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2020-02-10 DE HAVILLAND AIRCRAFT OF CANADA LIMITED (TYPE CERTIFICATE PREVIOUSLY HELD BY BOMBARDIER, INC.):
Amendment 39-19825; Docket No. FAA-2019-0702; Product Identifier 2019-NM-118-AD.

(a) EFFECTIVE DATE

    This AD is effective March 12, 2020.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This  AD  applies  to  De Havilland  Aircraft of Canada Limited  (Type
    Certificate Previously Held by Bombardier, Inc.) Model DHC-8-400, -401
    and -402 airplanes, certificated in any category,  serial numbers 4001
    and 4003 and subsequent.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 26, Fire protection.

(e) REASON

    This AD was prompted  by a report of a quality escape  in the manufac-
    turing of advanced pneumatic detector (APD) switches,  which consisted
    of the presence of contamination on the switch contact pin. The FAA is
    issuing this AD to address such contamination  that could insulate the
    contact pin  from the diaphragm  and  result in an undetected fire  or
    late detection of a fire.

(f) COMPLIANCE

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

(g) AFFECTED APDS

    For  purposes  of  this  AD,  an affected APD is manufactured by Kidde
    Aerospace and Defense  (part of  United Technologies Aerospace Systems
    (UTAS))  and  has a part number and serial number identified  in para-
    graphs (g)(1) through (10) of this AD.

(1) Part number 10-1096 (all serial numbers).

(2) Part number 10-1096-01 (all serial numbers).

(3) Part number 10-1096-02 (serial numbers before AEM9907).

(4) Part number 10-1097 (all serial numbers).

(5) Part number 10-1097-01 (all serial numbers).

(6) Part number 10-1097-02 (serial numbers before 17-0005).

(7) Part number 10-1098 (all serial numbers).

(8) Part number 10-1098-01 (serial numbers before 17-0110).

(9) Part number 10-1099 (all serial numbers).

(10) Part number 10-1099-01 (serial numbers before 17-0009).

(h) APD IDENTIFICATION AND TEST

    Within 8,000 flight hours or 48 months,  whichever  occurs first after
    the effective date of this AD:  Do the applicable actions specified in
    paragraph (h)(1) and (2) of this AD, in accordance with paragraph 3.B.
    "Procedure,"  of the Accomplishment Instructions of Bombardier Service
    Bulletin 84-26-19, Revision `A,' dated February 11, 2019.

(1) Determine whether any affected APD is installed on the engine nacelles
    or auxiliary power unit (APU) compartment.

(2) Do the on-aircraft test of all affected APDs.

(i) For any APD that passes the test:  Before  further  flight, reidentify
    the APD.

(ii) For any APD that fails the test:  Before further flight,  replace the
     APD with an unaffected APD,  or  one provided  by Kidde Aerospace and
     Defense that has been successfully tested and reidentified.

(i) RETURNING AND REPORTING FAILED APDS

    For any APD that fails the test specified  in paragraph (h)(2) of this
    AD: Return the APD  at the applicable time specified  in paragraph (i)
    (1) or (2) of this AD to Kidde Aerospace & Defense, 4200 Airport Dr NW
    Building B, Wilson, NC 27896-8630,  Attention Keith Fail,  Supervisor,
    Service Center.

(1) If the test was done on  or after the effective date of this AD:  Send
    the APD within 30 days after completion of the test.

(2) If the test was done  before the effective date of this AD:  Send  the
    APD within 30 days after the effective date of this AD.

(j) PARTS INSTALLATION LIMITATION

    As of the effective date of this AD, no person may install an affected
    APD,  unless the APD has been successfully tested  and reidentified in
    accordance with Bombardier Service Bulletin 84-26-19 dated October 24,
    2018; or Revision `A,' dated February 11, 2019.

(k) CREDIT FOR PREVIOUS ACTIONS

    This paragraph provides credit  for actions required  by paragraph (h)
    of this AD,  if those actions were performed before the effective date
    of this AD using Bombardier Service Bulletin 84-26-19,  dated  October
    24, 2018.

(l) 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  De
    Havilland   Aircraft  of   Canada  Limited's   TCCA  Design   Approval
    Organization (DAO). If approved by the DAO, the approval must  include
    the DAO-authorized signature.

(3) Reporting  Requirements:  A federal agency may not conduct or sponsor,
    and a  person is  not required  to respond  to, nor  shall a person be
    subject  to  a  penalty for  failure to  comply with  a collection  of
    information subject to the requirements of the Paperwork Reduction Act
    unless that  collection of  information displays  a current  valid OMB
    Control Number. The OMB Control Number for this information collection
    is 2120-0056. Public reporting  for this collection of  information is
    estimated to be approximately 1 hour per response, including the  time
    for reviewing instructions, completing and reviewing the collection of
    information.  All  responses  to this  collection  of  information are
    mandatory  as  required  by  this   AD;  the  nature  and  extent   of
    confidentiality to be provided,  if any. Send comments  regarding this
    burden estimate or any other aspect of this collection of information,
    including  suggestions  for   reducing  this  burden   to  Information
    Collection Clearance Officer,  Federal Aviation Administration,  10101
    Hillwood Parkway, Fort Worth, TX 76177-1524.

(m) RELATED INFORMATION

(1) Refer   to   Mandatory  Continuing  Airworthiness  Information  (MCAI)
    Canadian Airworthiness Directive CF-2019-13,  dated April 4, 2019, for
    related information.  This MCAI may be found  in the AD docket  on the
    internet at https://www.regulations.gov by searching for  and locating
    Docket No. FAA-2019-0702.

(2) For more information about this AD,  contact Thomas Niczky,  Aerospace
    Engineer,  Avionics and Electrical Systems Section,  FAA, New York ACO
    Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;  telephone
    516-228-7347; 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 (n)(3)
    and (4) of this AD.

(n) 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 84-26-19, Revision `A,' dated February 11,
    2019.

(ii) [Reserved]

(3) For service information identified  in this AD,  contact  De Havilland
    Aircraft of Canada Limited,  Q-Series Technical Help Desk, 123 Garratt
    Boulevard, Toronto,  Ontario M3K 1Y5, Canada;  telephone 416-375-4000;
    fax   416-375-4539;   email  thd@dehavilland.com;   internet  https://
    dehavilland.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,  email
    fedreg.legal@nara.gov,   or  go  to  https://www.archives.gov/federal-
    register/cfr/ibr-locations.html.

Issued  on  January 16, 2020.  Michael Kaszycki,  Acting Director,  System
Oversight Division, Aircraft Certification Service.

FOR  FURTHER  INFORMATION  CONTACT:  Thomas  Niczky,  Aerospace  Engineer,
Avionics and Electrical Systems Section,  FAA,  New York ACO Branch,  1600
Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7347; 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-2019-0702; Product Identifier 2019-NM-118-AD; Amendment
39-19825; AD 2020-02-10]
RIN 2120-AA64

Airworthiness Directives; De Havilland Aircraft of Canada Limited
(Type Certificate Previously Held by Bombardier, Inc.) Airplanes

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

ACTION: Final rule.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain De Havilland Aircraft of Canada Limited Model DHC-8-400 series
airplanes. This AD was prompted by a report of a quality escape in the
manufacturing of advanced pneumatic detector (APD) switches, which
consisted of the presence of contamination on the switch contact pin.
This AD requires identification and testing, and reidentification or
replacement if necessary, of affected APDs. The FAA is issuing this AD
to address the unsafe condition on these products.

DATES: This AD is effective March 12, 2020.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of March 12,
2020.

ADDRESSES: For service information identified in this final rule,
contact De Havilland Aircraft of Canada Limited, Q-Series Technical
Help Desk, 123 Garratt Boulevard, Toronto, Ontario M3K 1Y5, Canada;
telephone 416-375-4000; fax 416-375-4539; email thd@dehavilland.com;
internet https://dehavilland.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 https://
www.regulations.gov by searching for and locating Docket No. FAA-2019-
0702.

Examining the AD Docket

You may examine the AD docket on the internet at https://www.regulations.
gov by searching for and locating Docket No. FAA-2019-0702;
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 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: Thomas Niczky, Aerospace Engineer,
Avionics and Electrical Systems Section, FAA, New York ACO Branch, 1600
Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7347;
fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov.

SUPPLEMENTARY INFORMATION:

Discussion

Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian AD CF-2019-13, dated April 4,
2019 (``Canadian AD CF-2019-13'') (also referred to as the Mandatory
Continuing Airworthiness Information, or ``the MCAI''), to correct an
unsafe condition for certain De Havilland Aircraft of Canada Limited
Model DHC-8-400, -401, and -402 airplanes. You may examine the MCAI in
the AD docket on the internet at https://www.regulations.gov by
searching for and locating Docket No. FAA-2019-0702.
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to certain De Havilland
Aircraft of Canada Limited Model DHC-8-400 series airplanes. The NPRM
was published in the Federal Register on October 4, 2019 (84 FR 53070).
The NPRM was prompted by a report of a quality escape in the
manufacturing of APD switches, which consisted of the presence of
contamination on the switch contact pin. The NPRM proposed to require
identification and testing, and reidentification or replacement if
necessary, of affected APDs. The FAA is issuing this AD to address such
contamination that could insulate the contact pin from the diaphragm
and result in an undetected fire or late detection of a fire. See the
MCAI for additional background information.

Comments

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

Request To Update Type Certificate (TC) Holder

Bombardier Aviation reported that ownership of the affected
airplanes was transferred to De Havilland Aircraft of Canada Limited.
Bombardier requested that the FAA revise the NPRM to identify De
Havilland as the U.S. TC holder.
The FAA acknowledges the change of ownership identified by the
commenter and has revised this final rule accordingly. The FAA also
notes that any future revisions to the referenced service information,
Bombardier Service Bulletin 84-26-19, Revision `A,' dated February 11,
2019, will be issued by De Havilland Aircraft of Canada Limited.

Request To Limit Required Actions

Horizon Air requested that the FAA revise the proposed AD to limit
the required actions to those specified in paragraph 3.B.,
``Procedure,'' of Bombardier Service Bulletin 84-26-19, Revision `A,'
dated February 11, 2019. Horizon noted that the proposed AD would
require ``the Accomplishment Instructions'' of the service information,
which also includes paragraph 3.A., ``Job Set-Up,'' and paragraph 3.C.,
``Close Out.'' Horizon Air stated that those sections do not directly
correct the unsafe condition.
The FAA agrees with the commenter's request and has revised
paragraph (h) of this AD accordingly.

Request To Remove Requirement To Return Failed APDs

Horizon Air requested that the FAA remove paragraph (i) of the
proposed AD (``Return of Failed APDs''). Horizon Air alleged that this
requirement would place an unnecessary cost and regulatory burden on
operators who must create, track, and maintain records to demonstrate
compliance with the required return criteria. Horizon Air added that
return of any failed loop (APD) could be done via operators' field
service/product support network with Kidde Aerospace and Defense (part
of United Technologies Aerospace Systems (UTAS)). Horizon further
asserted that the FAA did not justify the proposed requirement to return failed
APDs to Kidde Aerospace and Defense or explain how this would improve the
level of safety.
The FAA does not agree that the requirement to return failed APDs
to Kidde Aerospace and Defense places an unnecessary cost and
regulatory burden on operators. Bombardier Service Bulletin 84-26-19,
Revision `A,' dated February 11, 2019, refers to Kidde Aerospace and
Defense Service Bulletin 10-1096-26-511, Paragraph 3.3.F, which
specifies returning the part with a Return Authorization form to Kidde
Aerospace and Defense so that operators can receive a free-of-charge
replacement. The cost of an APD varies from $6,300 to $9,300, depending
on the type. With seven APDs on the aircraft, it is actually a cost
benefit to return failed APDs to obtain replacements free of charge. In
addition, when an unsafe condition involves an escape in a
manufacturer's quality control (QC) system, returning failed parts or
reporting certain findings can be instrumental in determining the
extent and nature of the QC problem, especially in cases where the data
may not be available through other established means. The information
collected from the return of the failed APDs is necessary to ensure
that proper corrective action will be taken. The FAA has not changed
this AD regarding this issue.

Additional Change to Proposed AD

Paragraph (j) of the proposed AD (``Parts Installation
Limitation'') would allow installation of an affected APD if it is
successfully tested and reidentified in accordance with Bombardier
Service Bulletin 84-26-19, Revision `A,' dated February 11, 2019. We
have revised paragraph (j) in this AD to also allow installation of an
affected APD that is tested and reidentified in accordance with
Bombardier Service Bulletin 84-26-19, dated October 24, 2018.

Conclusion

The FAA reviewed the relevant data, considered the comments
received, and determined that air safety and the public interest
require adopting this final rule with the changes described previously
and minor editorial changes. The FAA has 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.
The FAA also determined that these changes will not increase the
economic burden on any operator or increase the scope of this final
rule.

Related Service Information Under 1 CFR Part 51

Bombardier issued Service Bulletin 84-26-19, Revision `A,' dated
February 11, 2019. This service information describes procedures for
identification and testing, and reidentification or replacement if
necessary, of affected APDs. 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

The FAA estimates that this AD affects 65 airplanes of U.S.
registry. The FAA estimates 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
Up to 10 work-hours x $85 per hour = Up to $850
$0
Up to $850
Up to $55,250

The FAA estimates the following costs to do any necessary on-
condition actions that would be required based on the results of any
required actions. The FAA has no way of determining the number of
aircraft that might need these on-condition actions:

Estimated Costs of On-Condition Actions *

Labor cost
Parts cost
Cost per product
Up to 124 work-hours x $85 per hour = Up to $10,540 Up to $51,076 Up to $61,616

* The FAA has received no definitive data to provide cost estimates for
the on-condition return of parts, except the FAA estimates that it
would take about 1 work-hour per product to comply with the associated
paperwork necessary for the return of parts.

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. The FAA does not control warranty coverage for
affected individuals. As a result, the FAA has included all known costs
in the cost estimate.

Paperwork Reduction Act

A federal agency may not conduct or sponsor, and a person is not
required to respond to, nor shall a person be subject to penalty for
failure to comply with a collection of information subject to the
requirements of the Paperwork Reduction Act unless that collection of
information displays a current valid OMB control number. The control
number for the collection of information required by this AD is 2120-
0056. The paperwork cost associated with this AD has been detailed in
the Costs of Compliance section of this document and includes time for
reviewing instructions, as well as completing and reviewing the
collection of information. Therefore, all reporting associated with
this AD is mandatory. Comments concerning the accuracy of this burden
and suggestions for reducing the burden should be directed to
Information Collection Clearance Officer, Federal Aviation
Administration, 10101 Hillwood Parkway, Fort Worth, TX 76177-1524.

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.
The FAA is 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) Will not affect intrastate aviation in Alaska, and
(3) 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):