Document ID: FAA-2012-0420-0001
Agency: faa
Document Type: Proposed Rule
Title: Airworthiness Directives: Bombardier, Inc. Airplanes
Posted Date: 2012-04-19T04:00Z

[Federal Register Volume 77, Number 76 (Thursday, April 19, 2012)]
[Proposed Rules]
[Pages 23420-23425]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2012-9477]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2012-0420; Directorate Identifier 2011-NM-284-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 supersede an existing airworthiness directive 
(AD) that applies to certain Bombardier, Inc. Model CL-600-2B19 
(Regional Jet Series 100 & 440) airplanes. The existing AD currently 
requires revising certain sections of a certain airplane flight manual, 
deactivating certain hydraulic accumulators, removing certain hydraulic 
accumulators, ultrasonic inspections for cracks on accumulators and 
screw caps and replacement if necessary, and replacing certain 
accumulators. Since we issued that AD, we have determined that, for 
certain airplanes, reducing the compliance time for a certain 
replacement is necessary to ensure that the identified unsafe condition 
is addressed. This proposed AD would continue to require the existing 
actions from the existing AD. We are proposing this AD to detect and 
correct hydraulic accumulator screw cap/end cap failure, which could 
result in the loss of the associated hydraulic

[[Page 23421]]

system and high-energy impact damage to adjacent systems and structure, 
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; telephone 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 and Mechanical Systems Branch, ANE-171, FAA, New York Aircraft 
Certification Office (ACO), 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-2012-0420; 
Directorate Identifier 2011-NM-284-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 October 20, 2011, we issued AD 2011-23-08, Amendment 39-16859 
(76 FR 71241, November 17, 2011). That AD required actions intended to 
address an unsafe condition on certain Bombardier, Inc. Model CL-600-
2B19 (Regional Jet Series 100 & 440) Airplanes.
    Since we issued AD 2011-23-08, Amendment 39-16859 (76 FR 71241, 
November 17, 2011), we have determined that the compliance time 
specified in paragraph (n) of this proposed AD (referred to as 
paragraph (q) in AD 2011-23-08) must be clarified. We are including the 
phrase, ``whichever occurs first,'' in paragraph (n)(1) of this AD, 
which requires operators to perform the action at the earlier of the 
times. We have determined that the proposed reduced compliance time is 
necessary to address the identified unsafe condition in a timely 
manner. This compliance time also matches the compliance time given in 
Canadian Airworthiness Directive CF-2010-24, dated August 3, 2010.
    We have also determined that certain phrases need to be added and 
certain phrases need to be removed from certain credit paragraphs of 
this AD. We have revised paragraphs (o)(4) and (o)(5) of this proposed 
AD to specify ``before December 22, 2011 (the effective date of AD 
2011-23-08, Amendment 39-16859 (76 FR 71241, November 17, 2011)),'' 
instead of ``before November 4, 2010.'' We have revised paragraph 
(o)(2) of this AD by removing ``hydraulic system No. 1'' because the 
service information in paragraph (o)(2) does not specify to remove the 
hydraulic system No. 1 accumulator. We have also revised paragraph 
(o)(2) of this proposed AD by removing Bombardier Service Bulletin 
601R-32-107, Revision A, dated June 17, 2010, because credit for that 
service bulletin is already given in paragraph (m) of this proposed AD. 
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.

Changes to Existing AD

    This proposed AD would retain all requirements of AD 2011-23-08, 
Amendment 39-16859 (76 FR 71241, November 17, 2011). Since AD 2011-23-
08 was issued, the AD format has been revised, and certain paragraphs 
have been rearranged. As a result, the corresponding paragraph 
identifiers have changed in this proposed AD, as listed in the 
following table:

                      Revised Paragraph Identifiers
------------------------------------------------------------------------
                                                         Corresponding
Requirement in AD 2011-23-08, Amendment 39-16859 (76    requirement in
            FR 71241, November 17, 2011)               this  proposed AD
------------------------------------------------------------------------
paragraph (l).......................................   paragraph (p)(1)
paragraph (m).......................................   paragraph (p)(2)
paragraph (n).......................................   paragraph (p)(3)
paragraph (o).......................................      paragraph (l)
paragraph (p).......................................      paragraph (m)
paragraph (q).......................................      paragraph (n)
paragraph (r).......................................   paragraph (o)(4)
paragraph (s).......................................   paragraph (o)(5)
------------------------------------------------------------------------

    We have also revised paragraph (j) (paragraph (j) of AD 2011-23-08, 
Amendment 39-16859 (76 FR 71241, November 17, 2011)) of this proposed 
AD to refer to paragraph (k) of this AD instead of paragraph (l)(1) 
(paragraph (l) of AD 2011-23-08) for the applicable compliance times.

Differences Between This AD and the MCAI or Service Information

    The actions specified in Canadian Airworthiness Directive CF-2010-
24, dated August 3, 2010, apply only to Tactair accumulators. The 
actions required by paragraphs (h), (i), and (m) of this proposed AD 
apply to all accumulators in the positions specified in paragraphs (h), 
(i), and (l) of this proposed AD.
    While Canadian Airworthiness Directive CF-2010-24, dated August 3, 
2010, does not require replacement of the reducer of the hydraulic 
system No.

[[Page 23422]]

1 with a new reducer, paragraph (n) of this proposed AD does.

Costs of Compliance

    Based on the service information, we estimate that this proposed AD 
would affect about 605 products of U.S. registry.
    The actions that are required by AD 2011-23-08, Amendment 39-16859 
(76 FR 71241, November 17, 2011), and retained in this proposed AD take 
about 33 work-hours per product, at an average labor rate of $85 per 
work hour. Required parts cost about $3,054 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, the estimated cost of the currently required actions is $5,859 
per product.
    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) 2011-23-08, Amendment 39-16859 (76 FR 71241, November 17, 2011), 
and adding the following new AD:

Bombardier, Inc.: Docket No. FAA-2012-0420; Directorate Identifier 
2011-NM-284-AD.

(a) Comments Due Date

    We must receive comments by June 4, 2012.

(b) Affected ADs

    This AD supersedes AD 2011-23-08, Amendment 39-16859 (76 FR 
71241, November 17, 2011).

(c) Applicability

    This AD applies to Bombardier, Inc. Model CL-600-2B19 (Regional 
Jet Series 100 & 440) airplanes, certificated in any category, 
serial numbers 7003 and subsequent.

(d) Subject

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

(e) Reason

    This AD was prompted by reports of on-ground hydraulic 
accumulator screw cap/end cap failure. We are issuing this AD to 
detect and correct hydraulic accumulator screw cap/end cap failure, 
which could result in the loss of the associated hydraulic system 
and high-energy impact damage to adjacent systems and structure, and 
consequent loss of control 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) Retained Airplane Flight Manual (AFM) Revision, With Revised 
Service Information

    This paragraph restates the revision required by paragraph (g) 
of AD 2010-22-02, Amendment 39-16481 (75 FR 64636, October 20, 
2010), with revised service information. Within 30 days after 
November 4, 2010 (the effective date of AD 2010-22-02, Amendment 39-
16481 (75 FR 64636, October 20, 2010)), revise the Limitations 
section, Normal Procedures section, and Abnormal Procedures section 
of the Canadair Regional Jet AFM, CSP A-012, by incorporating 
Canadair Regional Jet Temporary Revision (TR) RJ/186-1, dated August 
24, 2010, into the applicable section of Canadair Regional Jet AFM, 
CSP A-012. Thereafter, except as provided by paragraph (p) of this 
AD, no alternative actions specified in Canadair Regional Jet TR RJ/
186-1, dated August 24, 2010, may be approved.

    Note 1 to paragraph (g) of this AD:  The actions required by 
paragraph (g) of this AD may be done by inserting a copy of Canadair 
Regional Jet TR RJ/186-1, dated August 24, 2010, into the applicable 
section of the Canadair Regional Jet AFM, CSP A-012. When this TR 
has been included in the general revisions of this AFM, the general 
revisions may be inserted into this AFM, and this TR removed, 
provided that the relevant information in the general revision is 
identical to that in Canadair Regional Jet TR RJ/186-1, dated August 
24, 2010.

(h) Retained Deactivation of the Hydraulic System No. 3 Accumulator, 
With Revised Service Information

    This paragraph restates the deactivation required by paragraph 
(h) of AD 2010-22-02, Amendment 39-16481 (75 FR 64636, October 20, 
2010), with revised service information. Within 250 flight cycles 
after November 4, 2010 (the effective date of AD 2010-22-02), 
deactivate the hydraulic system No. 3 accumulator, in accordance 
with Part A of the Accomplishment Instructions of Bombardier Alert 
Service Bulletin A601R-29-031, Revision A, dated March 26, 2009. 
Doing the removal of the hydraulic system No. 3 accumulator in 
paragraph (l) of this AD terminates the requirements of this 
paragraph. The actions in this paragraph apply to all accumulators 
in hydraulic system No. 3.

(i) Retained Removal of the Hydraulic System No. 2 Accumulator, With 
Revised Service Information

    This paragraph restates the removal required by paragraph (i) of 
AD 2010-22-02, Amendment 39-16481 (75 FR 64636, October 20, 2010), 
with revised service information. Within 500 flight cycles after 
November 4, 2010 (the effective date of AD 2010-22-02), remove the 
hydraulic system No. 2 accumulator, in accordance with the

[[Page 23423]]

Accomplishment Instructions of Bombardier Service Bulletin 601R-29-
032, Revision A, dated January 26, 2010. The actions in this 
paragraph apply to all accumulators in hydraulic system No. 2.

(j) Retained Initial and Repetitive Ultrasonic Inspections of Hydraulic 
System No. 1, Inboard Brake and Outboard Brake Accumulators, With 
Revised Service Information

    This paragraph restates the initial and repetitive ultrasonic 
inspections required by paragraph (k) of AD 2010-22-02, Amendment 
39-16481 (75 FR 64636, October 20, 2010), with revised service 
information. For hydraulic system No. 1, inboard brake and outboard 
brake accumulators having part number (P/N) 601R75138-1 (08-60163-
001 or 08-60163-002): At the applicable compliance times specified 
in paragraph (k) of this AD, do the inspections required by 
paragraphs (j)(1) and (j)(2) of this AD. Repeat the inspections for 
each accumulator having P/N 601R75138-1 (08-60163-001 or 08-60163-
002) thereafter at intervals not to exceed 500 flight cycles until 
the replacement specified in this paragraph is done or the 
replacement specified in paragraph (m) of this AD is done. If any 
crack is found, before further flight, replace the accumulator with 
a new accumulator having P/N 601R75138-1 (08-60163-001 or 08-60163-
002) and having the letter ``T'' after the serial number on the 
identification plate, in accordance with the Accomplishment 
Instructions of the applicable service bulletin identified in table 
1 or table 2 of this AD.
    (1) Do an ultrasonic inspection for cracks on each accumulator, 
in accordance with Part B of the Accomplishment Instructions of the 
applicable service bulletin identified in table 1 of this AD.

                       Table 1--Bombardier Service Information for Accumulator Inspection
----------------------------------------------------------------------------------------------------------------
         Accumulator                     Document                   Revision                    Date
----------------------------------------------------------------------------------------------------------------
Hydraulic System No. 1......  Bombardier Alert Service        B...................  May 11, 2010.
                               Bulletin A601R-29-029,
                               including Appendix A, dated
                               October 18, 2007.
Inboard and Outboard Brake..  Bombardier Alert Service        D...................  May 11, 2010.
                               Bulletin A601R-32-103,
                               including Appendix A,
                               Revision A, dated October 18,
                               2007.
----------------------------------------------------------------------------------------------------------------

    (2) Do an ultrasonic inspection for cracks on the screw cap, in 
accordance with the Accomplishment Instructions of the applicable 
service bulletin identified in table 2 of this AD.

                        Table 2--Bombardier Service Information for Screw Cap Inspection
----------------------------------------------------------------------------------------------------------------
         Accumulator                     Document                   Revision                    Date
----------------------------------------------------------------------------------------------------------------
Hydraulic System No. 1......  Bombardier Service Bulletin     A...................  May 11, 2010.
                               601R-29-033, including
                               Appendix A, dated May 5, 2009.
Inboard and Outboard Brake..  Bombardier Service Bulletin     A...................  May 11, 2010.
                               601R-32-106, including
                               Appendix A.
----------------------------------------------------------------------------------------------------------------

(k) Retained Initial and Repetitive Ultrasonic Inspections of Hydraulic 
System No. 1, Inboard Brake and Outboard Brake Accumulators, With 
Revised Service Information

    This paragraph restates the initial and repetitive ultrasonic 
inspections required by paragraph (l) of AD 2010-22-02, Amendment 
39-16481 (75 FR 64636, October 20, 2010), with revised service 
information. For hydraulic system No. 1 inboard brake, and outboard 
brake accumulators having P/N 601R75138-1 (08-60163-001 or 08-60163-
002): Do the inspections specified in paragraph (j) of this AD at 
the applicable time in paragraph (k)(1), (k)(2), and (k)(3) of this 
AD.
    (1) For any accumulator not having the letter ``T'' after the 
serial number on the identification plate and with more than 4,500 
flight cycles on the accumulator as of November 4, 2010 (the 
effective date of AD 2010-22-02, Amendment 39-16481 (75 FR 64636, 
October 20, 2010)): Inspect within 500 flight cycles after November 
4, 2010 (the effective date of AD 2010-22-02).
    (2) For any accumulator not having the letter ``T'' after the 
serial number on the identification plate and with 4,500 flight 
cycles or less on the accumulator as of November 4, 2010 (the 
effective date of AD 2010-22-02, Amendment 39-16481 (75 FR 64636, 
October 20, 2010)): Inspect prior to the accumulation of 5,000 
flight cycles on the accumulator.
    (3) If it is not possible to determine the flight cycles 
accumulated for any accumulator not having the letter ``T'' after 
the serial number on the identification plate: Inspect within 500 
flight cycles after November 4, 2010 (the effective date of AD 2010-
22-02, Amendment 39-16481 (75 FR 64636, October 20, 2010)).

    Note 2 to paragraph (j) of this AD:  For any accumulator having 
P/N 601R75138-1 (08-60163-001 or 08-60163-002) and the letter ``T'' 
after the serial number on the identification plate, or if the 
accumulator part number is not listed in paragraph (j) of this AD, 
the inspection specified in paragraph (j) of this AD is not 
required.

                    Table 3--Bombardier Credit Service Information for Accumulator Inspection
----------------------------------------------------------------------------------------------------------------
                Document                             Revision                              Date
----------------------------------------------------------------------------------------------------------------
Bombardier Alert Service Bulletin A601R- ...............................  October 18, 2007.
 29-029.
Bombardier Alert Service Bulletin A601R- A..............................  November 12, 2009.
 29-029.
Bombardier Alert Service Bulletin A601R- ...............................  November 21, 2006.
 32-103.
Bombardier Alert Service Bulletin A601R- A..............................  March 7, 2007.
 32-103.
Bombardier Alert Service Bulletin A601R- B..............................  October 18, 2007.
 32-103.
Bombardier Alert Service Bulletin A601R- C..............................  February 26, 2009.
 32-103.
----------------------------------------------------------------------------------------------------------------

[[Page 23424]]

 Table 4--Bombardier Credit Service Information for Screw Cap Inspection
------------------------------------------------------------------------
                 Document                               Date
------------------------------------------------------------------------
Bombardier Service Bulletin 601R-29-033..  May 5, 2009.
Bombardier Service Bulletin 601R-32-106..  May 5, 2009.
------------------------------------------------------------------------

(l) Retained Removal of the Hydraulic System No. 3 Accumulator, With No 
New Service Information

    This paragraph restates the removal required by paragraph (o) of 
AD 2011-23-08, Amendment 39-16859 (76 FR 71241, November 17, 2011), 
with reduced compliance time for paragraph (n) of this AD, and no 
new service information. Within 1,000 flight cycles after December 
22, 2011 (the effective date of AD 2011-23-08), remove the hydraulic 
system No. 3 accumulator, in accordance with Part B of the 
Accomplishment Instructions of Bombardier Alert Service Bulletin 
A601R-29-031, Revision A, dated March 26, 2009. Doing the action in 
this paragraph terminates the requirements of paragraph (h) of this 
AD.

(m) Retained Replacement of the Hydraulic System No. 1, Inboard Brake 
and Outboard Brake Accumulators, With No New Service Information

    This paragraph restates the replacement required by paragraph 
(p) of AD 2011-23-08, Amendment 39-16859 (76 FR 71241, November 17, 
2011), with reduced compliance time for paragraph (o) of this AD, 
and no new service information. Within 4,000 flight cycles or 24 
months after December 22, 2011 (the effective date of AD 2011-23-
08), whichever occurs first, replace any hydraulic system No. 1, 
inboard brake or outboard brake accumulator having P/N 601R75138-1 
(08-60163-001 or 08-60163-002), with a new accumulator having P/N 
601R75139-1 (11093-4), in accordance with the Accomplishment 
Instructions of the applicable service bulletin identified in table 
5 of this AD. Doing the action in this paragraph terminates the 
requirement for the inspections in paragraph (j) of this AD for that 
accumulator. As of December 22, 2011 (the effective date of AD 2011-
23-08), use only Bombardier Service Bulletin 601R-29-035, Revision 
A, dated December 8, 2010; or Bombardier Service Bulletin 601R-32-
107, Revision B, dated December 8, 2010; as applicable.

                                           Table 5--Bombardier Service Information for Accumulator Replacement
--------------------------------------------------------------------------------------------------------------------------------------------------------
              Accumulator                                Document                             Revision                              Date
--------------------------------------------------------------------------------------------------------------------------------------------------------
Hydraulic System No. 1................  Bombardier Service Bulletin 601R-29-035..  ..............................  May 11, 2010.
Hydraulic System No. 1................  Bombardier Service Bulletin 601R-29-035..  A.............................  December 8, 2010.
Inboard and Outboard Brake............  Bombardier Service Bulletin 601R-32-107..  A.............................  June 17, 2010.
Inboard and Outboard Brake............  Bombardier Service Bulletin 601R-32-107..  B.............................  December 8, 2010.
--------------------------------------------------------------------------------------------------------------------------------------------------------

(n) Retained Action for Airplanes on Which Bombardier Service Bulletin 
601R-29-035, Dated May 11, 2010, Is Done and Reducer Having P/N 
MS21916D8-6 is Installed, With No New Service Information

    This paragraph restates the action required by paragraph (q) of 
AD 2011-23-08, Amendment 39-16859 (76 FR 71241, November 17, 2011), 
with reduced compliance time for paragraph (n) of this AD, and no 
new service information. For airplanes on which Bombardier Service 
Bulletin 601R-29-035, dated May 11, 2010, is done, and reducer 
having P/N MS21916D8-6 is installed: At the later of the times 
specified in paragraph (n)(1) or (n)(2) of this AD: Replace the 
reducer of the hydraulic system No. 1 with a new reducer, in 
accordance with Part B of Bombardier Service Bulletin 601R-29-035, 
Revision A, dated December 8, 2010.
    (1) Within 1,200 flight cycles or 8 months after December 22, 
2011 (the effective date of AD 2011-23-08, Amendment 39-16859 (76 FR 
71241, November 17, 2011)), whichever occurs first.
    (2) Within 60 days after the effective date of this AD.

(o) Credit for Previous Actions

    (1) This paragraph provides credit for deactivating the 
hydraulic system No. 3 accumulator, as required by paragraph (h) of 
this AD, if the deactivation was performed before November 4, 2010 
(the effective date of AD 2010-22-02, Amendment 39-16481 (75 FR 
64636, October 20, 2010)) using Bombardier Alert Service Bulletin 
A601R-29-031, dated December 23, 2008.
    (2) This paragraph provides credit for removing the hydraulic 
system No. 2 accumulator as required by paragraph (i) of this AD, if 
the removal was performed before November 4, 2010 (the effective 
date of AD 2010-22-02, Amendment 39-16481 (75 FR 64636, October 20, 
2010)) using Bombardier Service Bulletin 601R-29-032, dated November 
12, 2009.
    (3) This paragraph provides credit for an ultrasonic inspection 
for cracks as required by paragraph (j) of this AD, if the 
ultrasonic inspection was performed before November 4, 2010 (the 
effective date of AD 2010-22-02, Amendment 39-16481 (75 FR 64636, 
October 20, 2010)), using the applicable service bulletin identified 
in table 3 of this AD, or the applicable service bulletin identified 
in table 4 of this AD.
    (4) This paragraph provides credit for removing the hydraulic 
system No. 3 accumulator as required by paragraph (l) of this AD, if 
the removal was performed before December 22, 2011 (the effective 
date of AD 2011-23-08, Amendment 39-16859 (76 FR 71241, November 17, 
2011)), using Bombardier Alert Service Bulletin A601R-29-031, dated 
December 23, 2008.
    (5) This paragraph provides credit for replacing any inboard 
brake or outboard brake accumulator as required by paragraph (m) of 
this AD, if the replacement was performed before December 22, 2011 
(the effective date of AD 2011-23-08, Amendment 39-16859 (76 FR 
71241, November 17, 2011)), using Bombardier Service Bulletin 601R-
32-107, dated May 11, 2010.

(p) 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, (ACO), 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 NYACO, 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. AMOCs approved previously in accordance with AD 
2010-22-02, Amendment 39-16481 (75 FR 64636, October 20, 2010), are 
approved as AMOCs for the corresponding provisions of this AD. AMOCs 
approved previously in accordance with AD 2011-23-08, Amendment 39-
16859 (76 FR 71241, November 17, 2011), are approved as AMOCs for 
the corresponding provisions of 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

[[Page 23425]]

of Design Authority (or their delegated agent). You are required to 
assure the product is airworthy before it is returned to service.

(q) Related Information

    Refer to MCAI Canadian Airworthiness Directive CF-2010-24, dated 
August 3, 2010; and the service bulletins specified in paragraphs 
(q)(1), (q)(2), (q)(3), (q)(4), (q)(5), (q)(6), (q)(7), (q)(8), and 
(q)(9) of this AD; for related information.
    (1) Canadair Regional Jet Temporary Revision RJ/186-1, dated 
August 24, 2010, to the Canadair Regional Jet Airplane Flight 
Manual, CSP A-012.
    (2) Bombardier Alert Service Bulletin A601R-29-029, Revision B, 
dated May 11, 2010, including Appendix A, dated October 18, 2007.
    (3) Bombardier Alert Service Bulletin A601R-29-031, Revision A, 
dated March 26, 2009.
    (4) Bombardier Alert Service Bulletin A601R-32-103, Revision D, 
dated May 11, 2010, including Appendix A, Revision A, dated October 
18, 2007.
    (5) Bombardier Service Bulletin 601R-29-032, Revision A, dated 
January 26, 2010.
    (6) Bombardier Service Bulletin 601R-29-033, Revision A, dated 
May 11, 2010, including Appendix A, dated May 5, 2009.
    (7) Bombardier Service Bulletin 601R-29-035, Revision A, dated 
December 8, 2010.
    (8) Bombardier Service Bulletin 601R-32-106, Revision A, 
including Appendix A, dated May 11, 2010.
    (9) Bombardier Service Bulletin 601R-32-107, Revision B, dated 
December 8, 2010.

    Issued in Renton, Washington, on April 11, 2012.
John P. Piccola,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.

[FR Doc. 2012-9477 Filed 4-18-12; 8:45 am]
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