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PROPOSED AD BOMBARDIER, INC.: Docket No. FAA-2017-0511; Directorate Identifier 2016-NM-176-AD.
(a) COMMENTS DUE DATE

    We must receive comments by July 24, 2017.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This  AD  applies  to the  airplanes  specified  in paragraphs  (c)(1)
    through (c)(3) of this AD, certificated in any category.

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

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

(3) Bombardier, Inc.  Model  CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604
    Variants)  airplanes,  serial  numbers  5001  through  5194 inclusive;
    serial numbers 5301  through 5665 inclusive,  and serial numbers  5701
    through 5851 inclusive.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 57, Wings.

(e) REASON

    This AD was prompted by a new life limitation that has been introduced
    for  the  side brace fitting shaft and  side brace-to-airplane fitting
    pin of the main landing gear (MLG).  We are issuing this AD to prevent
    the loss of structural integrity of the affected part.

(f) COMPLIANCE

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

(g) REVISION OF MAINTENANCE OR INSPECTION PROGRAM

    Within 30 days after the effective date of this AD, revise the mainte-
    nance or inspection program, as applicable,  by incorporating the life
    limits  for  the side brace fitting shaft  and  side brace-to-airplane
    fitting pin of the MLG, as applicable,  identified in table 1 to para-
    graph (g) of this AD.  The initial compliance time  for  accomplishing
    the replacement is at the applicable time  in  the Time Limits/Mainte-
    nance Checks (TLMC) Manual revisions specified in table 1 to paragraph
    (g) of this AD, or within 30 days after the effective date of this AD,
    whichever occurs later.

        TABLE 1 TO PARAGRAPH (G) OF THIS AD - LIFE LIMITS FOR THE AFFECTED PARTS        
    ____________________________________________________________________________________
    AIRPLANE
    MODEL
    (SERIAL                                    TLMC                 REVISION   REVISION
    NOS. (S/NS))   PART NAME     PART NO.    MANUAL NO.   CHAPTER      NO.       DATE
    ____________________________________________________________________________________
    CL-600-1A11    MLG Side      600-10237    PSP 605     5-10-10      37      April 29,
    (S/Ns 1004     Brace-to-     -1/-5                                         2016
    through 1085   Airplane
    inclusive)     Fitting Pin

    CL-600-2A12    MLG Side      600-10237    PSP 601-5   5-10-10      42      April 22,
    (S/N 3001-     Brace-to-     -3                                            2014
    3066           Airplane
    inclusive)     Fitting Pin

    CL-600-2B16    MLG Side      600-10237    PSP 601A-5  5-10-10      38      April 22,
    (S/Ns 5001-    Brace-to-     -3                                            2014
    5194           Airplane
    inclusive)     Fitting Pin

    CL-600-2B16    MLG Side      601R10237    CL-604      5-10-10      26      June 9,
    (S/Ns 5301-    Brace         -1/-3                    (Part 2)             2016
    5665           Fitting
    inclusive)     Shaft

    CL-600-2B16    MLG Side      601R10237    CL-605      5-10-10      14      June 9,
    (S/Ns 5701-    Brace         -1/-3                    (Part 2)             2016
    5851           Fitting
    inclusive)     Shaft
    ____________________________________________________________________________________

(h) INSPECTION, SERIALIZATION, AND RECORDING OF LIFE LIMITED PARTS

    Within  48 months  after the  effective date  of this  AD: Inspect  to
    identify the serial number, serialize, and record the accumulated life
    of  the  side  brace  fitting shaft  of  the  MLG,  as applicable,  in
    accordance  with  the Accomplishment  Instructions  of the  applicable
    service information in paragraphs (h)(1) through (h)(4) of this AD.

(1) For   CL-600-1A11  airplanes   (S/Ns  1004  through  1085  inclusive):
    Bombardier Service Bulletin 600-0768, dated September 9, 2014.

(2) For  CL-600-2A12  (S/Ns 3001 through 3066 inclusive)  and  CL-600-2B16
    airplanes  (S/Ns  5001  through  5194  inclusive):  Bombardier Service
    Bulletin 601-0636, Revision 01, dated May 10, 2016.

(3) For   CL-600-2B16  aeroplanes  (S/Ns  5301  through  5665  inclusive):
    Bombardier Service Bulletin 604-57-005, dated September 9, 2014.

(4) For   CL-600-2B16  aeroplanes  (S/Ns  5701  through  5851  inclusive):
    Bombardier Service Bulletin 605-57-003, dated September 9, 2014.

(i) NO REPORTING REQUIREMENT

    Although  the  service  information  identified  in  paragraphs (h)(1)
    through (h)(4) of this AD  specifies to submit certain information  to
    the manufacturer, this AD does not include that requirement.

(j) NO ALTERNATIVE ACTIONS AND INTERVALS

    After  the  maintenance or  inspection  program has  been  revised, as
    applicable, as required  by paragraph (g)  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 (k)(1) of this AD.

(k) OTHER FAA AD PROVISIONS

    The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs):  The Manager, New York Air-
    craft Certification Office, ANE-170, FAA, has the authority to approve
    AMOCs for this AD, if requested  using the procedures found in 14  CFR
    39.19. In  accordance with  14 CFR  39.19, send  your request  to your
    principal  inspector  or  local Flight  Standards District  Office, as
    appropriate. If sending  information directly to  the ACO, send  it to
    ATTN: Program  Manager, Continuing  Operational Safety,  FAA, New York
    ACO, 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,
    ANE-170,  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.

(l) RELATED INFORMATION

(1) Refer   to   Mandatory  Continuing  Airworthiness  Information  (MCAI)
    Canadian Airworthiness  Directive CF-2016-17R2,  dated  June 29, 2016,
    for related information. 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-2017-0511.

(2) For  more information  about this AD,  contact  Aziz Ahmed,  Aerospace
    Engineer,  Airframe and Mechanical Systems Branch,  ANE-171,  FAA, New
    York ACO, 1600 Stewart Ave., Suite 410, Westbury, NY 11590;  telephone
    516-228-7329; fax 516-794-5531.

(3) 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  Airplane
    Directorate, 1601 Lind Avenue SW., Renton, WA.  For information on the
    availability of this material at the FAA, call 425-227-1221.

Issued in Renton,  Washington, on May 18, 2017.  Michael Kaszycki,  Acting
Manager, Transport Airplane Directorate, Aircraft Certification Service.

DATES: We must receive comments on this proposed AD by July 24, 2017.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0511; Directorate Identifier 2016-NM-176-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-600-1A11 (CL-600), CL-600-2A12 (CL-
601 Variant), and CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604
Variants) airplanes. This proposed AD was prompted by a new life
limitation that has been introduced for the side brace fitting shaft
and side brace-to-airplane fitting pin of the main landing gear (MLG).
This proposed AD would require revising the maintenance or inspection
program. This proposed AD would also require an inspection to identify
the serial number, to serialize, and to record the accumulated life of
the side brace fitting shaft of the MLG. We are proposing this AD to
address the unsafe condition on these products.

DATES: We must receive comments on this proposed AD by July 24, 2017.

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
referenced service information at the FAA, Transport Airplane Directorate,
1601 Lind Avenue SW., Renton, WA. 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 by searching for and locating Docket No. FAA-2017-0511;
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 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: Aziz Ahmed, Aerospace Engineer,
Airframe and Mechanical Systems Branch, ANE-171, FAA, New York Aircraft
Certification Office (ACO), 1600 Stewart Avenue, Suite 410, Westbury,
NY 11590; telephone 516-228-7329; 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-2017-0511;
Directorate Identifier 2016-NM-176-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

Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian Airworthiness Directive CF-
2016-17R2, dated June 29, 2016 (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 (CL-
600), CL-600-2A12 (CL-601 Variant), and CL-600-2B16 (CL-601-3A, CL-601-
3R, and CL-604 Variants) airplanes. The MCAI states:

Based on in-service experience, a new life limitation has been
introduced for the following side brace fitting shaft part numbers:

600-10237-1/-5
600-10237-3
601R10237-1/-3

In order to facilitate identification and tracking, the component must
be identified and serialized. Bombardier has revised the Time Limits/
Maintenance Checks (TLMC) Manual to include new life limits and issued
Service Bulletins (SB) for serialization of the affected parts.

The original version of this [Canadian] AD was issued to mandate
the incorporation of the new TLMC life limits as well as
identification and serialization of the affected parts. The revision
1 of this [Canadian] AD was issued * * * June [10,] 2016 to correct
a typographic error in Table A of the Corrective Actions section.
The revision 2 of this [Canadian] AD is being issued to correct/
update the TLMC data in Table A of the Corrective Actions section.

Required actions include an inspection to identify the serial
number, to serialize, and to record the accumulated life of the side
brace fitting shaft of the MLG. The unsafe condition is the loss of
structural integrity of the affected part. 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-2017-0511.

Related Service Information Under 1 CFR Part 51

We reviewed the following service information. The service information
describes the life limits for the side brace fitting shaft and side
brace-to-airplane fitting pin of the MLG. The service information is
distinct since it applies to different airplane models in different
configurations.

Chapter 5-10-10, Airworthiness Limitations, of the Bombardier Challenger
PSP 605 Time Limits/Maintenance Checks, Revision 37, dated April 29, 2016.

Chapter 5-10-10, Airworthiness Limitations, of the Bombardier Challenger
PSP 601-5 Time Limits/Maintenance Checks, Revision 42, dated April 22,
2014.

Chapter 5-10-10, Airworthiness Limitations, of the Bombardier Challenger
PSP 601A-5 Time Limits/Maintenance Checks, Revision 38, dated April 22,
2014.

Chapter 5-10-10, Airworthiness Limitations, of Part 2, of the Bombardier
Challenger CL-604 Time Limits/Maintenance Checks, Revision 26, dated
June 9, 2016.

Chapter 5-10-10, Airworthiness Limitations, of Part 2, of the Bombardier
Challenger CL-605 Time Limits/Maintenance Checks, Revision 14, dated June
9, 2016.

We have also reviewed the following service information. The service
information describes procedures for an inspection to identify the serial
number, to serialize, and to record the accumulated life of the side brace
fitting shaft of the MLG. The service bulletins are distinct since they
apply to different airplane models.

Bombardier Service Bulletin 600-0768, dated September 9, 2014.

Bombardier Service Bulletin 601-0636, Revision 01, dated May 10, 2016.

Bombardier Service Bulletin 604-57-005, dated September 9, 2014.

Bombardier Service Bulletin 605-57-003, dated September 9, 2014.

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 the same
type design.

This proposed AD would require revisions to certain operator
maintenance documents to include new actions (e.g., inspections).
Compliance with these actions is required by 14 CFR 91.403(c). For
airplanes that have been previously modified, altered, or repaired in
the areas addressed by this proposed AD, the operator may not be able
to accomplish the actions described in the revisions. In this
situation, to comply with 14 CFR 91.403(c), the operator must request
approval for an alternative method of compliance according to paragraph
(k)(1) of this proposed AD. The request should include a description of
changes to the required actions that will ensure the continued
operational safety of the airplane.

Costs of Compliance

We estimate that this proposed AD affects 133 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
Maintenance or inspection program revision 1 work-hour x $85 per hour = $85
$0
$85
$11,305
Inspection, identification, serialization, and recording 1 work-hour x $85 per hour = $85
33
118
15,694

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.

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):