# Proposed AD 99-CE-89-AD: DG Flugzeugbau GmbH Model DG-500MB Sailplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2001-05-01
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 27, 2000, 65 FR 81782
- Comments due: February 1, 2001
- Became: [AD 2001-05-01](https://openairdocs.org/ad/2001-05-01)
- Docket: 99-CE-89-AD
- FR document: 00-32878
- Official PDF: https://openairdocs.org/files/sha256/f4/c1/f4c12f086cbed9e4772a11b1ca94318175c71080a78130aad312d16552e0023d (from https://www.govinfo.gov/content/pkg/FR-2000-12-27/pdf/00-32878.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/12/27/00-32878/airworthiness-directives-dg-flugzeugbau-gmbh-model-dg-500mb-sailplanes
- Page: https://openairdocs.org/proposed/99-CE-89-AD

## Summary

This document proposes to adopt a new airworthiness directive (AD) that would apply to certain DG Flugzeugbau GmbH (DG Flugzeugbau) Model DG-500MB sailplanes equipped with a SOLO 2625 02 engine. The proposed AD would require you to remove the engine from the propeller mount; install additional access holes in the propeller mount; install the modified engine to the propeller mount; do a ground test run; and replace the digital engine indicator circuit breaker with a new circuit breaker. The proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the Federal Republic of Germany. The actions specified by the proposed AD are intended to correct propeller drive belt tension that could cause damage to the engine crankshaft and to replace an inadequate circuit breaker. This could lead to engine failure and loss of sailplane control.

## Notices in this docket

- Dec 27, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-32878, comments due Feb 1, 2001 (https://www.federalregister.gov/documents/2000/12/27/00-32878/airworthiness-directives-dg-flugzeugbau-gmbh-model-dg-500mb-sailplanes)

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