuring that the ``PTU CNTRL''
switch is Normal, the ``PTU CNTRL ON'' advisory light is out, and
the ``HYD PWR XFER'' circuit breaker is pulled in the event of the
illumination of the ``2 HYD ISO VALVE'' caution light.
After accomplishing the AFM revision, the AFM limitation required by
paragraph (g) in this AD may be removed from the AFM.

Table 2--AFM Temporary Amendments
----------------------------------------------------------------------------------------------------------------
Use
Bombardier To Bombardier Dash 8
For Model-- Temporary Issue-- Dated-- Q400 Airplane Flight
Amendment-- Manual--
----------------------------------------------------------------------------------------------------------------
DHC-8-400 airplanes.............. 13 3 June 9, 2008....... PSM 1-84-1A.
DHC-8-401 airplanes.............. 13 3 June 9, 2008....... PSM 1-84-1A.
DHC-8-402 airplanes.............. 13 3 June 9, 2008....... PSM 1-84-1A.
----------------------------------------------------------------------------------------------------------------

New Requirements of This AD: Actions

(i) Within 6,000 flight hours after the effective date of this
AD, modify the PTU control logic, in accordance with the
Accomplishment Instructions of Bombardier Service Bulletin 84-29-22,
Revision A, dated February 24, 2009. Doing this modification
terminates the requirements of paragraphs (g) and (h) of this AD,
and after the modification has been done, the AFM limitation
required by paragraphs (g) and (h) of this AD may be removed from
the AFM.
(j) Modifying the PTU control logic is also acceptable for
compliance with the requirements of paragraph (i) of this AD if done
before the effective date of this AD, in accordance with Bombardier
Service Bulletin 84-29-22, dated December 5, 2008.

FAA AD Differences

Note 2: This AD differs from the MCAI and/or service
information as follows: No differences.

Other FAA AD Provisions

(k) The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager, New
York Aircraft Certification Office (ACO), ANE-170, 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: Program
Manager, Continuing Operational Safety, FAA, New York ACO, 1600
Stewart Avenue, Suite 410, Westbury, New York 11590; telephone 516-
228-7300; 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. The AMOC approval letter must
specifically reference this AD.
(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.

[[Page 20790]]

(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

(l) Refer to MCAI Canadian Airworthiness Directive CF-2006-08R1,
dated August 31, 2009; and Bombardier Service Bulletin 84-29-22,
Revision A, dated February 24, 2009; for related information.

Issued in Renton, Washington, on April 9, 2010.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 2010-9110 Filed 4-20-10; 8:45 am]
BILLING CODE 4910-13-P

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.