# Proposed AD 98-CE-09-AD: Glaser-Dirks Flugzeugbau GmbH Model DG- 500M Gliders

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-12-04
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 20, 1998, 63 FR 13581
- Comments due: April 17, 1998
- Became: [AD 98-12-04](https://openairdocs.org/ad/98-12-04)
- Docket: 98-CE-09-AD
- FR document: 98-7250
- Official PDF: https://openairdocs.org/files/sha256/7e/ae/7eaefbe211fdddabd8f77387ee9ac2cb4faa529d08ca4fac62ffd27605f3e486 (from https://www.govinfo.gov/content/pkg/FR-1998-03-20/pdf/98-7250.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/03/20/98-7250/airworthiness-directives-glaser-dirks-flugzeugbau-gmbh-model-dg--500m-gliders
- Page: https://openairdocs.org/proposed/98-CE-09-AD

## Summary

This document proposes to adopt a new airworthiness directive (AD) that would apply to Glaser-Dirks Flugzeugbau GmbH (Glaser-Dirks) Model DG-500M gliders. The proposed AD would require installing a rudder gap seal and modifying the cooling liquid reservoir mount. 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 rudder vibrations caused by flow separation at the rudder gap, which could result in flutter with consequent loss of rudder control.

## Notices in this docket

- Mar 20, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-7250, comments due Apr 17, 1998 (https://www.federalregister.gov/documents/1998/03/20/98-7250/airworthiness-directives-glaser-dirks-flugzeugbau-gmbh-model-dg--500m-gliders)

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