DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2020-0136; Project Identifier MCAI-2019-00114-E]
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
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
ADDRESSES: You may send comments, using the procedures found in
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow
instructions for submitting comments.
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,
Branch, FAA, 1200 District Avenue, Burlington, MA, 01803; phone: 781-
238-7743; fax: 781-238-7199; email: Mehdi.Lamnyi@faa.gov.
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.
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.
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
||1 work-hour x $85 per hour =
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
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
(1) Is not a "significant regulatory action" under Executive
(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
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: