Lamar TE04 MASTER CONTROL UNIT TEST SET

The **Lamar TE04 Master Control Unit (MCU) Test Set** (P/N **TE04**) is specialised electrical test equipment developed for troubleshooting and verifying the operation of Master Control Units and related electrical components in applicable Cessna aircraft. The TE04 supports both **on-aircraft and bench testing**, allowing maintenance personnel to investigate electrical system faults and evaluate MCU functions. It can be used to check battery relay operation, alternator control functions, electrical bus circuits and associated warning indications. The test set incorporates switches, indicator lights, test jacks and connection harnesses to support systematic electrical testing in accordance with Lamar's published instructions. --- ## Applications The TE04 is identified for testing and troubleshooting electrical power systems on the following Cessna aircraft: - **Cessna 172 Series** – 172R, 172S - **Cessna 182 Series** – 182S, 182T, T182T - **Cessna 206 Series** – 206H, T206H **Maintenance Applications:** - Master Control Unit (MCU) functional testing - Aircraft electrical system troubleshooting - Alternator Control Unit (ACU) testing - Battery and alternator relay circuit checks - Low-voltage annunciation testing - Overvoltage protection circuit testing - Alternator field and feeder circuit troubleshooting - Electrical bus and current sensor checks --- ## Why CJ Aerospace? CJ Aerospace supplies aircraft electrical components, generator control units and electrical test equipment for a range of aviation maintenance applications. Our team can assist with product information, availability and part-number identification. - 🇦🇺 **Australian-owned and operated** - 📦 **Aircraft electrical components and test equipment** - 🔧 **Technical assistance with part identification and compatibility** - ✈️ **Support for aircraft owners, operators and aviation professionals** > ✉️ [Contact us at sales@cjaerospace.com.au](mailto:sales@cjaerospace.com.au) > Need help identifying the correct aircraft electrical test equipment? Contact our team for assistance.

- **MCU Functional Testing** – Supports troubleshooting and verification of Master Control Unit functions - **On-Aircraft and Bench Testing** – Provides procedures for testing installed or removed MCUs - **Alternator Control Testing** – Supports voltage regulation, overvoltage protection and alternator field circuit checks - **Electrical Circuit Monitoring** – Includes indicator lights for monitoring electrical system conditions - **Low-Voltage Testing** – Supports verification of low-voltage annunciation operation - **Relay and Bus Circuit Checks** – Assists with battery relay, alternator relay and electrical bus troubleshooting - **Integrated Test Connections** – Includes test jacks and connection harnesses for applicable MCU installations - **Documented Test Procedures** – Supported by Lamar's TE04 MCU Test Set instruction manual