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PROPOSED 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  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, inclu-
    sive:  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 man-
    ufacturer, 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.

                   FIGURE 1 TO PARAGRAPH (O)(6)(II)  ACRS
                   _______________________________________
                       ACR NUMBER     DATED
                   _______________________________________
                       400-072     January 24, 2018
                       400-073     January 23, 2018
                       400-074     January 24, 2018
                       400-077     February 27, 2018
                       400-078     March 21, 2018
                       400-079     April 18, 2018
                       400-080     April 30, 2018
                       400-081     May 4, 2018
                       400-082     May 4, 2018
                       400-083     June 4, 2018
                       400-084     May 18, 2018
                   _______________________________________

(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 infor-
    mation.  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, Act-
ing Director, System Oversight Division, Aircraft Certification Service.

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

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).

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

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 related NPRM was issued, Bombardier developed a new
optional terminating modification for certain Model DHC-8-400 series air-
planes 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 *

Labor cost
Parts cost
Cost per product
Cost on U.S. operators
268 work-hours x $85 per hour = $22,780
$0
$22,780
$1,184,560

* 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

Labor cost
Parts cost Cost per product
525 work-hours x $85 per hour = $44,625
$20,906
$65,531

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

Labor cost
Parts cost
Cost per product
174 work-hours x $85 per hour = $14,790
$16,767
$31,557

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

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):