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PROPOSED AD AUSTRO ENGINE GMBH ENGINES: Docket No. FAA-2017-1138; Product Identifier 2017-NE-41-AD.
(a) COMMENTS DUE DATE

    We must receive comments by July 16, 2018.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD  applies to  Austro Engine  GmbH model  E4 engines with serial
    numbers  that  have  a "-B"  or "-C"  configuration and  to model  E4P
    engines, all serial numbers.

(d) SUBJECT

    Joint Aircraft System Component (JASC) Code 8520, Reciprocating Engine
    Power Section.

(e) UNSAFE CONDITION

    This AD  was prompted  by reports  of considerable  wear on the timing
    chain on these engines. We are  issuing this AD to prevent failure  of
    the engine timing chain. The unsafe condition, if not addressed, could
    result in failure  of the engine  timing chain, loss  of engine thrust
    control, and reduced control of the airplane.

(f) COMPLIANCE

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

(g) REQUIRED ACTIONS

(1) Determine whether the engine is a Group 1 or Group 2 engine as follows

(i) A Group 1 engine is an engine equipped  with  a  timing chain that was
    installed on  an engine  that experienced  a windmill restart,  or  an
    engine in which it cannot be determined if the engine experienced  any
    windmilling restarts.

(ii) A Group 2 engine is an engine that is equipped  with  a  timing chain
     that has not experienced any windmilling restarts.

(2) For  Group 1 engines:  Before  the  affected  timing chain exceeds 945
    engine flight hours (EFHs) since installation on an engine,  or within
    110 EFHs after the effective date of this AD,  whichever occurs later,
    replace  the  timing  chain in  accordance  with  the instructions  in
    Technical Details,  Paragraph 2,  in Austro  Engine Mandatory  Service
    Bulletin (MSB) No. MSB-E4-017/2, dated December 2, 2016.

(3) For Group 1 and Group 2 engines:  After the effective date of this AD,
    following each windmill restart of an engine, before the timing  chain
    of that engine exceeds 945 EFHs since first installation on an engine,
    or within 110  EFHs after that  windmilling restart,  whichever occurs
    later, replace the timing chain in accordance with the instructions in
    Technical Details, Paragraph 2, in Austro Engine MSB No. MSB-E4-017/2,
    dated December 2, 2016.

(4) For  Group 1 and Group 2 engines:  Within 30 days  after the effective
    date of  this AD,  amend the  applicable Airplane  Flight Manual under
    Emergency  Procedures  by  adding  the  information  in  figure  1  to
    paragraph (g)(4) of this AD to limit the use of a windmilling  restart
    to only an emergency procedure.
    ______________________________________________________________________
     FIGURE 1 TO PARAGRAPH (G)(4) OF THIS AD – RESTART IN-FLIGHT BY WIND- 
                                               MILLING                    
    ______________________________________________________________________
    Restart in-flight by windmilling

    ! In case of an engine malfunction  determine  the root cause and only
    continue in case a safe restart is possible.

    1. Max. demonstrated altitude  for immediate restart  by  windmilling:
    15.000ft

    2. Max. demonstrated altitude for restart  after 10 min.  and  ambient
    air temperature higher than ISA by windmilling: 10.000ft

    3. Max. demonstrated altitude for restart after 5 min. and ambient air
    temperature between ISA  and  ISA minus 10 °C by windmilling: 10.000ft

    4. Max. demonstrated altitude for restart after 2 min. and ambient air
    temperature below ISA minus 10 °C by windmilling: 10.000ft

    5. Airspeed: see applicable Aircraft Flight Manual

    6. Power Levers – "IDLE"

    7. Engine Master – "ON"

    ! Move power lever slightly forward  to a power rating  assuring  that
    the referring engine is delivering thrust,  as a rotating propeller is
    not a guarantee for a running engine.
    ______________________________________________________________________

(h) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) The Manager,  ECO 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 in-
    spector or local Flight Standards District Office,  as appropriate. If
    sending information directly to the manager of the ECO Branch, send it
    to the attention of the person identified  in paragraph (i)(1) of this
    AD. You may email your request to: ANE-AD-AMOC@faa.gov.

(2) Before using any approved AMOC,  notify your appropriate principal in-
    spector, or lacking  a principal inspector,  the manager of  the local
    flight standards district office/certificate holding district office.

(i) RELATED INFORMATION

(1) For more information about this AD contact Barbara Caufield, Aerospace
    Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803;
    phone 781-238-7146; fax 781-238-7199; email barbara.caufield@faa.gov.

(2) Refer to European Aviation Safety Agency AD 2017-0103,  dated June 14,
    2017,  for more information.  You may  examine the  EASA AD  in the AD
    docket on the internet at http://www.regulations.gov by searching  for
    and locating it in Docket No. FAA-2017-1138.

(3) For service information identified in this AD,  contact  Austro Engine
    GmbH, Rudolf-Diesel-Strasse 11, A-2700 Weiner Neustadt, Austria; phone
    +43 2622 23000; fax +43 2622 23000-2711; internet www.austroengine.at.
    You may view this referenced service information at the FAA,  Engine &
    Propeller Standards Branch,  1200 District Avenue, Burlington, MA. For
    information on the availability of this material at the FAA, call 781-
    238-7759.

Issued  in  Burlington, Massachusetts, on May 23, 2018.  Robert J. Ganley,
Manager,  Engine and Propeller  Standards Branch,  Aircraft  Certification
Service.

DATES: We must receive comments on this proposed AD by July 16, 2018.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-1138; Product Identifier 2017-NE-41-AD]
RIN 2120-AA64

Airworthiness Directives; Austro Engine GmbH Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: We propose to adopt a new airworthiness directive (AD) for
certain Austro Engine GmbH model E4 engines and for all model E4P
engines. This proposed AD was prompted by reports of considerable wear
on the timing chain on these engines. This proposed AD would require
replacement of the timing chain and amending certain airplane flight
manuals to limit use of windmill restarts. We are proposing this AD to
address the unsafe condition on these products.

DATES: We must receive comments on this proposed AD by July 16, 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 Austro
Engine GmbH, Rudolf-Diesel-Strasse 11, A-2700 Weiner Neustadt, Austria;
phone: +43 2622 23000; fax: +43 2622 23000-2711; internet:
www.austroengine.at. You may view this service information at the FAA,
Engine & Propeller Standards Branch, 1200 District Avenue, Burlington,
MA, 01803. For information on the availability of this material at the
FAA, call 781-238-7759.

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-2017-1138;
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 mandatory continuing airworthiness information (MCAI),
the regulatory evaluation, any comments received, and other
information. The street address for Docket Operations (phone: 800-647-
5527) is listed above. Comments will be available in the AD docket
shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Barbara Caufield, Aerospace Engineer,
ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone:
781-238-7146; fax: 781-238-7199; email: barbara.caufield@faa.gov.

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-2017-1138;
Product Identifier 2017-NE-41-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 because
of 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 Community, has issued EASA
AD 2017-0103, dated June 14, 2017 (referred to after this as the MCAI),
to correct an unsafe condition for the specified products. The MCAI
states:

Considerable wear of the timing chain has been detected on some
engines. This may have been caused by windmilling restarts, which
are known to cause high stress to the timing chain.

This condition, if not detected and corrected, could lead to
failure of the timing chain and consequent engine power loss,
possibly resulting in reduced control of the aeroplane.

To address this potential unsafe condition, Austro Engine
included instructions in the engine maintenance manual to
periodically inspect the condition of the timing chain and,
depending on findings, to replace the timing chain and the chain
wheel. The operation manual was updated to allow windmilling restart
only as an emergency procedure.

More recently, Austro Engines published Mandatory Service
Bulletin (MSB) MSB-E4-017/2, providing instructions to replace the
timing chain for engines with known windmilling restarts. For the
reason described above, this [EASA] AD requires replacement of the
timing chain for engines with known windmilling restarts, and
requires amendment of the applicable Aircraft Flight Manual (AFM).

You may obtain further information by examining the MCAI in the AD
docket on the internet at http://www.regulations.gov by searching for
and locating Docket No. FAA-2017-1138.

Related Service Information Under 1 CFR Part 51

We reviewed Austro Engine GmbH Mandatory Service Bulletin (MSB) No.
MSB-E4-017/2, dated December 2, 2016. The MSB describes procedures for
replacement of the timing chain. 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 EASA, and is approved for
operation in the United States. Pursuant to our bilateral agreement
with the European Community, EASA has notified us of the unsafe
condition described in the MCAI and service information referenced
above. We are proposing this AD because we evaluated all the relevant
information provided by EASA and determined the unsafe condition
described previously is likely to exist or develop on other products of
the same type design.

Proposed AD Requirements


This proposed AD would require replacement of the timing chain and
amending certain airplane flight manuals to limit use of windmill
restarts.

Costs of Compliance

We estimate that this proposed AD affects 211 engines installed on
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
Amend AFM 1 work hour x $85 per hour = $85 $0 $85 $17,935
Remove and replace timing chain 8 work-hours x $85 per hour = $680 775 1,455 307,005

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 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 engines, propellers, and
associated appliances to the Manager, Engine and Propeller Standards
Branch, Policy and Innovation 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.

Sec. 39.13 [Amended]

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