# Airworthiness Directives; Alexander Schleicher Segelflugzeugbau Model ASK 21 Sailplanes
> **Rule** · Final rule. · Published 1998-04-28 · Effective 1998-06-14 · 63 FR 23201
## Document
- **Document number:** 98-11006
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 23201
- **Publication date:** 1998-04-28
- **Effective date:** 1998-06-14
- **FAA docket:** Docket No. 97-CE-104-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that applies to certain Alexander Schleicher Segelflugzeugbau (Alexander Schleicher) Model ASK 21 sailplanes. This AD requires inspecting the S- shaped rudder pedal tube for displacement, and correcting any displacement of the plastic tube. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified by this AD are intended to prevent rudder control jamming, which could result in loss of directional control of the sailplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/04/28/98-11006/airworthiness-directives-alexander-schleicher-segelflugzeugbau-model-ask-21-sailplanes)
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