AD 56-22-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Helio Aircraft LLC | H-391B | Airworthiness Directives; Helio Model H-391B Aircraft |
Unsafe Condition
Cracked upper wing attachment thrust washers, P/N HS-15, installed beneath the head of the bolt attaching the top of the front wing spar to the carry-through structure.
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Required Actions
Replace cracked upper wing attachment thrust washers P/N HS-15 with new improved type procured from the airplane manufacturer. Follow torque requirements specified in Helio Field Service Bulletin No. 13 dated July 18, 1956.
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Compliance Time
within next 100 hours
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Affected Aircraft
Helio Aircraft LLC Model H-391B Aircraft, Serial Numbers 003 to 029 Inclusive.
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Federal Register Abstract
Wing Attachment Washers
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_56-22-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 56-22-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Helio Model H-391B Aircraft Subject: Wing Attachment Washers Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Helio Aircraft LLC Model: H-391B Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 56-22-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 56-22-02 SUBJECT HEADING: Airworthiness Directives; Helio Model H-391B Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 56-22-02 HELIO: Applies to Model H-391B Aircraft, Serial Numbers 003 to 029 Inclusive. Compliance required within next 100 hours. Cases have been reported of finding cracked upper wing attachment thrust washers, P/N HS-15. These are special heat-treated washers installed beneath the head of the bolt attaching the top of the front wing spar to the carry-through structure. Accordingly, these washers must be replaced with new improved type procured from the airplane manufacturer. (Helio Field Service Bulletin No. 13 dated July 18, 1956, covers this same subject and specifies the bolt torque requirements.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_56-22-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 56-22-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Helio Model H-391B Aircraft Subject: Wing Attachment Washers Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Helio Aircraft LLC Model: H-391B 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: 56-22-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 56-22-02 SUBJECT HEADING: Airworthiness Directives; Helio Model H-391B Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 56-22-02 HELIO: Applies to Model H-391B Aircraft, Serial Numbers 003 to 029 Inclusive. Compliance required within next 100 hours. Cases have been reported of finding cracked upper wing attachment thrust washers, P/N HS-15. These are special heat-treated washers installed beneath the head of the bolt attaching the top of the front wing spar to the carry-through structure. Accordingly, these washers must be replaced with new improved type procured from the airplane manufacturer. (Helio Field Service Bulletin No. 13 dated July 18, 1956, covers this same subject and specifies the bolt torque requirements.) 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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