Pressurisation Flashcards
Maximum Cabin Differential
6.8psi
Pressure Relief Setting
6.7 (+/-0.1)psi
Environmental System Components
Two Firewall (Bleed Air) Shutoff Valves Environmental Control Unit (ECU) Cabin Pressure Control System Electrically Operated Temperature Control System Windshield and Side Window Defog System Bleed Air Leak Detection System
Bleed Air Valves Operation
Solenoid Controlled, Pneumatically Operated
Require Bleed Air Output to Open (Automatically Closed When Engine Not Running)
Check Valve in Each Line Prevents Back Flow
Envir Master Switch Function
Controls ECU Pressure Regulator and Shutoff Valve
Shutoff Valve Requires Bleed Air Pressure to Function (Defaults to Full Open, Regardless of Switch Position, With No Pressure)
Cabin Depress Switch
Controls Depressurisation (Outflow) Valve and Electrically Operated Vacuum Pump
Temperature Control Mixing Valve Actuation Time
40 Seconds from Full Open to Full Closed
Bleed Air Leak Detection System Number of Sensors
Six
Bleed Air Leak Detection Activation Temperature
300(+/-8) Degrees Fahrenheit
Deactivates at 270(+/-6) Degrees Fahrenheit
Cabin Valve Types/Location/Number
Two Combination Outflow/Safety Valves (Forward Pressure Bulkhead) for Pressure Control and Overpressure Protection
Ram Air Check Valves (Forward Pressure Bulkhead) for Negative Pressure Protection and Ram Air Ventilation During Unpressurised Flight (Held Closed by Positive Cabin Pressure
Cabin Alt Annunciator Operation
Cabin Altitude >11,000(+/-500)ft
Aural Warning Horn (Can be Silenced by Horn Cutout)
Oxygen System Storage Capacity
22cu.ft at 1800psi
Oxygen System Minimum Functioning Pressure
300psi
Oxygen System Recommended Pressure
1500 - 1800psi
Oxygen System Provision
200LPM at Regulated 55-80psi
