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

How can one switch from the active to standby pressure controller on the ECS page?

1. By pressing the PRESS CONT switch once

2. By pressing the PRESS CONT switch lights twice

3. By toggling the control knob

4. By resetting the system

The correct answer is: By pressing the PRESS CONT switch lights twice

Switching from the active to standby pressure controller on the ECS (Environmental Control System) page is done by pressing the PRESS CONT switch lights twice. This action specifically indicates to the system that the operator desires to switch control between the active and standby modes. In practice, when the PRESS CONT switch is pressed once, it may only acknowledge a request or confirm a setting rather than switch the modes. Toggling the control knob is generally associated with adjusting settings rather than switching the controllers. Additionally, resetting the system is a more drastic action that would typically disrupt the current settings rather than smoothly transitioning between controllers. Thus, the requirement for two presses ensures clarity in the intention of switching controls while maintaining system stability.