Airworthiness Directives; Schempp-Hirth Flugzeugbau GmbH Gliders, 58228-58230 [2021-22680]

Download as PDF 58228 Federal Register / Vol. 86, No. 201 / Thursday, October 21, 2021 / Proposed Rules DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2021–0878; Project Identifier MCAI–2020–01460–G] Examining the AD Docket RIN 2120–AA64 Airworthiness Directives; SchemppHirth Flugzeugbau GmbH Gliders Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: The FAA proposes to adopt a new airworthiness directive (AD) for certain Schempp-Hirth Flugzeugbau GmbH Model Duo Discus and Duo Discus T gliders. This proposed 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 describes the unsafe condition as jerky extension of the air brakes at very high air speeds, including cases where the air brake blades interlock. This proposed AD would require replacing certain air brake end stop bushings, inspecting certain other air brake end stops, and repairing if necessary. 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 December 6, 2021. SUMMARY: You may send comments, using the procedures found in 14 CFR 11.43 and 11.45, by any of the following methods: • Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments. • Fax: (202) 493–2251. • 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 service information identified in this NPRM, contact Schempp-Hirth Flugzeugbau GmbH, Krebenstrasse 25, 73230 Kirchheim/Teck, Germany; phone: +49 7021 7298–0; fax: +49 7021 7298–199; email: info@schempphirth.com; website: https:// www.schempp-hirth.com. You may view this referenced service information at the FAA, Airworthiness Products jspears on DSK121TN23PROD with PROPOSALS1 ADDRESSES: VerDate Sep<11>2014 16:54 Oct 20, 2021 Jkt 256001 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. You may examine the AD docket at https://www.regulations.gov by searching for and locating Docket No. FAA–2021–0878; 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 MCAI, any comments received, and other information. The street address for Docket Operations is listed above. 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: Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES. Include ‘‘Docket No. FAA–2021–0878; Project Identifier MCAI–2020–01460–G’’ at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend this proposal because of those comments. Except for Confidential Business Information (CBI) 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 agency will also post a report summarizing each substantive verbal contact received about this NPRM. 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 PO 00000 Frm 00003 Fmt 4702 Sfmt 4702 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 Jim Rutherford, Aviation Safety Engineer, FAA, General Aviation & Rotorcraft Section, International Validation Branch, FAA, 901 Locust, Room 301, Kansas City, MO 64106. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking. Background The European Union Aviation Safety Agency (EASA), which is the Technical Agent for the Member States of the European Union, has issued EASA AD 2020–0233, dated October 27, 2020 (referred to after this as ‘‘the MCAI’’), to address an unsafe condition on certain serial-numbered (S/N) Schempp-Hirth Flugzeugbau GmbH Model Duo Discus, Duo Discus C, and Duo Discus T gliders. The MCAI states: Occurrences were reported of experiencing jerky extension of the airbrakes at very high air speeds, in some cases of which the airbrake blades interlocked. An increasing number of age-related damage was observed on a specific version (22 mm plastic bushes) of the airbrake end-stops. This condition, if not corrected, could lead to blockage of the airbrakes, possibly resulting in reduced control of the (powered) sailplane. To address this potential unsafe condition, Schempp-Hirth issued the applicable [technical note] TN (original issue) to provide instructions to replace the affected parts with a new version bushing, made of better material. Since [EASA planned AD] PAD 20–119 was issued, it was discovered that early s/n sailplanes were equipped with a single metal end stop per airbrake. The applicable TN was revised accordingly. The PAD was revised to include those metal end stops in the definition of ‘affected part’ to ensure these are inspected. For the reasons described above, this [EASA] AD requires replacement of certain affected parts with serviceable parts. For other affected parts, this [EASA] AD requires a one-time inspection for sufficient overlap and, depending on findings, accomplishment of applicable corrective action(s). This [EASA] AD also prohibits (re)installation of affected parts. You may examine the MCAI in the AD docket at https:// www.regulations.gov by searching for and locating Docket No. FAA–2021– 0878. E:\FR\FM\21OCP1.SGM 21OCP1 Federal Register / Vol. 86, No. 201 / Thursday, October 21, 2021 / Proposed Rules Related Service Information Under 1 CFR Part 51 The FAA reviewed Schempp-Hirth Flugzeugbau GmbH Working Instructions for Technical Note 890–16 rev1 and Technical Note 396–20 rev1 action 1, dated September 18, 2020. The service information contains procedures for replacing each air brake end stop plastic bushing (22 mm) with an air brake end stop plastic bushing (32 mm). The FAA also reviewed Schempp-Hirth Flugzeugbau GmbH Working Instructions for Technical Note 396–20 rev1 action 2, dated September 18, 2020. The service information contains procedures for inspecting each single air brake metal end stop for overlap. 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. FAA’s Determination 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 is issuing this NPRM after determining the unsafe condition described previously is likely to exist or develop on other products of the same type design. Proposed AD Requirements This proposed AD would require accomplishing the actions specified in the service information already described, except as described under ‘‘Differences Between this Proposed AD and the MCAI.’’ This proposed AD would also require repairing any single air brake metal end stop with insufficient overlap. Differences Between This Proposed AD and the MCAI The MCAI applies to Schempp-Hirth Flugzeugbau GmbH Model Duo Discus 58229 C gliders, and this proposed AD would not because this model does not have an FAA type certificate. The MCAI allows credit for modifications done prior to the effective date of the EASA AD in accordance with the original issue of SchemppHirth TN 396–20/TN 890–16, but this proposed AD would not provide such credit. The MCAI prohibits installation of air brake end stop plastic bushings (22 mm) after a glider has been modified with an air brake end stop plastic bushing (32 mm). This proposed AD would prohibit installation of air brake end stop plastic bushings (22 mm) as of the effective date of this AD. Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 27 gliders of U.S. registry. The FAA estimates the following costs to comply with this proposed AD: ESTIMATED COSTS Action Labor cost Replace plastic end stop bushings 4 work-hours × $85 per hour = $340. Inspect metal end stops ................. 1 work-hour × $85 per hour = $85 The FAA estimates the following costs to do any necessary repairs that Cost per product Parts cost Cost on U.S. operators $150 $490 0 85 would be required based on the results of the proposed inspection. The FAA Up to $13,230 (depending on number of gliders with plastic end stop bushings). Up to $2,295 (depending on number of gliders with metal end stops). has no way of determining the number of gliders that might need these repairs: ON-CONDITION COSTS Action Labor cost Parts cost Cost per product Repair metal end stops ................................................ 4 work-hours × $85 per hour = $340 ........................... $150 $490 jspears on DSK121TN23PROD with PROPOSALS1 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 VerDate Sep<11>2014 16:54 Oct 20, 2021 Jkt 256001 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 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 PO 00000 Frm 00004 Fmt 4702 Sfmt 4702 responsibilities among the various levels of government. For the reasons discussed above, I certify this proposed regulation: (1) Is not a ‘‘significant regulatory action’’ under Executive Order 12866, (2) Would not affect intrastate aviation in Alaska, and (3) Would 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. E:\FR\FM\21OCP1.SGM 21OCP1 58230 Federal Register / Vol. 86, No. 201 / Thursday, October 21, 2021 / Proposed Rules 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. (2) For gliders with single air brake metal end stops installed: Within 3 months after the effective date of this AD, inspect each single air brake metal end stop for overlap in accordance with Schempp-Hirth Flugzeugbau GmbH Working Instructions for Technical Note 396–20 rev1 action 2, dated September 18, 2020. If there is insufficient overlap, before further flight, repair using a method approved by the FAA or the European Union Aviation Safety Agency (EASA). (h) Parts Installation Prohibition § 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new airworthiness directive: ■ Schempp-Hirth Flugzeugbau GmbH: Docket No. FAA–2021–0878; Project Identifier MCAI–2020–01460–G. (a) Comments Due Date The FAA must receive comments on this airworthiness directive (AD) by December 6, 2021. (b) Affected ADs None. (c) Applicability This AD applies to the Schempp-Hirth Flugzeugbau GmbH gliders identified in paragraphs (c)(1) and (2) of this AD, certificated in any category. (1) Model Duo Discus gliders, serial number (S/N) 1 through 541 inclusive, except S/N 534. (2) Model Duo Discus T gliders, S/N 1 through 174 inclusive. (d) Subject Joint Aircraft System Component (JASC) Code 2760, Drag Control System. (e) Unsafe Condition 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 describes the unsafe condition as jerky extension of the air brakes at very high air speeds, including cases where the air brake blades interlock. The FAA is issuing this AD to prevent and correct damage of the airbrake end-stops. The unsafe condition, if not addressed, could result in blockage of the air brakes and reduced control of the glider. jspears on DSK121TN23PROD with PROPOSALS1 (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Actions (1) For gliders with air brake end stop plastic bushings (22 mm) installed: Within 3 months after the effective date of this AD, replace each air brake end stop plastic bushing (22 mm) with an air brake end stop plastic bushing (32 mm) in accordance with Schempp-Hirth Flugzeugbau GmbH Working Instructions for Technical Note 890–16 rev1 and Technical Note 396–20 rev1 action 1, dated September 18, 2020. VerDate Sep<11>2014 16:54 Oct 20, 2021 Jkt 256001 As of the effective date of this AD, do not install an air brake end stop plastic bushing (22 mm) on any glider. (i) 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 International Validation Branch, send it to the attention of the person identified in paragraph (j)(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. (j) 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 EASA AD 2020–0233, dated October 27, 2020, for more information. You may examine the EASA AD in the AD docket at https://www.regulations.gov by searching for and locating it in Docket No. FAA–2021– 0878. (3) For service information identified in this AD, contact Schempp-Hirth Flugzeugbau GmbH, Krebenstrasse 25, 73230 Kirchheim/ Teck, Germany; phone: +49 7021 7298–0; fax: +49 7021 7298–199; email: info@schempphirth.com; website: https://www.schempphirth.com. You may view this referenced 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. Issued on October 8, 2021. Gaetano A. Sciortino, Deputy Director for Strategic Initiatives, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2021–22680 Filed 10–20–21; 8:45 am] BILLING CODE 4910–13–P PO 00000 Frm 00005 Fmt 4702 Sfmt 4702 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 71 [Docket No. FAA–2021–0818; Airspace Docket No. 19–AAL–35] RIN 2120–AA66 Proposed Establishment of United States Area Navigation (RNAV) Route T–366; Point Hope, AK Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: This action proposes to establish United States Area Navigation (RNAV) route T–366 in the vicinity of Point Hope, AK in support of a large and comprehensive T-route modernization project for the state of Alaska. SUMMARY: Comments must be received on or before December 6, 2021. ADDRESSES: Send comments on this proposal to the U.S. Department of Transportation, Docket Operations, 1200 New Jersey Avenue SE, West Building Ground Floor, Room W12–140, Washington, DC 20590; telephone: 1(800) 647–5527, or (202) 366–9826. You must identify FAA Docket No. FAA–2021–0818; Airspace Docket No. 19–AAL–35 at the beginning of your comments. You may also submit comments through the internet at https://www.regulations.gov. FAA Order JO 7400.11F, Airspace Designations and Reporting Points, and subsequent amendments can be viewed online at https://www.faa.gov/air_ traffic/publications/. For further information, you can contact the Rules and Regulations Group, Federal Aviation Administration, 800 Independence Avenue SW, Washington, DC, 20591; telephone: (202) 267–8783. FAA Order JO 7400.11F is also available for inspection at the National Archives and Records Administration (NARA). For information on the availability of FAA Order JO 7400.11F at NARA, email: fr.inspection@nara.gov or go to https://www.archives.gov/federalregister/cfr/ibr-locations.html. FOR FURTHER INFORMATION CONTACT: Christopher McMullin, Rules and Regulations Group, Office of Policy, Federal Aviation Administration, 800 Independence Avenue SW, Washington, DC 20591; telephone: (202) 267–8783. SUPPLEMENTARY INFORMATION: DATES: E:\FR\FM\21OCP1.SGM 21OCP1

Agencies

[Federal Register Volume 86, Number 201 (Thursday, October 21, 2021)]
[Proposed Rules]
[Pages 58228-58230]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-22680]



[[Page 58228]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0878; Project Identifier MCAI-2020-01460-G]
RIN 2120-AA64


Airworthiness Directives; Schempp-Hirth Flugzeugbau GmbH Gliders

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for certain Schempp-Hirth Flugzeugbau GmbH Model Duo Discus and Duo 
Discus T gliders. This proposed 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 describes the unsafe condition as jerky 
extension of the air brakes at very high air speeds, including cases 
where the air brake blades interlock. This proposed AD would require 
replacing certain air brake end stop bushings, inspecting certain other 
air brake end stops, and repairing if necessary. 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 December 6, 
2021.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, by any of the following methods:
     Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments.
     Fax: (202) 493-2251.
     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 service information identified in this NPRM, contact Schempp-
Hirth Flugzeugbau GmbH, Krebenstrasse 25, 73230 Kirchheim/Teck, 
Germany; phone: +49 7021 7298-0; fax: +49 7021 7298-199; email: 
hirth.com">[email protected]hirth.com; website: https://www.schempp-hirth.com. You may 
view this referenced 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.

Examining the AD Docket

    You may examine the AD docket at https://www.regulations.gov by 
searching for and locating Docket No. FAA-2021-0878; 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 MCAI, 
any comments received, and other information. The street address for 
Docket Operations is listed above.

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: 
[email protected].

SUPPLEMENTARY INFORMATION:

Comments Invited

    The FAA invites you to send any written relevant data, views, or 
arguments about this proposal. Send your comments to an address listed 
under ADDRESSES. Include ``Docket No. FAA-2021-0878; Project Identifier 
MCAI-2020-01460-G'' at the beginning of your comments. The most helpful 
comments reference a specific portion of the proposal, explain the 
reason for any recommended change, and include supporting data. The FAA 
will consider all comments received by the closing date and may amend 
this proposal because of those comments.
    Except for Confidential Business Information (CBI) 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 agency will also post a report summarizing each 
substantive verbal contact received about this NPRM.

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 Jim 
Rutherford, Aviation Safety Engineer, FAA, General Aviation & 
Rotorcraft Section, International Validation Branch, FAA, 901 Locust, 
Room 301, Kansas City, MO 64106. Any commentary that the FAA receives 
which is not specifically designated as CBI will be placed in the 
public docket for this rulemaking.

Background

    The European Union Aviation Safety Agency (EASA), which is the 
Technical Agent for the Member States of the European Union, has issued 
EASA AD 2020-0233, dated October 27, 2020 (referred to after this as 
``the MCAI''), to address an unsafe condition on certain serial-
numbered (S/N) Schempp-Hirth Flugzeugbau GmbH Model Duo Discus, Duo 
Discus C, and Duo Discus T gliders. The MCAI states:

    Occurrences were reported of experiencing jerky extension of the 
airbrakes at very high air speeds, in some cases of which the 
airbrake blades interlocked. An increasing number of age-related 
damage was observed on a specific version (22 mm plastic bushes) of 
the airbrake end-stops.
    This condition, if not corrected, could lead to blockage of the 
airbrakes, possibly resulting in reduced control of the (powered) 
sailplane.
    To address this potential unsafe condition, Schempp-Hirth issued 
the applicable [technical note] TN (original issue) to provide 
instructions to replace the affected parts with a new version 
bushing, made of better material.
    Since [EASA planned AD] PAD 20-119 was issued, it was discovered 
that early s/n sailplanes were equipped with a single metal end stop 
per airbrake. The applicable TN was revised accordingly. The PAD was 
revised to include those metal end stops in the definition of 
`affected part' to ensure these are inspected.
    For the reasons described above, this [EASA] AD requires 
replacement of certain affected parts with serviceable parts. For 
other affected parts, this [EASA] AD requires a one-time inspection 
for sufficient overlap and, depending on findings, accomplishment of 
applicable corrective action(s). This [EASA] AD also prohibits 
(re)installation of affected parts.

    You may examine the MCAI in the AD docket at https://www.regulations.gov by searching for and locating Docket No. FAA-2021-
0878.

[[Page 58229]]

Related Service Information Under 1 CFR Part 51

    The FAA reviewed Schempp-Hirth Flugzeugbau GmbH Working 
Instructions for Technical Note 890-16 rev1 and Technical Note 396-20 
rev1 action 1, dated September 18, 2020. The service information 
contains procedures for replacing each air brake end stop plastic 
bushing (22 mm) with an air brake end stop plastic bushing (32 mm). The 
FAA also reviewed Schempp-Hirth Flugzeugbau GmbH Working Instructions 
for Technical Note 396-20 rev1 action 2, dated September 18, 2020. The 
service information contains procedures for inspecting each single air 
brake metal end stop for overlap. 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.

FAA's Determination

    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 is issuing this NPRM 
after determining the unsafe condition described previously is likely 
to exist or develop on other products of the same type design.

Proposed AD Requirements

    This proposed AD would require accomplishing the actions specified 
in the service information already described, except as described under 
``Differences Between this Proposed AD and the MCAI.'' This proposed AD 
would also require repairing any single air brake metal end stop with 
insufficient overlap.

Differences Between This Proposed AD and the MCAI

    The MCAI applies to Schempp-Hirth Flugzeugbau GmbH Model Duo Discus 
C gliders, and this proposed AD would not because this model does not 
have an FAA type certificate.
    The MCAI allows credit for modifications done prior to the 
effective date of the EASA AD in accordance with the original issue of 
Schempp-Hirth TN 396-20/TN 890-16, but this proposed AD would not 
provide such credit.
    The MCAI prohibits installation of air brake end stop plastic 
bushings (22 mm) after a glider has been modified with an air brake end 
stop plastic bushing (32 mm). This proposed AD would prohibit 
installation of air brake end stop plastic bushings (22 mm) as of the 
effective date of this AD.

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 27 gliders of U.S. registry.
    The FAA estimates the following costs to comply with this proposed 
AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                              Cost per          Cost on U.S.
              Action                      Labor cost         Parts cost        product           operators
----------------------------------------------------------------------------------------------------------------
Replace plastic end stop bushings.  4 work-hours x $85               $150            $490  Up to $13,230
                                     per hour = $340.                                       (depending on number
                                                                                            of gliders with
                                                                                            plastic end stop
                                                                                            bushings).
Inspect metal end stops...........  1 work-hour x $85 per               0              85  Up to $2,295
                                     hour = $85.                                            (depending on number
                                                                                            of gliders with
                                                                                            metal end stops).
----------------------------------------------------------------------------------------------------------------

    The FAA estimates the following costs to do any necessary repairs 
that would be required based on the results of the proposed inspection. 
The FAA has no way of determining the number of gliders that might need 
these repairs:

                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                     Cost per
                    Action                                Labor cost               Parts cost        product
----------------------------------------------------------------------------------------------------------------
Repair metal end stops.......................  4 work-hours x $85 per hour =              $150             $490
                                                $340.
----------------------------------------------------------------------------------------------------------------

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 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 
regulation:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Would not affect intrastate aviation in Alaska, and
    (3) Would 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.

[[Page 58230]]

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

0
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]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive:

Schempp-Hirth Flugzeugbau GmbH: Docket No. FAA-2021-0878; Project 
Identifier MCAI-2020-01460-G.

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by December 6, 2021.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to the Schempp-Hirth Flugzeugbau GmbH gliders 
identified in paragraphs (c)(1) and (2) of this AD, certificated in 
any category.
    (1) Model Duo Discus gliders, serial number (S/N) 1 through 541 
inclusive, except S/N 534.
    (2) Model Duo Discus T gliders, S/N 1 through 174 inclusive.

(d) Subject

    Joint Aircraft System Component (JASC) Code 2760, Drag Control 
System.

(e) Unsafe Condition

    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 describes the unsafe condition as jerky extension 
of the air brakes at very high air speeds, including cases where the 
air brake blades interlock. The FAA is issuing this AD to prevent 
and correct damage of the airbrake end-stops. The unsafe condition, 
if not addressed, could result in blockage of the air brakes and 
reduced control of the glider.

(f) Compliance

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

(g) Required Actions

    (1) For gliders with air brake end stop plastic bushings (22 mm) 
installed: Within 3 months after the effective date of this AD, 
replace each air brake end stop plastic bushing (22 mm) with an air 
brake end stop plastic bushing (32 mm) in accordance with Schempp-
Hirth Flugzeugbau GmbH Working Instructions for Technical Note 890-
16 rev1 and Technical Note 396-20 rev1 action 1, dated September 18, 
2020.
    (2) For gliders with single air brake metal end stops installed: 
Within 3 months after the effective date of this AD, inspect each 
single air brake metal end stop for overlap in accordance with 
Schempp-Hirth Flugzeugbau GmbH Working Instructions for Technical 
Note 396-20 rev1 action 2, dated September 18, 2020. If there is 
insufficient overlap, before further flight, repair using a method 
approved by the FAA or the European Union Aviation Safety Agency 
(EASA).

(h) Parts Installation Prohibition

    As of the effective date of this AD, do not install an air brake 
end stop plastic bushing (22 mm) on any glider.

(i) 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 International Validation Branch, send 
it to the attention of the person identified in paragraph (j)(1) of 
this AD or email: [email protected].
    (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.

(j) 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: 
[email protected].
    (2) Refer to EASA AD 2020-0233, dated October 27, 2020, for more 
information. You may examine the EASA AD in the AD docket at https://www.regulations.gov by searching for and locating it in Docket No. 
FAA-2021-0878.
    (3) For service information identified in this AD, contact 
Schempp-Hirth Flugzeugbau GmbH, Krebenstrasse 25, 73230 Kirchheim/
Teck, Germany; phone: +49 7021 7298-0; fax: +49 7021 7298-199; 
email: hirth.com">[email protected]hirth.com; website: https://www.schempp-
hirth.com. You may view this referenced 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.

    Issued on October 8, 2021.
Gaetano A. Sciortino,
Deputy Director for Strategic Initiatives, Compliance & Airworthiness 
Division, Aircraft Certification Service.
[FR Doc. 2021-22680 Filed 10-20-21; 8:45 am]
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