PSA Airlines Canadair Regional Jet Systems (PSA-CRJ) Practice Exam

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Prepare for the PSA Airlines Canadair Regional Jet Systems Exam. Study with comprehensive flashcards and multiple choice questions, each with hints and explanations. Get ready to excel!

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A fault resulting in the loss of AC Bus 1 will affect how many TRUs?

  1. No TRUs

  2. 1 TRU

  3. 2 TRUs

  4. 3 TRUs

The correct answer is: 1 TRU

The loss of AC Bus 1 affects one TRU, specifically the TRU that is powered directly by AC Bus 1. Each TRU (Transformers Rectifier Unit) is responsible for converting AC power from the aircraft's buses into the DC power needed for various systems and equipment. When AC Bus 1 fails, the TRU associated with that bus will also fail, resulting in the loss of DC power generated by that unit. In the case of the CRJ systems, each AC bus is connected to specific TRUs, and losing one bus leads to a direct impact on its corresponding TRU. Understanding the configuration and relationship between buses and TRUs is crucial for diagnosing electrical power issues and executing proper system management in-flight. Thus, the training on this subject underscores the importance of recognizing how many TRUs will be affected by a failure in the AC system.