
[Federal Register: June 9, 2008 (Volume 73, Number 111)]
[Proposed Rules]               
[Page 32486-32488]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr09jn08-8]                         

========================================================================
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.

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



[[Page 32486]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0623; Directorate Identifier 2008-NM-089-AD]
RIN 2120-AA64

 
Airworthiness Directives; Bombardier Model CL-600-2C10 (Regional 
Jet Series 700, 701, & 702), Model CL-600-2D15 (Regional Jet Series 
705), and CL-600-2D24 (Regional Jet Series 900) 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:

    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 [for the 
fuel tank wiring harness installation, and the hydraulic system No. 
3 temperature transducer, among other items] 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 July 9, 2008.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Portal: Go to http://
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.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://
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-2008-0623; 
Directorate Identifier 2008-NM-089-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 http://
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 February 28, 2008, we issued AD 2008-06-01, Amendment 39-15413 
(73 FR 13098, March 12, 2008). That AD required actions intended to 
address an unsafe condition on the products listed above.
    Since we issued AD 2008-06-01, we have determined that the initial 
compliance times for doing the tasks specified in paragraph (f)(1) of 
that AD must be reduced. AD 2008-06-01 resulted from Canadian 
Airworthiness Directive CF-2007-28, dated November 22, 2007 (referred 
to after this as ``the MCAI'').
    The MCAI does not provide an initial compliance time for doing the 
tasks. In AD 2008-06-01, we required an initial compliance time that 
started from the effective date of the AD, or the date of issuance of 
the original Canadian standard airworthiness certificate or the date of 
issuance of the original Canadian export certificate of airworthiness, 
whichever occurs later. Although the initial compliance time for doing 
the tasks is unstated in the MCAI, we have determined that the intent 
of the MCAI is for the initial compliance time to start from the 
initial delivery date of the airplane in order to address the 
identified unsafe condition in a timely manner.
    This proposed AD would require reduced thresholds for the initial 
compliance times. We have also revised the initial compliance times by 
providing a threshold and grace period for the tasks. You may obtain 
further information by examining the MCAI in the AD docket.

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.

[[Page 32487]]

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 289 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 $23,120, 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 removing Amendment 39-15413 (73 FR 
13098, March 12, 2008) and adding the following new AD:

Bombardier, Inc. (Formerly Canadair): Docket No. FAA-2008-0623; 
Directorate Identifier 2008-NM-089-AD.

Comments Due Date

    (a) We must receive comments by July 9, 2008.

Affected ADs

    (b) The proposed AD supersedes AD 2008-06-01, Amendment 39-
15413.

Applicability

    (c) This AD applies to all Bombardier Model CL-600-2C10 
(Regional Jet Series 700, 701, & 702), Model CL-600-2D15 (Regional 
Jet Series 705), and CL-600-2D24 (Regional Jet Series 900) 
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 (h)(1) 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 [for 
the fuel tank wiring harness installation, and the hydraulic system 
No. 3 temperature transducer, among other items] are required to 
prevent potential ignition sources inside the fuel system, which 
could result in a fuel tank explosion. Revision has been made to 
Canadair Regional Jet Models CL-600-2C10, CL-600-2D15 and CL-600-
2D24 Maintenance Requirements Manual, CSP B-053, Part 2, Section 3 
``Fuel System Limitations'' to introduce the required maintenance 
tasks.
    The corrective action is revising the Airworthiness Limitations 
Section (ALS) of the Instructions for Continued Airworthiness to 
incorporate new limitations for fuel tank systems.

Restatement of Certain Requirements of AD 2008-06-01

    (f) Unless already done, within 60 days after April 16, 2008 
(the effective date of AD 2008-06-01), revise the ALS of the 
Instructions for Continued Airworthiness to incorporate the 
inspection requirements in Section 3, ``Fuel System Limitations,'' 
of Part 2 of Bombardier CL-600-2C10, CL-600-2D15, and CL-600-2D24 
Maintenance Requirements Manual CSP B-053, Revision 9, dated July 
20, 2007 (``the MRM''). Accomplishing the revision in accordance 
with a later revision of the MRM is an acceptable method of 
compliance if the revision is approved by the Manager, New York 
Aircraft Certification Office (ACO), FAA, or Transport Canada Civil 
Aviation (TCCA) (or its delegated agent).

New Requirements of This AD: Actions and Compliance

    (g) Unless already done, do the following actions.
    (1) For task numbers 24-90-00-601, 24-90-00-602, 28-00-00-601, 
28-11-23-601, 28-11-23-602, 28-12-13-601, 29-30-00-601, and 29-30-
00-602 identified in the MRM, the initial compliance times start at 
the later of the applicable ``Threshold'' and ``Grace Period'' times 
specified in Table 1 of this AD, and the repetitive limitation tasks 
must be accomplished thereafter at the applicable interval specified 
in the MRM, except as provided by paragraphs (g)(2) and (h)(1) of 
this AD.

[[Page 32488]]



                      Table 1.--Initial Inspections
------------------------------------------------------------------------
                                    Compliance time  (whichever occurs
                                                  later)
           Description           ---------------------------------------
                                       Threshold         Grace period
------------------------------------------------------------------------
Tasks with limiting intervals of  Before the          Within 2,000
 8,000 flight hours.               accumulation of     flight hours
                                   8,000 total         after the
                                   flight hours.       effective date of
                                                       this AD.
Tasks with limiting intervals of  Before the          Within 6,000
 20,000 flight hours.              accumulation of     flight hours
                                   20,000 total        after the
                                   flight hours.       effective date of
                                                       this AD.
Tasks with limiting intervals of  Before the          Within 6,000
 30,000 flight hours.              accumulation of     flight hours
                                   30,000 total        after the
                                   flight hours.       effective date of
                                                       this AD.
------------------------------------------------------------------------

    (2) After accomplishing the actions specified in paragraph 
(g)(1) of this AD, no alternative inspections/limitation tasks or 
inspection/limitation task intervals may be used unless the 
inspections/limitation tasks or inspection/limitation task intervals 
are part of a later revision of the MRM, that is approved by the 
Manager, New York ACO, FAA; or TCCA (or its delegated agent); or 
unless the inspection/limitation task or inspection/limitation task 
interval is approved as an alternative method of compliance (AMOC) 
in accordance with the procedures specified in paragraph (h)(1) of 
this AD.

FAA AD Differences

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

Other FAA AD Provisions

    (h) The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, New 
York Aircraft Certification Office (ACO), FAA, has the authority to 
approve AMOCs for this AD, if requested using the procedures found 
in 14 CFR 39.19. Send information to ATTN: 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

    (i) Refer to Canadian Airworthiness Directive CF-2007-28, dated 
November 22, 2007; and Section 3, ``Fuel System Limitations,'' of 
Part 2 of Bombardier CL-600-2C10, CL-600-2D15, and CL-600-2D24 
Maintenance Requirements Manual CSP B-053, Revision 9, dated July 
20, 2007; for related information.

    Issued in Renton, Washington, on May 29, 2008.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. E8-12819 Filed 6-6-08; 8:45 am]

BILLING CODE 4910-13-P
