AD 47-21-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sky Enterprises, Inc. | RC-3 | Airworthiness Directives; Republic Model RC-3 Aircraft |
Unsafe Condition
Short circuiting of terminal studs on the firewall
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove each stud, enlarge the hole using a 0.316 drill, and insert a bushing (P/N 17F82080-1).
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to July 1, 1947
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Republic Model RC-3 Aircraft Serial Numbers 5 to 174, Inclusive.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Firewall Stud Bushings
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-21-11.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-21-11 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Republic Model RC-3 Aircraft Subject: Firewall Stud Bushings Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Sky Enterprises, Inc. Model: RC-3 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-21-11 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-21-11 SUBJECT HEADING: Airworthiness Directives; Republic Model RC-3 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-21-11 REPUBLIC: (Was Mandatory Note 1 of AD-769-2.) Applies to Model RC-3 Aircraft Serial Numbers 5 to 174, Inclusive. Compliance required prior to July 1, 1947. In order to prevent short circuiting of terminal studs on the firewall, remove each stud, enlarge the hole (0.316 drill) and insert a bushing (P/N 17F82080-1). (Republic Seabee Service Bulletin No. 1, dated December 18, 1946, covers this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_47-21-11.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-21-11 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Republic Model RC-3 Aircraft Subject: Firewall Stud Bushings Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Sky Enterprises, Inc. Model: RC-3 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: 47-21-11 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-21-11 SUBJECT HEADING: Airworthiness Directives; Republic Model RC-3 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-21-11 REPUBLIC: (Was Mandatory Note 1 of AD-769-2.) Applies to Model RC-3 Aircraft Serial Numbers 5 to 174, Inclusive. Compliance required prior to July 1, 1947. In order to prevent short circuiting of terminal studs on the firewall, remove each stud, enlarge the hole (0.316 drill) and insert a bushing (P/N 17F82080-1). (Republic Seabee Service Bulletin No. 1, dated December 18, 1946, covers this same 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.
Related Airworthiness Directives
48-11-04
final ruleAirworthiness Directives; Republic Model RC-3 Aircraft
Unsafe Condition: The hydraulic pump handle attachment is insecure due to the use of self-locking nuts that may not provide adequate security.
48-01-03
final ruleAirworthiness Directives; Republic Model RC-3 Aircraft
Unsafe Condition: Excessive play in the elevator trim tab due to wear in the clevis pin hole of the horn, which could reduce control effectiveness.
47-21-22
final ruleAirworthiness Directives; Republic Model RC-3 Aircraft
Unsafe Condition: Loosening of engine mounting bolts due to absence or improper installation of tab type lockwashers.
47-21-20
final ruleAirworthiness Directives; Republic Model RC-3 Aircraft
Unsafe Condition: Excessive loss of oil through oil pressure gage line in case of its failure.