AD 2014-07-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Ballonbau Wörner GmbH Balloons |
Unsafe Condition
Current inspection intervals are no longer adequate to ensure timely detection of deterioration or damage, which could affect the structural integrity of the balloon.
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Required Actions
Complete all inspections and maintenance tasks described in the Ballonbau Wörner GmbH Instructions for Continued Airworthiness, Gas Balloon Model NL-STU, Issue 1, pages 44 through 53 and 55 through 69, dated November 2013, and page 54 dated December 2013. Repair any discrepancies found during the inspection. Conduct the porosity test if the balloon has already exceeded the threshold compliance time for the porosity test. After May 27, 2014, follow Technische Mitteilung Ballonbau Wörner GmbH EASA.BA.009-6 and the updated Instructions for Continued Airworthiness.
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Compliance Time
Before further flight after May 27, 2014, except for the porosity test, which must be conducted within 3 months after May 27, 2014, if applicable.
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Affected Aircraft
Ballonbau Wörner GmbH Models NL-280/STU, NL-380/STU, NL-510/STU, NL-640/STU, NL-840/STU, and NL-1000/STU balloons, all serial numbers, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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