DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2012-0335; Directorate Identifier 2011-NM-252-AD]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc. Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: We propose to revise an existing airworthiness directive (AD)
that applies to certain Bombardier Model CL-600-2B19 (Regional Jet
Series 100 & 440) airplanes; all Model CL-600-2C10 (Regional Jet Series
700, 701, & 702) airplanes; all Model CL-600-2D15 (Regional Jet Series
705) airplanes; and all Model CL-600-2D24 (Regional Jet Series 900)
airplanes. The existing AD currently requires replacing certain water
accumulator assemblies having a certain part installed on the pitot and
static lines of the air data computer (ADC). Since we issued that AD,
an error was discovered in one service document number, and we have
determined that credit for accomplishing actions in another erroneously
cited service document should be removed from that AD. This proposed AD
would correct the erroneous service document number and remove the
other erroneously cited service document from that AD. We are proposing
this AD to prevent pitot-static tubing from becoming partially or
completely blocked by water, which could result in erroneous airspeed
and altitude indications and consequent loss of control of the
airplane.

DATES: We must receive comments on this proposed AD by June 4, 2012.

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 W12-140, 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; phone: 514-855-5000; fax: 514-855-7401; email:
thd.crj@aero.bombardier.com; Internet: http://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 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: Cesar Gomez, Aerospace Engineer,
Airframe & Mechanical Systems Branch, ANE-171, New York Aircraft
Certification Office (ACO), FAA, 1600 Stewart Avenue, Suite 410,
Westbury, New York 11590; telephone (516) 228-7318; 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-2012-0335;
Directorate Identifier 2011-NM-252-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 September 28, 2011, we issued AD 2011-21-07, Amendment 39-16830
(76 FR 64801, October 19, 2011). That AD required actions intended to
address an unsafe condition on the products listed above.

Since we issued AD 2011-21-07, Amendment 39-16830 (76 FR 64801,
October 19, 2011), an error was discovered in the document number
specified in paragraph (i), "Credit for Actions Accomplished in
Accordance with Previous Service Information," of that AD. The
citation in that paragraph should have read "Bombardier Service
Bulletin 601R-34-147, Revision A, dated November 3, 2009."
Additionally, we have determined that "Bombardier Service Bulletin
670BA-34-147, dated April 1, 2009," was incorrectly included in AD
2011-21-07 and should be removed from paragraph (i), "Credit for
Actions Accomplished in Accordance with Previous Service Information,"
of that AD.

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.

Costs of Compliance

We estimate that this proposed AD affects 1,041 airplanes of U.S.
registry.

We estimate the following costs to comply with this proposed AD:

Estimated Costs

The new requirements of this proposed AD add no additional economic
burden.

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);

3. Will not affect intrastate aviation in Alaska; and

4. 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 airworthiness directive
(AD) 2011-21-07, Amendment 39-16830 (76 FR 64801, October 19, 2011),
and adding the following new AD: