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.
AI-generated summary from the source AD text. Verify against the official source before acting.
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.
AI-generated summary from the source AD text. Verify against the official source before acting.
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.
Federal Register Abstract
Carburetor Air Box Valve
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_73-12-11.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 73-12-11 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BEECH Models 23, B23, C23, Sundowner C23, A23-19, 19A, M-19A, B19, and Sp...Show more Subject: Carburetor Air Box Valve Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/27/1973 Make: Textron Aviation Inc. Model: 19A | 23 | A23-19 | B19 | B23 | C23 | M19A 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: 73-12-11 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1691 AD NUMBER: 73-12-11 SUBJECT HEADING: Airworthiness Directives; BEECH Models 23, B23, C23, Sundowner C23, A23-19, 19A, M-19A, B19, and Sport B19 Airplanes ACTION: SUMMARY: DATES: Effective July 27, 1973. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 73-12-11 BEECH: Amdt. 39-1662 as amended by Amendment 39-1691. Applies to Models 23, B23, and 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 which do not have carburetor alternate air boxes modified in accordance with Beechcraft Service Instruction 0574-241 (installation of Beech P/N 23-9011-1S, 3S, or 5S Kits). Compliance: Required as indicated, unless already accomplished. To prevent engine power loss caused by ingestion of pieces of failed carburetor air valves, accomplish the following: A) 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, inspect the carburetor air box for the following: 1) Wear and looseness between the carburetor alternate air valve and its shaft. 2) Looseness of rivets which hold the valve plates together. 3) Looseness and wear of the cap screws which attach the valve plates to the shaft. If any of these conditions are found, accomplish Paragraph B below. B) Within 120 days after the effective date of this AD, remove the existing carburetor air box valve and install Beech P/N 23-9011-1S or 23-9011-3S or 23-9011-5S Kit, as applicable, in accordance with Beechcraft Service Instructions 0574-241, or later FAA-approved revision or any alternate modification approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. The repetitive inspections specified in Paragraph A may be discontinued when this modification is accomplished. This AD Amendment 39-1662 cancels and supersedes AD 72-01-04. Amendment 39-1662 became effective June 18, 1973. This amendment 39-1691 becomes effective July 27, 1973, to all persons except those to whom it was made effective by letter dated July 9, 1973. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_73-12-11.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 73-12-11 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BEECH Models 23, B23, C23, Sundowner C23, A23-19, 19A, M-19A, B19, and Sp...Show more Subject: Carburetor Air Box Valve Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/27/1973 Make: Textron Aviation Inc. Model: 19A | 23 | A23-19 | B19 | B23 | C23 | M19A 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: 73-12-11 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1691 AD NUMBER: 73-12-11 SUBJECT HEADING: Airworthiness Directives; BEECH Models 23, B23, C23, Sundowner C23, A23-19, 19A, M-19A, B19, and Sport B19 Airplanes ACTION: SUMMARY: DATES: Effective July 27, 1973. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 73-12-11 BEECH: Amdt. 39-1662 as amended by Amendment 39-1691. Applies to Models 23, B23, and 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 which do not have carburetor alternate air boxes modified in accordance with Beechcraft Service Instruction 0574-241 (installation of Beech P/N 23-9011-1S, 3S, or 5S Kits). Compliance: Required as indicated, unless already accomplished. To prevent engine power loss caused by ingestion of pieces of failed carburetor air valves, accomplish the following: A) 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, inspect the carburetor air box for the following: 1) Wear and looseness between the carburetor alternate air valve and its shaft. 2) Looseness of rivets which hold the valve plates together. 3) Looseness and wear of the cap screws which attach the valve plates to the shaft. If any of these conditions are found, accomplish Paragraph B below. B) Within 120 days after the effective date of this AD, remove the existing carburetor air box valve and install Beech P/N 23-9011-1S or 23-9011-3S or 23-9011-5S Kit, as applicable, in accordance with Beechcraft Service Instructions 0574-241, or later FAA-approved revision or any alternate modification approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. The repetitive inspections specified in Paragraph A may be discontinued when this modification is accomplished. This AD Amendment 39-1662 cancels and supersedes AD 72-01-04. Amendment 39-1662 became effective June 18, 1973. This amendment 39-1691 becomes effective July 27, 1973, to all persons except those to whom it was made effective by letter dated July 9, 1973. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
Related Airworthiness Directives
2024-14-03
final ruleAirworthiness Directives; Various Airplanes
Unsafe Condition: an un-commanded automatic pitch trim runaway when the autopilot was first engaged, which could result in un-commanded automatic pitch trim runaway and loss of control of the airplane.
2023-10-02
final ruleAirworthiness Directives; Transport and Commuter Category Airplanes
Unsafe Condition: Radio altimeter anomalies that are undetected by the automation or pilot, particularly close to the ground (e.g., landing flare), could lead to loss of continued safe flight and landing. Additional...
2022-03-15
final ruleAirworthiness Directives; Various Airplanes
Unsafe Condition: The displayed fuel quantity can have an error as much as four gallons/fuel tank with the display indicating four gallons with an empty tank. In the context of this event, the end level effect is th...
2005-01-19
final ruleAirworthiness Directives; GARMIN International Inc. GTX 33, GTX 33D, GTX 330, and GTX 330D Mode S Transponders
Unsafe Condition: The GTX 33/33D/330/330D Mode S transponders may detect the S1 (suppression) interrogating pulse below the minimum trigger level (MTL) and, in some circumstances, not reply. This could lead to inacc...