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2019-08-08 BOMBARDIER, INC.: Amendment 39-19629; Docket No. FAA-2018-0790; Product Identifier 2018-NM-078-AD.
(a) EFFECTIVE DATE

    This AD is effective June 27, 2019.

(b) AFFECTED ADS

    This AD replaces AD 2010-14-05,  Amendment 39-16350 (75 FR 37994, July
    1, 2010) ("AD 2010-14-05").

(c) APPLICABILITY

    This AD applies to the Bombardier, Inc, airplanes, certificated in any
    category, identified in paragraphs (c)(1) through (c)(5) of this AD.

(1) Model CL-600-1A11 (600) airplanes,  serial  numbers  1004 through 1085
    inclusive.

(2) Model CL-600-2A12 (601) airplanes,  serial  numbers  3001 through 3066
    inclusive.

(3) Model  CL-600-2B16 airplanes  (601-3A Variant),  serial  numbers  5001
    through 5134 inclusive.

(4) Model  CL-600-2B16 airplanes  (601-3R Variant),  serial  numbers  5135
    through 5194 inclusive.

(5) Model CL-600-2B16 airplanes (604 Variant), serial numbers 5301 through
    5665 inclusive and 5701 through 5988 inclusive.

Note 1 to paragraph (c) of this AD: Certain Model CL-600-2B16(604 Variant)
airplanes might be referred to by the marketing designation CL-605.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 29, Hydraulic power.

(e) REASON

    This AD  was prompted  by reports  of on-ground  hydraulic accumulator
    screw  cap  or  end cap  failure  that  resulted in  the  loss  of the
    associated hydraulic system and  highenergy impact damage to  adjacent
    systems and structure.  We are issuing  this AD to  address failure of
    one of the brake accumulator  screw caps/end caps, which could  result
    in impact damage causing loss of both hydraulic systems No. 2 and  No.
    3, and the  consequent loss of  both braking and  nose wheel steering,
    the potential for a runway excursion, and damage to the airplane.

(f) COMPLIANCE

    Comply with this AD within the compliance times specified,  unless al-
    ready done.

(g) RETAINED PART NUMBER INSPECTION AND ACCUMULATOR REPLACEMENT,  WITH RE-
    VISED FORMATTING, SERVICE INFORMATION, AND AFFECTED PART NUMBERS

    This paragraph  restates the requirements of paragraph (g) of AD 2010-
    14-05, with revised formatting, service information, and affected part
    numbers. Do the following actions as applicable.

(1) Within 50 flight hours after August 5, 2010  (the effective date of AD
    2010-14-05),  inspect  to  determine  the  part numbers  of the system
    accumulators numbers 1, 2, and 3, and brake accumulators numbers 2 and
    3 that are installed on the airplane. A review of airplane maintenance
    records is acceptable in lieu of this inspection if the part number of
    each accumulator can be conclusively determined  from that review.  If
    all of the installed accumulators have part number  (P/N) 2770571-102,
    2770571-103,  2770571-104,  2770571-105,  601R75139-3  (11094-4),   or
    601R75139-1 (11093-4),  no further action is required by paragraph (g)
    of this AD.

(2) Except as provided in paragraph (g)(1)  of this AD:  At the applicable
    time in paragraph (g)(2)(i), (g)(2)(ii) or (g)(2)(iii) of this AD, re-
    place the accumulator with a new, overhauled, or refurbished accumula-
    tor with the same part number,  in accordance  with the Accomplishment
    Instructions of the applicable service bulletin listed  in figure 1 to
    paragraphs (g)(2) and (g)(3) of this AD.

(i) For each accumulator having P/Ns 08-60163-002 (601R75138-1),  and  08-
    60164-002 (601R75138-3), as applicable, that has accumulated more than
    3,650 total flight cycles as of August 5, 2010  (the effective date of
    AD 2010-14-05): Replace the accumulator within 100 flight cycles after
    August 5, 2010.

(ii) For  each accumulator having P/N 08-60163-002 (601R75138-1),  and 08-
     60164-002 (601R75138-3),  as  applicable,  that has accumulated 3,650
     total flight cycles or fewer as of August 5, 2010:  Replace the accu-
     mulator before the accumulation of 3,750 total flight cycles  on  the
     accumulator.

(iii) For each accumulator having P/N 08-60163-002 (601R75138-1),  and 08-
      60164-002 (601R75138-3), as applicable, for which it is not possible
      to determine  the number of flight cycles accumulated:  Replace  the
      accumulator within 100 flight cycles after August 5, 2010.

    FIGURE 1 TO PARAGRAPHS (G)(2) AND (G)(3) OF THIS AD –SERVICE BULLETINS
                                                         FOR ACCUMULATOR  
                                                         REPLACEMENT      
    ______________________________________________________________________
                          BOMBARDIER
    AIRPLANE MODEL        SERVICE BULLETIN      REVISION       DATED
    ______________________________________________________________________
    CL-600-1A11 (600)       600-0742               04       June 11, 2015

    CL-600-2A12 (601)       601-0597               04       June 11, 2015
    CL-600-2B16 (601-3A
    and 601-3R Variants)

    CL-600-2B16 (604        604-29-008             04       June 11, 2015
    Variant)

    CL-600-2B16 (605*)      605-29-001             04       June 10, 2015
    ______________________________________________________________________
    *Model CL-600-2B16 (604 Variant),  referred to by the marketing desig-
     nation CL-605.

(3) Thereafter,  before  the  accumulation of 3,750 total flight cycles on
    any accumulator having P/Ns 08-60163-002 (601R75138-1),  and 08-60164-
    002 (601R75138-3), as applicable,  replace the accumulator with a new,
    overhauled, or refurbished accumulator having the same part number, in
    accordance  with  the  Accomplishment Instructions  of the  applicable
    service bulletin listed in figure 1 to paragraphs (g)(2) and (g)(3) of
    this AD.

(h) NEW PROVISION OF THIS AD: TERMINATING ACTION FOR CERTAIN ACCUMULATORS

    For  each  accumulator  with  one of the part number and serial number
    (S/N) suffixes listed in paragraphs (h)(1) through (h)(4)  of this AD,
    the repetitive replacement specified  in  paragraphs (g)(2) and (g)(3)
    of this AD is not required.

(1) P/N 08-60163-002 with S/N suffix TNAE.

(2) P/N 08-60164-002 with S/N suffix TNAE.

(3) P/N 601R75139-3 (11094-4).

(4) P/N 601R75139-1 (11093-4).

(i) NEW REQUIREMENT OF THIS AD: RELOCATION OF ACCUMULATORS

    Within 60 months or 2,400 flight cycles, whichever occurs first  after
    the  effective  date  of  this  AD,  relocate  the  hydraulic   system
    accumulators as specified in paragraphs (i)(1) through (i)(4) of  this
    AD, as applicable. Relocation of the hydraulic system accumulators  as
    required  by  this  paragraph   does  not  terminate  any   repetitive
    replacement required by paragraph (g)(2) or (g)(3) of this AD.

(1) For  Model CL-600-1A11 (600) airplanes,  S/Ns 1004 through 1085 inclu-
    sive:  Relocate accumulators as specified  in paragraphs (i)(1)(i) and
    (i)(1)(ii) of this AD.

(i) Relocate  hydraulic system  Nos. 1 and 2 accumulators,  in  accordance
    with  the  Accomplishment Instructions  of Bombardier Service Bulletin
    600-0764, dated October 8, 2015.

(ii) Relocate hydraulic system No. 3 accumulator,  in accordance  with the
     Accomplishment Instructions of Bombardier Service Bulletin  600-0767,
     dated August 25, 2016.

(2) For  Model CL-600-2A12 (601) airplanes,  S/Ns 3001 through 3066 inclu-
    sive,  and  Model CL-600-2B16 (601-3A and 601-3R Variants)  airplanes,
    S/Ns 5001 through 5194 inclusive:  Relocate accumulators  as specified
    in paragraphs (i)(2)(i) and (i)(2)(ii) of this AD.

(i) Relocate  hydraulic system Nos. 1 and 2  accumulators,  in  accordance
    with  the  Accomplishment Instructions of Bombardier  Service Bulletin
    601-0633, dated October 8, 2015.

(ii) Relocate hydraulic system No. 3 accumulator,  in accordance  with the
     Accomplishment Instructions of Bombardier  Service Bulletin 601-0637,
     dated August 25, 2016.

(3) For Model CL-600-2B16 (604 Variant) airplanes,  S/Ns 5301 through 5665
    inclusive: Relocate hydraulic system No. 3 accumulator,  in accordance
    with  the  Accomplishment Instructions of Bombardier  Service Bulletin
    604-29-013, Revision 02, dated April 18, 2016.

(4) For  Model CL-600-2B16 (605) airplanes,  S/Ns 5701 through 5982 inclu-
    sive and subsequent  (i.e., Model CL-600-2B16 (604 Variant),  referred
    to by the marketing designation CL-605): Relocate hydraulic system No.
    3 accumulator,  in accordance  with the Accomplishment Instructions of
    Bombardier Service Bulletin 605-29-006,  Revision 02,  dated April 19,
    2016.

(j) NEW REQUIREMENT OF THIS AD: REVISION OF MAINTENANCE/INSPECTION PROGRAM

    Within 50 flight hours after the effective date of this AD, revise the
    maintenance or inspection program,  as applicable,  to incorporate the
    tasks specified in figure 2 to paragraph (j) of this AD.

     FIGURE 2 TO PARAGRAPH (J) OF THIS AD: TIME LIMITS/MAINTENANCE CHECKS 
                                           (TLMC) TASKS                   
    ______________________________________________________________________
    AIRPLANE
    MODEL        TLMC MANUAL NUMBER     SECTION    PART NUMBER/TASK NUMBER
    ______________________________________________________________________
    CL-600-1A11   Bombardier Challenger   5-10-20,   601R75138-1
    (600)         600 Time                Time       (08-60163-002) with
                  Limits/Maintenance      Limits     "TNAE" after the S/N
                  Checks, PSP 605,        (Systems)
                  Revision 39, dated                 601R75138-3
                  January 8, 2018                    (08-60164-002) with
                                                     "TNAE" after the S/N

    CL-600-2A12   Bombardier Challenger   5-10-20,   601R75138-1
    (601)         601 Time                Time       (08-60163-002) with
                  Limits/Maintenance      Limits     "TNAE" after the S/N
                  Checks, PSP 601-5,      (Systems)
                  Revision 46, dated                 601R75138-3
                  January 8, 2018                    (08-60164-002) with
                                                     "TNAE" after the S/N

    CL-600-2B16   Bombardier Challenger   5-10-20,   601R75138-1
    (601-3A and   601 Time                Time       (08-60163-002) with
    601-3R        Limits/Maintenance      Limits     "TNAE" after the S/N
    Variants)     Checks, PSP 601A-5,     (Systems)
                  Revision 42, dated                 601R75138-3
                  January 8, 2018                    (08-60164-002) with
                                                     "TNAE" after the S/N

    CL-600-2B16   Bombardier Challenger   5-10-11,   29-10-00-101
    (604 Variant) CL-604 Time             Life
                  Limits/Maintenance      Limits     29-10-00-102
                  Checks, Part 2,         (Systems)
                  Airworthiness
                  Limitations, Revision
                  31, dated November 19,
                  2018

    CL-600-2B16   Bombardier Challenger   5-10-11,   29-10-00-101
    (605*)        CL-605 Time             Life
                  Limits/Maintenance      Limits     29-10-00-102
                  Checks, Part 2,         (Systems)
                  Airworthiness
                  Limitations, Revision
                  20, dated November 19,
                  2018
    ______________________________________________________________________
    *Model CL-600-2B16 (604 Variant),  referred to by the marketing desig-
     nation CL-605.

(k) NO ALTERNATIVE ACTIONS OR INTERVALS

    After the maintenance  or  inspection program  has been revised as re-
    quired by  paragraph (j)  of this  AD,  no alternative actions  (e.g.,
    inspections) or intervals may be used unless the actions or  intervals
    are  approved  as  an  alternative  method  of  compliance  (AMOC)  in
    accordance with the procedures  specified in paragraph (n)(1)  of this
    AD.

(l) CREDIT FOR PREVIOUS ACTIONS

(1) Replacement of an accumulator  with a new accumulator  having the same
    part number is also acceptable for compliance with the requirements of
    paragraphs (g)(2) and (g)(3) of this AD, if done before August 5, 2010
    (the effective date of AD 2010-14-05),  in accordance with the applic-
    able service bulletin listed in figure 3 to paragraph (l)(1)  of  this
    AD.  This service information is not incorporated by reference in this
    AD.

     FIGURE 3 TO PARAGRAPH (L)(1) OF THIS AD – PREVIOUS SERVICE BULLETINS 
                                               FOR AD 2010-14-05          
    ______________________________________________________________________
                          BOMBARDIER
    AIRPLANE MODEL        SERVICE BULLETIN      REVISION       DATED
    ______________________________________________________________________
    CL-600-1A11             600-0742            Basic    November 10, 2008
    (600)                                       01       July 6, 2009

    CL-600-2A12             601-0597            Basic    November 10, 2008
    (601)                                       01       July 6, 2009
    CL-600-2B16
    (601-3A and
    601-3R Variants)

    CL-600-2B16 (604        604-29-008          Basic    November 10, 2008
    Variant)                                    01       July 6, 2009

    CL-600-2B16             605-29-001          Basic    November 10, 2008
    (605*)                                      01       July 6, 2009
    ______________________________________________________________________
    *Model CL-600-2B16 (604 Variant),  referred to by the marketing desig-
     nation CL-605.

(2) Replacement of an accumulator  with a new accumulator  having the same
    part number is also acceptable for compliance with the requirements of
    paragraphs (g)(2) and (g)(3) of this AD, if done before the  effective
    date of  this AD  in accordance  with the  applicable service bulletin
    listed in figure 4 to paragraph (l)(2) of this AD.

     FIGURE 4 TO PARAGRAPH (L)(2) OF THIS AD – PREVIOUS SERVICE BULLETINS 
                                               FOR THIS AD                
    ______________________________________________________________________
                          BOMBARDIER
    AIRPLANE MODEL        SERVICE BULLETIN      REVISION       DATED
    ______________________________________________________________________
    CL-600-1A11 (600)       600-0742              02**     May 10, 2010
                                                  03*      April 10, 2012

    CL-600-2A12 (601)       601-0597              02**     May 10, 2010
    CL-600-2B16                                   03*      April 10, 2012
    (601-3A and 601-3R
    Variants)

    CL-600-2B16 (604        604-29-008            02**     May 10, 2010
    Variant)                                      03*      April 10, 2012

    CL-600-2B16             605-29-001            02**     May 10, 2010
    (605***)                                      03*      April 10, 2012
    ______________________________________________________________________
    *This service information is not incorporated by reference in this AD.
    **This service information was incorporated by reference in AD 2010-14
      -05.
    ***Model CL-600-2B16 (604 Variant),  referred to by the marketing des-
       ignation CL-605.

(3) This paragraph provides credit  for actions required  by paragraph (i)
    (3) of this AD,  if those actions were performed  before the effective
    date of this AD, in accordance with Bombardier Service Bulletin 604-29
    -013, dated April 30, 2015; or Bombardier Service Bulletin 604-29-013,
    Revision 01,  dated October 19, 2015.  This service information is not
    incorporated by reference in this AD.

(4) This paragraph provides credit  for actions required  by paragraph (i)
    (4) of this AD,  if those actions were performed  before the effective
    date of this AD, in accordance with Bombardier Service Bulletin 605-29
    -006, dated April 30, 2015; or Bombardier Service Bulletin 605-29-006,
    Revision 01,  dated October 19, 2015.  This service information is not
    incorporated by reference in this AD.

(5) For Model CL-600-2B16 (604 Variant) airplanes: This paragraph provides
    credit for the actions required by paragraph (j) of this AD,  if those
    actions were performed  before the effective date  of  this  AD  using
    Section 5-10-11,  Life Limits (Systems),  of the Bombardier Challenger
    CL-604 Time Limits/Maintenance Checks,  Part 2,  Airworthiness Limita-
    tions, Revision 30,  dated December 4, 2017.  This service information
    is not incorporated by reference in this AD.

(6) For Model CL-600-2B16 (605) airplanes:  This paragraph provides credit
    for the actions required  by  paragraph (j) of this AD for,  if  those
    actions were performed  before  the  effective  date  of this AD using
    Section 5-10-11,  Life Limits (Systems),  of the Bombardier Challenger
    CL-605 Time Limits/Maintenance Checks,  Part 2,  Airworthiness Limita-
    tions, Revision 18, dated December 4, 2017;  or Revision 19, dated May
    29, 2018. This service information is not incorporated by reference in
    this AD.

(m) SPECIAL FLIGHT PERMIT

    Special  flight  permits  may  be  issued  in accordance with sections
    21.197  and 21.199 of the Federal Aviation Regulations  (14 CFR 21.197
    and 21.199)  to operate the airplane to a location  where the airplane
    can be modified, provided the following conditions are met:

(1) An engineering recommendation  must  be  obtained  via  the Bombardier
    process Service Request for Product Support Action (SRPSA)  at  SRPSA@
    aero.bombardier.com.

(2) Approval of the special flight permit must be obtained from the Flight
    Standards District Office.

(n) OTHER FAA AD PROVISIONS

(1) Alternative Methods of Compliance (AMOCs):  The Manager,  New York ACO
    Branch,  FAA,  has the authority to approve AMOCs for this AD,  if re-
    quested 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 informa-
    tion directly to the manager of the certification office,  send  it to
    ATTN Program Manager, Continuing Operational Safety, FAA, New York ACO
    Branch.

(i) Before using any approved AMOC,  notify your appropriate principal in-
    spector,  or  lacking a principal inspector,  the manager of the local
    flight standards district office/certificate holding district office.

(ii) AMOC 15-76R1 and AMOC 15-53,  approved previously  for AD 2010-14-05,
     are approved as AMOCs for the corresponding provisions  of  paragraph
     (g)(2) of this AD.

(2) Contacting the Manufacturer:  For any requirement in this AD to obtain
    corrective  actions   from  a   manufacturer,  the   action  must   be
    accomplished using  a method  approved by  the Manager,  New York  ACO
    Branch,  FAA;   or  Transport   Canada  Civil   Aviation  (TCCA);   or
    Bombardier’s TCCA Design Approval Organization  (DAO).  If approved by
    the DAO, the approval must include the DAO-authorized signature.

(o) RELATED INFORMATION

(1) Refer   to   Mandatory  Continuing  Airworthiness  Information  (MCAI)
    Canadian AD CF-2009-39R1, dated October 13, 2017, for related informa-
    tion. This MCAI may be found in the AD docket on the Internet at http:
    //www.regulations.gov by searching for  and  locating  Docket No. FAA-
    2018-0790.

(2) For more information about this AD, contact Darren Gassetto, Aerospace
    Engineer,  Mechanical Systems & Administrative Services, FAA, New York
    ACO Branch,  1600 Stewart Avenue, Suite 410, Westbury, NY 11590; tele-
    phone 516-228-7323; fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov.

(3) Service information  identified in this AD that is not incorporated by
    reference is available at the addresses specified in paragraphs (p)(5)
    and (p)(6) of this AD.

(p) MATERIAL INCORPORATED BY REFERENCE

(1) The Director of the Federal Register  approved  the  incorporation  by
    reference (IBR) of  the service information  listed in this  paragraph
    under 5 U.S.C. 552(a) and 1 CFR part 51.

(2) You must use  this service information as applicable to do the actions
    required by this AD, unless the AD specifies otherwise.

(3) The following service information  was  approved  for  IBR on June 27,
    2019.

(i) Bombardier Service Bulletin 600-0742 Revision 04, dated June 11, 2015.

(ii) Bombardier Service Bulletin 600-0764, dated October 8, 2015.

(iii) Bombardier Service Bulletin 600-0767, dated August 25, 2016.

(iv) Bombardier Service Bulletin 601-0597 Revision 04 dated June 11, 2015.

(v) Bombardier Service Bulletin 601-0633, dated October 8, 2015.

(vi) Bombardier Service Bulletin 601-0637, dated August 25, 2016.

(vii) Bombardier Service Bulletin 604-29-008,  Revision 04, dated June 11,
      2015.

(viii) Bombardier Service Bulletin 604-29-013 Revision 02, dated April 18,
       2016.

(ix) Bombardier Service Bulletin 605-29-001,  Revision 04,  dated June 10,
     2015.

(x) Bombardier Service Bulletin 605-29-006,  Revision 02,  dated April 19,
    2016.

(xi) Section 5-10-11, Life Limits (Systems),  of the Bombardier Challenger
     CL-604 Time Limits/Maintenance Checks, Part 2,  Airworthiness Limita-
     tions, Revision 31, dated November 19, 2018.

(xii) Section 5-10-11, Life Limits (Systems), of the Bombardier Challenger
      CL-605 Time Limits/Maintenance Checks, Part 2, Airworthiness Limita-
      tions, Revision 20, dated November 19, 2018.

(xiii) Section 5-10-20, Time Limits (Systems) of the Bombardier Challenger
       600 Time Limits/Maintenance Checks,  PSP  605,  Revision 39,  dated
       January 8, 2018.

(xiv) Section 5-10-20, Time Limits (Systems), of the Bombardier Challenger
      601 Time Limits/Maintenance Checks,  PSP 601-5,  Revision 46,  dated
      January 8, 2018.

(xv) Section 5-10-20, Time Limits (Systems),  of the Bombardier Challenger
     601 Time Limits/Maintenance Checks,  PSP 601A-5,  Revision 42,  dated
     January 8, 2018.

(4) For service information identified in this AD, contact Bombardier, Inc
    200 Côte-Vertu Road West, Dorval, Québec H4S 2A3 Canada; North America
    toll-free telephone 1-866-538-1247 or direct-dial telephone 1-514-855-
    2999; email ac.yul@aero.bombardier.com; Internet http://www.bombardier
    .com.

(5) You may view this service information at the FAA,  Transport Standards
    Branch,  2200 South 216th St., Des Moines, WA.  For information on the
    availability of this material at the FAA, call 206-231-3195.

(6) You  may  view  this  service  information  that  is  incorporated  by
    reference at the National Archives and Records Administration  (NARA).
    For information  on the  availability of  this material at NARA,  call
    202-741-6030,  or go to: http://www.archives.gov/federal-register/cfr/
    ibr-locations.html.

Issued in Des Moines, Washington on April 25, 2019. Dionne Palermo, Acting
Director, System Oversight Division, Aircraft Certification Service

FOR FURTHER INFORMATION CONTACT:  Darren  Gassetto,   Aerospace  Engineer,
Mechanical Systems & Administrative Services,  FAA,  New York  ACO Branch,
1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7323
fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2018-0790; Product Identifier 2018-NM-078-AD; Amendment
39-19629; AD 2019-08-08]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: We are superseding Airworthiness Directive (AD) 2010-14-05,
which applied to certain Bombardier, Inc., Model CL-600-1A11 (600), CL-
600-2A12 (601), and CL-600-2B16 (601-3A, 601-3R, and 604 Variants)
airplanes. AD 2010-14-05 required inspection for the part numbers of
the system and brake accumulators, and repetitive replacement of
affected accumulators. This AD adds requirements for relocating the
accumulators and revising the existing maintenance or inspection
program to incorporate new or more restrictive airworthiness
limitations. This AD also adds optional terminating action for certain
airplanes. This AD was prompted by reports of on-ground hydraulic
accumulator screw cap or end cap failure that resulted in the loss of
the associated hydraulic system and high-energy impact damage to
adjacent systems and structure. We are issuing this AD to address the
unsafe condition on these products.

DATES: This AD is effective June 27, 2019.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of June 27,
2019.

ADDRESSES: For service information identified in this final rule,
contact Bombardier, Inc., 200 Cote-Vertu Road West, Dorval,
Quebec H4S 2A3, Canada; North America toll-free telephone 1-866-
538-1247 or direct-dial telephone 1-514-855-2999; email
ac.yul@aero.bombardier.com; internet http://www.bombardier.com. You may
view this service information at the FAA, Transport Standards Branch,
2200 South 216th St., Des Moines, WA. For information on the
availability of this material at the FAA, call 206-231-3195. It is also
available on the internet at http://www.regulations.gov by searching
for and locating Docket No. FAA-2018-0790.

Examining the AD Docket

You may examine the AD docket on the internet at http://www.regulations.
gov by searching for and locating Docket No. FAA-2018-
0790; or in person at Docket Operations between 9 a.m. and 5 p.m.,
Monday through Friday, except Federal holidays. The AD docket contains
this final rule, the regulatory evaluation, any comments received, and
other information. The address for Docket Operations (phone: 800-647-
5527) is U.S. Department of Transportation, Docket Operations, M-30,
West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE,
Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Darren Gassetto, Aerospace Engineer,
Mechanical Systems & Administrative Services, FAA, New York ACO Branch,
1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-
7323; fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov.

SUPPLEMENTARY INFORMATION:

Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR
part 39 to supersede AD 2010-14-05, Amendment 39-16350 (75 FR 37994,
July 1, 2010) (``AD 2010-14-05''). AD 2010-14-05 applied to certain
Bombardier, Inc., Model CL-600-1A11 (600), CL-600-2A12 (601), and CL-
600-2B16 (601-3A, 601-3R, and 604 Variants) airplanes. The NPRM
published in the Federal Register on September 14, 2018 (83 FR 46670).
The NPRM was prompted by reports of on-ground hydraulic accumulator
screw cap or end cap failure that resulted in the loss of the
associated hydraulic system and high-energy impact damage to adjacent
systems and structure. The NPRM proposed to continue to require
inspection for the part numbers of the system and brake accumulators,
and repetitive replacement of affected accumulators. The NPRM also
proposed to require relocating the accumulators and revising the
existing maintenance or inspection program to incorporate new or more
restrictive airworthiness limitations. The NPRM also proposed to add
optional terminating action for certain airplanes. We are issuing this
AD to address failure of one of the brake accumulator screw caps/end
caps, which could result in impact damage causing loss of both
hydraulic systems No. 2 and No. 3, and the consequent loss of both
braking and nose wheel steering, the potential for a runway excursion,
and damage to the airplane.
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian AD CF-2009-39R1, dated
October 13, 2017 (referred to after this as the Mandatory Continuing
Airworthiness Information, or ``the MCAI''), to correct an unsafe
condition for certain Bombardier, Inc., Model CL-600-1A11 (600), CL-
600-2A12 (601), and CL-600-2B16 (601-3A, 601-3R, and 604 Variants)
airplanes. The MCAI states:

Seven cases of on-ground hydraulic accumulator screw cap or end
cap failure have been experienced on CL-600-2B19 (CRJ) aircraft,
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 6991 flight cycles.
Although there have been no failures to date on any CL-600-1A11,
CL-600-2A12 or CL-600-2B16 aircraft, the same accumulators as those
installed on the CL-600-2B19, Part Numbers (P/N) 08-60163-002 and
08-60164-002 are installed on some of the aircraft listed in the
Applicability section of this directive.
Notes:
1. Earlier accumulators, P/Ns 2770571-102, 2770571-103, 2770571-
104 and 2770571-105, were installed in production on the following
aircraft: CL-600-1A11 [all Serial Numbers (S/Ns)], CL-600-2A12 (all
S/Ns) and CL-600-2B16 (S/Ns 5001 through 5194 and 5301 through 5524
only). These accumulators do not require inspection or replacement.
However, if any of the accumulators with the above P/Ns have been
replaced in-service by P/Ns 08-60163-002 and 08-60164-002, these
latter accumulators require replacement.

2. Prior to issuance of [Canadian] AD CF-2009-39, the only
accumulators ever installed in production on CL-600-2B16 aircraft,
S/Ns 5525 through 5665 and 5701 through 5908, are P/Ns 08-60163-002
and 08-60164-002; these accumulators require replacement.
3. After issuance of [Canadian] AD CF-2009-39 [which corresponds
to FAA AD 2010-14-05], accumulators with P/Ns specified in Note 2,
above, began to feature various S/N suffixes. Only accumulators with
S/N suffix ``TNAE'' do not require replacement, but they are subject
to other mandatory actions detailed in this AD.
4. Stainless steel accumulators P/Ns 601R75139-3 (11094-4) and
601R75139-1 (11093-4) were installed in production on CL-600-2B16
aircraft, S/Ns 5909 and subsequent. These accumulators do not
require replacement, but they are subjected to other mandatory
actions detailed in this AD.
A detailed analysis of the systems and structure in the
potential line of trajectory of a failed screw cap/end cap for each
accumulator, P/Ns 08-60163-002 and 08-60164-002, has been conducted.
On the Challengers, it has been identified that the worst case
scenario would be a failure of system No. 1, 2 or 3 accumulator
screw caps/end caps (depending on the model), resulting in a
potential uncontrolled fire in a non-designated fire zone.
The original version of this [Canadian] AD gave instructions to
perform identification and records checks, where applicable, and
replace accumulators, P/Ns 08-60163-002 and 08-60164-002 within the
time compliance specified.
* * * * *
You may examine the MCAI in the AD docket on the internet at http://
www.regulations.gov by searching for and locating Docket No. FAA-2018-
0790.

Comments

We gave the public the opportunity to participate in developing
this AD. The following presents the comments received on the NPRM and
the FAA's response to each comment.

Request To Refer to Latest Service Information

Bombardier requested that we refer to the latest version of the
service information: Bombardier Challenger CL-605 Time Limits/
Maintenance Checks (TLMC), Revision 19, dated May 29, 2018.
We agree to refer to the latest service information. The specific
tasks required by paragraph (j) of this AD have not changed in the
latest available service information. The current version of the
Bombardier Challenger CL-605 Time Limits/Maintenance Checks, Part 2,
Airworthiness Limitations, is Revision 20, dated November 19, 2018. We
have changed all references accordingly in this final rule, with credit
provided in paragraph (l)(6) of this AD for the prior accomplishment of
Revision 18, dated December 4, 2017, and Revision 19, dated May 29,
2018.
The current version of the Bombardier Challenger CL-604 Time
Limits/Maintenance Checks, Part 2, Airworthiness Limitations, is
Revision 31, dated November 19, 2018. We have changed all references
accordingly in this final rule, with credit provided in paragraph
(l)(5) of this AD for the prior accomplishment of Revision 30, dated
December 4, 2017.

Request for Minor Editorial Changes

Bombardier requested several minor changes to the NPRM, including
correcting a typographical error in an email address, updating the
address for Bombardier, updating the airplane identity to match the
models and variants as listed on the current type certificate data
sheet (TCDS), and clarifying part numbers and service bulletin numbers.
We agree and have revised this AD accordingly.

Request To Revise Model Callout

Bombardier asked us to change ``604 Variants'' to ``604 Variant''
in the SUMMARY and ``Actions Since AD 2010-14-05 Was Issued'' section
of the NPRM.
We disagree with this request because there are multiple variants
for the CL-600-2B16 airplanes. We have not changed this final rule
regarding this issue.

Comment Regarding TLMC Revision Status

Bombardier noted that the TLMC revisions listed in figure 2 to
paragraph (j) of this AD are the latest versions published on the
customer website and not when the tasks were introduced. No change was
requested or made.

Request To Clarify Applicability

Bombardier requested that we revise the applicability for Model CL-
600-2B16 airplanes in paragraph (c)(5) of the proposed AD by changing
serial numbers ``5701 and subsequent'' to ``5701 through 5988.''
We agree to make this change. We have determined that production
for this model ended with serial number 5988; therefore, there is no
change to the affected airplanes in this AD.

Request To Revise Certain Airplanes Subject to Accumulator Relocation

Bombardier requested that we revise the affected airplanes
identified in paragraph (i)(4) of the proposed AD, from ``S/Ns 5701 and
subsequent'' to ``S/Ns 5701 to 5982.''
We agree with the request. We have determined that accumulators on
airplanes with serial numbers after 5982 have been relocated. We have
revised paragraph (i)(4) of this AD accordingly.

Conclusion

We reviewed the relevant data, considered the comments received,
and determined that air safety and the public interest require adopting
this AD with the changes described previously, and minor editorial
changes. We have determined that these minor changes:
Are consistent with the intent that was proposed in the
NPRM for addressing the unsafe condition; and
Do not add any additional burden upon the public than was
already proposed in the NPRM.
We also determined that these changes will not increase the
economic burden on any operator or increase the scope of this AD.

Related Service Information Under 1 CFR Part 51

The following Bombardier service information describes procedures
for replacing hydraulic system accumulators with new, overhauled, or
refurbished accumulators. These documents are distinct since they apply
to different airplane models.
Service Bulletin 600-0742, Revision 04, dated June 11,
2015.
Service Bulletin 601-0597, Revision 04, dated June 11,
2015.
Service Bulletin 604-29-008, Revision 04, dated June 11,
2015.
Service Bulletin 605-29-001, Revision 04, dated June 10,
2015.
The following Bombardier service information describes procedures
for relocating hydraulic system accumulators. These documents are
distinct since they apply to different airplane models in different
configurations.
Service Bulletin 600-0764, dated October 8, 2015.
Service Bulletin 600-0767, dated August 25, 2016.
Service Bulletin 601-0633, dated October 8, 2015.
Service Bulletin 601-0637, dated August 25, 2016.
Service Bulletin 604-29-013, Revision 02, dated April 18,
2016.
Service Bulletin 605-29-006, Revision 02, dated April 19,
2016.
The following Bombardier Time Limits/Maintenance Checks describe
certain systems life limits of the safe life items. These documents are
distinct since they apply to different airplane models in different
configurations.
Section 5-10-20, Time Limits (Systems), of the Bombardier
Challenger 600 Time Limits/Maintenance Checks, PSP 605, Revision 39,
dated January 8, 2018.

Section 5-10-20, Time Limits (Systems), of the Bombardier
Challenger 601 Time Limits/Maintenance Checks, PSP 601-5, Revision 46,
dated January 8, 2018.
Section 5-10-20, Time Limits (Systems), of the Bombardier
Challenger 601 Time Limits/Maintenance Checks, PSP 601A-5, Revision 42,
dated January 8, 2018.
Section 5-10-11, Life Limits (Systems), of the Bombardier
Challenger CL-604 Time Limits/Maintenance Checks, Part 2, Airworthiness
Limitations, Revision 31, dated November 19, 2018.
Section 5-10-11, Life Limits (Systems), of the Bombardier
Challenger CL-605 Time Limits/Maintenance Checks, Part 2, Airworthiness
Limitations, Revision 20, dated November 19, 2018.
This service information is reasonably available because the
interested parties have access to it through their normal course of
business or by the means identified in the ADDRESSES section.

Costs of Compliance

We estimate that this AD affects 130 airplanes of U.S. registry. We
estimate the following costs to comply with this AD:

Estimated Costs for Required Actions

Labor cost
Parts cost
Cost per product
Cost on U.S. operators
Retained actions: 20 work-hours x $85 per hour = $1,700 $7,717 $9,417 $1,224,210
New actions: Up to 170 work-hours x $85 per hour = Up to $14,450 Up to $41,635 Up to $56,085 Up to $7,291,050

For the new maintenance/inspection program revision, we have
determined that this action takes an average of 90 work-hours per
operator, although we recognize that this number may vary from operator
to operator. In the past, we have estimated that this action takes 1
work-hour per airplane. Since operators incorporate maintenance or
inspection program changes for their affected fleet, we have determined
that a per-operator estimate is more accurate than a per-airplane
estimate. Therefore, we estimate the total cost per operator to be
$7,650 (90 work-hours x $85 per work-hour).
According to the manufacturer, some or all of the costs of this AD
may be covered under warranty, thereby reducing the cost impact on
affected individuals. We do not control warranty coverage for affected
individuals. As a result, we have included all known costs in our cost
estimate.

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.
This AD is issued in accordance with authority delegated by the
Executive Director, Aircraft Certification Service, as authorized by
FAA Order 8000.51C. In accordance with that order, issuance of ADs is
normally a function of the Compliance and Airworthiness Division, but
during this transition period, the Executive Director has delegated the
authority to issue ADs applicable to transport category airplanes and
associated appliances to the Director of the System Oversight Division.

Regulatory Findings

We have determined that this AD will not have federalism
implications under Executive Order 13132. This AD will 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 that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Is not a ``significant rule'' under 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.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.

Adoption of the Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 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)
2010-14-05, Amendment 39-16350 (75 FR 37994, July 1, 2010), and adding
the following new AD: