DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2021-0212; Project Identifier 2018-CE-032-AD; Amendment
39-21715; AD 2021-18-14]
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)
DG Flugzeugbau GmbH Models DG-808C and DG-1000T gliders. This AD was
prompted by mandatory continuing airworthiness information (MCAI)
originated by an aviation authority of another country to identify and
correct an unsafe condition on an aviation product. The MCAI identifies
the unsafe condition as damaged fuel hoses due to environmental and
fatigue deterioration. This AD requires inspecting the polyurethane
(PU) fuel hoses, replacing the PU fuel hoses if there is damage, and
establishing a life limit for the PU fuel hoses. The FAA is issuing
this AD to address the unsafe condition on these products.
DATES: This AD is effective November 4, 2021.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of November 4,
ADDRESSES: For service information identified in this final rule,
contact DG Flugzeugbau GmbH, Otto-Lilienthal Weg 2, D-76646 Bruchsal,
Germany; phone: +49 (0)7251 3202-0; email: email@example.com;
website: https://www.dg-flugzeugbau.de/. 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-2021-0212.
Examining the AD Docket
You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2021-0212; 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:
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
Models DG-808C and DG-1000T gliders. The NPRM published in the Federal
Register on July 1, 2021 (86 FR 35027). The NPRM was prompted by MCAI
originated by the European Aviation Safety Agency (EASA), which is the
Technical Agent for the Member States of the European Union. EASA has
issued EASA AD 2018-0127, dated June 11, 2018 (referred to after this
as ``the MCAI''), to address an unsafe condition on DG Flugzeugbau GmbH
Models DG-808C and DG-1000T gliders. The MCAI states:
An occurrence was reported where, during accomplishment of a 10
years inspection on a DG-808C powered sailplane, a damaged (broken)
PU [polyurethane] fuel hose was found. The result of subsequent
investigation indicated that the damage mode has features of
environmental and fatigue deterioration. Additionally, it was
determined that similar PU fuel hoses are also installed on other
powered sailplane types of the same manufacturer.
This condition, if not detected and corrected, could lead to
reduced or interrupted fuel supply to the engine, consequent loss of
the available power or fire, possibly resulting in reduced control
of the powered sailplane.
To address this potential unsafe condition, DG-Flugzeugbau GmbH
issued the applicable TN [Technical Note], providing instructions to
inspect the affected parts and replace these with serviceable parts.
Additionally, service life limits were established for those
For the reasons described above, this [EASA] AD requires
repetitive inspections of the affected parts. This [EASA] AD also
requires replacement of the affected parts with serviceable parts
and introduces life limits for serviceable parts.
You may examine the MCAI in the AD docket at https://www.regulations.gov
by searching for and locating Docket No. FAA-2021-0212.
Discussion of Final Airworthiness Directive
The FAA received no comments on the NPRM or on the determination of
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
Related Service Information Under 1 CFR Part 51
The FAA reviewed DG Flugzeugbau GmbH Technical Note No. 800/46,
Doc. No. TM800-46 FE-29-01 (English version), Issue 01.a, dated March
7, 2018, for Model DG-808C gliders; and Technical Note No. 1000/38,
Doc. No. TM1000-38 FE-29-01 (English version), Issue 01.a, dated
February 15, 2018, for Model DG-1000T gliders. The service information,
as applicable to the appropriate model glider, specifies inspections of
the PU fuel hoses, replacement of the PU fuel hoses if damage is found
during an inspection, and actions to take when the hoses have reached
their life limit. 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.
Differences Between This AD and the MCAI
The MCAI requires replacing any damaged fuel hoses before next
engine operation, while this AD requires replacing damaged fuel hoses
before further flight. Even though use of the engine is optional and
the glider can operate without the engine, the glider has other
electronic equipment installed that could cause arcing and result in an
in-flight fire if there is a fuel leak.
Costs of Compliance
The FAA estimates that this AD affects 10 gliders of U.S. registry.
The FAA also estimates that inspecting the fuel hoses will take about
work-hours. 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 $1,700, or $170 per glider, each inspection cycle.
In addition, the FAA estimates that each replacement required by
this AD would take about 8 work-hours and require parts costing $500.
Based on these figures, the FAA estimates the replacement cost of this
AD to be $1,180 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.
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
(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
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