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PROPOSED AD AUSTRO ENGINE GMBH: Docket No. FAA-2020-0136; Project Identifier MCAI-2019-00114-E.
(a) COMMENTS DUE DATE

    The FAA must receive comments by May 1, 2020.

(b) AFFECTED ADS

    This  AD  replaces AD  2018-18-02,  Amendment 39-19381  (83  FR 53802,
    October 25, 2018).

(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 of the timing
    chain on the affected engines. The  FAA is 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 al-
    ready done.

(g) REQUIRED ACTIONS

(1) Within 30 days after the effective date of this AD, under the Emergen-
    cy Procedures  chapter,  amend  the applicable  airplane flight manual
    (AFM) by  adding the  information in  Figure 1  to paragraph (g)(1) of
    this AD to limit the use of a windmilling restart to only an emergency
    procedure.

       FIGURE 1 TO PARAGRAPH (G)(1)  RESTART IN-FLIGHT BY WINDMILLING    
    ______________________________________________________________________
                     RESTART IN-FLIGHT BY WINDMILLING
    ______________________________________________________________________
    In case of an engine malfunction,  determine  the  root cause and only
    continue if a safe restart is possible.

    1. Max. demonstrated altitude  for immediate restart  by  windmilling:
       15,000 ft.

    2. Max. demonstrated altitude  for  restart  after 10 min. and ambient
       air temperature higher than ISA by windmilling: 10,000 ft.

    3. Max. demonstrated altitude for restart after 5 min. and ambient air
       temperature between ISA  and  ISA minus 10C by windmilling: 10,000
       ft.

    4. Max. demonstrated altitude for restart after 2 min. and ambient air
       temperature below ISA minus 10C by windmilling: 10,000 ft.

    5. Airspeed: See applicable Aircraft Flight Manual.

    6. Power Levers  "IDLE"

    7. Engine Master  "ON"

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

(2) For affected Austro Engine GmbH model E4 engines  installed on Diamond
    Aircraft Industries (DAI)  model Diamond Aircraft (DA) 42 NG and DA 42
    M-NG airplanes, and for Austro Engine GmbH model E4P engines installed
    on DAI model DA 62 airplanes, using AFM Temporary Revision (TR) TR-MAM
    -42-973 and AFM TR TR-MAM-62-240, both dated August 12, 2016, updating
    the applicable AFM is an acceptable method  to  comply  with paragraph
    (g)(1) of this AD.

(h) CREDIT FOR PREVIOUS ACTIONS

    You may take credit  for actions required  by paragraph (g) of this AD
    if you amended the AFM for the affected engine  before  the  effective
    date of this AD in accordance with AD 2018-18-02.

(i) 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 (j)(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.

(j) RELATED INFORMATION

(1) For more information about this AD,  contact  Mehdi Lamnyi,  Aerospace
    Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803;
    phone: 781-238-7743; fax: 781-238-7199; email: Mehdi.Lamnyi@faa.gov.

(2) Refer to European Union Aviation Safety Agency (EASA)  AD 2017-0103R1,
    dated February 25, 2019,  for  more  information.  You may examine the
    EASA AD in the AD docket  on the internet  at https://www.regulations.
    gov by searching for and locating it in Docket No. FAA-2020-0136.

(3) For Austro Engine GmbH service information identified in this AD, con-
    tact  Austro  Engine  GmbH,  Rudolf-Diesel-Strasse 11,  A-2700  Weiner
    Neustadt,  Austria;  phone: +43 2622 23000;  fax: +43 2622 23000-2711;
    website: www.austroengine.at.  For Diamond Aircraft Industries service
    information identified in this AD, contact Diamond Aircraft Industries
    N. A., Otto-Strabe 5, A-2700 Wiener Neustadt, A2700,  Austria;  phone:
    +43 2622 26700; fax: +43 2622 26780; website: www.diamondaircraft.com.
    You may view this referenced service information  at  the  FAA, Engine
    and Propeller Standards Branch,  1200 District Avenue,  Burlington, MA
    01803. For information on the availability of this material at the FAA
    call 781-238-7759.

Issued on March 10, 2020. Lance T. Gant, Director, Compliance & Airworthi-
ness Division, Aircraft Certification Service.

DATES: The FAA must receive comments on this proposed AD by May 1, 2020.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2020-0136; Project Identifier MCAI-2019-00114-E]
RIN 2120-AA64

Airworthiness Directives; Austro Engine GmbH Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD)
2018-18-02, which applies to certain Austro Engine GmbH model E4
engines and to all Austro Engine E4P engines. AD 2018-18-02 requires
replacement of the timing chain and amending certain airplane flight
manuals (AFMs) to limit the use of windmill restarts only as an
emergency procedure. Since the FAA issued AD 2018-18-02, Austro Engine
GmbH revised the applicable Airworthiness Limitation Section (ALS)
including the limitation required by AD 2018-18-02 for the timing chain
subjected to a windmill restart. This proposed AD would require
amendment of certain existing AFMs to limit the use of windmill
restarts and remove the timing chain replacement requirement that
exists in AD 2018-18-02. The timing chain replacement requirement in
accordance with new life limits defined in the revised ALS will be
proposed in a new and separate AD. 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 May 1,
2020.

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 https://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 Austro Engine GmbH 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;
website: www.austroengine.at. For Diamond Aircraft Industries service
information identified in this NPRM, contact Diamond Aircraft
Industries, N. A., Otto-Strabe 5, A-2700 Wiener Neustadt, A2700,
Austria; phone: +43 2622 26700; fax: +43 2622 26780; website:
www.diamondaircraft.com. You may view this service information at the
FAA, Engine and 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 https://www.regulations.
gov by searching for and locating Docket No. FAA-2020-0136;
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),
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: Mehdi Lamnyi, Aerospace Engineer, ECO
Branch, FAA, 1200 District Avenue, Burlington, MA, 01803; phone: 781-
238-7743; fax: 781-238-7199; email: Mehdi.Lamnyi@faa.gov.

SUPPLEMENTARY INFORMATION:

Comments Invited

The FAA invites you to send any written relevant data, views, or
arguments about this proposed AD. Send your comments to an address
listed under the ADDRESSES section. Include "Docket No. FAA-2020-0136;
Project Identifier MCAI-2019-00114-E"
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.

Except for Confidential Business Information as described in the
following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to
https://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.

Confidential Business Information

Confidential Business Information (CBI) is commercial or financial
information that is both customarily and actually treated as private by
its owner. Under the Freedom of Information Act (FOIA) (5 U.S.C. 552),
CBI is exempt from public disclosure. If your comments responsive to
this NPRM contain commercial or financial information that is
customarily treated as private, that you actually treat as private, and
that is relevant or responsive to this NPRM, it is important that you
clearly designate the submitted comments as CBI. Please mark each page
of your submission containing CBI as "PROPIN." The FAA will treat
such marked submissions as confidential under the FOIA, and they will
not be placed in the public docket of this NPRM. Submissions containing
CBI should be sent to Mehdi Lamnyi, Aerospace Engineer, ECO Branch,
FAA, 1200 District Avenue, Burlington, MA, 01803. Any commentary that
the FAA receives which is not specifically designated as CBI will be
placed in the public docket for this rulemaking.

Discussion

The FAA issued AD 2018-18-02, Amendment 39-19381 (83 FR 53802,
October 25, 2018), ("AD 2018-18-02"), for certain Austro Engine GmbH
model E4 engines and for all Austro Engine E4P engines. AD 2018-18-02
requires replacement of the timing chain and amending certain AFMs to
limit the use of windmill restarts. AD 2018-18-02 resulted from reports
of considerable wear of the timing chain on these engines. The FAA
issued AD 2018-18-02 to prevent failure of the engine timing chain.

Actions Since AD 2018-18-02 Was Issued

Since the FAA issued AD 2018-18-02, the European Union Aviation
Safety Agency (EASA), which is the Technical Agent for the Member
States of the European Community, has issued EASA AD 2017-0103R1, dated
February 25, 2019 (referred to after this as "the MCAI"), to address
the unsafe condition on these 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, AE 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. AE also published Mandatory Service Bulletin
(MSB) MSB-E4-017/2, providing instructions to replace the timing
chain for engines with known windmilling restarts, and EASA issued
AD 2017-0103, requiring replacement of the timing chain for engines
with known windmilling restarts, and amendment of the applicable
Aircraft Flight Manual (AFM). Since that [EASA] AD was issued, AE
revised the applicable Airworthiness Limitation Section (ALS)
including, among others, the limitation required by that AD.
Consequently, EASA published AD 2019-0041, requiring accomplishment
of the actions specified in the ALS.

For the reason described above, this [EASA] AD is revised
accordingly, removing the requirement of timing chain replacement.
This action remain required through EASA AD 2019-0041.

This proposed AD, which supersedes AD 2018-18-02, retains the AFM
amendment requirements and removes the timing chain replacement
requirement. The timing chain replacement requirement in accordance
with new life limits defined in the revised ALS will be mandated by a
proposed new and separate AD.

You may obtain further information by examining the MCAI in the AD
docket on the internet at https://www.regulations.gov by searching for
and locating Docket No. FAA-2020-0136.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Diamond Aircraft (DA) Temporary Revision (TR) TR-
MAM-42-973, dated August 12, 2016, for the Diamond Aircraft
Industries (DAI) model DA 42 NG Airplane Flight Manual (AFM) and DA TR
TR-MAM-62-240, dated August 12, 2016, for the DAI model DA 62 NG
AFM. These TRs define the removal of the normal operation procedure for
windmilling restart for the respective airplanes. 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

The FAA is proposing this AD because it evaluated all the relevant
information and determined the unsafe condition described previously is
likely to exist or develop in other products of the same type design.

Proposed AD Requirements

This proposed AD would retain certain requirements of AD 2018-18-02.
This proposed AD would retain the requirement for amending certain
AFMs to limit the use of windmill restarts to emergency procedures and
would remove the requirement for replacing the timing chain.

Costs of Compliance

The FAA estimates that this proposed AD affects 211 engines
installed on airplanes of U.S. registry.

The FAA estimates 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

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

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 removing airworthiness directive (AD)
2018-18-02, Amendment 39-19381 (83 FR 53802, October 25, 2018), and
adding the following new AD: