AD 2007-25-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Aircraft Industries, a.s. (Type Certificate No. G24EU Formerly Held by LETECKÉ ZÁVODY a.s. and LET Aeronautical Works) Model L-13 Blanik Gliders |
Unsafe Condition
Cracks on L-13 Blanik sailplanes in zones where the forward and aft control sticks are attached to the connecting rod, designated as 'control bridge'. If left uncorrected, cracks could propagate and lead to failure of the connecting rod with subsequent loss of control of the sailplane.
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Required Actions
Inspect the control bridge for cracks using a 10X magnifier and dye penetrant inspection. If cracks are found, install a new control bridge (part numbers A740 370 N or A401 001N) before further flight. Update the aircraft Maintenance Manual to incorporate repetitive inspections of the control bridge.
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Compliance Time
Within 3 months after January 7, 2008, and repetitively thereafter at intervals not to exceed 12 months.
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Affected Aircraft
Aircraft Industries, a.s. Model L-13 Blanik gliders, 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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