2 - Air Systems Flashcards
If you get the PACK light due to a overheat of the affected pack, what will be done.
Select a warmer temperature to lower the the workload of the selected pack before reseting it
When does the isolation valve open during auto-operation
If either pack or engine bleed is turned off
A ZONE TEMP light indicates what
A duct overheat
What does the BLEED TRIP OFF light indicate, and what will happen
An excessive bleed air pressure or temperature. The bleed air valve will close (
In an non engine bleed take-off, with an engine failure, when should the bleed air be selected back on
Reaching 1,500 feet AGL, or obstacle clearance height
How are the engine bleed valves activated and powered
DC activated, pneumatically activated
When will you get an “off schedule descent” light. What is it purpose
If you start a descent before the set cruise altitude. The purpose is to return to the departure airport
Engine bleed air is obtained from where?
5th and 9th compressor stages
What is the maximum pressure before the safety valve operates.
9.10psi
If you get a PACK light during master caution recall, what does this indicate?
A failure of one of the pack controllers
When the pressurization is set to manual, what controls the outflow valve.
With the toggle in the flight deck, which controls the outflow valve, via a motor connected to the DC standby bus
When does the DUAL BLEED valve illuminate. Why?
When the APU bleed air valve is open, with an engine bleed valve also open and connected. To warn you that you can backpressure the APU bleed air (with engine power above idle)
When does the pilot oxygen mask automatically use pressure breathing.
Above 27,000 feet
When will the equipment cooling exhaust valve open in flight?
With low differential pressures, or:
With one of the packs set to high, and the right circulation fan off. To help with increased ventilation in smoke removal
When is the descent mode activated in the pressure controller
When the aircraft descends more than 0.25psi below the selected FLT ALT
