AD 64-06-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | 23 | Airworthiness Directives; Beech Model 23 Aircraft |
Unsafe Condition
Failures of the cabin heater/muffler weld assembly, Beech P/N 169-950010-21, have occurred. Such failures can cause hazardous quantities of carbon monoxide to enter the cabin when cabin heat is used.
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Required Actions
Install a stainless steel dam around the exhaust tube between the muffler assembly and heater shroud assembly in accordance with Beechcraft Service Bulletin No. 64-1 dated January 13, 1964; or render the cabin heat and windshield defrost system inoperative by positively securing in the closed position the sliding doors of both the cabin heat and the defrost valves in the airplane firewall.
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Compliance Time
within 10 hours' time in service after the effective date of this AD, unless already accomplished
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Affected Aircraft
All Model 23 Aircraft Prior to Serial Number M-555 Except Serial Number M-1
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Federal Register Abstract
Cabin Heater/Muffler Weld Assembly
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_64-06-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 64-06-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Beech Model 23 Aircraft Subject: Cabin Heater/Muffler Weld Assembly Status: Current Citation: Federal Register: March 11, 1964 Citation Publish Date: 03/11/1964 Effective Date: 03/17/1964 Make: Textron Aviation Inc. Model: 23 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 64-06-01 CITATION: [Federal Register: March 11, 1964] PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 64-06-01 SUBJECT HEADING: Airworthiness Directives; Beech Model 23 Aircraft ACTION: SUMMARY: DATES: Effective March 17, 1964. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 64-06-01 BEECH: Amdt. 703 Part 507 Federal Register March 11, 1964. Applies to All Model 23 Aircraft Prior to Serial Number M-555 Except Serial Number M-1. Compliance required within 10 hours' time in service after the effective date of this AD, unless already accomplished. Failures of the cabin heater/muffler weld assembly, Beech P/N 169-950010-21, have occurred. Such failures can cause hazardous quantities of carbon monoxide to enter the cabin when cabin heat is used. To preclude carbon monoxide contamination of cabin air, accomplish either of the following: (a) Install a stainless steel dam around the exhaust tube between the muffler assembly and heater shroud assembly in accordance with Beechcraft Service Bulletin No. 64-1 dated January 13, 1964; or (b) Render the cabin heat and windshield defrost system inoperative by positively securing in the closed position the sliding doors of both the cabin heat and the defrost valves in the airplane firewall. This directive effective March 17, 1964. FOOTER:
Document Text
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AD Final Rules - DRS_64-06-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 64-06-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Beech Model 23 Aircraft Subject: Cabin Heater/Muffler Weld Assembly Status: Current Citation: Federal Register: March 11, 1964 Citation Publish Date: 03/11/1964 Effective Date: 03/17/1964 Make: Textron Aviation Inc. Model: 23 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: 64-06-01 CITATION: [Federal Register: March 11, 1964] PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 64-06-01 SUBJECT HEADING: Airworthiness Directives; Beech Model 23 Aircraft ACTION: SUMMARY: DATES: Effective March 17, 1964. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 64-06-01 BEECH: Amdt. 703 Part 507 Federal Register March 11, 1964. Applies to All Model 23 Aircraft Prior to Serial Number M-555 Except Serial Number M-1. Compliance required within 10 hours' time in service after the effective date of this AD, unless already accomplished. Failures of the cabin heater/muffler weld assembly, Beech P/N 169-950010-21, have occurred. Such failures can cause hazardous quantities of carbon monoxide to enter the cabin when cabin heat is used. To preclude carbon monoxide contamination of cabin air, accomplish either of the following: (a) Install a stainless steel dam around the exhaust tube between the muffler assembly and heater shroud assembly in accordance with Beechcraft Service Bulletin No. 64-1 dated January 13, 1964; or (b) Render the cabin heat and windshield defrost system inoperative by positively securing in the closed position the sliding doors of both the cabin heat and the defrost valves in the airplane firewall. This directive effective March 17, 1964. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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