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PROPOSED AD 328 SUPPORT SERVICES GMBH (TYPE CERTIFICATE PREVIOUSLY HELD BY AVCRAFT AEROSPACE GMBH; FAIRCHILD DORNIER GMBH; DORNIER LUFTFAHRT GMBH): Docket No. FAA-2018-0503; Product Identifier 2018-NM-048-AD.
(a) COMMENTS DUE DATE

    We must receive comments by July 23, 2018.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD  applies to  all 328  Support Services  GmbH (Type Certificate
    previously  held  by  AvCraft Aerospace GmbH;  Fairchild Dornier GmbH;
    Dornier Luftfahrt GmbH) Model 328-100 and -300 airplanes, certificated
    in any category.

(d) SUBJECT

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

(e) REASON

    This AD was prompted by reports indicating corrosion on the horizontal
    stabilizer bearing supports at  the contact surface to  the horizontal
    stabilizer rear spar. We are  issuing this AD to address  corrosion on
    the horizontal stabilizer bearing supports and rear spar, which  could
    lead  to failure  of the  fitting and  loss of  one load  path of  the
    horizontal  stabilizer  attachment,  and  possibly  result  in reduced
    controllability of the airplane.

(f) COMPLIANCE

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

(g) INSPECTION AND MODIFICATION

(1) At the applicable time specified  in paragraph (g)(3)(i) or (g)(3)(ii)
    of  this  AD,  do a detailed visual inspection and an eddy current in-
    spection for corrosion and any other damage  (i.e., cracking and chaf-
    ing) of the horizontal stabilizer rear bearing supports  in accordance
    with  the  Accomplishment  Instructions  of  328 Support Services GmbH
    Service Bulletin  SB-328-55-557,  Revision 1,  dated  February 1, 2018
    (for  Model 328-100 airplanes);  or  328 Support Services GmbH Service
    Bulletin SB-328J-55-324, Revision 1, dated February 1, 2018 (for Model
    328-300 airplanes); as applicable.

(2) At the applicable time specified in paragraph (g)(3)(i)  or (g)(3)(ii)
    of  this  AD, modify the horizontal stabilizer rear spar in accordance
    with the Accomplishment Instructions of 328 Support Services GmbH Ser-
    vice Bulletin SB-328-55-557,  Revision 1,  dated February 1, 2018 (for
    Model 328-100 airplanes) or 328 Support Services GmbH Service Bulletin
    SB-328J-55-324, Revision 1,  dated February 1, 2018 (for Model 328-300
    airplanes); as applicable.

(3) Do the actions  in paragraphs (g)(1) and (g)(2) at the applicable com-
    pliance time specified in paragraph (g)(3)(i) or (g)(3)(ii) of this AD

(i) For Group 1 airplanes  as identified in 328 Support Services GmbH Ser-
    vice Bulletin SB-328-55-557,  Revision 1,  dated February 1, 2018 (for
    Model 328-100 airplanes) or 328 Support Services GmbH Service Bulletin
    SB-328J-55-324, Revision 1,  dated February 1, 2018 (for Model 328-300
    airplanes);  as  applicable:  Within 1,000 flight cycles  or 8 months,
    whichever occurs first after the effective date  of this AD.

(ii) For Group 2 airplanes as identified in 328 Support Services GmbH Ser-
     vice Bulletin SB-328-55-557,  Revision 1, dated February 1, 2018 (for
     Model 328-100 airplanes); or 328 Support Services GmbH Service Bulle-
     tin SB-328J-55-324, Revision 1 dated February 1, 2018 (for Model 328-
     300 airplanes); as applicable: Within 5,000 flight hours or 30 months
     whichever occurs first after the effective date of this AD.

(h) CORRECTIVE ACTION

    If, during the inspections required by paragraph (g) of this AD,  cor-
    rosion  or  any other damage (i.e., cracking and chafing) is detected,
    before further flight, replace the affected horizontal stabilizer rear
    bearing supports in accordance with the Accomplishment Instructions of
    328 Support Services GmbH Service Bulletin SB-328-55-557,  Revision 1,
    dated February 1, 2018 (for Model 328-100 airplanes);  or  328 Support
    Services  GmbH  Service  Bulletin  SB-328J-55-324,  Revision 1,  dated
    February 1, 2018 (for Model 328-300 airplanes); as applicable.

(i) PARTS INSTALLATION PROHIBITION

    As of the applicable time specified in paragraph (i)(1)  or  (i)(2) of
    this  AD,  no person  may install a horizontal stabilizer rear bearing
    support, part number 001B551A1441000, on any airplane.

(1) For  Group 1 airplanes as identified in 328 Support Services GmbH Ser-
    vice Bulletin SB-328-55-557,  Revision 1,  dated February 1, 2018 (for
    Model 328-100 airplanes) or 328 Support Services GmbH Service Bulletin
    SB-328J-55-324, Revision 1,  dated February 1, 2018 (for Model 328-300
    airplanes); as applicable: After replacement of the horizontal stabil-
    izer rear bearing supports as required by paragraph (h) of this AD.

(2) For Group 2 airplanes  as identified in 328 Support Services GmbH Ser-
    vice Bulletin SB-328-55-557,  Revision 1,  dated February 1, 2018 (for
    Model 328-100 airplanes) or 328 Support Services GmbH Service Bulletin
    SB-328J-55-324, Revision 1,  dated February 1, 2018 (for Model 328-300
    airplanes); as applicable: As of the effective date of this AD.

(j) CREDIT FOR PREVIOUS ACTIONS

    This paragraph  provides credit for actions required  by paragraph (g)
    of this AD,  if those actions were performed before the effective date
    of this AD using 328 Support Services GmbH Service Bulletin SB-328-55-
    557,  dated  September 1, 2017  (for Model 328-100 airplanes);  or 328
    Support Services GmbH Service Bulletin SB-328J-55-324, dated September
    1, 2017 (for Model 328-300 airplanes).

(k) OTHER FAA AD PROVISIONS

    The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs):  The Manager, International
    Section, Transport Standards 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 International Sec-
    tion,  send it to the attention of the person identified  in paragraph
    (l)(2) of this AD.  Information  may  be  emailed  to: 9-ANM-116-AMOC-
    REQUESTS@faa.gov.   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,  International
    Section, Transport  Standards Branch,  FAA; or  the European  Aviation
    Safety  Agency  (EASA); or  328  Support Services  GmbH's  EASA Design
    Organization Approval (DOA). If approved by the DOA, the approval must
    include the DOA-authorized signature.

(l) RELATED INFORMATION

(1) Refer  to  Mandatory Continuing Airworthiness Information  (MCAI) EASA
    Airworthiness Directive 2017-0239 dated November 30, 2017, for related
    information.  This MCAI may be found in the AD docket  on the internet
    at http://www.regulations.gov by searching for and locating Docket No.
    FAA-2018-0503.

(2) For more information about this AD,  contact Todd Thompson,  Aerospace
    Engineer, International Section, Transport Standards Branch, FAA, 2200
    South 216th Street,  Des Moines, WA 98198;  telephone and fax 206-231-
    3228.

(3) For service information identified  in  this  AD,  contact 328 Support
    Services GmbH, Global Support Center, P.O. Box 1252, D-82231 Wessling,
    Federal Republic of Germany;  telephone  +49 8153 88111 6666;  fax +49
    8153 88111 6565;  email  gsc.op@328support.de;   internet  http://www.
    328support.de.  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 May 24, 2018. James Cashdollar, Acting
Director, System Oversight Division, Aircraft Certification Service.

DATES: We must receive comments on this proposed AD by July 23, 2018.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2018-0503; Product Identifier 2018-NM-048-AD]
RIN 2120-AA64

Airworthiness Directives; 328 Support Services GmbH (Type
Certificate Previously Held by AvCraft Aerospace GmbH; Fairchild
Dornier GmbH; Dornier Luftfahrt GmbH) Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: We propose to adopt a new airworthiness directive (AD) for all
328 Support Services GmbH Model 328-100 and -300 airplanes. This
proposed AD was prompted by reports indicating corrosion on the
horizontal stabilizer bearing supports at the contact surface to the
horizontal stabilizer rear spar. This proposed AD would require
inspections for corrosion and any other damage (i.e., cracking and
chafing) of the horizontal stabilizer rear bearing supports,
replacement of the affected horizontal stabilizer rear bearing supports
if necessary, and modification of the horizontal stabilizer rear spar.
We are proposing this AD to address the unsafe condition on these
products.

DATES: We must receive comments on this proposed AD by July 23, 2018.

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 328
Support Services GmbH, Global Support Center, P.O. Box 1252, D-82231
Wessling, Federal Republic of Germany; telephone +49 8153 88111 6666;
fax +49 8153 88111 6565; email gsc.op@328support.de; internet http://
www.328support.de. 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-2018-0503;
or in person at the Docket Management Facility 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 the Docket Operations
office (telephone 800-647-5527) is in the ADDRESSES section. Comments
will be available in the AD docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Todd Thompson, Aerospace Engineer,
International Section, Transport Standards Branch, FAA, 2200 South
216th St., Des Moines, WA 98198; telephone and fax 206-231-3228.

SUPPLEMENTARY INFORMATION:

Comments Invited

We invite 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-2018-0503;
Product Identifier 2018-NM-048-AD" at the beginning of your comments.
We specifically invite comments on the overall regulatory, economic,
environmental, and energy aspects of this NPRM. We will consider all
comments received by the closing date and may amend this NPRM based on
those comments.

We will post all comments we receive, without change, to http://www.
regulations.gov, including any personal information you provide. We
will also post a report summarizing each substantive verbal contact we
receive about this NPRM.

Discussion

The European Aviation Safety Agency (EASA), which is the Technical
Agent for the Member States of the European Union, has issued EASA
Airworthiness Directive 2017-0239, dated November 30, 2017 (referred to
after this as the Mandatory Continuing Airworthiness Information, or
"the MCAI"), to correct an unsafe condition for all 328 Support
Services GmbH Model 328-100 and -300 airplanes. The MCAI states:

Occurrences were reported on horizontal stabilizer bearing
supports being found corroded at the contact surface to the
horizontal stabilizer rear spar. The corroded area was at the lower
flange position, which is connected to the stabilizer rear spar and
not visible without detachment of the fitting. Investigation
determined that the corrosion is triggered by galvanic effect, due
to a direct contact between the horizontal stabilizer rear spar,
made from CFRP (carbon fibre reinforced plastic), and the aluminium
rear attachment fitting.

This condition, if not detected and corrected, could lead to
failure of the fitting and loss of one load path of the horizontal
stabilizer attachment, possibly resulting in reduced control of the
aeroplane.

To address this potential unsafe condition, 328 Support Services
GmbH (328 SSG) issued Service Bulletin (SB) SB-328-55-557 and SB-
328J-55-324 to provide instructions for inspection of the affected
area, replacement of the parts, and modification to improve
corrosion behaviour by incorporating of glass fibre layer.

For the reasons described above, this [EASA] AD requires a one-
time inspection [detailed visual inspection and an eddy current
inspection for chafing and corrosion] of the horizontal stabilizer
rear bearing supports, and, depending on findings, accomplishment of
applicable corrective action(s) [replacement of the affected
horizontal stabilizer rear bearing supports]. This [EASA] AD also
requires a modification of the horizontal stabilizer rear spar,
irrespective of findings.

You may examine the MCAI in the AD docket on the internet at http://
www.regulations.gov by searching for and locating Docket No. FAA-2018-
0503.

Related Service Information Under 1 CFR Part 51

328 Support Services GmbH has issued Service Bulletin SB-328-55-
557, Revision 1, dated February 1, 2018; and Service Bulletin SB-328J-
55-324, Revision 1, dated February 1, 2018. This service information
describes a detailed visual inspection and an eddy current inspection
for corrosion and any other damage (i.e., cracking and chafing) of the
horizontal stabilizer rear bearing supports, modification of the
horizontal stabilizer rear spar, and replacement of the affected
horizontal stabilizer rear bearing supports if necessary. These
documents are distinct since they apply to different airplane models.
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 and Requirements of This Proposed AD

This product has been approved by the aviation authority of another
country, and is approved for operation in the United States. Pursuant
to our bilateral agreement with the State of Design Authority, we have
been notified of the unsafe condition described in the MCAI and service
information referenced above. We are proposing this AD because we
evaluated all pertinent information and determined an unsafe condition
exists and is likely to exist or develop on other products of the same
type design.

Costs of Compliance

We estimate that this proposed AD affects 27 airplanes of U.S.
registry.

We estimate the following costs to comply with this proposed AD:

Estimated Costs

Action Labor cost Parts cost Cost per product Cost on U.S. operators
Detailed visual inspection and eddy current inspection 4 work-hours x $85 per hour = $340 $0 $340 $9,180
Modification 16 work-hours x $85 per hour = $1,360 0 1,360 36,720

We estimate the following costs to do any necessary replacement
that would be required based on the results of the proposed inspection.
We have no way of determining the number of aircraft that might need
this replacement:

On-Condition Costs

Action Labor cost Parts cost Cost per product
Replacement 24 work-hours x $85 per hour = $2,040 (*) $2,040

* We have received no definitive data that would enable us to provide part
cost estimates for the on-condition action specified in this proposed AD.

Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, section 106, describes the
authority of the FAA Administrator. Subtitle VII: Aviation Programs,
describes in more detail the scope of the Agency's authority.

We are issuing this rulemaking under the authority described in
Subtitle VII, Part A, Subpart III, Section 44701: "General
requirements." Under that section, Congress charges the FAA with
promoting safe flight of civil aircraft in air commerce by prescribing
regulations for practices, methods, and procedures the Administrator
finds necessary for safety in air commerce. This regulation is within
the scope of that authority because it addresses an unsafe condition
that is likely to exist or develop on products identified in this
rulemaking action.

This 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 to the Director of the System Oversight
Division.

Regulatory Findings

We 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. Is not a "significant rule" under the DOT Regulatory Policies
and Procedures (44 FR 11034, February 26, 1979);

3. Will not affect intrastate aviation in Alaska; and

4. Will not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.

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.

39.13 [Amended]

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