# Proposed AD FAA-2021-0878: Schempp-Hirth Flugzeugbau GmbH Gliders

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-26-25
- Products: Schempp-Hirth Flugzeugbau
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 21, 2021, 86 FR 58228
- Comments due: December 6, 2021
- Became: [AD 2021-26-25](https://openairdocs.org/ad/2021-26-25)
- Docket: FAA-2021-0878 (https://www.regulations.gov/docket/FAA-2021-0878, where comments are filed)
- Project: MCAI-2020-01460-G
- FR document: 2021-22680
- Official PDF: https://openairdocs.org/files/sha256/53/16/5316fdcc8d1adc743483381af7e2b2ed2fcc012d680ea2ed3f14ee8e9f057a1d (from https://www.govinfo.gov/content/pkg/FR-2021-10-21/pdf/2021-22680.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/10/21/2021-22680/airworthiness-directives-schempp-hirth-flugzeugbau-gmbh-gliders
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B84A5CE367F3BFDF862587760049A7F5.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0878

## 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.

## Notices in this docket

- Oct 21, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-22680, comments due Dec 6, 2021 (https://www.federalregister.gov/documents/2021/10/21/2021-22680/airworthiness-directives-schempp-hirth-flugzeugbau-gmbh-gliders)

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