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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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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