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2020-09-12 DE HAVILLAND AIRCRAFT OF CANADA LIMITED (TYPE CERTIFICATE PREVIOUSLY HELD BY BOMBARDIER, INC.):
Amendment 39-19908; Docket No. FAA-2020-0101; Product Identifier 2019-NM-190-AD.

(a) EFFECTIVE DATE

    This AD is effective June 24, 2020.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD  applies to De Havilland Aircraft of Canada Limited Model DHC-
    8-400, -401, and -402 series airplanes,  certificated in any category,
    serial numbers 4001 and subsequent.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 55, Stabilizers.

(e) REASON

    This AD was prompted  by a report  that certain elevator power control
    unit (PCU) arm  fittings have nonconforming  fillet radii. The  FAA is
    issuing this AD to address elevator PCU assemblies with  nonconforming
    fillet radii, which could lead to premature failure of the fitting and
    a jam  in one  elevator; if  the fittings  on both  elevators fail,  a
    complete loss of elevator control could occur.

(f) COMPLIANCE

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

(g) DEFINITION

    Affected elevator PCU assemblies are those having part number 85527021
    -005 or 85527021-006, and having serial number MMC4255 through MMC4276
    inclusive.

(h) INSPECTIONS

    For airplanes having serial numbers 4001 through 4620 inclusive, with-
    in  8,000  flight  cycles  on  the  elevator  PCU  assembly  after the
    effective date of this AD, or before the accumulation of 30,000  total
    flight cycles on the elevator PCU assembly, whichever occurs first: Do
    the actions specified in paragraphs (h)(1) and (2) of this AD.

(1) Inspect to determine the part number and serial number  of each eleva-
    tor  PCU assembly  installed on  the airplane.  A  review  of airplane
    maintenance records is  acceptable in lieu  of this inspection  if the
    part number  and serial  number of  the elevator  PCU assembly  can be
    conclusively determined from that review.

(2) If, during any inspection or records review required  by paragraph (h)
    (1) of  this AD,  any affected  elevator PCU  assembly is  found, do a
    detailed inspection of  the elevator PCU  arm fittings for  undersized
    fillet radii and cracks of the fillet radii in accordance with Part  A
    of the Accomplishment Instructions of De Havilland Aircraft of  Canada
    Limited Service Bulletin 84-55-10, Revision A, dated July 25, 2019. If
    no undersized fillet  radii or cracks  of the fillet  radii are found,
    before further flight, re-identify the affected elevator PCU  assembly
    in accordance  with the  Accomplishment Instructions  of De  Havilland
    Aircraft  of  Canada  Limited  Service Bulletin 84-55-10,  Revision A,
    dated July 25, 2019.

(i) CORRECTIVE ACTIONS

    If during any inspection of the elevator PCU arm fittings  required by
    paragraph (h)(2) of this AD, any undersized fillet radii or cracks  of
    the  fillet  radii  are  found,  before  further  flight,  replace the
    elevator PCU arm fittings  and re-identify each affected  elevator PCU
    assembly in accordance  with Part B of the Accomplishment Instructions
    of De Havilland Aircraft of Canada Limited Service Bulletin  84-55-10,
    Revision A, dated July 25, 2019.

(j) PARTS INSTALLATION LIMITATION

    As of the effective date of this AD, no person may install an affected
    elevator  PCU  assembly  on  any  airplane,  unless  it  has  been  re
    -identified in accordance with  the Accomplishment Instructions of  De
    Havilland  Aircraft  of  Canada  Limited  Service  Bulletin  84-55-10,
    Revision A, dated July 25, 2019.

(k) CREDIT FOR PREVIOUS ACTIONS

    This paragraph provides credit for actions required  by paragraphs (h)
    and (i) of this AD,  if those actions were performed before the effec-
    tive date  of this  AD  using  De Havilland Aircraft of Canada Limited
    Service Bulletin 84-55-10, dated May 29, 2019.

(l) NO REPORTING REQUIREMENT

    Although  De Havilland  Aircraft  of  Canada Limited  Service Bulletin
    84-55-10, Revision A, dated July 25, 2019, specifies to submit certain
    information  to  the  manufacturer,  this  AD  does  not  include that
    requirement.

(m) 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;
    phone:  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
    instructions   from   a  manufacturer,   the   instructions  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  Limitedís   TCCA  Design   Approval
    Organization (DAO). If approved by the DAO, the approval must  include
    the DAO-authorized signature.

(n) RELATED INFORMATION

(1) Refer   to   Mandatory  Continuing  Airworthiness  Information  (MCAI)
    Canadian AD CF-2019-36,  dated October 18, 2019,  for related informa-
    tion. 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-
    2020-0101.

(2) For more information about this AD,  contact Andrea Jimenez, Aerospace
    Engineer,  Airframe and Propulsion Section, FAA,  New York ACO Branch,
    1600 Stewart Ave., Suite 410, Westbury, NY 11590; phone: 516-228-7330;
    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 (o)(3)
    and (4) of this AD.

(o) 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) De Havilland  Aircraft  of  Canada  Limited Service Bulletin 84-55-10,
    Revision A, dated July 25, 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; phone: 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,  Airworthiness Prod-
    ucts Section,  Operational  Safety  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 May 6, 2020. Lance T. Gant, Director, Compliance & Airworthiness
Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT: Andrea Jimenez,  Aerospace Engineer, Air-
frame and Propulsion Section, FAA, New York ACO Branch,  1600 Stewart Ave-
nue, Suite 410, Westbury, NY 11590; phone: 516-228-7330; 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-2020-0101; Product Identifier 2019-NM-190-AD; Amendment
39-19908; AD 2020-09-12]
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 that certain elevator power
control unit (PCU) arm fittings have nonconforming fillet radii. This
AD requires an inspection for affected elevator PCU assemblies,
inspections of affected elevator PCU arm fittings for nonconforming
fillet radii and cracks, replacement if necessary, and re-
identification of the affected elevator PCU assemblies. The FAA is
issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective June 24, 2020.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of June 24,
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;
phone: 416-375-4000; fax: 416-375-4539; email: thd@dehavilland.com;
internet: https://dehavilland.com. You may view this service
information at the FAA, Airworthiness Products Section, Operational
Safety 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-2020-0101.

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-2020-
0101; 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, 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: Andrea Jimenez, Aerospace Engineer,
Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart
Avenue, Suite 410, Westbury, NY 11590; phone: 516-228-7330; 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-2019-36, dated October
18, 2019 (``AD CF-2019-36'') (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 series 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-2020-0101.
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
published in the Federal Register on February 24, 2020 (85 FR 10344).
The NPRM was prompted by a report that certain elevator PCU arm
fittings have nonconforming fillet radii. The NPRM proposed to require
an inspection for affected elevator PCU assemblies, inspections of
affected elevator PCU arm fittings for nonconforming fillet radii and
cracks, replacement if necessary, and re-identification of the affected
elevator PCU assemblies. The FAA is issuing this AD to address elevator
PCU assemblies with nonconforming fillet radii, which could lead to
premature failure of the fitting and a jam in one elevator; if the
fittings on both elevators fail, a complete loss of elevator control
could occur. See the MCAI for additional background information.

Comments

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

Conclusion

The FAA 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. 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.

Related Service Information Under 1 CFR Part 51


De Havilland Aircraft of Canada Limited has issued Service Bulletin
84-55-10, Revision A, dated July 25, 2019. This service information
describes procedures for an inspection for affected elevator PCU
assemblies, inspections of affected elevator PCU arm fittings for
nonconforming fillet radii and cracks, replacement if necessary, and
re-identification of the affected elevator PCU assemblies. 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 38 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
5 work-hours x $85 per hour = $425
$0
$425
$16,150

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

Estimated Costs of On-Condition Actions

Labor cost
Parts cost
Cost per product
14 work-hours x $85 per hour = $1,190 Up to $9,060 ($1,510 per elevator PCU arm fittings - 6 total per airplane) Up to $10,250

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.
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.

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):