How many TRUs are present on the CRJ-700/900, and what is their power rating?

The CRJ-700 and CRJ-900 aircraft are equipped with four Transformer Rectifier Units (TRUs), and each of these TRUs has a power rating of 120 Amps. TRUs play a crucial role in the aircraft's electrical system by converting higher voltage AC power from the engine generators into lower voltage DC power that can be used by the aircraft's systems. The choice of four TRUs ensures redundancy, which is vital for maintaining reliable power distribution throughout the aircraft. Should one TRU fail, the remaining units can continue to supply necessary electrical power, enhancing the overall safety and operational integrity of the aircraft.

Understanding the specifications of the TRUs, including their number and power rating, is essential for maintenance personnel and flight crews to ensure proper operation and troubleshooting of the electrical systems within the CRJ aircraft.