preamble attached >>>
ADs updated daily at www.Tdata.com
PROPOSED AD BOMBARDIER, INC.: Docket No. FAA-2018-0275; Product Identifier 2018-NM-011-AD.
(a) COMMENTS DUE DATE

    We must receive comments by May 29, 2018.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to Bombardier, Inc., Model airplanes, certificated  in
    any category, identified in  paragraphs (c)(1), (c)(2), and  (c)(3) of
    this AD.

(1) Model  CL-600-2C10  (Regional Jet Series  700, 701, & 702)  airplanes,
    serial numbers 10002 and subsequent.

(2) Model CL-600-2D15 (Regional Jet Series 705) airplanes and Model CL-600
    -2D24 (Regional Jet Series 900) airplanes,  serial  numbers  15001 and
    subsequent.

(3) Model CL-600-2E25 (Regional Jet Series 1000) airplanes, serial numbers
    19001 and subsequent.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 32, Landing gear.

(e) REASON

    This AD was prompted by reports indicating that corrosion was found on
    the main  landing gear  (MLG) retraction  actuator brackets  and their
    associated  pins.  We  are  issuing  this  AD  to  address  undetected
    corrosion on the MLG retraction actuator brackets and their associated
    pins, which could lead to a MLG collapse.

(f) COMPLIANCE

    Comply  with this  AD within  the compliance  times specified,  unless
    already done.

(g) INSPECTION AND REPLACEMENT

    For any MLG dressed shock strut assembly with part numbers and  serial
    numbers  specified  in paragraph  1.A.,  "Effectivity," of  Bombardier
    Service Bulletin 670BA-32-060, Revision B, dated November 10, 2017, at
    the  applicable  compliance  times  specified  in  paragraphs  (g)(1),
    (g)(2), or (g)(3) of this AD,  do a detailed visual inspection of  the
    retraction actuator brackets, their associated pins and hardware,  and
    the mating lugs on  the MLG outer cylinder  for any corrosion, and  do
    all  applicable replacements,  in accordance  with the  Accomplishment
    Instructions of Bombardier Service Bulletin 670BA-32-060, Revision  B,
    dated November 10, 2017. Do all applicable replacements before further
    flight.

(1) For  any  MLG dressed shock strut assembly  that  has accumulated less
    than 10,000 total flight hours on the MLG dressed shock strut assembly
    and  has  been  in service  for less  than 60  months since  its first
    installation on an airplane:  Within  6,600 flight hours or 39 months,
    whichever occurs first, after the effective date of this AD.

(2) For  any  MLG dressed shock strut assembly  that  has accumulated less
    than or equal to  14,000 total flight hours  on the MLG dressed  shock
    strut assembly, and has been in service for less than 84 months  since
    its first installation on an airplane, and does not meet the  criteria
    in  paragraph (g)(1)  of this  AD:  Within  4,400 flight  hours or  26
    months, whichever occurs first, after  the effective date of this  AD,
    but not to exceed 16,600 total  flight hours on the MLG dressed  shock
    strut  assembly  or  99  months since  its  first  installation  on an
    airplane, whichever occurs first.

(3) For  any  MLG dressed shock strut assembly  that  has accumulated more
    than 14,000 total flight hours on the MLG dressed shock strut assembly
    or 84  months or  more since  its first  installation on  an airplane:
    Within 2,600 flight hours or 15 months, whichever occurs first,  after
    the effective date of this AD.

(h) PARTS EXEMPTED FROM THIS AD

    For any MLG dressed shock strut assembly with part numbers and  serial
    numbers  specified  in paragraph  1.A.,  "Effectivity," of  Bombardier
    Service Bulletin  670BA-32-060, Revision B,  dated  November 10, 2017:
    The actions  specified in  paragraph (g)  of this  AD are not required
    provided that the actions in  paragraphs (h)(1), (h)(2), or (h)(3)  of
    this AD have been done.

(1) The actions  in paragraphs (h)(1)(i), (h)(1)(ii), (h)(1)(iii), and (h)
    (1)(iv) of this AD,  as applicable,  have been done on the MLG dressed
    shock strut assembly since its entry-into-service date.

(i) Airplane maintenance manual (AMM) Task 32-32-05-400-803,  Installation
    of the  Outboard MLG  Retraction Actuator  Bracket Pin,  or equivalent
    task in component maintenance manual (CMM) 32-11-05  (for Model CL-600
    -2C10 (Regional Jet Series 700, 701, & 702) airplanes),  or  CMM 32-11
    -06 (for  Model CL-600-2D15  (Regional Jet  Series 705)  airplanes and
    Model CL-600-2D24 (Regional Jet  Series 900) airplanes), or  CMM 32-11
    -34 (for Model CL-600-2E25 (Regional Jet Series 1000) airplanes); and

(ii) AMM Task 32-32-05-400-804, Installation of the Inboard MLG Retraction
     -Actuator Bracket Pin, or equivalent task in CMM 32-11-05 (for  Model
     CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes), or  CMM
     32-11-06 (for Model CL-600-2D15  (Regional Jet Series 705)  airplanes
     and Model CL-600-2D24  (Regional Jet Series  900) airplanes), or  CMM
     32-11-34   (for  Model   CL-600-2E25  (Regional   Jet  Series   1000)
     airplanes); and

(iii) AMM Task 32-32-05-400-805 Installation of the Inboard-MLG Retraction
      -Actuator Pin, or AMM Task 32-32-05-400-801, Installation of the MLG
      Retraction-Actuator, or AMM  Task 32-11-05-400-801, Installation  of
      the MLG Shock-Strut Assembly; and

(iv) For Model CL-600-2C10 (Regional Jet Series 700, 701 & 702) airplanes,
     Model CL-600-2D15 (Regional Jet Series 705) airplanes,  and  Model CL
     -600-2D24  (Regional  Jet  Series 900)  airplanes  equipped  with MLG
     auxiliary actuators: AMM  Task 32-32-03-400-801, Installation  of the
     MLG Auxiliary Actuator, or AMM Task 32-11-05-400-801, Installation of
     the MLG Shock-Strut Assembly.

(2) AMM Task 32-32-05-400-806, Installation of the MLG Retraction-Actuator
    Bracket has been accomplished on the MLG dressed shock strut  assembly
    since its entry-into-service date.

(3) AMM-Tasks 32-11-00-610-801 Restoration  (Overhaul) of the MLG Assembly
    has been accomplished since its entry into service date.

(i) CREDIT FOR PREVIOUS ACTIONS

    This paragraph provides credit  for actions required by  paragraph (g)
    of this AD, if those actions were performed before the effective  date
    of this AD using  Bombardier Service Bulletin 670BA-32-060,  dated May
    2,  2017,  or  Bombardier Service  Bulletin 670BA-32-060,  Revision A,
    dated June 22, 2017.

(j) OTHER FAA AD PROVISIONS

    The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs):  The Manager,  New York ACO
    Branch,  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 certification office,  send
    it to ATTN: Program  Manager, Continuing Operational Safety,  FAA, New
    York ACO Branch, 1600 Stewart  Avenue, Suite 410, Westbury, NY  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.

(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
    Inc.'s TCCA  Design Approval  Organization (DAO).  If approved  by the
    DAO, the approval must include the DAO-authorized signature.

(k) RELATED INFORMATION

(1) Refer   to   Mandatory  Continuing  Airworthiness  Information  (MCAI)
    Canadian Airworthiness Directive CF-2017-34,  dated  October 19, 2017,
    for  related  information.  This MCAI may be found in the AD docket on
    the internet at http://www.regulations.gov by searching for and locat-
    ing Docket No. FAA-2018-0275.

(2) For more information about this AD,  contact  Dorie Resnik,  Aerospace
    Engineer,  Aviation Safety Section  AIR-7B1,  Boston ACO Branch,  FAA,
    1200 District Avenue, Burlington, MA 01803; telephone 781-238-7693.

(3) For information about AMOCs,  contact Aziz Ahmed,  Aerospace Engineer,
    Airframe and Mechanical Systems Section,  FAA,  New York  ACO  Branch,
    1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-
    7329; fax 516-794-5531.

(4) For  service information identified  in this AD,  contact  Bombardier,
    Inc., 400 Cote-Vertu Road West, Dorval, Quebec H4S 1Y9, Canada;  Wide-
    body Customer Response Center North America toll-free telephone 1-866-
    538-1247 or direct-dial telephone 1-514-855-2999; fax 514-855-7401; e-
    mail 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.

Issued  in  Des Moines, Washington,  on March 29, 2018. Chris Spangenberg,
Acting Director, System Oversight Division, Aircraft Certification Service

DATES: We must receive comments on this proposed AD by May 29, 2018.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2018-0275; Product Identifier 2018-NM-011-AD]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: We propose to adopt a new airworthiness directive (AD) for
certain Bombardier, Inc., Model CL-600-2C10 (Regional Jet Series 700,
701, & 702) airplanes; Model CL-600-2D15 (Regional Jet Series 705)
airplanes; Model CL-600-2D24 (Regional Jet Series 900) airplanes; and
Model CL-600-2E25 (Regional Jet Series 1000) airplanes. This proposed
AD was prompted by reports indicating that corrosion was found on the
main landing gear (MLG) retraction actuator brackets and their
associated pins. This proposed AD would require an inspection of the
retraction actuator brackets, their associated pins and hardware, and
the mating lugs on the MLG outer cylinder for any corrosion, and
replacement if necessary. We are proposing this AD to address the
unsafe condition on these products.

DATES: We must receive comments on this proposed AD by May 29, 2018.

ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, 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: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.

For service information identified in this NPRM, contact
Bombardier, Inc., 400 Cote-Vertu Road West, Dorval, Quebec
H4S 1Y9, Canada; Widebody Customer Response Center North America toll-
free telephone 1-866-538-1247 or direct-dial telephone 1-514-855-2999;
fax 514-855-7401; 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.

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-
0275; or in person at the Docket Management Facility between 9 a.m. and
5 p.m., Monday through Friday, except Federal holidays. The AD docket
contains this NPRM, 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: Dorie Resnik, Aerospace Engineer,
Aviation Safety Section AIR-7B1, Boston ACO Branch, FAA, 1200 District
Avenue, Burlington, MA 01803; telephone 781-238-7693.

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-2018-0275;
Product Identifier 2018-NM-011-AD" at the beginning of your comments.
We specifically invite comments on the overall regulatory, economic,
environmental, and energy aspects of this NPRM. We will consider all
comments received by the closing date and may amend this NPRM 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 NPRM.

Discussion

Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian Airworthiness Directive CF-
2017-34, dated October 19, 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-
2C10 (Regional Jet Series 700, 701, & 702) airplanes; Model CL-600-2D15
(Regional Jet Series 705) airplanes; Model CL-600-2D24 (Regional Jet
Series 900) airplanes; and Model CL-600-2E25 (Regional Jet Series 1000)
airplanes. The MCAI states:

There have been in-service reports of corrosion on the main
landing gear (MLG) retraction actuator bracket and its associated
pins. Bombardier's investigation determined that the corrosion is
the consequence of inadequate corrosion protection being applied
during production. Undetected corrosion on the MLG retraction
actuator bracket and its associated pins could result in a MLG
collapse.

This [Canadian] AD mandates the inspection of the MLG retraction
actuator bracket, its associated pins and hardware, and the mating
lugs on the MLG outer cylinder for corrosion. This [Canadian] AD
also mandates the replacement of corroded MLG parts and the
application of corrosion protection in order to mitigate the risk of
MLG collapse.

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-2018-0275.

Related Service Information Under 1 CFR Part 51

Bombardier has issued Service Bulletin 670BA-32-060, Revision B,
dated November 10, 2017. The service information describes a detailed
visual inspection of the retraction actuator brackets, their associated
pins and hardware, and the mating lugs on the MLG outer cylinder for
any corrosion, and replacement if necessary. 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.

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 these
same type designs.

Costs of Compliance

We estimate that this proposed AD affects 541 airplanes of U.S.
registry.

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

Estimated Costs

Action Labor cost Parts cost Cost per product Cost on U.S. operators
Inspection 16 work-hours x $85 per hour = $1,360 $0 $1,360 $735,760

We estimate the following costs to do any necessary replacements
that would be required based on the results of the proposed inspection.
We have no way of determining the number of aircraft that might need
these replacements:

On-Condition Costs

Action Labor cost Parts cost Cost per product
Replacement 1 work-hour x $85 per hour = $85 Up to $75,790 Up to $75,875

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 proposed 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 to the Director of the System Oversight
Division.

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.

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 airworthiness
directive (AD):