# AD 46-44-04: Carburetor Hot Air Ducts

- Type: Airworthiness directive
- Status: Current
- Products: Cessna 120 and 140
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 2,265 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/681E719E8965BA8E86256A34005FE7E3.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/46-44-04

## The airworthiness directive

46-44-04 CESSNA: (Was Mandatory Note 4 of AD-768-4.) Applies to 120 and 140 Aircraft Serial Numbers Up to and Including 9721.

Replacement required prior to December 1, 1946.

All U. S. Rubber Co. P-212 and P-212L Series flexible ducts installed in the carburetor hot air system should be replaced by U. S. Rubber Co. P-208-S duct or P-208 duct coated with neoprene by Cessna or its distributors.

(Cessna Service Letter No. 16-120 and 140 covers this same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-768](https://openairdocs.org/tcds/A-768): Textron Aviation Inc.; names 2 of 2 models: 140, 120

## 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: 2,265 (2,265 by airframe model, 0 by engine model)
- Makers: Cessna 2,265

Models with the most aircraft:

- [Cessna 140](https://openairdocs.org/model/cessna-140): 1,605 aircraft (airframe model)
- [Cessna 120](https://openairdocs.org/model/cessna-120): 660 aircraft (airframe model)

All 3 models: https://openairdocs.org/ad/46-44-04/models.md
Every aircraft: https://openairdocs.org/ad/46-44-04/aircraft.md

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.