AD 85-12-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Slingsby Aviation Ltd. | Type T.53.B. | Airworthiness Directives; SLINGSBY SAILPLANES Model T.53.B Gliders |
Unsafe Condition
Structural failure due to fatigue cracks in the welded frame P/N T53B-1079 and aft brackets (P/N T53B-10-168, Issue 1-4 or 5) and metal lugs/channel section on fuselage frame No. 6.
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Required Actions
Install a placard prohibiting cloud flying and aerobatic maneuvers. Visually inspect the welded frame and brackets for cracks using dye penetrant method. Modify tubular structure and replace brackets if cracks are found. Inspect metal lugs and channel section every 100 hours and replace if cracked.
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Compliance Time
Within the next 10 hours time in service after the effective date of this AD, and thereafter at intervals not to exceed 5 or 100 hours time in service from the last inspection.
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Affected Aircraft
Slingsby Aviation Ltd. Model T.53.B gliders certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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