What type of communication systems are installed in the ERJ-145?

The ERJ-145 is equipped with VHF (Very High Frequency) communication systems and ACARS (Aircraft Communications Addressing and Reporting System). VHF communication is standard in commercial aviation for voice communication with air traffic control and other aircraft, due to its reliable range and clarity. The integration of ACARS enhances communication by allowing automatic data transmission between the aircraft and ground stations, enabling more efficient flight monitoring, maintenance reporting, and operational communications.

This dual system is essential for ensuring robust communication capabilities necessary for safe and efficient operation during various phases of flight. The other options do not represent the complete or accurate communication systems installed in the ERJ-145. HF communication is generally used for longer ranges but is not the primary means of communication for this particular aircraft, while satellite communication systems, although advanced, are not standard equipment on the ERJ-145. Similarly, infrared (IR) communication systems are uncommon in commercial aviation applications for real-time voice communication, which reinforces why option A stands out as the correct choice.