SYS: Envirolmental, Bleed Air, Conditioning, Pressurerization and Emergency Oxygen Flashcards
The enviromental system consists of:
1: An engine bleed air and conditioning system
2: The ventilating air system
3: An Air Conditioning system
4: The cabin air distribution system
5: The pressurization and control system
Where does the air for heating the cabin and for pressurization come from?
Compressor bleed air from the P3 engine port.
What happens to the bleed air when it leave P3?
It is routed through a mass flow controller that mixes ambient and bleed air, then the air flow is split between a heat exchanger and muffler. The amount of air flowing through each component is dependet on the cabin air temperature setting.
Cabin air conditioning is provided by?
A Vapor cycle system. The compressor is belt driven by the engine Dual drive.
How does the condenser and it’s cooling air fan work?
Cooling air from outside the tailcone is drawn into the cooling air duct through a flash opening in the skin, routed across the condenser coil, and dicharged overboard through the tailcone exit opening.
Can the recirculation blowers be operated independently of the air condition?
Yes. By selecting the blower HI or LO.
The cabin pressurization control system consist of?
1: Isobaric outflow valve
2: A safety outflow valve
3: Absolute pressure regulator
4: Cabin altitude and rate selector
5: Electrically operated vacuum solenoid valve
6: Surge tank
Cabin pressure is automatically regulated to a maximum of?
5.5 psi
The cabin safety valve will maintian a maximum of?
5.6, in case of cabin outflow valve malfunction
What prevents the cabin from being pressurized while on the ground?
The landing gear squat switch and vacuum pressure.
CAS Message
Amber CABIN ALT:
White EMER BLEED ON:
Red CABIN ALT:
CAS Message
Amber CABIN ALT: Cabin pressure exceed 10.000 ft
White EMER BLEED ON: When emergency bleed air solenoid is open (12.000 ft)
Red CABIN ALT: Cabin pressure exceed 12.000 ft
In case the cabin altitude exceed 13.500 ft, what happens?
The absolute pressure regulator will close the isobaric outflow valve. The isobaric outflow valve provides the means by which smoke and impurities are vented from the cabin.
EMER OXYGEN SYS
System charged to 800 psi and normal setting:
System charged to 1800 psi and normal setting:
Will provide oxygen for?
System charged to 800 psi and normal setting:
EMER Descent from 30.000 ft to 10.000 ft. 15 min descent profile. 1 min dwell time, a 5.000 fpm descent to 10.000 ft, 10 min hold at 10.000 ft.
System charged to 1800 psi and normal setting:
25 min. At 30.000 ft.
Emergency oxygen system for all occupants provide oxygen for how Long?
15 min.
If the emergency oxygen system has been used, what CAS message will the pilot receive?
a white OXYGEN on ground and amber OXYGEN while in flight.
