[Federal Register Volume 77, Number 54 (Tuesday, March 20, 2012)]
[Proposed Rules]
[Pages 16193-16196]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2012-6622]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2012-0142; Directorate Identifier 2010-NM-275-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 adopt a new airworthiness directive (AD) for 
certain Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 
701, & 702), CL-600-2D15 (Regional Jet Series 705), and CL-600-2D24 
(Regional Jet Series 900) airplanes. This proposed AD was prompted by 
reports of failures of a hydraulic accumulator's screw-cap/end cap 
while on the ground that resulted in loss of use of that hydraulic 
system and in high-energy impact damage to adjacent systems and 
structures. This proposed AD would require an inspection for part 
numbers; repetitive inspections for any cracking of certain hydraulic 
system accumulators, and replacement, if necessary; and revising the 
maintenance program to include a life limit for certain hydraulic 
system accumulators. We are proposing this AD to prevent loss of use of 
a hydraulic system, which could result in reduced controllability of 
the airplane.

DATES: We must receive comments on this proposed AD by May 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; telephone 514-855-5000; fax 514-855-7401; email 
[email protected]; 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 and Mechanical Systems Branch, ANE-171, FAA, New York Aircraft 
Certification Office, 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-2012-0142; 
Directorate Identifier 2010-NM-275-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

    The Transport Canada Civil Aviation (TCCA), which is the aviation 
authority for Canada, has issued Canadian Airworthiness Directive CF-
2010-35R1, dated June 28, 2011 (referred to after this as ``the 
MCAI''), to correct an unsafe condition for the specified products. The 
MCAI states:

    Seven cases of on-ground hydraulic accumulator screw cap/end cap 
failure have been experienced on CL-600-2B19 aeroplanes resulting in 
loss of the associated hydraulic system and high-energy impact 
damage to adjacent systems and structure. The lowest number of 
flight cycles accumulated at the time of failure, to date, has been 
6,991 flight cycles.
    Although there have been no failures to date on any CL-600-2C10, 
CL-600-2D15 or CL-600-2D24 aeroplanes, similar accumulators to those 
installed on the CL-600-2B19, are installed. The part numbers (P/Ns) 
of the accumulators installed on CL-600-2C10, CL-600-2D15 and CL-
600-2D24 aeroplanes are 900096-1 (Hydraulic System No. 1 and 
Hydraulic System No. 2 accumulators), 900097-1 (Hydraulic System No. 
3 accumulator) and 08-60204-001 (Inboard Brake and Outboard Brake 
accumulators).
    A detailed analysis of the calculated line of trajectory of a 
failed screw cap/end cap for each of the accumulators has been 
conducted, resulting in the identification of

[[Page 16194]]

several areas where systems and/or structural components could 
potentially be damaged. Although all of the failures to date have 
occurred on the ground, an in-flight failure affecting such 
components could potentially have an adverse effect on the 
controllability of the aeroplane.
    This [Canadian] directive gives instructions to conduct [an 
inspection to determine if certain hydraulic accumulators are 
installed and, if necessary,] repetitive ultrasonic inspections [for 
cracking] of the Hydraulic System No. 1, Hydraulic System No. 2, 
Hydraulic System No. 3, Inboard Brake and Outboard Brake 
accumulators, P/Ns 900096-1, 900097-1, and 08-60204-001, that are 
not identified by the letter ``M'' or ``T'' after the S/N [serial 
number] on the identification plate.
* * * * *

    Required actions include revising the maintenance program to 
include a life limit for certain accumulators, and for airplanes on 
which cracking is found during an ultrasonic inspection, replacing the 
accumulator with a new accumulator containing the letter ``M'' or 
``T'', as applicable, after the serial number on the identification 
plate or with a new accumulator with a different part number, and 
eventual replacement of certain accumulators with new accumulators. You 
may obtain further information by examining the MCAI in the AD docket.

Relevant Service Information

    Bombardier has issued the following service information.
     Bombardier Alert Service Bulletin A670BA-29-011, Revision 
A, dated July 27, 2010, including Appendix A, Revision A, dated July 
26, 2010.
     Bombardier Alert Service Bulletin A670BA-29-012, including 
Appendix A, Revision A, dated July 27, 2010.
     Bombardier Service Bulletin A670BA-32-021, Revision C, 
dated July 27, 2010, including Appendix A, Revision A, dated October 
18, 2007.
     Bombardier Service Bulletin 670BA-29-013, Revision A, 
dated July 27, 2010, including Appendix A, dated January 29, 2010.
     Bombardier Service Bulletin 670BA-32-026, Revision A, 
dated July 27, 2010, including Appendix A, dated January 29, 2010.
     Bombardier Service Bulletin 670BA-29-014, dated December 
22, 2010.
     Bombardier Service Bulletin 670BA-29-015, dated December 
22, 2010.
     Bombardier Service Bulletin 670BA-32-028, dated December 
22, 2010.
     Tasks 29-11-11-000-801 and 29-11-11-400-801 of Section 
1.3, Safe Life Components, of Part 2, Airworthiness Limitations, of the 
Bombardier CL-600-2C10, CL-600-2D15, CL-600-2D24, CL-600-2E25 
Maintenance Requirements Manual, CSP B-053, Revision 11, dated October 
20, 2010.
    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.

Costs of Compliance

    Based on the service information, we estimate that this proposed AD 
would affect about 389 products of U.S. registry. We also estimate that 
it would take up to 21 work-hours per product to comply with the basic 
requirements of this proposed AD. The average labor rate is $85 per 
work-hour. Required parts would cost about $8,988 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 
parts. 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 up to $4,190,697, or $10,773 per product, per inspection cycle.
    In addition, we estimate that any necessary follow-on actions would 
take up to 7 work-hours and require parts costing $8,988, for a cost of 
$9,583 per product. We have no way of determining the number of 
products that may need these actions.

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 adding the following new AD:

Bombardier, Inc.: Docket No. FAA-2012-0142; Directorate Identifier 
2010-NM-275-AD.

[[Page 16195]]

(a) Comments Due Date

    We must receive comments by May 4, 2012.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to the airplanes identified in paragraphs (c)(1) 
and (c)(2) of this AD, certificated in any category.
    (1) Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 
701, & 702) airplanes, with serial number (S/N) 10003 through 10314 
inclusive.
    (2) Bombardier, Inc. Model CL-600-2D15 (Regional Jet Series 705) 
and CL-600-2D24 (Regional Jet Series 900) airplanes, with S/N 15001 
through 15259 inclusive.

(d) Subject

    Air Transport Association (ATA) of America Code 29: Hydraulic 
Power, and 32: Landing Gear.

(e) Reason

    This AD was prompted by reports of failures of a hydraulic 
accumulator's screw-cap/end cap while on the ground that resulted in 
loss of use of that hydraulic system and in high-energy impact 
damage to adjacent systems and structures. We are issuing this AD to 
prevent loss of use of a hydraulic system, which could result in 
reduced controllability of the airplane.

(f) Compliance

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

(g) Inspection for Part Numbers (P/Ns)

    At the applicable time specified in paragraphs (g)(1), (g)(2), 
and (g)(3) of this AD, inspect the hydraulic accumulators in the 
hydraulic systems No. 1, No. 2, and No. 3, and the inboard and 
outboard brake systems, to determine the part number of the 
accumulator. A review of airplane maintenance records is acceptable 
in lieu of this inspection if the part number of the accumulator can 
be conclusively determined from that review.
    (1) For an accumulator with more than 4,500 total flight cycles 
as of the effective date of this AD, inspect that accumulator within 
500 flight cycles after the effective date of this AD.
    (2) For an accumulator with 4,500 or less total flight cycles as 
of the effective date of this AD, inspect that accumulator before it 
has accumulated 5,000 total flight cycles.
    (3) If it is not possible to determine the total flight cycles 
accumulated on an accumulator, inspect that accumulator within 500 
flight cycles after the effective date of this AD.

(h) Inspection for Letter Designation After the Serial Number

    If, during an inspection required by paragraph (g) of this AD, 
an accumulator having P/N 900096-1 (for hydraulic systems No. 1 and 
No. 2 accumulators), 900097-1 (for hydraulic system No. 3 
accumulator), or 08-60204-001 (for inboard and outboard brake 
accumulators) is found, at the applicable time specified in 
paragraphs (g)(1), (g)(2), and (g)(3) of this AD, do an inspection 
of the identification plate on the hydraulic accumulator to 
determine if an ``M'' (for hydraulic system accumulators) or a ``T'' 
(for brake system accumulators) follows the serial number on the 
identification plate. A review of airplane maintenance records is 
acceptable in lieu of this inspection if the part number and the 
letter of the accumulator can be conclusively determined from that 
review.

    Note 1 to paragraphs (h), (i), (k), (l)(2), and (m): The letter 
``M'' after the serial number on the identification plate is 
applicable to accumulators, P/Ns 900096-1 and 900097-1, on hydraulic 
systems No. 1, No. 2, and No. 3. The letter ``T'' after the serial 
number on the identification plate is applicable to accumulators, P/
N 08-60204-001, on the brake system.

(i) Initial Ultrasonic Inspections of Hydraulic System No. 1, Hydraulic 
System No. 2, Hydraulic System No. 3, Inboard Brake, and Outboard Brake 
Accumulators

    If, during any inspection required by paragraph (h) of this AD, 
any accumulator without the letter ``M'' (for hydraulic system 
accumulators) or a ``T'' (for brake system accumulators) after the 
serial number is found, at the applicable time specified in 
paragraph (g)(1), (g)(2), or (g)(3) of this AD: Do an ultrasonic 
inspection of the inner shoulders of the accumulator screw-cap for 
cracking, in accordance with Part B of the Accomplishment 
Instructions of the applicable Bombardier service bulletin 
identified in paragraphs (i)(1), (i)(2), and (i)(3) of this AD, and 
at the internal threads of the screw-caps, in accordance with the 
Accomplishment Instructions of the applicable Bombardier service 
bulletin identified in paragraphs (i)(4), (i)(5), and (i)(6) of this 
AD.
    (1) For hydraulic system No. 1, and hydraulic system No. 2 
accumulators: Bombardier Alert Service Bulletin A670BA-29-011, 
Revision A, dated July 27, 2010, including Appendix A, Revision A, 
dated July 26, 2010.
    (2) For hydraulic system No. 3 accumulators: Bombardier Alert 
Service Bulletin A670BA-29-012, including Appendix A, Revision A, 
dated July 27, 2010.
    (3) For inboard brake, outboard brake accumulators: Bombardier 
Service Bulletin A670BA-32-021, Revision C, dated July 27, 2010, 
including Appendix A, Revision A, dated October 18, 2007.
    (4) For hydraulic system No. 1 accumulators: Bombardier Service 
Bulletin 670BA-29-013, Revision A, dated July 27, 2010, including 
Appendix A, dated January 29, 2010.
    (5) For hydraulic system No. 2 accumulators: Bombardier Service 
Bulletin 670BA-29-013, Revision A, dated July 27, 2010, including 
Appendix A, dated January 29, 2010.
    (6) For inboard brake, outboard brake accumulators: Bombardier 
Service Bulletin 670BA-32-026, Revision A, dated July 27, 2010, 
including Appendix A, dated January 29, 2010.

(j) No Cracking Found During Accomplishment of Paragraph (i) of This AD

    If no cracking is found during the inspections required by 
paragraph (i) of this AD, do the actions required by paragraph (l) 
of this AD.

(k) Any Cracking Found During Accomplishment of Paragraph (i) of This 
AD

    If any cracking is found during the inspections required by 
paragraph (i) of this AD, before further flight, replace the 
accumulator with a new accumulator containing the letter ``M'' or 
``T'', as applicable, after the serial number on the identification 
plate, in accordance with the Accomplishment Instructions of the 
applicable service bulletin identified in paragraphs (i)(1) through 
(i)(6) of this AD, or replace the accumulator with a new accumulator 
as specified in paragraphs (k)(1) through (k)(3) of this AD, as 
applicable.
    (1) For any cracked hydraulic system No. 1 or No. 2 accumulator, 
replace the cracked accumulator with a new accumulator, P/N 900121-
1, in accordance with the Accomplishment Instructions of Bombardier 
Service Bulletin 670BA-29-014, dated December 22, 2010.
    (2) For any cracked hydraulic system No. 3 accumulator, replace 
the cracked accumulator with a new accumulator, P/N 900122-1, in 
accordance with the replacement specified in paragraph (o) of this 
AD.
    (3) For any cracked inboard brake or outboard brake accumulator 
replaced the cracked accumulator with a new accumulator, P/N 
90006691, in accordance with the replacement specified in paragraph 
(p) of this AD.

(l) Repetitive Ultrasonic Inspections of Hydraulic System No. 1, 
Hydraulic System No. 2, Hydraulic System No. 3, Inboard Brake, and 
Outboard Brake Accumulators

    For each accumulator on which no cracking was found during any 
inspection required by paragraph (i) of this AD, within 500 flight 
cycles after the previous ultrasonic inspection, inspect the 
accumulator in accordance with paragraph (i) of this AD.
    (1) If no cracking is found, do the actions required by 
paragraph (l) of this AD and repeat thereafter at intervals not to 
exceed 500 flight cycles.
    (2) If any cracking is found, before further flight, replace the 
accumulator with a new accumulator containing the letter ``M'' or 
``T'', as applicable, after the serial number on the identification 
plate, in accordance with the Accomplishment Instructions of the 
applicable service bulletin identified in paragraphs (i)(1) through 
(i)(6) of this AD, or replace the accumulator with a new accumulator 
as specified in paragraphs (k)(1), (k)(2), and (k)(3) of this AD, as 
applicable.

(m) Replacement of Hydraulic System No. 1 and No. 2 Accumulators

    For airplanes on which a hydraulic system No. 1 or No. 2 
accumulator having P/N 900096-1 without the letter ``M'' after the 
serial number is installed: At the applicable time specified in 
paragraphs (m)(1) and (m)(2) of this AD, replace the accumulator

[[Page 16196]]

with a new one having P/N 900096-1 with the letter ``M'' after the 
serial number; or having P/N 900121-1, in accordance with the 
Accomplishment Instructions of Bombardier Service Bulletin 670BA-29-
014, dated December 22, 2010.
    (1) For an accumulator with more than 19,500 total flight cycles 
as of the effective date of this AD, replace that accumulator within 
500 flight cycles after accomplishing the most recent inspection 
required by paragraph (i) or (l) of this AD.
    (2) For an accumulator with 19,500 or less total flight cycles 
as of the effective date of this AD, replace that accumulator before 
it has accumulated 20,000 total flight cycles.
    (3) If it is not possible to determine the total flight cycles 
accumulated on an accumulator, replace that accumulator within 500 
flight cycles after accomplishing the most recent ultrasonic 
inspection required by paragraph (i) or (l) of this AD.

(n) Hydraulic System Safe Life Limit Introduction

    Within 60 days after the effective date or this AD, revise the 
maintenance program to include a safe life limit for the hydraulic 
system No. 1 and No. 2 accumulators, P/N 900096-1, by incorporating 
Tasks 29-11-11-000-801 and 29-11-11-400-801 of Section 1.3, Safe 
Life Components, of Part 2, Airworthiness Limitations, of the 
Bombardier CL-600-2C10, CL-600-2D15, CL-600-2D24, CL-600-2E25 
Maintenance Requirements Manual, CSP B-053, Revision 11, dated 
October 20, 2010.

(o) Replacement of Hydraulic System No. 3 Accumulator

    Within 4,000 flight cycles or 24 months after the effective date 
of this AD, whichever occurs first, replace any hydraulic system No. 
3 accumulator having P/N 900097-1 with a new accumulator having P/N 
900122-1, in accordance with the Accomplishment Instructions of 
Bombardier Service Bulletin 670BA-29-015, dated December 22, 2010.

(p) Replacement of Inboard or Outboard Brake System Accumulators

    Within 4,000 flight cycles or 24 months after the effective date 
of this AD, whichever occurs first, replace any inboard or outboard 
brake system accumulator having P/N 08-60204-001 with a new 
accumulator having P/N 90006691, in accordance with the 
Accomplishment Instructions of Bombardier Service Bulletin 670BA-32-
028, dated December 22, 2010.

(q) Credit for Actions Accomplished in Accordance With Previous Service 
Information

    (1) Actions done before the effective date of this AD using Part 
B of the Accomplishment Instructions of the Bombardier service 
bulletin identified in paragraph (q)(1)(i), (q)(1)(ii), (q)(1)(iii), 
(q)(1)(iv), or (q)(1)(v) of this AD is acceptable for compliance 
with the corresponding requirements of this AD.
    (i) Bombardier Alert Service Bulletin A670BA-29-011, dated 
October 18, 2007.
    (ii) Bombardier Alert Service Bulletin A670BA-29-012, dated 
March 13, 2008.
    (iii) Bombardier Alert Service Bulletin A670BA-32-021, dated 
November 21, 2006.
    (iv) Bombardier Alert Service Bulletin A670BA-32-021, Revision 
A, dated March 7, 2007.
    (v) Bombardier Alert Service Bulletin A670BA-32-021, Revision B, 
dated October 18, 2007.
    (2) Actions done before the effective date of this AD using the 
Accomplishment Instructions of Bombardier Service Bulletin 670BA-29-
013, dated January 29, 2010; or 670BA-32-026, dated January 29, 
2010; are acceptable for compliance with the corresponding 
requirements of this AD.

(r) Terminating Actions

    Accomplishing the actions required by paragraphs (m), (n), (o), 
and (p) of this AD terminates the requirements of this AD for the 
accumulator at that location only.

(s) Other FAA AD Provisions

    The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, New 
York Aircraft Certification Office, ANE-170, FAA, has the authority 
to approve AMOCs for this AD, if requested using the procedures 
found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your 
request to your principal inspector or local Flight Standards 
District Office, as appropriate. If sending information directly to 
the manager of the ACO, send it 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, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the local flight standards district office/certificate holding 
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.

(t) Related Information

    Refer to MCAI Canadian Airworthiness Directive CF-2010-35R1, 
dated June 28, 2011, and the service information identified in 
paragraphs (t)(1) through (t)(9) of this AD, for related 
information.
    (1) Bombardier Alert Service Bulletin A670BA-29-011, Revision A, 
dated July 27, 2010, including Appendix A, Revision A, dated July 
26, 2010.
    (2) Bombardier Alert Service Bulletin A670BA-29-012, including 
Appendix A, Revision A, dated July 27, 2010.
    (3) Bombardier Service Bulletin A670BA-32-021, Revision C, dated 
July 27, 2010, including Appendix A, Revision A, dated October 18, 
2007.
    (4) Bombardier Service Bulletin 670BA-29-013, Revision A, dated 
July 27, 2010, including Appendix A, dated January 29, 2010.
    (5) Bombardier Service Bulletin 670BA-32-026, Revision A, dated 
July 27, 2010, including Appendix A, dated January 29, 2010.
    (6) Bombardier Service Bulletin 670BA-29-014, dated December 22, 
2010.
    (7) Bombardier Service Bulletin 670BA-29-015, dated December 22, 
2010.
    (8) Bombardier Service Bulletin 670BA-32-028, dated December 22, 
2010.
    (9) Tasks 29-11-11-000-801 and 29-11-11-400-801 of Section 1.3, 
Safe Life Components, of Part 2, Airworthiness Limitations, of the 
Bombardier CL-600-2C10, CL-600-2D15, CL-600-2D24, CL-600-2E25 
Maintenance Requirements Manual, CSP B-053, Revision 11, dated 
October 20, 2010.

    Issued in Renton, Washington, on January 26, 2012.
Kalene C. Yanamura,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2012-6622 Filed 3-19-12; 8:45 am]
BILLING CODE 4910-13-P