Tdata AD

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PROPOSED AD	BOMBARDIER, INC. (FORMERLY CANADAIR): Docket No. FAA-2008-0521; Directorate Identifier 2008-NM-040-AD.

COMMENTS DUE DATE

(a) We must receive comments by June 6, 2008.

AFFECTED ADS

(b) None.

APPLICABILITY

(c) This AD applies to  Bombardier Model CL-600-2B19 (Regional Jet  Series
    100  & 440)  airplanes; certificated  in any  category; having  serial
    numbers (SNs) 7305 through 7990 and 8000 and subsequent.

SUBJECT

(d) Air Transport Association (ATA) of America Code 24: Electrical Power.

REASON

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

    Following in-flight  test deployments,  several Air-Driven  generators
    (ADGs)  failed  to come  on-line.  Investigation revealed  that,  as a
    result  of a  wiring anomaly  that had  not been  detected during  ADG
    manufacture, a  short circuit  was possible  between certain  internal
    wires and their metallic  over-braided shields, which could  result in
    the ADG  not providing  power when  deployed. This  directive mandates
    checking of the  ADG and modification  of the ADG  internal wiring, if
    required. It also prohibits future installation of unmodified ADGs.

    The unsafe condition is that failure of the ADG could lead to loss  of
    several functions essential for safe flight.

ACTIONS AND COMPLIANCE

(f) Unless already done, do the following actions.

(1) For  airplanes having  serial number  (SN) 7305  through 7990 and 8000
    through 8083: Within  12 months after  the effective date  of this AD,
    inspect the SN of the installed ADG. A review of airplane  maintenance
    records is acceptable in lieu of this inspection if the serial  number
    of the ADG can be conclusively determined from that review.

(i) If  the serial  number is  not listed  in paragraph  1.A of Bombardier
    Service Bulletin 601R-24-113,  Revision A, dated  August 11, 2005,  no
    further action is required by this AD.

(ii) If the serial number is listed in paragraph 1.A of Bombardier Service
     Bulletin  601R-24-113, Revision   A,  dated  August 11, 2005,  before
     further  flight,  inspect  the  ADG  identification  plate  and,   as
     applicable,   do   the   actions   of   paragraph   (f)(1)(ii)(A)  or
     (f)(1)(ii)(B) of this AD.

(A) If  the identification  plate is  marked  with  the symbol  "24-2", no
    further action is required by this AD.

(B) If  the identification  plate is  not marked  with the  symbol "24-2",
    modify  the   ADG  wiring   in  accordance   with  the  Accomplishment
    Instructions of the service bulletin.

(2) For airplanes having SN 7305 through 7990 and 8000 and subsequent:  As
    of the effective date  of this AD, no  ADG as described in  Table 1 of
    this AD may  be installed on  any airplane, unless  the identification
    plate  of  the  ADG is  identified with  the symbol  "24-2" (refer  to
    Hamilton  Sundstrand  Service   Bulletin  ERPS10AG-24-2  for   further
    information).

                          TABLE 1.--ADG IDENTIFICATION
    ----------------------------------------------------------------------
              ADG PART NO.--                   HAVING ADG SERIAL NO.--
    ----------------------------------------------------------------------
    604-90800-1 (761339C), 604-90800-   0101 through 0132, 0134 through
     17 (761339D), or 604-90800-19       0167, 0169 through 0358, 0360
     (761339E).                          through 0438, 0440 through 0456,
                                         0458 through 0467, 0469, 0471
                                         through 0590, 0592 through 0597,
                                         0599 through 0745, 0747 through
                                         1005, or 1400 through 1439.
    ----------------------------------------------------------------------

(3) Actions  done  before  the  effective date  of  this AD  according  to
    Bombardier Service  Bulletin 601R-24-113,  dated April  22, 2004,  are
    considered acceptable  for compliance  with the  corresponding actions
    specified in  this AD,  provided the  ADG has  not been replaced since
    those actions were done.

FAA AD DIFFERENCES

NOTE 1: This  AD  differs  from the  MCAI  and/or  service information  as
follows: No differences.

OTHER FAA AD PROVISIONS

(g) The following provisions also apply to this AD:

(1) Alternative  Methods  of  Compliance  (AMOCs): The  Manager,  New York
    Aircraft Certification Office, 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: Fabio Buttitta, Aerospace Engineer,  Systems
    and Flight Test Branch, ANE-172, FAA, New York Aircraft  Certification
    Office,  1600 Stewart  Avenue, Suite  410, Westbury,  New York  11590;
    telephone  (516)  228-7303;  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-2008-09,  dated
    February  5,  2008,  and  Bombardier  Service  Bulletin   601R-24-113,
    Revision A, dated August 11, 2005, for related information.

Issued in  Renton, Washington,  on April  25, 2008.  Ali Bahrami, Manager,
Transport Airplane Directorate, Aircraft Certification Service.

DATES: We must receive comments on this proposed AD by June 6, 2008.

PREAMBLE

DEPARTMENT OF TRANSPORTATION

FEDERAL AVIATION ADMINISTRATION

14 CFR Part 39

[Docket No. FAA-2008-0521; Directorate Identifier 2008-NM-040-AD]
RIN 2120-AA64

AIRWORTHINESS DIRECTIVES; Bombardier Model CL-600-2B19 (Regional
Jet Series 100 & 440) 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:

Following in-flight test deployments, several Air-Driven generators (ADGs)
failed to come on-line. Investigation revealed that, as a result of a
wiring anomaly that had not been detected during ADG manufacture, a short
circuit was possible between certain internal wires and their metallic
over-braided shields, which could result in the ADG not providing power
when deployed. * * *

The unsafe condition is that failure of the ADG could lead to loss of
several functions essential for safe flight. 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 6, 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: Fabio Buttitta, Aerospace Engineer,
Systems and Flight Test Branch, ANE-172, FAA, New York Aircraft
Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New York
11590; telephone (516) 228-7303; 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-2008-0521; Directorate
Identifier 2008-NM-040-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

Transport Canada Civil Aviation (TCCA), which is the aviation authority
for Canada, has issued Canadian Airworthiness Directive CF- 2008-09, dated
February 5, 2008 (referred to after this as "the MCAI"), to correct an
unsafe condition for the specified products. The MCAI states:

The unsafe condition is that failure of the ADG could lead to loss of
several functions essential for safe flight. You may obtain further
information by examining the MCAI in the AD docket.

RELEVANT SERVICE INFORMATION

Bombardier has issued Service Bulletin 601R-24-113, Revision A, dated
August 11, 2005. 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 686 products of U.S. registry. We also estimate that it would
take about 5 work-hours per product to comply with the basic requirements
of this proposed AD. The average labor rate is $80 per work-hour. Required
parts would cost about $0 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 AD on U.S. operators to be $274,400, or $400 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: