AD 73-17-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Slingsby Aviation Ltd. | Dart T.51 | Airworthiness Directives; Slingsby Model T.51 Dart Gliders |
| aircraft | Slingsby Aviation Ltd. | Dart T.51/17 | Airworthiness Directives; Slingsby Model T.51 Dart Gliders |
| aircraft | Slingsby Aviation Ltd. | Dart T.51/17R | Airworthiness Directives; Slingsby Model T.51 Dart Gliders |
Unsafe Condition
Corrosion of the metal portion of the wing spars, particularly at bolted joints and rib attachment areas, which could lead to loss of wing structural integrity.
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Required Actions
Cut seven inspection holes in the lower surface skin of each wing per Slingsby Technical Instruction No. 58, Issue 1, dated May 1973. Visually inspect the metal spars for corrosion, measure corrosion depth exceeding 0.007 inches, repair or replace corroded parts before further flight, and close inspection holes. Notify the FAA in writing within 10 days of inspection results.
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Compliance Time
Before July 14, 1973, unless already accomplished within the last year, and thereafter at intervals not to exceed one year since the last inspection.
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Affected Aircraft
Slingsby Aviation Ltd. Model T.51 Dart Gliders with metal reinforced wing spars.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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