AD 77-15-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BLANIK LIMITED | Blanik L-13 | Airworthiness Directives; LET N.P. Blanik 13 Gliders |
| aircraft | BLANIK LIMITED | Blanik L-13 AC | Airworthiness Directives; LET N.P. Blanik 13 Gliders |
Unsafe Condition
Structural failure of the fin top rib and central stiffener due to cracks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 10 hours time in service after the AD's effective date (or within last 90 hours), inspect fin top rib and central stiffener with 5 power magnifying glass per LET N.P. Mandatory Bulletin L13/040. If cracks <5mm in fin top rib or any length in central stiffener, repair per Bulletin or comply with paragraph (e). If cracks >5mm in fin top rib, comply with paragraph (e). If no cracks found, comply with paragraph (e) within 200 hours. Replace both components per Bulletin's paragraphs C and D when required.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 10 hours time in service after the effective date of this AD, unless already accomplished within the last 90 hours time in service, and thereafter at intervals not to exceed 100 hours time in service from the last inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Blanik Limited Blanik L-13 and L-13 AC gliders with serial numbers 173205 through 174230, inclusive.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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