3074541-4 - Textron Aviation OEM Gas Turbine Engine Igniter Plug TFE731

3074541-4 – Textron Aviation OEM Igniter Plug for Honeywell TFE731 Engines

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Overview

The 3074541-4 is a flight-critical, genuine Original Equipment Manufacturer (OEM) igniter plug for the Honeywell TFE731 series turbofan engine, supplied with the full certification and traceability of Textron Aviation. This is not a conventional spark plug; it is a highly engineered device designed to deliver a massive, high-energy spark to initiate combustion within the engine's annular combustor during the start sequence. Its function is absolutely essential for reliable engine starting, both on the ground and for in-flight restarts.

This igniter plug is a core component of a high-energy capacitor discharge ignition system. It features an advanced shunted-gap or semiconductor tip design, which ensures a reliable spark even in the presence of the carbon and fuel fouling common in a turbine engine environment. As the certified Textron OEM part, it guarantees complete compatibility with the TFE731's ignition exciter and the demanding operational environment of the engine's hot section.

Key Features

• Genuine Textron Aviation / Honeywell OEM Part: Guarantees the part is the factory-specified and fully certified component, ensuring correct performance and airworthiness.

• High-Energy Ignition Design: Engineered to handle the high-amperage, short-duration pulse from a capacitor discharge exciter box, delivering a powerful spark measured in Joules.

• Shunted-Gap / Semiconductor Tip: The advanced tip design is inherently resistant to fouling from fuel and carbon deposits, providing exceptionally high ignition reliability compared to simple air-gap plugs.

• High-Purity Alumina Insulator: The main body insulator is made from a dense, high-purity alumina ceramic, providing superior dielectric strength to prevent high-voltage arcing at altitude.

• Designed for TFE731 Engines: Specifically engineered for the combustion chamber environment, pressures, and ignition system characteristics of the Honeywell TFE731 turbofan engine series.

• Robust Construction: Features a corrosion-resistant steel body and a nickel-alloy center electrode to withstand the extreme temperatures and pressures of the turbine engine hot section.

Technical Specifications

• Part Number: 3074541-4

• Component Type: Gas Turbine Engine Igniter Plug

• OEM Authority: Textron Aviation / Honeywell Aerospace

• Underlying Manufacturer (Typical): Champion Aerospace or Unison Industries, per Honeywell specification.

• Engine Application: Honeywell TFE731 Series (including, but not limited to, TFE731-3, -4, -5, and -20 variants).

• Technology: Shunted-Gap, High-Energy Capacitor Discharge

• Insulator Material: High-Purity Alumina Ceramic

• Governing Specification: Honeywell Aerospace / Textron Aviation Engineering Drawings.

Aircraft Compatibility

This OEM igniter plug is the specified component for the Honeywell TFE731 engines that power a wide range of Textron Aviation's most successful business jets.

• Primary Textron Aviation Platforms:

  • Cessna Citation III (650)

  • Cessna Citation VI (650)

  • Cessna Citation VII (650)

  • Hawker / Beechcraft 750, 800, 850XP, 900XP, 1000

Note: Verification of applicability is the absolute responsibility of the installer. The engine's current Illustrated Parts Catalog (IPC) for the specific engine serial number is the final authority for confirming part number eligibility.

Applications

• Sole Application: To produce a high-energy spark for the ignition of the fuel-air mixture in the combustion chamber of specified Honeywell TFE731 engines during ground or in-flight start sequences.

Why Choose 3074541-4?

Reliable engine ignition is a non-negotiable safety requirement. A failed start can lead to a costly "hot start" or "hung start," while the inability to perform an in-flight restart can be catastrophic. The genuine 3074541-4 OEM igniter is the only part guaranteed to be matched to the specific energy output of the TFE731's ignition exciter and to perform reliably within the unique aerodynamic and thermal environment of its combustor. The use of a non-approved part risks ignition failure, which can endanger the aircraft and lead to extremely expensive engine repairs.

The high reliability of the 3074541-4 igniter plug is primarily due to its shunted-gap semiconductor tip. Unlike a simple air-gap spark plug which can be rendered inoperative by a conductive carbon foul, the shunted-gap design features a proprietary semiconductor material that coats the insulator between the center electrode and the shell. This material has a specific, high resistance. When the ignition exciter delivers its high-voltage pulse, a small portion of the energy is allowed to "creep" across the surface of the semiconductor, which vaporizes and cleans away any liquid fuel or carbon deposits. This cleaning action clears a path for the main, high-energy spark to arc across the gap with maximum intensity. This self-cleaning, fouling-resistant characteristic ensures that a powerful spark is delivered every time, even in the fuel-rich environment of a cold engine start at altitude.

Note: This is a flight-critical, life-limited, or on-condition engine component. It is part of a high-voltage (lethal energy) ignition system. The ignition system must be de-energized and the exciter's capacitors allowed to bleed down for the time specified in the maintenance manual before servicing. Installation must be performed by a certified A&P mechanic in strict accordance with the Honeywell TFE731 maintenance manual. Igniter plugs are typically replaced as a set.

Documentation

All technical data, installation procedures, service limits, and safety precautions for this component are proprietary to Honeywell Aerospace and Textron Aviation. This information is contained within the official Maintenance Manual for the applicable TFE731 engine model.