# Proposed AD FAA-2021-0716: Stemme AG Gliders

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-23-01
- Products: Stemme
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 27, 2021, 86 FR 48065
- Comments due: October 12, 2021
- Became: [AD 2021-23-01](https://openairdocs.org/ad/2021-23-01)
- Docket: FAA-2021-0716 (https://www.regulations.gov/docket/FAA-2021-0716, where comments are filed)
- Project: 2019-CE-023-AD
- FR document: 2021-18387
- Official PDF: https://openairdocs.org/files/sha256/05/6a/056a01811903796a2499f7579b95e39e3c15f5cffc7a952b1acf5f0eb3e35c33 (from https://www.govinfo.gov/content/pkg/FR-2021-08-27/pdf/2021-18387.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/08/27/2021-18387/airworthiness-directives-stemme-ag-gliders
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6B1B7CC6787870EE8625873E006D6F13.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0716

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Stemme AG Model Stemme S 12 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 an airspeed indicator (ASI) with speed markings inconsistent with the approved and published values. This proposed AD would require inspecting the ASI markings and, depending on findings, either replacing the ASI or amending the existing aircraft flight manual (AFM) until the ASI is replaced. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Aug 27, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-18387, comments due Oct 12, 2021 (https://www.federalregister.gov/documents/2021/08/27/2021-18387/airworthiness-directives-stemme-ag-gliders)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.