AD 2007-21-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; DG Flugzeugbau GmbH Model DG-500 Elan Series, DG-500M, and DG-500MB Gliders |
Unsafe Condition
The bolt of bearing stand 5RU61, which is the pivot for bell crank 5St19, failed in-flight, leading to loss of control of the aircraft. The most likely cause is suspected to be insufficient tightening of the nut on the bolt of bearing stand 5RU61.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the torque on the nut of bearing stand 5RU61. Replace any bolts where the torque is found to be insufficient. Introduce a life limit for the affected bolts. Replace any bolts that have already exceeded this limit in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
DG Flugzeugbau GmbH Model DG-500 Elan Series, DG-500M, and DG-500MB gliders, all serial numbers, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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