AD 46-23-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Univair Aircraft Corporation | 415-C | Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft |
| aircraft | Univair Aircraft Corporation | 415-CD | Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft |
| aircraft | Univair Aircraft Corporation | 415-D | Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft |
Unsafe Condition
The original muffler on ERCO Model 415-C, -CD, and -D aircraft serial numbers 113 to 362 may fail, leading to potential exhaust system leaks and reduced engine performance.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the original muffler with the new muffler Erco P/N 145-40517 within the next 50 hours of operation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within next 50 hours of operation
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Univair Aircraft Corporation Model 415-C, -CD, and -D aircraft with serial numbers 113 to 362, inclusive.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Muffler Replacement
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_46-23-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 46-23-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft Subject: Muffler Replacement Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Univair Aircraft Corporation Model: 415-C | 415-CD | 415-D Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 46-23-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 46-23-01 SUBJECT HEADING: Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 46-23-01 ERCO: (Was Mandatory Note 4 of AD-718-6.) Applies Only to 415-C, -CD and -D Aircraft Serial Numbers 113 to 362, Inclusive. To be accomplished within next 50 hours of operation. Trouble in service has indicated the necessity for replacing the original muffler on the serial numbers listed above with a new muffler, Erco P/N 145-40517. (Erco Service Department Memorandum No. 7 dated February 1, 1946, covers this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_46-23-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 46-23-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft Subject: Muffler Replacement Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Univair Aircraft Corporation Model: 415-C | 415-CD | 415-D 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: 46-23-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 46-23-01 SUBJECT HEADING: Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 46-23-01 ERCO: (Was Mandatory Note 4 of AD-718-6.) Applies Only to 415-C, -CD and -D Aircraft Serial Numbers 113 to 362, Inclusive. To be accomplished within next 50 hours of operation. Trouble in service has indicated the necessity for replacing the original muffler on the serial numbers listed above with a new muffler, Erco P/N 145-40517. (Erco Service Department Memorandum No. 7 dated February 1, 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
2012-08-06
final ruleAirworthiness Directives; Univair Aircraft Corporation Airplanes
Unsafe Condition: The FAA is correcting an airworthiness directive (AD) that published in the Federal Register. That AD applies to certain Univair Aircraft Corporation Models (ERCO) 415-C, 415-CD, 415-D, E, G; (Forn...
2003-21-01 Recurring
final ruleAirworthiness Directives; Univair Aircraft Corporation Models Alon A-2 and A2-A; ERCO 415-C, 415-CD, 415-D, 415-E, and 415-G; Forney F-1 and F-1A; and Mooney M10 Airplanes
Unsafe Condition: Corrosion in the wing outer panel structural components, which, if not detected and corrected, could progress to structural failure.
2002-26-02 Recurring
final ruleAirworthiness Directives; Univair Aircraft Corporation Models Alon A-2 and A2-A; ERCO 415-C, 415-CD, 415-D, 415-E, and 415-G; Forney F-1 and F-1A; and Mooney M10 Airplanes
Unsafe Condition: Corrosion in the wing center section structure could result in failure of the wing center section structure during flight, leading to loss of control of the airplane.
2002-16-04
final ruleAirworthiness Directives; Univair Aircraft Corporation Models (ERCO) 415-C, (ERCO) 415-CD, (ERCO) 415-D, (ERCO) 415-E, (ERCO) 415-G, (Forney) F-1, and (Forney) F-1A Airplanes
Unsafe Condition: Cracks in the aluminum fuel line nipples, aluminum fuel line elbows, and/or lack of double support tubes on the gascolator could lead to failure of the fuel line fittings or the gascolator, resulti...
