Pneumatic, Air Conditioning, & Pressurization Flashcards
With the destination altitude below 7850’ when does the CABIN ALTITUDE CAS illuminate?
- Caution at 8500’
- Warning at 9400’
Flying into Telluride (KTEX) the CABIN ALTITUDE WARNING HIGH (A) CAS illuminates. How does this affect the CABIN ALTITUDE (C) and (W)?
- Increases Caution to Field Elevation +650’
- Increases Warning to Field Elevation +1550’
What is the IASC and how many are there?
Integrated Air System Controller
- Controls all pneumatics (Environmental and Anti-Ice) and leak monitoring
- 2 controllers, each with 2 channels
How many Outflow Valves are there?
1
Where is the Outflow Valve located?
Below the right wing leading edge, behind right landing light
How is the Outflow Valve opened and closed?
Electrically by servo motors
How many (pressurization) safety valves are installed and where are they located?
Two on the aft pressure bulkhead
What is the function of the (pressurization) safety valves?
To provide overpressure and negative pressure relief
Do the (pressurization) safety valves require electrical power to operate?
No, they are pneumatically operated and spring loaded closed
Does the environmental system use IP air or HP air?
IP (intermediate pressure) - regulated to 50 PSI
Most valves in the bleed and air conditioning system are controlled and actuated by?
Electrically controlled and Pneumatically actuated
What two valves are electrically actuated?
Outflow valve and avionics cooling valve
What does the Ozone Converter do?
Converts the Ozone from the IP bleed air into O2 to combat fatigue and dehydration
When the START switch is selected, what happens to the Flow Control Valves?
They automatically close to shut down the air conditioning system, allocating all bleed air to the Starter (ATS)
When does the ditching switch become active?
Below 15000’ the outflow valve opens on a depressurizing schedule. When pressurization delta P is zero, then the outflow valve closes to prevent water from entering.
What does Ram Air do?
Provides cooling air to the air heat exchangers and for cabin ventilation at low altitudes (unpressurized<10000’) if the pack and trim air fail or unpressurized flight is required
Is the Pack cold or hot air?
Cold Air
Is the Trim Air cold or hot air?
Hot Air
Pressing the EMER DEPRESS switch does what?
Cabin depressurizes at 2500 fpm to 14000’ in MAN Mode, 3000 fpm to 14500’ in AUTO Mode or aircraft altitude whichever is lower
How is temperature controlled in “AUTO”?
Ventilated temp sensors in the cockpit and cabin input to the IASCs to regulate set temperature
How is temperature controlled in “Manual”?
Direct control through IASCs to regulate temperature
The temperature “Pull Up/Pull Down” works under what conditions?
- APU or Pneumatic Cart
- Air Source = Normal
- Temp Mode = AUTO
- Main Cabin Door not closed
- more than 10 degrees difference between selected and indicated temp
How many modes of pressurization operation are there?
3 Total Modes
- 2 in “AUTO” through the IASCs
- 1 in “Manual” direct control of outflow valve via rate knob (max 3000 fpm)
Where do you find “X-BLEED” / “External Air Cart” start procedures?
QRH Volume 1 - Supplemental Section
How do you set landing altitude manually while in Auto Press mode?
Landing Alt outer knob to manual and inner knob to select altitude in 20ft increments (cyan indicator)
