AD 46-06-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Ryan Aeronautical Company | ST-3KR | Airworthiness Directives; Ryan Model ST-3KR Aircraft |
Unsafe Condition
Cracks in the front fin spar at its attachment to the fuselage could lead to structural failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
At each periodic inspection, examine the front fin spar at its attachment to the fuselage for cracks. If cracks are found, repair by cutting the spar approximately 3 1/4 inches above the lower bend and splicing on a 1 1/8 by 0.058 inch X-4130 spar replacement section using 3/16-inch bolts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
at each periodic inspection
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Ryan Model ST-3KR Aircraft, serial numbers 1001 to 2249, inclusive.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Front Fin Spar
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_46-06-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 46-06-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Ryan Model ST-3KR Aircraft Subject: Front Fin Spar Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Ryan Aeronautical Company Model: ST-3KR Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 46-06-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 46-06-01 SUBJECT HEADING: Airworthiness Directives; Ryan Model ST-3KR Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 46-06-01 RYAN: (Was Service Note 5 of AD-749-1.) Applies Only to Model ST-3KR Aircraft Serial Numbers 1001 to 2249, Inclusive. At each periodic inspection examine the front fin spar at its attachment to the fuselage for cracks. If no cracks are found and if spar has been reinforced at the critical section by means of a wood plug pressed into the end of the spar, no further action is mandatory. If cracks are found, the spar should be repaired by cutting the spar member approximately 3 1/4 inches above the lower bend and splicing on, by means of 3/16-inch bolts, a 1 1/8 by 0.058 inch X-4130 spar replacement section. (Ryan Service Bulletin No. 1044 covers the installation of the wood plug and Ryan drawing SK-1879 covers the splice repair.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_46-06-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 46-06-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Ryan Model ST-3KR Aircraft Subject: Front Fin Spar Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Ryan Aeronautical Company Model: ST-3KR 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: 46-06-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 46-06-01 SUBJECT HEADING: Airworthiness Directives; Ryan Model ST-3KR Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 46-06-01 RYAN: (Was Service Note 5 of AD-749-1.) Applies Only to Model ST-3KR Aircraft Serial Numbers 1001 to 2249, Inclusive. At each periodic inspection examine the front fin spar at its attachment to the fuselage for cracks. If no cracks are found and if spar has been reinforced at the critical section by means of a wood plug pressed into the end of the spar, no further action is mandatory. If cracks are found, the spar should be repaired by cutting the spar member approximately 3 1/4 inches above the lower bend and splicing on, by means of 3/16-inch bolts, a 1 1/8 by 0.058 inch X-4130 spar replacement section. (Ryan Service Bulletin No. 1044 covers the installation of the wood plug and Ryan drawing SK-1879 covers the splice repair.) 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.