AD 91-15-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Schempp-Hirth Flugzeugbau | Cirrus | Airworthiness Directives; SCHEMPP-HIRTH Models Cirrus and Cirrus VTC Sailplanes |
Unsafe Condition
Tail flutter that could result in complete loss of control of the sailplane.
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Required Actions
Replace the 8mm diameter drive tube on the elevator drive lever with a round bar per drawing Cirrus No. 30.011/1. Determine elevator hinge moments and weights using service manual criteria. If moments/weights exceed criteria, remove tail parachute and perform Action 3 a) through d), and install a mass balance on the elevator per drawing Cirrus No. 30.001/1.
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Compliance Time
within the next 30 calendar days after the effective date of this AD, unless already accomplished
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Affected Aircraft
Schempp-Hirth Flugzeugbau Cirrus and Cirrus VTC sailplanes (serial numbers 1 through 183, with or without a Y suffix)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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