
[Federal Register: June 20, 2008 (Volume 73, Number 120)]
[Proposed Rules]               
[Page 35095-35098]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr20jn08-17]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0643; Directorate Identifier 2008-NM-094-AD]
RIN 2120-AA64

 
Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional 
Jet Series 100 and 440) Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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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 
certain bonding jumpers, wiring harnesses, and hydraulic systems, 
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 21, 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

[[Page 35096]]

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-2008-0643; 
Directorate Identifier 2008-NM-094-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 2008-06-02, Amendment 39-15414 
(73 FR 13100, March 12, 2008). That AD required actions intended to 
address an unsafe condition on the products listed above.
    Since we issued AD 2008-06-02, we have determined that, for certain 
airplanes, the initial compliance times for doing the tasks specified 
in paragraph (f)(1) of that AD must be reduced. AD 2008-06-02 resulted 
from Canadian Airworthiness Directive CF-2007-29, dated November 22, 
2007 (referred to after this as ``the MCAI'').
    The MCAI does not provide an initial compliance time for doing the 
tasks for certain airplanes. In AD 2008-06-02, for those airplanes, 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 for the airplanes and tasks that are not identified in 
paragraphs (f)(2), (f)(3), and (f)(4) of AD 2008-06-02. 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.

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 689 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 $55,120, 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 39-15414 (73 FR 
13100, March 12, 2008) and adding the following new AD:

Bombardier, Inc. (Formerly Canadair): Docket No. FAA-2008-0643; 
Directorate Identifier 2008-NM-094-AD.

Comments Due Date

    (a) We must receive comments by July 21, 2008.

Affected ADs

    (b) The proposed AD supersedes AD 2008-06-02, Amendment 39-
15414.

[[Page 35097]]

Applicability

    (c) This AD applies to all Bombardier Model CL-600-2B19 
(Regional Jet Series 100 & 440) 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 
certain bonding jumpers, wiring harnesses, and hydraulic systems, 
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 Model CL-
600-2B19 Maintenance Requirements Manual, CSP A-053, Part 2, 
Appendix D, ``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 2008-06-02

    (f) Unless already done, do the following actions.
    (1) Within 60 days after April 16, 2008 (the effective date of 
AD 2008-06-02), revise the Airworthiness Limitations Section (ALS) 
of the Instructions for Continued Airworthiness to incorporate the 
inspection and maintenance requirements, as applicable, in Canadair 
Regional Jet Model CL-600-2B19 Airworthiness Requirements in the 
Maintenance Requirements Manual, CSP A-053, Part 2, Appendix D, 
``Fuel System Limitations,'' Revision 7, dated May 10, 2007 (``the 
MRM''), task numbers 28-11-00-601, 28-11-00-602, 28-11-00-603, 28-
11-00-604, 29-33-01-601, and 29-33-01-602. Except as required by 
paragraph (g)(1) of this AD, for those task numbers, the initial 
compliance times start at the applicable time specified in 
paragraphs (f)(2), (f)(3), and (f)(4) of this AD, and the repetitive 
inspections must be accomplished thereafter at the interval 
specified in the MRM, except as provided by paragraphs (f)(5) and 
(h)(1) of this AD. 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).
    (2) For airplanes having more than 15,000 flight hours as of 
April 16, 2008, the initial compliance time for Tasks 28-11-00-601, 
28-11-00-602, 28-11-00-603, and 28-11-00-604 is within 5,000 flight 
hours after April 16, 2008. Thereafter, these tasks must be 
accomplished within the repetitive interval specified in Canadair 
Regional Jet Model CL-600-2B19, Airworthiness Requirements in the 
Maintenance Requirements Manual, CSP A-053, Part 2, Appendix D, 
``Fuel System Limitations,'' Revision 7, dated May 10, 2007.
    (3) For Task 29-33-01-601, the initial compliance time is within 
5,000 flight hours after April 16, 2008. Thereafter, task 29-33-01-
601 must be accomplished within the repetitive interval specified in 
Canadair Regional Jet Model CL-600-2B19, Airworthiness Requirements 
in the Maintenance Requirements Manual, CSP A-053, Part 2, Appendix 
D, ``Fuel System Limitations,'' Revision 7, dated May 10, 2007.
    (4) For airplanes having more than 27,500 flight hours as of 
April 16, 2008, the initial compliance time for Task 29-33-01-602 is 
within 2,500 flight hours after April 16, 2008. Thereafter, this 
task must be accomplished within the repetitive interval specified 
in Canadair Regional Jet Model CL-600-2B19, Airworthiness 
Requirements in the Maintenance Requirements Manual, CSP A-053, Part 
2, Appendix D, ``Fuel System Limitations,'' Revision 7, dated May 
10, 2007.
    (5) After accomplishing the actions specified in paragraphs 
(f)(1), (f)(2), (f)(3), and (f)(4) 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 approved revision of 
Canadair Regional Jet Model CL-600-2B19, Airworthiness Requirements 
in the Maintenance Requirements Manual, CSP A-053, Part 2, Appendix 
D, ``Fuel System Limitations,'' Revision 7, dated May 10, 2007, 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.

New Requirements of This AD: Actions and Compliance

    (g) Unless already done, do the following actions.
    (1) At the times specified in paragraphs (g)(1)(i) and 
(g)(1)(ii) of this AD, as applicable, do the initial inspection for 
Tasks 28-11-00-601, 28-11-00-602, 28-11-00-603, 28-11-00-604, and 
29-33-01-602, as applicable, in the MRM, and thereafter repeat the 
inspection at the applicable interval specified in the MRM, except 
as provided by (g)(2) of this AD.
    (i) For airplanes not identified in paragraph (f)(2) of this AD, 
the initial compliance time for Tasks 28-11-00-601, 28-11-00-602, 
28-11-00-603, and 28-11-00-604 is before the accumulation of 20,000 
total flight hours, or within 5,000 flight hours after the effective 
date of this AD, whichever occurs later.
    (ii) For airplanes not identified in paragraph (f)(4) of this 
AD, the initial compliance time for Task 29-33-01-602 is before the 
accumulation of 30,000 total flight hours, or within 2,500 flight 
hours after the effective date of this AD, whichever occurs later.
    (2) After accomplishing the actions specified in paragraphs 
(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 approved revision of Canadair Regional Jet Model 
CL-600-2B19, Airworthiness Requirements in the Maintenance 
Requirements Manual, CSP A-053, Part 2, Appendix D, ``Fuel System 
Limitations,'' Revision 7, dated May 10, 2007, 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

[[Page 35098]]

to assure the product is airworthy before it is returned to service.
    (3) Reporting Requirements: For any reporting requirement in 
this AD, under the provisions of the Paperwork Reduction Act, the 
Office of Management and Budget (OMB) has approved the information 
collection requirements and has assigned OMB Control Number 2120-
0056.

Related Information

    (i) Refer to MCAI Canadian Airworthiness Directive CF-2007-29, 
dated November 22, 2007, and Canadair Regional Jet Model CL-600-
2B19, Airworthiness Requirements in the Maintenance Requirements 
Manual, CSP A-053, Part 2, Appendix D, ``Fuel System Limitations,'' 
Revision 7, dated May 10, 2007; for related information.

    Issued in Renton, Washington, on June 10, 2008.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
 [FR Doc. E8-13922 Filed 6-19-08; 8:45 am]

BILLING CODE 4910-13-P
