AD 73-12-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | 19A | Airworthiness Directives; BEECH Models 23, B23, C23, Sundowner C23, A23-19, 19A, M-19A, B19, and Sport B19 Airplanes |
| aircraft | Textron Aviation Inc. | 23 | Airworthiness Directives; BEECH Models 23, B23, C23, Sundowner C23, A23-19, 19A, M-19A, B19, and Sport B19 Airplanes |
| aircraft | Textron Aviation Inc. | A23-19 | Airworthiness Directives; BEECH Models 23, B23, C23, Sundowner C23, A23-19, 19A, M-19A, B19, and Sport B19 Airplanes |
| aircraft | Textron Aviation Inc. | B19 | Airworthiness Directives; BEECH Models 23, B23, C23, Sundowner C23, A23-19, 19A, M-19A, B19, and Sport B19 Airplanes |
| aircraft | Textron Aviation Inc. | B23 | Airworthiness Directives; BEECH Models 23, B23, C23, Sundowner C23, A23-19, 19A, M-19A, B19, and Sport B19 Airplanes |
| aircraft | Textron Aviation Inc. | C23 | Airworthiness Directives; BEECH Models 23, B23, C23, Sundowner C23, A23-19, 19A, M-19A, B19, and Sport B19 Airplanes |
| aircraft | Textron Aviation Inc. | M19A | Airworthiness Directives; BEECH Models 23, B23, C23, Sundowner C23, A23-19, 19A, M-19A, B19, and Sport B19 Airplanes |
Unsafe Condition
Engine power loss caused by ingestion of pieces of failed carburetor air valves.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the carburetor air box for wear and looseness between the carburetor alternate air valve and its shaft, looseness of rivets holding the valve plates together, and looseness and wear of cap screws attaching the valve plates to the shaft. If any conditions are found, remove the existing carburetor air box valve and install Beech P/N 23-9011-1S, 3S, or 5S Kit as applicable, following Beechcraft Service Instructions 0574-241 or FAA-approved revision. The inspection must be done prior to further flight, with subsequent intervals not exceeding 25 hours' time in service. The installation must be completed within 120 days after the AD's effective date.
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Compliance Time
Prior to further flight, except that the airplane may be ferried to the inspection location and at subsequent intervals not to exceed 25 hours' time in service. The installation must be completed within 120 days after the effective date of this AD.
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Affected Aircraft
BEECH Models 23, B23, C23 (Serial Numbers M-1 through M-554 and M-1095 through M-1361 except M-3); Sundowner C23 (Serial Numbers M-1362 through M-1420, M-1423, M-1425, M-1430, M-1438, M-1439, M-1442, M-1447, and M-1453 through M-1473); Models A23-19, 19A, M-19A, and B19 (Serial Numbers MB-1 through MB-520); and Sport B19 (Serial Numbers MB-521 through MB-585) airplanes without carburetor alternate air boxes modified per Beechcraft Service Instruction 0574-241.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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