AD 58-25-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Helio Aircraft LLC | H-391B | Airworthiness Directives; Helio Models H-391B and H-395 Aircraft |
| aircraft | Helio Aircraft LLC | H-395 (USAF L-28A or U-10B) | Airworthiness Directives; Helio Models H-391B and H-395 Aircraft |
Unsafe Condition
Failure of the fin upper hinge attachment has been reported.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the fin top hinge and attachment details. Cracked parts must be replaced; uncracked parts may be reinstalled. New reinforcement gussets (P/N 391-022-001-16) must be installed.
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Compliance Time
not later than next 100 hours operation or March 31, 1959, whichever occurs first
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Affected Aircraft
Helio Aircraft LLC Models H-391B and H-395 (USAF L-28A or U-10B) incorporating three fin hinge attachments.
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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