CH34187A – Champion Aerospace GA Turbine Engine Igniter for Allison Model 250
Available now on the Airparts.aero Marketplace.
Overview
The Champion Aerospace CH34187A is a high-performance turbine engine igniter, specifically engineered for the rigorous demands of the Rolls-Royce / Allison Model 250 series of turboshaft and turboprop engines. This igniter is a flight-critical component that delivers the high-energy spark required to initiate combustion of the fuel-air mixture during engine start. Featuring advanced material science and a robust sealing design, the CH34187A is built by the industry leader in aerospace ignition systems to provide reliable light-off, long service life, and resistance to the extreme temperatures and pressures found within a turbine engine's combustor section.
Key Features
- High-Energy Spark Delivery: Designed to function with a high-energy exciter box, this igniter plug produces a powerful, high-temperature spark capable of reliably igniting atomized jet fuel, even in sub-optimal temperature and altitude conditions.
- Advanced Insulator Design: Utilizes a proprietary ceramic insulator that provides superior dielectric strength to prevent voltage leakage and flashover at high altitudes, while also offering excellent thermal shock resistance.
- Corrosion & Seize Resistance: The igniter body features a silver-plated shell, which provides exceptional protection against corrosion and prevents seizing within the combustor case threads, ensuring easier installation and removal during maintenance.
- Hermetic Sealing: Incorporates advanced glass and mechanical sealing features. This hermetic seal prevents the leakage of high-pressure combustion gases past the igniter, protecting sensitive ignition lead components and ensuring engine performance.
- Thermal Barrier Coatings: Employs external wear and thermal barrier coatings to protect the life-limiting features of the igniter tip from the extreme thermal distress and erosive environment of the combustion chamber.
Technical Specifications
- Part Number: CH34187A
- Component Type: Turbine Engine Igniter Plug
- Primary Engine Application: Rolls-Royce / Allison Model 250 Series
- Shell Material: Steel with Silver Plating
- Insulator Material: High-Purity Alumina Ceramic
- Firing End: Solid Electrode, Surface Gap Design
- Certification: FAA-PMA Approved
Aircraft Compatibility
The Champion CH34187A is the specified OEM or FAA-PMA approved igniter for a vast fleet of helicopters and fixed-wing aircraft powered by the ubiquitous Rolls-Royce / Allison 250 turbine engine. It is crucial to consult the specific engine's Illustrated Parts Catalog (IPC) for final verification.
- Common Helicopter Models:
- Bell: 206 JetRanger, 206L LongRanger, 407, OH-58 Kiowa
- MD Helicopters: MD 500, MD 520N, MD 600N
- Eurocopter (Airbus): AS355
- Enstrom: 480
- Sikorsky: S-76
- Common Fixed-Wing Models:
- Britten-Norman: BN-2T Turbine Islander
- Various turboprop conversions (e.g., Cessna P210 Silver Eagle)
Applications
The CH34187A has a singular, flight-critical application:
- Engine Ignition: Serves as the final component in the ignition system, delivering the spark from the exciter and ignition lead directly into the engine's combustor can to initiate light-off during the start sequence.
- Scheduled Maintenance Item: A consumable component that is inspected and replaced at specified service intervals to ensure continued ignition system reliability.
Why Choose CH34187A?
A reliable engine start is critical for every mission, especially for helicopter operators. The Champion CH34187A is engineered with the material science and robust design necessary to perform reliably in the violent environment of a turbine engine combustor. Choosing a genuine Champion Aerospace igniter guarantees you are installing a component with a known service life, certified performance, and the advanced features required to prevent common failure modes like gas leakage and high-altitude flashover. For a component this vital to engine operation, there is no substitute for the world's leading ignition system manufacturer.
Order Your CH34187A Igniters Now
Ensure reliable starts and protect your engine with the industry standard in turbine ignition. Visit Airparts.aero to order your Champion Aerospace CH34187A igniters today.
The CH34187A operates as a surface-gap igniter. Unlike a piston engine spark plug that has a small, precise air gap, a turbine igniter's electrodes are separated by a semiconductor material. The high-energy (measured in Joules) capacitor discharge from the exciter box ionizes this semiconductor, creating a conductive path for a massive, high-current spark to flash across the igniter's tip. This large, powerful spark is necessary to ignite the relatively lean, high-velocity fuel-air mixture present in a turbine combustor during startup. The design is self-cleaning and highly resistant to the fouling from carbon and fuel deposits that would render a traditional air-gap plug inoperative.
