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

What radios can the Backup Tuning Unit (if installed) tune?

1. Com 1 and Nav 1

2. Com 2 and Nav 2

3. Com 1 and Com 2

4. Nav 1 and Nav 2

The correct answer is: Com 1 and Nav 1

The Backup Tuning Unit (BTU) in the PSA Airlines Canadair Regional Jet Systems is designed to provide redundancy for critical communication and navigation systems. It is an emergency control device that allows the flight crew to tune into the primary communication (Com) and navigation (Nav) frequencies. When installed, the BTU can specifically tune to Com 1 and Nav 1. This design ensures that if the primary systems experience a failure or malfunction, the flight crew can still maintain effective communication with air traffic control and navigate accurately using the most important and often utilized frequencies. Thus, the ability of the Backup Tuning Unit to directly interface with Com 1 and Nav 1 enhances the safety and reliability of the aircraft's operations during critical phases of flight. By focusing on these two essential systems, the BTU provides crucial operational capability when it is most needed.