UNISON 3061186-1 Ignition Exciter TX310

UNISON 3061186-1 Ignition Exciter TX310 for Aircraft Gas Turbine Engines

The UNISON 3061186-1 (Model TX310) is a capacitive-discharge aircraft turbine ignition exciter unit designed for Honeywell TFE731 series turbofan propulsion systems. Operating under ATA Chapter 74 (Ignition), this exciter converts low-voltage aircraft DC bus power into high-voltage, high-energy electrical pulses to ionize the igniter plug gap across all ground-start and high-altitude relight envelopes.

The TX310 unit withstands continuous high-frequency engine vibration, rapid thermal cycling, and extreme altitude pressure differentials without dielectric breakdown or output energy degradation.

Model Details

• Manufacturer Part Number (MPN): 3061186-1
• Unison OEM Part Number: 9060280-1
• Model Designation: TX310
• CAGE Code: 59501 (Unison Industries, LLC)
• ATA Chapter / System Code: 74-10-00 (Ignition Electrical Power Supply)
• Component Classification: On-Condition (O/C) Turbine Accessory

Technical Details

Features

1. Consistent Ionization Across Altitude Envelopes: Incorporates hermetically sealed gas-filled spark gap switching tubes stabilized with trace Krypton-85 to ensure repeatable breakdown voltages during cold-soaked ground starts and thin-air windmill relights.
2. Ruggedized Turbine-Case Enclosure: Hermetically sealed metallic housing protects internal storage capacitors, step-up transformers, and discharge circuits from moisture ingress, turbine oil mist, and acoustic vibration.
3. EMI/RFI Shielded Architecture: Built-in input filtering and shielded coaxial output interfaces prevent high-voltage discharge transients from interfering with FADEC, DEEC, and cockpit avionics buses.
4. Dual-OEM Part Traceability: Manufactured by Unison Industries under dual Honeywell/Unison part numbering (3061186-1 / 9060280-1), ensuring direct drop-in mechanical and electrical interchangeability.
5. On-Condition Serviceability: Designed for extended service life without fixed hourly overhaul limits when operated within specified duty-cycle cooling parameters.

Compatible Turbine Engines

• Honeywell TFE731 Series Turbofans (including TFE731-20BR-1B and related dash variants utilizing the 3061186-1 / 9060280-1 ignition configuration)

Airframe & Propulsion Applications

• Business & Corporate Aviation: Learjet 40 / Learjet 45 series aircraft equipped with TFE731-20 powerplants.
• Primary Engine Light-Off: Supplies initial spark energy to combustion chamber igniter plugs during ground start sequences.
• In-Flight Relight & Continuous Ignition: Provides continuous high-energy pulsing during severe turbulence, heavy precipitation, or icing encounters to prevent flameout.

Frequently Asked Questions

Are part numbers 3061186-1 and 9060280-1 interchangeable?

Yes. Part number 3061186-1 is the Honeywell Aerospace engine-level part number, while 9060280-1 is the corresponding OEM part number assigned by Unison Industries for the exact same TX310 ignition exciter assembly. Both part numbers are functionally and physically identical and cross-reference directly in illustrated parts catalogs.

Which aircraft and engines use the UNISON 3061186-1 ignition exciter?

The UNISON 3061186-1 is installed on Honeywell TFE731 series turbofan engines, notably the TFE731-20BR-1B powerplants used on Learjet 40 and Learjet 45 business jets. Always verify exact dash-number applicability against your aircraft’s current Engine Illustrated Parts Catalog (EIPC).

Does the UNISON TX310 ignition exciter require special hazardous materials shipping?

Yes, under excepted package rules. The internal spark gap switching tube contains a trace amount of radioactive Krypton-85 gas to stabilize ionization across varying altitudes. It ships under UN2911 (Radioactive Material, Excepted Package – Instruments) with external radiation levels well below 0.5 mrem/hr, meaning it moves safely via standard air freight with proper excepted-package labeling.

What airworthiness documentation comes with an overhauled 3061186-1 unit?

Certified overhauled or serviceable units are accompanied by an FAA Form 8130-3, EASA Form 1 (or Dual Release), a repair station teardown/test report, and full traceability documentation confirming repair in accordance with the OEM Component Maintenance Manual.

What is the scheduled overhaul interval for the 3061186-1 exciter?

The 3061186-1 ignition exciter is an On-Condition (O/C) component. It has no hard-time life limit and remains in service as long as it passes scheduled visual inspections, connector integrity checks, and functional ignition system checks during routine engine maintenance.