# Proposed AD FAA-2021-0944: Fiberglas-Technik Rudolf Lindner GmbH & Co. KG (Type Certificate Previously Held by GROB Aircraft AG, Grob Aerospace GmbH i.l., Grob Aerospace GmbH, Burkhart Grob Luft-und Raumfahrt GmbH & Co. KG) Gliders

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-03-08
- Products: Fiberglas-Technik Rudolf Lindner
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 29, 2021, 86 FR 59903
- Comments due: December 13, 2021
- Became: [AD 2022-03-08](https://openairdocs.org/ad/2022-03-08)
- Docket: FAA-2021-0944 (https://www.regulations.gov/docket/FAA-2021-0944, where comments are filed)
- Project: MCAI-2020-00800-G
- FR document: 2021-23325
- Official PDF: https://openairdocs.org/files/sha256/86/aa/86aa9e8333ccc7ac9bdb1c03696bdc7a85aa83856d13aa44ef5e246d9f4428bd (from https://www.govinfo.gov/content/pkg/FR-2021-10-29/pdf/2021-23325.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/10/29/2021-23325/airworthiness-directives-fiberglas-technik-rudolf-lindner-gmbh-and-co-kg-type-certificate-previously
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2021-23325-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0944

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Fiberglas-Technik Rudolf Lindner GmbH & Co. KG (type certificate previously held by GROB Aircraft AG, Grob Aerospace GmbH i.l., Grob Aerospace GmbH, Burkhart Grob Luft-und Raumfahrt GmbH & Co. KG) Model G102 ASTIR CS, G103 TWIN ASTIR, G103 TWIN II, G103A TWIN II ACRO, G103C TWIN III ACRO, and G 103 C TWIN III SL gliders. This proposed 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 corrosion on the elevator control pushrod. This proposed AD would require inspecting the elevator control pushrod for water and corrosion and replacing the pushrod if necessary. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Oct 29, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-23325, comments due Dec 13, 2021 (https://www.federalregister.gov/documents/2021/10/29/2021-23325/airworthiness-directives-fiberglas-technik-rudolf-lindner-gmbh-and-co-kg-type-certificate-previously)

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