# AD 49-12-02: Fuel Pumps

- Type: Airworthiness directive
- Status: Current
- Products: Sierra Hotel Aero Navion (Army L-17A) and Navion A (Army L-17B and L-17C)
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 633 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/67FA99A30E225FB086256A56006F8C23.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/49-12-02

## The airworthiness directive

49-12-02 NAVION: Applies to All Airplanes Equipped With Romec Engine-Driven Fuel Pumps.

To be accomplished as soon as possible, but not later than May 1, 1949.

On some of the Romec fuel pumps, a 1/16-inch hole has been drilled through the 1/8-inch pipe plug which closes the vent opening at the top of the pump. This is a fire hazard since, in the event of pump seal failure, fuel could squirt from this hole into the generator which is directly above the fuel pump, and into the engine compartment. It is therefore required that all drilled vent plugs be replaced by undrilled plugs.

The Ryan factory has accomplished this change in production, starting with airplane Serial Number 1823. Undrilled vent plugs are being painted with zinc chromate primer at the Ryan factory.

## 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 2 of 8 models: Navion (Army L-17A), Navion A (Army L-17B and L-17C)

## 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: 633 (633 by airframe model, 0 by engine model)
- Makers: Ryan 285, North American 249, Navion 99

Models with the most aircraft:

- [North American NAVION](https://openairdocs.org/model/north-american-navion): 203 aircraft (airframe model)
- [Ryan NAVION](https://openairdocs.org/model/ryan-navion): 170 aircraft (airframe model)
- [Ryan NAVION A](https://openairdocs.org/model/ryan-navion-a): 115 aircraft (airframe model)
- [Navion NAVION A](https://openairdocs.org/model/navion-navion-a): 99 aircraft (airframe model)
- [North American NAVION A](https://openairdocs.org/model/north-american-navion-a): 46 aircraft (airframe model)

All 6 models: https://openairdocs.org/ad/49-12-02/models.md
Every aircraft: https://openairdocs.org/ad/49-12-02/aircraft.md

Its text cites no advisory circulars or STCs.

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