AD 73-13-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Slingsby Aviation Ltd. | T.59.D Kestrel | Airworthiness Directives; SLINGSBY Model Glasflugel T.59.D "Kestrel" gliders. |
Unsafe Condition
Possible wing flutter due to aileron unbalance.
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Required Actions
Remove ailerons and measure balance hinge moment per Slingsby Technical Instructions No. 54. If hinge moment exceeds 8.5 lb.-ins average or 9.5 lb.-ins individually, install leading edge balance weights to limit each to ≤8.0 lb.-ins.
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Compliance Time
Within the next 10 hours' time in service after the effective date of this AD, and before further flight if corrective action is required.
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Affected Aircraft
Slingsby Aviation Ltd. Model T.59.D Kestrel gliders, excluding Glasflugel manufactured 'Kestrel' Model gliders.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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