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2021-24-19 DG FLUGZEUGBAU GMBH: Amendment 39-21840; Docket No. FAA-2021-0792; Project Identifier AD-2020-00593-G.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective January 27, 2022.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD  applies to  DG Flugzeugbau  GmbH Model  DG-500MB and DG-1000M
    gliders, all serial numbers, certificated in any category, with a Solo
    Kleinmotoren GmbH Solo Model 2625 02i engine installed.

(d) SUBJECT

    Joint  Aircraft System  Component (JASC)  Code 7300,  Engine Fuel  and
    Control.

(e) UNSAFE CONDITION

    This AD was prompted by mandatory continuing airworthiness information
    (MCAI) issued by the aviation authority of another country to identify
    and  correct an  unsafe condition  on an  aviation product.  The  MCAI
    describes the unsafe condition as an error in the engine control  unit
    (ECU) software. The FAA is issuing this AD to prevent an injection  of
    fuel  into  one  cylinder  when  the  ECU  is  activated.  The  unsafe
    condition, if not addressed,  could result in difficulty  starting the
    engine and reduced control of the glider.

(f) COMPLIANCE

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

(g) REQUIRED ACTIONS

(1) Within 3 months  after the effective date  of this AD, update  the ECU
    software to software  version V517 Revision  8 in accordance  with the
    Actions  in  Solo  Kleinmotoren  GmbH  Service  Bulletin  No. 4600-11,
    Ausgabe 1 (English translation: Issue 1), dated August 19, 2019.

(2) As  of the  effective date  of this  AD, do  not install  ECU software
    version  V517  Revision  7  or  earlier  on  any  glider  with  a Solo
    Kleinmotoren GmbH Solo Model 2625 02i engine.

(h) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) The Manager, International  Validation 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  (i)(1) of  this AD  or email:  9-AVS-AIR-730
    -AMOC@faa.gov.

(2) 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.

(i) RELATED INFORMATION

(1) For more information about  this AD, contact Jim Rutherford,  Aviation
    Safety Engineer, General Aviation & Rotorcraft Section,  International
    Validation Branch, FAA, 901 Locust,  Room 301, Kansas City, MO  64106;
    phone:    (816)    329-4165;     fax:    (816)    329-4090;     email:
    jim.rutherford@faa.gov.

(2) Refer to  European Union Aviation  Safety Agency (EASA)  AD 2020-0056,
    dated March 13, 2020, for  more information. You may examine  the EASA
    AD in the  AD docket at  https://www.regulations.gov by searching  for
    and locating Docket No. FAA-2021-0792.

(j) 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.

(i) Solo  Kleinmotoren  GmbH  Service  Bulletin  No.  4600-11,  Ausgabe  1
    (English translation: Issue 1), dated August 19, 2019.

NOTE 1 TO PARAGRAPH (j)(2)(i): This service information contains German to
English translation. EASA used the English translation in referencing  the
document from Stemme  AG. For enforceability  purposes, the FAA  will cite
the service information in English as it appears on the document.

(ii) [Reserved]

(3) For service information identified in this AD, contact  Solo Kleinmot-
    oren GmbH, Postfach 600152,  D71050 Sindelfingen, Germany; phone:  +49
    703 1301-0; fax:  +49 703 1301-136;  email: aircraft@solo-germany.com;
    website: https://aircraft.solo.global/gb/.

(4) You may view this  service information at FAA, Airworthiness  Products
    Section, Operational Safety Branch, 901 Locust, Kansas City, MO 64106.
    For information on the availability of this material at the FAA,  call
    (816) 329-4148.

(5) 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  18,  2021. Lance  T.  Gant,  Director,  Compliance &
Airworthiness Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT: Jim Rutherford, Aviation Safety Engineer,
General Aviation  & Rotorcraft  Section, International  Validation Branch,
FAA, 901 Locust, Room 301,  Kansas City, MO 64106; phone:  (816) 329-4165;
fax: (816) 329-4090; email: jim.rutherford@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration


14 CFR Part 39

[Docket No. FAA-2021-0792; Project Identifier AD-2020-00593-G;
Amendment 39-21840; AD 2021-24-19]
RIN 2120-AA64

Airworthiness Directives; DG Flugzeugbau GmbH Gliders

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all
DG Flugzeugbau GmbH Model DG-500MB and DG-1000M gliders with a Solo
Kleinmotoren GmbH Solo Model 2625 02i engine installed. This AD was
prompted by mandatory continuing airworthiness information (MCAI)
issued by the aviation authority of another country to identify and
correct an unsafe condition on an aviation product. The MCAI describes
the unsafe condition as an error in the engine control unit (ECU)
software. This AD requires updating the ECU software. The FAA is
issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective January 27, 2022.

The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of January 27, 2022.

ADDRESSES: For service information identified in this final rule,
contact Solo Kleinmotoren GmbH, Postfach 600152, D71050 Sindelfingen,
Germany; phone: +49 703 1301-0; fax: +49 703 1301-136; email:
germany.com">aircraft@solo-germany.com; website: https://aircraft.solo.global/gb/.
You may view this service information at the FAA, Airworthiness
Products Section, Operational Safety Branch, 901 Locust, Kansas City,
MO 64106. For information on the availability of this material at the
FAA, call (816) 329-4148. It is also available at https://www.regulations.gov
by searching for and locating Docket No. FAA-2021-0792.

Examining the AD Docket


You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2021-0792; 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, the
MCAI, 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: Jim Rutherford, Aviation Safety
Engineer, General Aviation & Rotorcraft Section, International
Validation Branch, FAA, 901 Locust, Room 301, Kansas City, MO 64106;
phone: (816) 329-4165; fax: (816) 329-4090; email:
jim.rutherford@faa.gov.

SUPPLEMENTARY INFORMATION:

Background


The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to all DG Flugzeugbau GmbH
Model DG-500MB and DG-1000M gliders with a Solo Kleinmotoren GmbH Solo
Model 2625 02i engine installed. The NPRM published in the Federal
Register on September 17, 2021 (86 FR 51838). The NPRM was prompted by
MCAI originated by the European Union Aviation Safety Agency (EASA),
which is the Technical Agent for the Member States of the European
Union. EASA issued EASA AD 2020-0056, dated March 13, 2020 (referred to
after this as "the MCAI"), to address an unsafe condition on Solo
Kleinmotoren GmbH Solo Model 2625 02 engines, variation 02i with
electronic fuel injection, installed on but not limited to Binder
Motorenbau, DG-Flugzeugbau, and Schempp-Hirth powered sailplanes
(gliders). The MCAI states:

An error was found in the ECU affected SW [software] that can
cause brief injection of fuel into one cylinder when the ECU is
activated.

This condition, if not corrected, could increase the time needed
to (re)start the engine in flight, possibly resulting in reduced
control of the powered sailplane.

To address this potential unsafe condition, SOLO Kleinmotoren
GmbH, together with the ECU manufactuerer [sic], developed an ECU SW
update and issued the SB [service bulletin] accordingly, providing
installation instructions.

For the reason described above, this [EASA] AD requires an
update of the ECU software.

You may examine the MCAI in the AD docket at https://www.regulations.gov
by searching for and locating Docket No. FAA-2021-0792.

The Model 2625 02i engine does not have an FAA type certificate.
For Model DG-1000M gliders, this engine is part of the glider type
certification. For Model DG-500MB gliders, this engine may be installed
as a Model 2525 02 engine modified with a fuel injection system and re-
identified as a Model 2625 02i engine.

Discussion of Final Airworthiness Directive

Comments


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

Conclusion


This product has been approved by the aviation authority of another
country and is approved for operation in the United States. Pursuant to
the FAA's bilateral agreement with this State of Design Authority, it
has notified the FAA of the unsafe condition described in the MCAI and
service information referenced above. The FAA reviewed the relevant
data and determined that air safety requires adopting this 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 Solo Kleinmotoren GmbH Service Bulletin No. 4600-
11, Ausgabe 1 (English translation: Issue 1), dated August 19, 2019.
This service information specifies procedures for updating the ECU
software to a version that fixes a software error found in previous ECU
software versions. 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 ADDRESSES.

Costs of Compliance


The FAA estimates that this AD affects 4 gliders of U.S. registry.
The FAA estimates that it would take about 2 work-hours per glider to
comply with the requirements of this AD. The average labor rate is $85
per work-hour. Based on these figures, the FAA estimates the cost of
this AD on U.S. operators to be $680 or $170 per glider.

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


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. For the reasons discussed above, I certify 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 adding the following new airworthiness
directive: