# AD 74-14-02: Carburetor and Air Controls

- Type: Airworthiness directive
- Status: Current
- Products: Textron B19 and C23
- Effective: August 28, 1974
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-1931
- Registered aircraft: 604 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/440AE7AB8AC1D69086256E0D004DF129.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/74-14-02

## The airworthiness directive

74-14-02 BEECH: Amendment 39-1884 as amended by Amendment 39-1931. Applies to Models B19 and C23 airplanes as set forth below.

Compliance: Required within 100 hours' time in service after the effective date of this AD, unless already accomplished.

To assure proper operation of the carburetor mixture and/or alternate air controls, accomplish the following:

A) On Models B19 Sport 150 (Serial Numbers MB-558 through MB-575) airplanes, visually inspect the carburetor heat control and install Beech Kit No. 23-9013-1S as required in accordance with Beechcraft Service Instructions 0608-159 or subsequent revisions.

B) On Models C23 Sundowner 180 (Serial Numbers M-1413, M-1417, M-1421, M- 1430 through M-1432) airplanes, visually inspect the fuel mixture and/or carburetor heat controls, and install Beech Kit 23-9013-3S as required in accordance with Beechcraft Service Instruction 0608-159 and install a spacer in the fuel mixture control cable installation in accordance with Beechcraft Service Instruction 0635-159 or subsequent revisions.

C) On Models C23 Sundowner 180 (Serial Numbers M-1414, M-1416, M-1418, M- 1420, M-1422, M-1424 through M-1429, M-1433 through M-1436, M-1438, M-1440 through M-1446, M-1448 through M-1451, M-1455, M-1459, M-1460, M-1462, M-1463, M-1465 through M-1491, M-1523 through M-1537) airplanes, reroute the fuel mixture control cable and install Beech Kit No. 23-9013-5S in accordance with Beechcraft Service Instruction No. 0608- 159 or subsequent revisions, and install a spacer in the fuel mixture control cable installation in accordance with Beechcraft Service Instruction No. 0635-159, or subsequent revisions.

D) On those models and serial numbers listed herein, where a control cable is rerouted, plug the existing control hole in the firewall with a suitable fireproof compound, rivet or bolt.

E) Any equivalent method of compliance with this AD must be submitted to and approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region.

Amendment 39-1884 became effective July 8, 1974.

This Amendment 39-1931 becomes effective August 28, 1974.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A1CE](https://openairdocs.org/tcds/A1CE): Textron Aviation Inc.; names 2 of 14 models: B19, C23

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 604 (604 by airframe model, 0 by engine model)
- Makers: Beech 604

Models with the most aircraft:

- [Beech C23](https://openairdocs.org/model/beech-c23): 456 aircraft (airframe model)
- [Beech B19](https://openairdocs.org/model/beech-b19): 145 aircraft (airframe model)
- [Beech B-19 SPORT](https://openairdocs.org/model/beech-b-19-sport): 2 aircraft (airframe model)
- [Beech C 23](https://openairdocs.org/model/beech-c-23): 1 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/74-14-02/models.md
Every aircraft: https://openairdocs.org/ad/74-14-02/aircraft.md

Its text cites no advisory circulars or STCs.

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