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2021-24-10 AUSTRO ENGINE GMBH:
Amendment 39-21831; Docket No. FAA-2021-0781; Project Identifier AD-2021-00775-E. 
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective December 27, 2021.

(b) AFFECTED ADS

    This AD replaces AD 2021-09-04, Amendment 39-21517 (86 FR 21637, April
    23, 2021).

(c) APPLICABILITY

    This AD applies to all Austro Engine GmbH E4 and E4P model diesel pis-
    ton engines.

(d) SUBJECT

    Joint Aircraft System Component (JASC) Code 8550, Reciprocating Engine
    Oil System.

(e) UNSAFE CONDITION

    This AD  was prompted  by reports  of an  oil pump  blockage on the E4
    model diesel  piston engines.  The FAA  is issuing  this AD to prevent
    failure of the engine lubrication system. The unsafe condition, if not
    addressed, could result in failure of the engine, in-flight  shutdown,
    and loss of the airplane.

(f) COMPLIANCE

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

(g) REQUIRED ACTIONS

    For  Austro Engine GmbH E4 and E4P model  diesel piston engines having
    an oil pump,  part number  (P/N) E4A-50-000-BHY,  with a serial number
    (S/N) listed in paragraph 1.2.,  Engines  Affected,  of  Austro Engine
    GmbH  Mandatory  Service  Bulletin  No. MSB-E4-030/4,  Revision No. 4,
    dated March 30, 2021  (the MSB),  within the compliance time specified
    in Table 1 to paragraph (g) of this AD or before further flight, which
    -ever occurs later:

(1) Remove the oil pump, P/N E4A-50-000-BHY, from service and replace with
    a part eligible for installation using the Accomplishment/Instructions
    paragraph 2.2.1 or paragraph 2.2.2, of the MSB, as applicable.

(2) Replace the  oil filter  and  engine  oil  using  the  Accomplishment/
    Instructions,  paragraph  2.2.1 or  paragraph  2.2.2, of  the  MSB, as
    applicable.

    TABLE 1 TO PARAGRAPH (G) – REPLACEMENT OF THE OIL PUMP, OIL FILTER AND
                               ENGINE OIL                                 
    ______________________________________________________________________
                 ENGINE FLIGHT HOURS
                 (FHS) SINCE NEW AS
                 OF MAY 10, 2021             COMPLIANCE TIME (AFTER
    ENGINE       (THE EFFECTIVE DATE         MAY 10, 2021, THE EFFECTIVE
    GROUP        OF AD 2021-09-04)           DATE OF AD 2021-09-04)
    ______________________________________________________________________
    Group 1       10 FHs or less           Within 30 days or before
    engines                                accumulating 10 FHs, or during
    and                                    the next scheduled maintenance,
    Group 2                                whichever occurs first
    engines

    Group 1      More than 10 FHs,         Within 3 months or before
    engines      but less than 50 FHs      accumulating 70 FHs since
                                           new, or during the next
                                           scheduled maintenance,
                                           whichever occurs first

    Group 1       50 FHs or more           Within 3 months or 20 FHs, or
    engines                                during the next scheduled
                                           maintenance, whichever occurs
                                           first

    Group 2       More than 10 FHs         Within 3 months or 100 FHs, or
    engines                                during the next scheduled
                                           maintenance, whichever occurs
                                           first
    ______________________________________________________________________

(h) NO REPORTING REQUIREMENTS

    The reporting requirements in the Accomplishment / Instructions, para-
    graph 2.2., of the MSB, are not required by this AD.

(i) INSTALLATION PROHIBITION

    After the effective date of this AD, do not install onto any engine an
    oil pump,  P/N E4A-50-000-BHY,  with an S/N listed  in paragraph 1.2.,
    Engines Affected, of the MSB.

(j) DEFINITIONS

    For the purpose of this AD:

(1) Group 1 engines are E4 model  diesel piston engines  in  configuration
    "-A" that are installed on single-engine airplanes.

(2) Group 2 engines are E4 model  diesel piston engines  in  configuration
    "-B" or "-C" and E4P model diesel piston engines that are installed on
    twin-engine airplanes.

(3) A "part eligible for installation"  is an oil pump  with a P/N and S/N
    that is not listed in paragraph 1.2., Engines Affected, of the MSB.

(k) CREDIT FOR PREVIOUS ACTIONS

    You may take credit for replacing the oil pump, oil filter, and engine
    oil required by paragraph (g)  of  this  AD if you performed these re-
    placements before the effective date of this AD  using the Accomplish-
    ment/Instructions,  paragraph 2.2., of Austro Engine GmbH MSB No. MSB-
    E4-030, Original Issue, dated February 18, 2021; Revision No. 1, dated
    February 23, 2021; Revision No. 2, dated March 3, 2021 or Revision No.
    3, dated March 18, 2021.

(l) 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
    inspector or local Flight  Standards District Office, as  appropriate.
    If sending information  directly to the  manager of the  certification
    office, send it to the attention of the person identified in paragraph
    (m) of this AD. Information may be emailed 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.

(m) RELATED INFORMATION

    For more information about this AD, contact Wego Wang, Aviation Safety
    Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803;
    phone: (781) 238-7134; fax: (781) 238-7199; email: wego.wang@faa.gov.

(n) MATERIAL INCORPORATED BY REFERENCE

(1) The Director of the Federal Register  approved  the  incorporation  by
    reference (IBR) of  the service information  listed in this  paragraph
    under 5 U.S.C. 552(a) and 1 CFR part 51.

(2) You must use  this service information as applicable to do the actions
    required by this AD, unless the AD specifies otherwise.

(3) The following service information was approved for IBR on May 10, 2021
    (86 FR 21637, April 23, 2021).

(i) Austro Engine GmbH Mandatory Service Bulletin No. MSB-E4-030/4,  Revi-
    sion No. 4, dated March 30, 2021.

(ii) [Reserved]

(4) For service information identified in this AD,  contact  Austro Engine
    GmbH, Rudolf-Diesel-Strasse 11, 2700 Weiner Neustadt, Austria;  phone:
    +43 2622 23000; website: www.austroengine.at.

(5) You may view this service information at FAA,  Airworthiness  Products
    Section,  Operational Safety Branch, 1200 District Avenue, Burlington,
    MA 01803.  For information on the availability of this material at the
    FAA, call (817) 222-5110.

(6) You may view this service information  that is incorporated  by refer-
    ence at the National  Archives and Records Administration  (NARA). For
    information  on  the availability  of  this material  at  NARA, email:
    fr.inspection@nara.gov,  or go  to:  https://www.archives.gov/federal-
    register/cfr/ibr-locations.html.

Issued on November 15, 2021.  Lance T. Gant,  Director,  Compliance & Air-
worthiness Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT:  Wego Wang, Aviation Safety Engineer, ECO
Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: (781) 238-
7134; fax: (781) 238-7199; email: wego.wang@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0781; Project Identifier AD-2021-00775-E;
Amendment 39-21831; AD 2021-24-10]
RIN 2120-AA64

Airworthiness Directives; Austro Engine GmbH Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2021-09-04
for all Austro Engine GmbH E4 and E4P model diesel piston engines. AD
2021-09-04 required replacing a certain oil pump as well as the oil
filter and engine oil. This AD was prompted by reports of an oil pump
blockage on E4 model diesel piston engines. This AD requires replacing
a certain oil pump as well as the oil filter and engine oil. The FAA is
issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective December 27, 2021.
The Director of the Federal Register approved the incorporation by
reference of a certain other publication listed in this AD as of May
10, 2021 (86 FR 21637, April 23, 2021).

ADDRESSES: For service information identified in this final rule,
contact Austro Engine GmbH, Rudolf-Diesel-Strasse 11, 2700 Weiner
Neustadt, Austria; phone: +43 2622 23000; website: www.austroengine.at.
You may view this service information at the Airworthiness Products
Section, Operational Safety Branch, FAA, 1200 District Avenue,
Burlington, MA 01803. For information on the availability of this
material at the FAA, call (817) 222-5110. It is also available at
https://www.regulations.gov by searching for and locating Docket No.
FAA-2021-0781.

Examining the AD Docket

You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2021-0781; 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 final rule, any comments received, and other information. The
address for Docket Operations is U.S. Department of Transportation,
Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200
New Jersey Avenue SE, Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Wego Wang, Aviation Safety Engineer,
ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone:
(781) 238-7134; fax: (781) 238-7199; email: wego.wang@faa.gov.

SUPPLEMENTARY INFORMATION:

Background

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 to supersede AD 2021-09-04, Amendment 39-21517 (86 FR
21637, April 23, 2021), (AD 2021-09-04). AD 2021-09-04 applied to all
Austro Engine GmbH E4 and E4P model diesel piston engines. The NPRM
published in the Federal Register on September 14, 2021 (86 FR 51026).
The NPRM was prompted by reports of an oil pump blockage on E4 model
diesel piston engines caused by oil contamination with casting sand
from the production process of oil pump part number (P/N) E4A-50-000-
BHY. The root cause was found to be an improperly performed sand casted
oil pump housing cleaning process. In the NPRM, the FAA proposed to
continue to require replacement of an affected oil pump, identified by
P/N and serial number (S/N) in Austro Engine GmbH Mandatory Service
Bulletin No. MSB-E4-030/4, Revision No. 4, dated March 30, 2021. In the
NPRM, the FAA also proposed to require replacement of the oil filter
and engine oil.

Discussion of Final Airworthiness Directive

Comments

The FAA received no comments on the NPRM or on the determination of
the costs.

Conclusion

The FAA reviewed the relevant data and determined that air safety
requires adoption of the AD as proposed. Accordingly, the FAA is
issuing this AD to address the unsafe condition on these products. This
AD is adopted as proposed in the NPRM.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Austro Engine GmbH Mandatory Service Bulletin No.
MSB-E4-030/4, Revision No. 4, dated March 30, 2021 (the MSB). This
service information specifies procedures for replacing the affected oil
pumps installed on E4 and E4P model diesel piston engines. This service
information also specifies procedures for replacing the oil filter and
engine oil installed on these engines. In addition, this service
information identifies the applicable S/Ns of affected E4 and E4P model
diesel piston engines, the affected oil pumps requiring replacement,
and an additional oil pump replacement option. The Director of the
Federal Register previously approved the MSB for incorporation by
reference on May 10, 2021 (86 FR 21637, April 23, 2021). 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.

Costs of Compliance

The FAA estimates that this AD affects 55 engines installed on
airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

Estimated Costs

Action Labor cost Parts cost Cost per product Cost on U.S. operators
Remove and replace the oil pump, oil filter, and engine oil 16 work-hours x $85 per hour = $1,360 $1,488 $2,848 $156,640

The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, some of the costs of this AD
may be covered under warranty, thereby reducing the cost impact on
affected individuals.

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 has determined that this AD will not have federalism
implications under Executive Order 13132. This AD will 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 that this AD:
(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 Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 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:

a. Removing Airworthiness Directive 2021-09-04, Amendment 39-21517 (86
FR 21637, April 23, 2021); and

b. Adding the following new airworthiness directive: