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PROPOSED AD BOMBARDIER, INC.: Docket No. FAA-2017-0481; Directorate Identifier 2016-NM-196-AD.
(a) COMMENTS DUE DATE

    We must receive comments by July 3, 2017.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This  AD applies  to  Bombardier,  Inc., Model  BD-100-1A10 airplanes,
    certificated  in  any  category, serial  numbers  20003  through 20635
    inclusive.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 24, Electrical power.

(e) REASON

    This AD was prompted by reports of low clearance in the aft  equipment
    bay between auxiliary  power unit (APU)  generator power cables  and a
    hydraulic line,  which can  cause damage  to wire  insulation. We  are
    issuing this AD to prevent electrical arcing from power cables,  which
    could cause a fire in the aft equipment bay.

(f) COMPLIANCE

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

(g) INSPECTION OF APU GENERATOR POWER CABLES AND HYDRAULIC LINE,  REPAIRS,
    AND MODIFICATION

    Within  24  months  after  the  effective  date  of  this  AD,  do the
    applicable actions required by paragraph (g)(1) or (g)(2) of this AD.

(1) For airplanes having serial numbers 20003 through 20500 inclusive:  Do
    a general visual inspection of the APU generator power cables and  the
    adjacent hydraulic line for damage, and do all applicable repairs; and
    modify the APU generator power cable installation; in accordance  with
    the Accomplishment Instructions of Bombardier Service Bulletin  100-24
    -28, dated July 27, 2016, except as required by paragraph (h) of  this
    AD. Do all applicable repairs before further flight.

(2) For airplanes having serial numbers 20501 through 20635 inclusive:  Do
    a general visual inspection of the APU generator power cables and  the
    adjacent hydraulic line for damage, and do all applicable repairs; and
    modify the APU generator power cable installation; in accordance  with
    the Accomplishment Instructions of Bombardier Service Bulletin  350-24
    -003, dated July 27, 2016, except as required by paragraph (h) of this
    AD. Do all applicable repairs before further flight.

(h) EXCEPTION TO THE SERVICE INFORMATION

    Where Bombardier Service Bulletin 100-24-28, dated July 27, 2016,  and
    Bombardier Service Bulletin 350-24-003,  dated July 27, 2016,  specify
    to contact the manufacturer for repair, before further flight,  repair
    using  a   method  approved   by  the   Manager,  New   York  Aircraft
    Certification Office  (ACO), ANE-170,  FAA; or  Transport Canada Civil
    Aviation   (TCCA);  or   Bombardier,  Inc.'s   TCCA  Design   Approval
    Organization (DAO).

(i) OTHER FAA AD PROVISIONS

    The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs):  The Manager, New York 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 manager  of 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 TCCA; or Bombardier, Inc.'s TCCA DAO. If approved  by
    the DAO, the approval must include the DAO-authorized signature.

(j) RELATED INFORMATION

(1) Refer   to   Mandatory  Continuing  Airworthiness  Information  (MCAI)
    Canadian Airworthiness Directive CF-2016-28, dated September 28, 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-2017-0481.

(2) For more information about this AD contact Assata Dessaline, Aerospace
    Engineer, Avionics and Services Branch, ANE-172, FAA New York Aircraft
    Certification Office (ACO),  1600 Stewart Avenue, Suite 410, Westbury,
    NY 11590; telephone 516-228-7301; fax 516-794-5531.

(3) For  service information identified  in this AD,  contact  Bombardier,
    Inc., 400 Cote-Vertu Road West, Dorval, Quobec H4S 1Y9, Canada;  tele-
    phone 514-855-5000;  fax 514-855-7401;  email thd.crj@aero.bombardier.
    com; Internet http://www.bombardier.com. You may view this service in-
    formation 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 12, 2017.  Michael Kaszycki,  Acting
Manager, Transport Airplane Directorate, Aircraft Certification Service.

DATES: We must receive comments on this proposed AD by July 3, 2017.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0481; Directorate Identifier 2016-NM-196-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 BD-100-1A10 airplanes. This proposed AD
was prompted by reports of low clearance in the aft equipment bay
between auxiliary power unit (APU) generator power cables and a
hydraulic line, which can cause damage to wire insulation. This
proposed AD would require an inspection of the APU generator power
cables and the adjacent hydraulic line for damage, and repair, if
necessary; and modification of the APU generator power cable
installation. We are proposing this AD to address the unsafe condition
on these products.

DATES: We must receive comments on this proposed AD by July 3, 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, Quobec
H4S 1Y9, Canada; telephone 514-855-5000; fax 514-855-7401; email
thd.crj@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-2017-0481;
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: Assata Dessaline, Aerospace Engineer,
Avionics and Services Branch, ANE-172, FAA, New York Aircraft
Certification Office (ACO), 1600 Stewart Avenue, Suite 410, Westbury, NY
11590; telephone 516-228-7301; 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-2017-0481;
Directorate Identifier 2016-NM-196-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-
2016-28, dated September 28, 2016 (referred to after this as the
Mandatory Continuing Airworthiness Information, or "the MCAI"), to
correct an unsafe condition for certain Bombardier, Inc., Model BD-100-
1A10 airplanes. The MCAI states:

Low clearance between the APU generator power cables and a
hydraulic return line was found in the Aft Equipment Bay (AEB) on
some aeroplanes in service. Absence of clearance can cause damage to
the insulation of the wire, which can lead to a fault in the APU
electrical system or arcing with the metallic hydraulic return line
and could cause a fire in the AEB.

This [Canadian] AD is issued to mandate an [general visual]
inspection [for damage] of the APU generator power cables and the
hydraulic return line, [and repair, if necessary] and a modification
of the clamp arrangement to give sufficient clearance between the
power cables and the hydraulic return line.

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-2017-0481.

Related Service Information Under 1 CFR Part 51

We reviewed Bombardier Service Bulletin 100-24-28, dated July 27,
2016, and Bombardier Service Bulletin 350-24-003, dated July 27, 2016.
The service information describes procedures for the inspection of the
APU generator power cables and the adjacent hydraulic line for damage,
and repair, if necessary; and modification of the APU generator power
cable installation. These documents are distinct since they apply to
different configurations of this model. 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.

Costs of Compliance

We estimate that this proposed AD affects 162 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
Inspect and modify cables 1 work-hour x $85 per hour = $85
(¹)
$85
$13,770

¹ We have received no definitive data that would enable us to provide cost
estimates for the parts cost associated with the modification specified in
this proposed AD.

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

On-Condition Costs

Action
Labor cost
Parts cost
Cost per product
Repair Up to 5 work-hours x $85 per hour = $425
(¹)
$425

¹ We have received no definitive data that would enable us to provide cost
estimates for the parts cost associated with the repair specified in this
proposed AD.

According to the manufacturer, all of the costs of this proposed 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 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 rule-
making 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):