AD 98-12-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | DG Flugzeugbau GmbH | DG-500M | Airworthiness Directives; Glaser-Dirks Flugzeugbau GmbH Model DG-500M Gliders |
Unsafe Condition
Rudder vibrations caused by flow separation at the rudder gap, which could result in flutter with consequent loss of rudder control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a rudder gap seal in accordance with the maintenance manual referenced in Glaser-Dirks TN No. 843/5, and modify the cooling liquid reservoir mount per Glaser-Dirks Working Instruction No. 1 for TN 843/5.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 3 calendar months after the effective date of this AD, unless already accomplished
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Affected Aircraft
Glaser-Dirks Flugzeugbau GmbH Model DG-500M gliders, all serial numbers
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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