# AD 52-08-02: Carburetor Ducting

- Type: Airworthiness directive
- Status: Current
- Products: Sierra Hotel Aero Navion B
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 113 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F40BEABF1997024886256A56006FA0C5.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/52-08-02

## The airworthiness directive

52-08-02 NAVION: Applies to All Model B Aircraft and Cancels AD 51-19-03 Upon Compliance.

Compliance required not later than June 15, 1952.

Due to reports of engine malfunction caused by collapse of flexible ducts in the air induction system, it is necessary to replace the section P/N 146-42207 ducting between the carburetor air filter assembly and the carburetor air mix box with wire reinforced ducting, or its equivalent.

(Ryan Field Service Bulletin No. 16, dated February 12, 1952, covers this same subject.)

This supersedes AD 51-19-03.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-782](https://openairdocs.org/tcds/A-782): Sierra Hotel Aero Inc.; names 1 of 8 models: Navion B

## 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: 113 (113 by airframe model, 0 by engine model)
- Makers: Ryan 68, Navion 42, North American 3

Models with the most aircraft:

- [Ryan NAVION B](https://openairdocs.org/model/ryan-navion-b): 68 aircraft (airframe model)
- [Navion NAVION B](https://openairdocs.org/model/navion-navion-b): 42 aircraft (airframe model)
- [North American NAVION B](https://openairdocs.org/model/north-american-navion-b): 3 aircraft (airframe model)

All 3 models: https://openairdocs.org/ad/52-08-02/models.md
Every aircraft: https://openairdocs.org/ad/52-08-02/aircraft.md

Its text cites no advisory circulars or STCs.

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