# AD 56-04-02: Fuel Supply Lines

- Type: Airworthiness directive
- Status: Current
- Products: Kelowna Flightcraft R & D 240 Series and 340
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 7 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B178274BB5736667862569AB006E753D.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/56-04-02

## The airworthiness directive

56-04-02 CONVAIR: Applies to All 240 and 340 Aircraft.

Compliance required as soon as possible but not later than February 1, 1957, for Model 240 and August 1, 1957, for Model 340.

As a result of a recent accident involving a nacelle fire, additional fire protection for the nacelle is required.

The following changes or equivalent must be made to accomplish the above:

1. Replace aluminum alloy engine fuel supply lines, and sleeves, nuts and tube unions, with steel lines in the wheel well area (zone 3), except for lines and fittings outboard of the main landing gear beam. This does not apply to lines and fittings between cross-feed valves.

2. Replace present flexible hose assemblies in the engine fuel supply system in the wheel well area (zone 3), including AN fittings, with steel tubing and/or fireproof flexible lines, except for lines and fittings outboard of the main landing gear beam. Flexible lines qualifying as fireproof may incorporate either steel or aluminum fittings.

3. (a) CV-340 airplanes only. Replace aluminum alloy propeller pump suction line in left-hand nacelle wheel well (zone 3) with a steel line.

  (b) CV-240 airplanes only. Replace aluminum alloy propeller pump suction line in wheel well area (zone 3) with a steel line. (Both nacelles.) (Original flexible hose connections will be satisfactory if provided with a steel liner.)

4. Protect existing oil hose assemblies in wheel well area (zone 3) with asbestos sleeves or equivalent.

5. Replace all micarta pulleys in wheel well area (zone 3) with aluminum alloy pulleys. (Convair Service Bulletins Numbers 240-467 and 340-167 cover items 1 through 4. Convair Service Bulletins Numbers 240-468 and 340-166 cover item 5. These bulletins also contain some items which are not mandatory but are recommended.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 6A6](https://openairdocs.org/tcds/6A6): Kelowna Flightcraft R & D Ltd.; names 1 of 6 models: 340
- [TCDS A-793](https://openairdocs.org/tcds/A-793): Kelowna Flightcraft R & D Ltd.; names 1 of 1 models: 240 Series

## 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: 7 (7 by airframe model, 0 by engine model)
- Makers: Convair 7

Models with the most aircraft:

- [Convair 340](https://openairdocs.org/model/convair-340): 7 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/56-04-02/models.md
Every aircraft: https://openairdocs.org/ad/56-04-02/aircraft.md

Its text cites no advisory circulars or STCs.

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