AC, Pressurisation & Ventilation Flashcards
What’s the mixer temp range
18-30 degrees. 24 degrees at 12 o’clock
What controls the packs l?
ACSC 1 cockpit and ACSC 2 cabin.
What 3 conditions cause pack flow to be higher?
Single pack
APU Bleed Use
Demand not satisfied
What happens to packs at engine start?
Close for 30 seconds when switch moved to ignition
When does the PACK ram air inlet flap open and close automatically?
Open - 20 seconds after speed drops below 70kts
Closes - take off and landing
What happens if RAM Air pb is on?
Valve opens if delta P is less than 1 psi and ditching pb is normal.
What happens if the ACSCs have a double lane failure
The related pack is lost and the hot air pressure-regulating valve closes. Associated trim air valves remain at the position they were at the time of failure.
Outflow valve position after landing?
Fully open after 55s
Max cabin alt, delta p?
8000ft
9psi (safety activates at 9
8.6) / -1 PSI
How many motors for the outflow valve?
2 electrical and 1 manual
If pilots suspect CPC is malfunctioning, how cab CPC be changed manually?
Press MAN pb for 10 secs then back to auto
When will the CAB PR LDG ELEV fault.trigger?
If delta p is 1.5 in phase 7. Adjust landing elevation and ig unsuccessful take manual control.
What does the ditching switch do?
Sends a close signal to the outflow valve, emergency ram air inlet, avionics ventilating inlet and extract valves and pack flow control valves.
What av vent config is in operation
High temps on ground
Low temps on ground
Low temps in air
High temps in air
Open
Closed
Closed
Intermediate
What happens when the blower and extract are both selected to override?
verify
