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2018-14-05 BOMBARDIER, INC.: Amendment 39-19325; Docket No. FAA-2018-0274; Product Identifier 2017-NM-128-AD.
(a) EFFECTIVE DATE

    This AD is effective August 13, 2018.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This  AD  applies  to Bombardier,  Inc., Model  BD-100-1A10 airplanes,
    certificated  in any  category,  serial  numbers (S/Ns)  20003 through
    20500 inclusive and 20501 through 20696 inclusive.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 49, Airborne auxiliary
    power.

(e) REASON

    This AD  was prompted  by reports  of fire  incidents of the auxiliary
    power unit (APU) inlet, which caused tail cone damage after an initial
    failed APU start followed by two or more in-flight APU start attempts.
    We are  issuing this  AD to  prevent failure  of the  APU inlet, which
    could result in a fire during flight.

(f) COMPLIANCE

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

(g) MODIFICATION

    Within 30 months after the effective  date of this AD: Modify the  APU
    electronic control unit (ECU)  wiring harness, in accordance  with the
    Accomplishment Instructions of Bombardier Service Bulletin  100-49-04,
    dated  March 29, 2017 (for  S/N 20003  through  20500  inclusive);  or
    Bombardier Service Bulletin 350-49-001, dated March 29, 2017 (for  S/N
    20501 through 20696 inclusive).

(h) 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.

(i) RELATED INFORMATION

(1) Refer   to   Mandatory  Continuing  Airworthiness  Information  (MCAI)
    Canadian Airworthiness Directive CF-2017-26,  dated July 31, 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 locating
    Docket No. FAA-2018-0274.

(2) For more information about this AD contact Assata Dessaline, Aerospace
    Engineer,  Avionics and Administrative Services Section,  New York ACO
    Branch, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; tele-
    phone 516-228-7301; fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov.

(j) 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 this AD specifies otherwise.

(i) Bombardier Service Bulletin 100-49-04, dated March 29, 2017.

(ii) Bombardier Service Bulletin 350-49-001, dated March 29, 2017.

(3) For Bombardier, Inc service information identified in this AD, contact
    Bombardier, Inc.,  400 Cote-Vertu Road West,  Dorval,  Quebec H4S 1Y9,
    Canada; telephone 514-855-5000; fax 514-855-7401;  email thd.crj@aero.
    bombardier.com; internet http://www.bombardier.com.

(4) 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.

(5) 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  June 26, 2018.  Jeffrey E. Duven,
Director, System Oversight Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT:  Assata  Dessaline,  Aerospace  Engineer,
Avionics and Administrative Services Section,  FAA,  New York  ACO Branch,
1600 Stewart Avenue, Suite 410 Westbury, NY 11590; telephone 516-228-7301;
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-2018-0274; Product Identifier 2017-NM-128-AD; Amendment
39-19325; AD 2018-14-05]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).

ACTION: Final rule.

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

SUMMARY: We are adopting a new airworthiness directive (AD) for certain
Bombardier, Inc., Model BD-100-1A10 airplanes. This AD was prompted by
reports of fire incidents of the auxiliary power unit (APU) inlet,
which caused tail cone damage after an initial failed APU start
followed by two or more in-flight APU start attempts. This AD requires
modification of the APU electronic control unit (ECU) wiring harness.
We are issuing this AD to address the unsafe condition on these
products.

DATES: This AD is effective August 13, 2018.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of August 13,
2018.

ADDRESSES: For service information identified in this final rule,
contact Bombardier, Inc., 400 Cote-Vertu Road West, Dorval,
Quebec 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 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-2018-0274.

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-
0274; 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 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 Administrative Services Section, FAA, New York ACO Branch,
1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-
7301; 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 by adding an AD that would apply to certain Bombardier, Inc.,
Model BD-100-1A10 airplanes. The NPRM published in the Federal Register
on April 13, 2018 (83 FR 16013). The NPRM was prompted by reports of
fire incidents of the APU inlet, which caused tail cone damage after an
initial failed APU start followed by two or more in-flight APU start
attempts. The NPRM proposed to require modification of the APU ECU
wiring harness.
We are issuing this AD to address failure of the APU inlet, which
could result in a fire during flight.
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian Airworthiness Directive CF-
2017-26, dated July 31, 2017, (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:

APU inlet fire incidents causing tail cone damage have been
reported after an initial failed APU start followed by two or more
in-flight APU start attempts. Bombardier, Inc. (BA) has determined
that the in-flight negative pressure differential at the APU inlet
allows flash fires of residual fuel in the APU combustor to exit
through the APU inlet.
As an interim mitigating action, BA has revised the affected
aeroplane Aircraft Flight Manual (AFM) procedure for in-flight APU
start to limit the number of APU start attempts.
To further address the safety concerns associated with in-flight
APU inlet fire, BA is introducing a modification to the APU
Electronic Control Unit (ECU) wiring harness that will prevent a
second attempt to start the APU following a failed start in flight.
This [Canadian] AD is issued to mandate compliance with BA Service
Bulletin (SB) 100-49-04 or SB 350-49-001, as applicable, on affected
aeroplanes.

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-2018-0274.

Comments

We gave the public the opportunity to participate in developing
this final rule. We received no comments on the NPRM or on the
determination of the cost to the public.

Conclusion

We reviewed the relevant data and determined that air safety and
the public interest require adopting this final rule as proposed,
except for 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.

Related Service Information Under 1 CFR Part 51

Bombardier has issued Service Bulletin 100-49-04, dated March 29,
2017; and Service Bulletin 350-49-001, dated March 29, 2017. This
service information describes a modification of the APU ECU harness.
These documents are distinct since they apply to different airplane
models in different configurations. 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 198 airplanes of U.S. registry.
We estimate the following costs to comply with this AD:

Estimated Costs

Action Labor cost Parts cost Cost per product Cost on U.S. operators
Modification 3 work-hours x $85 per hour = $255 $120 $375 $74,250

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

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 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.

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 adding the following new airworthiness
directive (AD):