Leap 1 A propulsion control FADEC | EIU | EEC

About this Video

• Video Title: Leap 1 A propulsion control FADEC | EIU | EEC
• Channel: Hangar
• Speakers: (Not specified in transcript)
• Duration: 00:07:27

Introduction

This video explains the propulsion control system of the Leap 1A engine, focusing on the Engine Interface Unit (EIU), Full Authority Digital Engine Control (FADEC) system, power management, engine limit protection, and engine system controls (including starting and ignition). The video breaks down the components and their functions within the system.

Key Takeaways

• Propulsion Control System Components: The system comprises the Engine Interface Unit (EIU), the FADEC system (including two Electronic Engine Control Units (EECs) and a Pressure Subsystem (PSS)), and various sensors.
• EIU Function: The EIU acts as an interface between the aircraft and the engines, segregating engine and aircraft electrical power supplies to the FADEC. It also handles data communication between the cockpit and the engines for maintenance purposes.
• FADEC System Operation: The FADEC system uses two EECs (A and B), with one active and the other in standby. It manages engine thrust, optimizes performance using air data parameters, and offers manual and automatic thrust modes. The PSS provides pressure data to the EECs.
• Engine Limit Protection: The FADEC system incorporates hardware and software limits to prevent engine over-boosting and overspeed, protecting parameters such as fan speed, core speed, fuel flow, and combustor pressure. It also includes a Thrust Control Malfunction Accommodation (TCMA) logic.
• Engine System Controls: The FADEC controls the engine start sequence (automatic or manual), monitors critical parameters to abort or recycle starts if necessary, and manages various engine functions such as fuel flow, airflow, and thermal management.