# Airworthiness Directives; Alexander Schleicher Segelflugzeugbau Model ASK-21 Sailplanes
> **Rule** · Final rule. · Published 1998-03-20 · Effective 1998-04-28 · 63 FR 13507
## Document
- **Document number:** 98-7249
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 13507
- **Publication date:** 1998-03-20
- **Effective date:** 1998-04-28
- **FAA docket:** Docket No. 97-CE-107-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 replacing any tow release cable assembly that does not have a swivel-type end with a cable assembly that does have a swivel-type end. 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 the inability to release the tow rope because of the design of the cable assembly, which could result in loss of control of the sailplane during towing operations.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/03/20/98-7249/airworthiness-directives-alexander-schleicher-segelflugzeugbau-model-ask-21-sailplanes)
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