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Federal Register / Vol. 86, No. 187 / Thursday, September 30, 2021 / Rules and Regulations
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
Models DG808C and DG1000T
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 20180127, dated June 11, 2018 referred to after this as the MCAI, to address an unsafe condition on DG Flugzeugbau GmbH Models DG
808C and DG1000T gliders. The MCAI
states:
An occurrence was reported where, during accomplishment of a 10 years inspection on a DG808C 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 serviceable parts.
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. FAA2021
0212.
Discussion of Final Airworthiness Directive
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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 FAAs bilateral agreement with this State of Design Authority, it has notified the
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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 DG Flugzeugbau GmbH Technical Note No. 800/46, Doc.
No. TM80046 FE2901 English version, Issue 01.a, dated March 7, 2018, for Model DG808C gliders; and Technical Note No. 1000/38, Doc. No.
TM100038 FE2901 English version, Issue 01.a, dated February 15, 2018, for Model DG1000T 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 2 work-hours.
The average labor rate is $85 per workhour.
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 FAAs authority to issue
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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 Agencys 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:
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 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

20211814 DG Flugzeugbau GmbH:
Amendment 3921715; Docket No.
FAA20210212; Project Identifier 2018CE032AD.

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