Document ID: FAA-2019-0726-0001
Agency: faa
Document Type: Proposed Rule
Title: Airworthiness Directives: De Havilland Aircraft of Canada Limited (Type Certificate previously held by Bombardier, Inc.) Airplanes
Posted Date: 2019-10-30T04:00Z

[Federal Register Volume 84, Number 210 (Wednesday, October 30, 2019)]
[Proposed Rules]
[Pages 58066-58070]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2019-23575]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2019-0726; Product Identifier 2019-NM-102-AD]
RIN 2120-AA64

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

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for certain De Havilland Aircraft of Canada Limited Model DHC-8-400 
series airplanes. This proposed AD was prompted by reports of wear on 
fuel couplings, bonding springs, and sleeves as well as fuel tube end 
ferrules and fuel component end ferrules. This proposed AD would 
require repetitive inspections of certain parts for discrepancies that 
meet specified criteria, and replacement as necessary; repetitive 
inspections of certain parts for damage and wear, and rework of parts; 
and electrical bonding checks of certain couplings. This proposed AD 
would also require revising the existing maintenance or inspection 
program, as applicable, to incorporate new or more restrictive 
airworthiness limitations. For certain airplanes, this proposed AD 
would allow a modification that would terminate the repetitive 
inspections. The FAA is proposing this AD to address the unsafe 
condition on these products.

DATES: The FAA must receive comments on this proposed AD by December 
16, 2019.

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 De 
Havilland Aircraft of Canada Ltd., 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.

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-2019-
0726; 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 NPRM, the regulatory evaluation, any comments received, and other 
information. The street address for Docket Operations is listed above. 
Comments will be available in the AD docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Joseph Catanzaro, Aerospace Engineer, 
Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart 
Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7366; fax 516-
794-5531; email 9-avs-nyaco-cos@faa.gov.

SUPPLEMENTARY INFORMATION: 

Comments Invited

    The FAA invites you to send any written relevant data, views, or 
arguments about this proposal. Send your comments to an address listed 
under the ADDRESSES section. Include ``Docket No. FAA-2019-0726; 
Product Identifier 2019-NM-102-AD'' at the beginning of your comments. 
The FAA specifically invites comments on the overall regulatory, 
economic, environmental, and energy aspects of this NPRM. The FAA will 
consider all comments received by the closing date and may amend this 
NPRM because of those comments.
    The FAA will post all comments received, without change, to http://www.regulations.gov, including any personal information you provide. 
The FAA will also post a report summarizing each substantive verbal 
contact received about this NPRM.

Discussion

    Transport Canada Civil Aviation (TCCA), which is the aviation 
authority for Canada, has issued Canadian AD CF-2017-04R2, dated 
September 25, 2018 (referred to after this 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.
    The FAA has received reports of wear on fuel couplings, bonding 
springs, and sleeves as well as fuel tube end ferrules and fuel 
component end ferrules. The FAA is proposing this AD to address such 
wear, which could reduce the integrity of the electrical bonding paths 
through the fuel line and components, and ultimately lead to fuel tank 
ignition in the event of a lightning strike. See the MCAI for more 
information.
    The FAA issued a related NPRM that proposed to amend 14 CFR part 39 
by adding an AD that would apply to certain Bombardier, Inc., Model 
DHC-8-400 series airplanes. The related NPRM published in the Federal 
Register on July 6, 2018 (83 FR 31488). The related NPRM was also 
prompted by reports of wear on fuel couplings, bonding springs, and 
sleeves as well as fuel tube end ferrules and fuel component end 
ferrules. Since the

[[Page 58067]]

related NPRM was issued, Bombardier developed a new optional 
terminating modification for certain Model DHC-8-400 series airplanes 
and issued associated service information. In addition, Bombardier 
developed new airworthiness limitations related to the identified 
unsafe condition. In light of these changes, the FAA has withdrawn the 
related NPRM as of August 28, 2018 (84 FR 45119), and is now issuing 
this new NPRM for public comment.
    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-2019-
0726.

Related Service Information Under 1 CFR Part 51

    Bombardier has issued Service Bulletin 84-28-20, Revision D, dated 
November 23, 2018. This service information describes procedures for 
repetitive detailed inspections of the clamshell coupling bonding 
wires, fuel couplings, and associated sleeves for discrepancies (wear 
and damage, including discoloration, worn coating, scuffing and 
grooves) that meet specified criteria, and replacement. This service 
information also describes procedures for repetitive detailed 
inspections for damage and wear of the fuel tube end ferrules, fuel 
component end ferrules, and ferrule O-ring flanges, and rework of 
parts.
    Bombardier has also issued Service Bulletin 84-28-21, Revision C, 
dated July 13, 2018. This service information describes procedures for 
a detailed inspection for damage and wear of the fuel tube end 
ferrules, fuel component end ferrules, and ferrule O-ring flanges; 
rework (repair, replacement, or blending, as applicable) of parts; and 
a retrofit (structural rework) of the fuel couplings, isolators, and 
structural provisions.
    Bombardier has also issued Service Bulletin 84-28-26, Revision A, 
dated November 29, 2018. This service information describes procedures 
for electrical bonding checks of all threaded couplings on the inboard 
vent lines in the left and right wings.
    Bombardier has also issued Q400 Dash 8 (Bombardier) Temporary 
Revision ALI-00AS, dated April 24, 2018; and Q400 Dash 8 (Bombardier) 
Temporary Revision ALI-00AT, dated April 24, 2018. This service 
information describes airworthiness limitations for fuel tank systems. 
These documents are distinct since they describe different 
airworthiness limitations.
    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

    This product has been approved by the aviation authority of another 
country, and is approved for operation in the United States. Pursuant 
to a bilateral agreement with the State of Design Authority, the FAA 
has been notified of the unsafe condition described in the MCAI and 
service information referenced above. The FAA is proposing this AD 
because the agency evaluated all the relevant information and 
determined the unsafe condition described previously is likely to exist 
or develop on other products of the same type design.

Proposed Requirements of This NPRM

    This proposed AD would require repetitive inspections of the 
clamshell coupling bonding wires, fuel couplings, and associated 
sleeves for discrepancies that meet specified criteria, and replacement 
as necessary; repetitive inspections of the fuel tube end ferrules, 
fuel component end ferrules, and ferrule O-ring flanges for damage and 
wear, and rework of parts; and electrical bonding checks of all 
threaded couplings on the inboard vent lines in the left and right 
wings. This proposed AD would also require revising the existing 
maintenance or inspection program, as applicable, to incorporate new or 
more restrictive airworthiness limitations.
    This proposed AD would require revisions to certain operator 
maintenance documents to include new actions (e.g., inspections) and 
Critical Design Configuration Control Limitations (CDCCLs). Compliance 
with these actions and CDCCLs 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 
(p)(1) of this proposed AD.

Costs of Compliance

    The FAA estimates that this proposed AD affects 52 airplanes of 
U.S. registry. The FAA estimates the following costs to comply with 
this proposed AD:

                                     Estimated Costs for Required Actions *
----------------------------------------------------------------------------------------------------------------
                                                                                    Cost per       Cost on U.S.
                          Labor cost                              Parts cost        product         operators
----------------------------------------------------------------------------------------------------------------
268 work-hours x $85 per hour = $22,780......................              $0          $22,780       $1,184,560
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* Table does not include estimated costs for revising the maintenance or inspection program.

    The FAA has determined that revising the maintenance or inspection 
program takes an average of 90 work-hours per operator, although this 
number may vary from operator to operator. In the past, the FAA has 
estimated that this action takes 1 work-hour per airplane. Since 
operators incorporate maintenance or inspection program changes for 
their affected fleet(s), the FAA has determined that a per-operator 
estimate is more accurate than a per-airplane estimate. Therefore, the 
FAA estimates the total cost per operator to be $7,650 (90 work-hours x 
$85 per work-hour).

                  Estimated Costs for Optional Actions
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                                                             Cost per
              Labor cost                   Parts cost        product
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525 work-hours x $85 per hour =                $20,906          $65,531
 $44,625..............................
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[[Page 58068]]

    The FAA estimates the following costs to do any necessary on-
condition actions that would be required based on the results of any 
required or optional 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
------------------------------------------------------------------------
                                                             Cost per
              Labor cost                   Parts cost        product
------------------------------------------------------------------------
174 work-hours x $85 per hour =                $16,767          $31,557
 $14,790..............................
------------------------------------------------------------------------

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 proposed 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

    The FAA 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) 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.

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

0
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]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive (AD):

De Havilland Aircraft of Canada Limited (Type Certificate previously 
held by Bombardier, Inc.): Docket No. FAA-2019-0726; Product 
Identifier 2019-NM-102-AD.

(a) Comments Due Date

    The FAA must receive comments by December 16, 2019.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to De Havilland Aircraft of Canada Limited Model 
DHC-8-400, -401 and -402 airplanes, certificated in any category, 
manufacturer serial numbers 4001, 4003, and subsequent.

(d) Subject

    Air Transport Association (ATA) of America Code 28, Fuel.

(e) Reason

    This AD was prompted by reports of wear on fuel couplings, 
bonding springs, and sleeves as well as fuel tube end ferrules and 
fuel component end ferrules. The FAA is proposing this AD to address 
such wear, which could reduce the integrity of the electrical 
bonding paths through the fuel line and components, and ultimately 
lead to fuel tank ignition in the event of a lightning strike.

(f) Compliance

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

(g) Initial Inspection Compliance Times

    For airplanes having serial numbers 4001 and 4003 through 4575 
inclusive that, as of the effective date of this AD, have not done 
the actions specified in Bombardier Service Bulletin 84-28-21: At 
the applicable times specified in paragraph (g)(1) or (2) of this 
AD, do the actions specified in paragraphs (h)(1) and (2) of this 
AD.
    (1) For all airplanes except those identified in paragraph 
(g)(2) of this AD: Within 6,000 flight hours or 36 months, whichever 
occurs first after the effective date of this AD.
    (2) For airplanes with an original airworthiness certificate or 
original export certificate of airworthiness issued on or after the 
effective date of this AD: Within 6,000 flight hours or 36 months, 
whichever occurs first after the date of issuance of the original 
airworthiness certificate or the date of issuance of the original 
export certificate of airworthiness.

(h) Repetitive Inspections and Corrective Actions

    At the applicable times specified in paragraph (g)(1) or (2) of 
this AD, do the actions specified in paragraphs (h)(1) and (2) of 
this AD. Repeat the actions thereafter at intervals not to exceed 
6,000 flight hours or 36 months, whichever occurs first.
    (1) Do a detailed inspection of the clamshell coupling bonding 
wires, fuel couplings, and associated sleeves for discrepancies that 
meet specified criteria, as identified in, and in accordance with 
paragraph 3.B., ``Procedure,'' of the Accomplishment Instructions of 
Bombardier Service Bulletin 84-28-20, Revision D, dated November 23, 
2018. If any conditions are found meeting the criteria specified in 
Bombardier Service Bulletin 84-28-20, Revision D, dated November 23, 
2018, before further flight, replace affected parts with new 
couplings and sleeves of the same part number, in accordance with 
paragraph 3.B., ``Procedure,'' of the Accomplishment Instructions of 
Bombardier Service Bulletin 84-28-20, Revision D, dated November 23, 
2018.
    (2) Do a detailed inspection of the fuel tube end ferrules, fuel 
component end ferrules, and ferrule O-ring flanges for damage and 
wear, and rework (repair, replace, or blend, as applicable) the 
parts, in accordance with paragraph 3.B., ``Procedure,'' of the

[[Page 58069]]

Accomplishment Instructions of Bombardier Service Bulletin 84-28-20, 
Revision D, dated November 23, 2018.

(i) Optional Terminating Action for Repetitive Inspections

    For airplanes having serial numbers 4001 and 4003 through 4575 
inclusive: Doing a detailed inspection of the fuel tube end 
ferrules, fuel component end ferrules, and ferrule O-ring flanges 
for damage and wear, and reworking (repair, replace, or blend, as 
applicable) the parts; and doing a retrofit (structural rework) of 
the fuel couplings, isolators, and structural provisions, in 
accordance with paragraph 3.B., ``Procedure,'' of the Accomplishment 
Instructions of Bombardier Service Bulletin 84-28-21, Revision C, 
dated July 13, 2018, terminates the inspections specified in 
paragraphs (h)(1) and (2) of this AD.

(j) Electrical Bonding Checks

    For airplanes having serial numbers 4001, 4003 through 4489 
inclusive, and 4491 through 4575 inclusive that, as of the effective 
date of this AD, have done the actions specified in Bombardier 
Service Bulletin 84-28-21, Revision A, dated September 29, 2017; and 
airplanes having serial numbers 4576 through 4581 inclusive: Within 
6,000 flight hours or 36 months after the effective date of this AD, 
whichever occurs first, do the actions specified in paragraph (j)(1) 
or (2) of this AD.
    (1) Accomplish electrical bonding checks of all threaded 
couplings on the inboard vent lines in the left and right wings, in 
accordance with paragraph 3.B., ``Procedure,'' of the Accomplishment 
Instructions of Bombardier Service Bulletin 84-28-26, Revision A, 
dated November 29, 2018.
    (2) Do a detailed inspection of the fuel tube end ferrules, fuel 
component end ferrules, and ferrule O-ring flanges for damage and 
wear, and rework (repair, replace, or blend, as applicable) the 
parts; and a retrofit (structural rework) of the fuel couplings, 
isolators, and structural provisions in accordance with paragraph 
3.B., ``Procedure,'' of the Accomplishment Instructions of 
Bombardier Service Bulletin 84-28-21, Revision C, dated July 13, 
2018.

(k) Maintenance or Inspection Program Revision

    Within 30 days after the effective date of this AD, revise the 
existing maintenance or inspection program, as applicable, to 
incorporate the information specified in Q400 Dash 8 (Bombardier) 
Temporary Revision ALI-00AS, dated April 24, 2018; and Q400 Dash 8 
(Bombardier) Temporary Revision ALI-00AT, dated April 24, 2018. 
Except as specified in paragraph (l) of this AD, the initial 
compliance time for doing the tasks in Q400 Dash 8 (Bombardier) 
Temporary Revision ALI-00AS, dated April 24, 2018, is at the time 
specified in Q400 Dash 8 (Bombardier) Temporary Revision ALI-00AS, 
dated April 24, 2018, or within 30 days after the effective date of 
this AD, whichever occurs later.

(l) Initial Compliance Time for Task 284000-419

    The initial compliance time for task 284000-419 is at the time 
specified in paragraph (l)(1) or (2) of this AD, as applicable, or 
within 30 days after the effective date of this AD, whichever occurs 
later.
    (1) For airplanes having serial numbers 4001 and 4003 through 
4575, inclusive: Within 18,000 flight hours or 108 months, whichever 
occurs first, after the earliest date of embodiment of Bombardier 
Service Bulletin 84-28-21 on the airplane.
    (2) For airplanes having serial numbers 4576 and subsequent: 
Within 18,000 flight hours or 108 months, whichever occurs first, 
from the date of issuance of the original airworthiness certificate 
or original export certificate of airworthiness.

(m) No Alternative Actions, Intervals, or Critical Design Configuration 
Control Limitations (CDCCLs)

    After the existing maintenance or inspection program has been 
revised as required by paragraph (k) of this AD, no alternative 
actions (e.g., inspections), intervals, or CDCCLs may be used unless 
the actions, intervals, and CDCCLs are approved as an alternative 
method of compliance (AMOC) in accordance with the procedures 
specified in paragraph (p)(1) of this AD.

(n) No Reporting Requirement

    Although Bombardier Service Bulletin 84-28-20, Revision D, dated 
November 23, 2018, specifies to submit certain information to the 
manufacturer, this AD does not include that requirement.

(o) Credit for Previous Actions

    (1) This paragraph provides credit for the actions required by 
paragraphs (h)(1) and (2) of this AD, if those actions were 
performed before the effective date of this AD using the service 
information specified in paragraph (o)(1)(i), (ii), or (iii) of this 
AD.
    (i) Bombardier Service Bulletin 84-28-20, Revision A, dated 
December 14, 2016.
    (ii) Bombardier Service Bulletin 84-28-20, Revision B, dated 
February 13, 2017.
    (iii) Bombardier Service Bulletin 84-28-20, Revision C, dated 
April 28, 2017.
    (2) For the airplane having serial number 4164, this paragraph 
provides credit for the initial inspections required by paragraphs 
(h)(1) and (2) of this AD, if those actions were performed before 
the effective date of this AD using Bombardier Service Bulletin 84-
28-20, dated September 30, 2016.
    (3) This paragraph provides credit for the actions specified in 
paragraph (i) of this AD if those actions were performed before the 
effective date of this AD using the service information specified in 
paragraph (o)(3)(i), (ii), or (iii) of this AD.
    (i) Bombardier Service Bulletin 84-28-21, dated August 31, 2017.
    (ii) Bombardier Service Bulletin 84-28-21, Revision A, dated 
September 29, 2017.
    (iii) Bombardier Service Bulletin 84-28-21, Revision B, dated 
June 8, 2018.
    (4) This paragraph provides credit for the actions required by 
paragraph (j)(1) of this AD if those actions were performed before 
the effective date of this AD using Bombardier Service Bulletin 84-
28-26, dated August 14, 2018.
    (5) This paragraph provides credit for the actions required by 
paragraph (j)(2) of this AD if those actions were performed before 
the effective date of this AD using Bombardier Service Bulletin 84-
28-21, Revision B, dated June 8, 2018.
    (6) For airplanes having serial numbers 4001, 4003 through 4489 
inclusive, and 4491 through 4575 inclusive, and that are post 
Bombardier Service Bulletin 84-28-21, Revision A, dated September 
29, 2017: This paragraph provides credit for the actions required by 
paragraph (j) of this AD if those actions were performed prior to 
the effective date of this AD using the service information 
specified in paragraph (o)(6)(i) or (ii) of this AD.
    (i) Bombardier Modification Summary Package (ModSum) 
IS4Q2800032, dated February 1, 2018.
    (ii) Any airworthiness limitation change request (ACR) specified 
in figure 1 to paragraph (o)(6)(ii) of this AD.

[[Page 58070]]

[GRAPHIC] [TIFF OMITTED] TP30OC19.001

(p) 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.

(q) Related Information

    (1) Refer to Mandatory Continuing Airworthiness Information 
(MCAI) Canadian AD CF-2017-04R2, dated September 25, 2018, 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-2019-0726.
    (2) For more information about this AD, contact Joseph 
Catanzaro, Aerospace Engineer, Airframe and Propulsion Section, FAA, 
New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 
11590; telephone 516-228-7366; fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov.
    (3) For service information identified in this AD, contact De 
Havilland Aircraft of Canada Ltd., 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.

    Issued in Des Moines, Washington, on October 23, 2019.
Dionne Palermo,
Acting Director, System Oversight Division, Aircraft Certification 
Service.
[FR Doc. 2019-23575 Filed 10-29-19; 8:45 am]
BILLING CODE 4910-13-P