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.
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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.
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Federal Register Abstract
Fin Hinge Attachment
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_58-25-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 58-25-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Helio Models H-391B and H-395 Aircraft Subject: Fin Hinge Attachment Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Helio Aircraft LLC Model: H-391B | H-395 (USAF L-28A or U-10B) Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 58-25-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 58-25-04 SUBJECT HEADING: Airworthiness Directives; Helio Models H-391B and H-395 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 58-25-04 HELIO: Applies to Models H-391B and H-395 Aircraft Incorporating Three Fin Hinge Attachments. Compliance required not later than next 100 hours operation or March 31, 1959, whichever occurs first. Failure of the fin upper hinge attachment has been reported. Accordingly, the following inspection and replacement programs are required: Inspect the fin top hinge and attachment details. Cracked parts must be replaced; uncracked parts may be reinstalled. In any case, new reinforcement gussets (P/N 391-022-001-16) must be installed. (Helio Service Bulletin No. 18 covers this subject.) FOOTER:
Document Text
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AD Final Rules - DRS_58-25-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 58-25-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Helio Models H-391B and H-395 Aircraft Subject: Fin Hinge Attachment Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Helio Aircraft LLC Model: H-391B | H-395 (USAF L-28A or U-10B) Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 58-25-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 58-25-04 SUBJECT HEADING: Airworthiness Directives; Helio Models H-391B and H-395 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 58-25-04 HELIO: Applies to Models H-391B and H-395 Aircraft Incorporating Three Fin Hinge Attachments. Compliance required not later than next 100 hours operation or March 31, 1959, whichever occurs first. Failure of the fin upper hinge attachment has been reported. Accordingly, the following inspection and replacement programs are required: Inspect the fin top hinge and attachment details. Cracked parts must be replaced; uncracked parts may be reinstalled. In any case, new reinforcement gussets (P/N 391-022-001-16) must be installed. (Helio Service Bulletin No. 18 covers this subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
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