# Proposed AD 97-CE-102-AD: Alexander Schleicher Segelflugzeugbau Models ASW-19 and ASK-21 Sailplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-12-03
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 17, 1998, 63 FR 13013
- Comments due: April 17, 1998
- Became: [AD 98-12-03](https://openairdocs.org/ad/98-12-03)
- Docket: 97-CE-102-AD
- FR document: 98-6768
- Official PDF: https://openairdocs.org/files/sha256/1c/c1/1cc19b25b93c3d8b096aacb4b954e6e7eea0bee5f95b8a7d81355ab470b23c20 (from https://www.govinfo.gov/content/pkg/FR-1998-03-17/pdf/98-6768.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/03/17/98-6768/airworthiness-directives-alexander-schleicher-segelflugzeugbau-models-asw-19-and-ask-21-sailplanes
- Page: https://openairdocs.org/proposed/97-CE-102-AD

## Summary

This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Alexander Schleicher Segelflugzeugbau (Schleicher) Models ASW-19 and ASK-21 sailplanes. The proposed AD would require: modifying the rudder surface panels; replacing the airbrake bellcrank; and modifying the rear canopy hinge structure. The proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified by the proposed AD are intended to prevent loss of the canopy caused by design deficiency, airbrake failure caused by cracking, and rudder panel flutter caused by high density altitude conditions, all of which, if not corrected, could result in reduced sailplane controllability.

## Notices in this docket

- Mar 17, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-6768, comments due Apr 17, 1998 (https://www.federalregister.gov/documents/1998/03/17/98-6768/airworthiness-directives-alexander-schleicher-segelflugzeugbau-models-asw-19-and-ask-21-sailplanes)

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