| AD Number | 64-06-01 | Status | Active |
| Effective Date | March 17, 1964 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | N/A |
| Product Type | ["Aircraft"] | Product Subtype | ["Small Airplane"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | Federal Register: March 11, 1964 | ||
| Manufacturer(s) | Textron Aviation Inc. |
| Model(s) | 23 |
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.