AD 48-25-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 120 | Airworthiness Directives; CESSNA Model 120 and 140 Airplanes |
| aircraft | Cessna Aircraft Company | 140 | Airworthiness Directives; CESSNA Model 120 and 140 Airplanes |
Unsafe Condition
Cracks in the Cessna welded exhaust muffler assemblies, particularly at the welds between exhaust stacks and muffler assemblies, could lead to exhaust leaks and potential fire hazards.
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Required Actions
Inspect muffler assemblies every 25 hours of operation for cracks adjacent to welds between exhaust stacks and muffler assemblies. Remove carburetor air heater muff and cabin heater muff for inspection. Revise the placard to require inspection every 25 hours instead of every 100 hours.
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Compliance Time
each 25 hours of operation
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Affected Aircraft
Cessna Model 120 and 140 aircraft equipped with Cessna Welded Exhaust Muffler Assemblies.
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Federal Register Abstract
Welded Exhaust Muffler
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_48-25-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 48-25-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; CESSNA Model 120 and 140 Airplanes Subject: Welded Exhaust Muffler Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Cessna Aircraft Company Model: 120 | 140 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 48-25-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 48-25-02 SUBJECT HEADING: Airworthiness Directives; CESSNA Model 120 and 140 Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 48-25-02 CESSNA: Applies to All 120 and 140 Aircraft Equipped With Cessna Welded Exhaust Muffler Assemblies. Inspection required each 25 hours of operation. Remove the carburetor air heater muff and cabin heater muff and inspect the muffler assemblies for any evidence of cracks paying particular attention to the areas of the mufflers and stacks adjacent to where the exhaust stacks and tailpipe are welded to the muffler assembly. The present placard calling for inspection of the mufflers every 100 hours should be revised to call for this inspection every 25 hours. This directive is intended to apply to only those aircraft equipped with exhaust muffler assemblies that are fabricated by welding exhaust stacks to muffler. FOOTER:
Document Text
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AD Final Rules - DRS_48-25-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 48-25-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; CESSNA Model 120 and 140 Airplanes Subject: Welded Exhaust Muffler Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Cessna Aircraft Company Model: 120 | 140 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: 48-25-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 48-25-02 SUBJECT HEADING: Airworthiness Directives; CESSNA Model 120 and 140 Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 48-25-02 CESSNA: Applies to All 120 and 140 Aircraft Equipped With Cessna Welded Exhaust Muffler Assemblies. Inspection required each 25 hours of operation. Remove the carburetor air heater muff and cabin heater muff and inspect the muffler assemblies for any evidence of cracks paying particular attention to the areas of the mufflers and stacks adjacent to where the exhaust stacks and tailpipe are welded to the muffler assembly. The present placard calling for inspection of the mufflers every 100 hours should be revised to call for this inspection every 25 hours. This directive is intended to apply to only those aircraft equipped with exhaust muffler assemblies that are fabricated by welding exhaust stacks to muffler. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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