# AD 46-13-02: Dual Fuel System

- Type: Airworthiness directive
- Status: Current
- Products: Lockheed 18
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 2 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/190C8B7D172DAAC18625696D00719C67.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/46-13-02

## The airworthiness directive

46-13-02 LOCKHEED: (Was Mandatory Note 18 of AD-723-2). Applies Only to Model 18 Airplanes Used in Scheduled Air Carrier Operation.

Compliance required not later than April 30, 1946.

In order to comply with CAR Special Regulation 333, the present fuel system plumbing equipment shall be replaced with a dual fuel system in accordance with Lockheed Service Bulletin No. 18/SB-113, dated August 17, 1945, or any other dual fuel system approved by the Administrator.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-723](https://openairdocs.org/tcds/A-723): Lockheed Martin Aeronautics Company; names 1 of 1 models: 18

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

Models with the most aircraft:

- [Lockheed 18](https://openairdocs.org/model/lockheed-18): 2 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/46-13-02/models.md
Every aircraft: https://openairdocs.org/ad/46-13-02/aircraft.md

Its text cites no advisory circulars or STCs.

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