S3479-1 - Textron Aviation OEM Oil Pressure Sender Transducer Transmitter

S3479-1 – Textron Aviation OEM Oil Pressure Sender Transducer Transmitter

Available now on the Airparts.aero Marketplace.

Overview

The Textron Aviation S3479-1 is a genuine OEM, flight-critical oil pressure transducer, an essential sensor for the engine indication systems of a wide range of Cessna piston aircraft. This is not a simple pressure switch; it is a high-precision, variable-resistance transducer designed to convert engine oil pressure into a proportional electrical signal. The S3479-1 provides the continuous, real-time data that is sent to the cockpit pressure gauges, giving the pilot one of the most vital indications of engine health.

Manufactured by leading sensor specialists like Rochester Gauges to Cessna's exact specifications, this transducer is engineered for exceptional accuracy and durability. Its robust design ensures it can withstand the extreme temperatures and intense vibration of the firewall-forward environment, providing the reliable data required for safe engine operation.

Key Features

• Variable-Resistance Transducer: At its core is a variable resistor (rheostat) mechanism, typically a precision wire-wound element with a wiper arm. The wiper is mechanically linked to a pressure-sensitive diaphragm, providing a smooth and linear change in electrical resistance that is directly proportional to the applied oil pressure.

• High-Accuracy & Stability: Engineered to provide accurate and stable pressure readings across its full operational range. This is essential for the pilot to make correct power setting decisions and to detect subtle changes in engine health.

• Durable, Sealed Construction: The entire assembly is housed in a hermetically sealed, corrosion-resistant metal case. This protects the sensitive internal mechanisms from moisture, engine fluids, and contaminants, ensuring a long and reliable service life.

• Vibration Hardened: Specifically designed and tested to withstand the high-frequency vibrations produced by reciprocating piston engines, ensuring the wiper maintains a steady contact with the resistive element for a stable, flicker-free gauge reading.

• Genuine Textron OEM Part: As a genuine factory-specified component, it guarantees the correct pressure range, resistance curve, and electrical interface to be perfectly matched with the aircraft's cockpit oil pressure indicators.

Technical Specifications

• Part Number: S3479-1

• Component Type: Oil Pressure Sender / Transducer

• **OEM Manufacturer (Typical): ** Rochester Gauges, Inc.

• Sensing Technology: Variable Resistance (Rheostat)

• Pressure Range: Calibrated for Continental engine oil pressure systems (typically 0-100 PSI).

• Electrical Output: Variable Resistance (Ohms)

• Plumbing Connection: Standard 1/8-27 NPT male pipe thread.

• Electrical Connection: Threaded Stud Terminal

• Certification: FAA Production Approval

Aircraft Compatibility

The Textron Aviation S3479-1 is a standard OEM sensor on some of the most popular and successful general aviation aircraft ever built. It is imperative to consult the specific aircraft's Illustrated Parts Catalog (IPC) for final verification.

• Common Cessna Aircraft Platforms:

  • Cessna 182 Skylane

  • Cessna 206 Stationair

  • Cessna 210 Centurion

  • Cessna 310, 337 Skymaster, 340

  • Cessna 402, 414, 421

Applications

The S3479-1 is a flight-critical sensor for all phases of flight:

• Primary Engine Monitoring: Provides the raw data for the cockpit oil pressure gauge, a primary flight instrument. A loss of oil pressure is a critical in-flight emergency requiring immediate action.

• Engine Start & Health Check: Allows the pilot to confirm a positive rise in oil pressure immediately after engine start, verifying the health of the lubrication system.

• System Troubleshooting: The primary component to test and replace when diagnosing an inaccurate, pegged, or inoperative oil pressure indication.

Why Choose S3479-1?

An accurate oil pressure reading is arguably the single most important indication of a piston engine's health. A faulty sender can provide a dangerously false sense of security or cause an unnecessary precautionary engine shutdown. The Textron Aviation S3479-1 is the genuine, factory-specified component designed to work in perfect harmony with your aircraft's original gauge. For a primary engine instrument sensor, there is no substitute for the certified accuracy, quality, and airworthiness of a genuine OEM part.

The Textron S3479-1 transducer is a simple but highly reliable analog sensor. Internally, high-pressure engine oil enters the unit and acts upon a flexible metal diaphragm or bellows. This diaphragm is mechanically connected via a small linkage to a wiper arm. The wiper arm moves across the surface of a wire-wound resistor card. As the oil pressure increases, the diaphragm flexes, moving the wiper arm across the resistor and changing the total resistance between the sensor's output terminal and its ground. The cockpit gauge is essentially a ratiometric voltmeter that interprets this change in resistance and displays it on a calibrated PSI scale. This direct, mechanical-to-electrical conversion is extremely robust and is not susceptible to the software or processing failures that can affect more complex digital sensors, making it a time-proven solution for primary engine instrumentation.

Note: This is a flight-critical engine instrument sensor. Installation must be performed by a certified A&P mechanic. Use an appropriate thread sealant on the pipe threads to ensure a leak-proof seal. Do not overtighten, as this can damage the transducer or the engine case. Verify a correct and stable pressure reading after installation and engine run-up.