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Questions and Answers
What happens to the trim air pressure regulating valve when the solenoid is de-energized?
What happens to the trim air pressure regulating valve when the solenoid is de-energized?
- The valve closes due to a spring mechanism (correct)
- The valve opens due to spring force
- The valve remains open until manually closed
- The valve position is uncontrolled
How does the trim air pressure regulating valve open?
How does the trim air pressure regulating valve open?
- By manual adjustment of the valve position
- Due to external electrical signals from the cockpit
- When the solenoid is energized, allowing air pressure to act (correct)
- Through the action of cabin temperature changes
What is the primary function of the trim air pressure regulating valve?
What is the primary function of the trim air pressure regulating valve?
- To monitor changes in cabin temperature
- To create cabin pressure
- To disconnect the pneumatic system
- To regulate downstream pressure above cabin pressure (correct)
What component monitors the position of the trim air pressure regulating valve?
What component monitors the position of the trim air pressure regulating valve?
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The downstream pressure regulated by the trim air pressure regulating valve is dependent on what factor?
The downstream pressure regulated by the trim air pressure regulating valve is dependent on what factor?
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Study Notes
Trim Air Pressure Regulating Valve
- The trim air pressure regulating valve is operated by a solenoid and air pressure.
- The valve is closed by a spring when the solenoid is de-energized.
- When the solenoid is energized, the valve opens due to air pressure from the pneumatic system.
- The valve regulates downstream pressure, typically 4 psi above cabin pressure.
- The specific pressure value varies between aircraft types.
- The valve position is constantly monitored by the zone controller using a limit switch.
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