PNEUMATIC, AIR CONDITIONING, AND PRESSURIZATION Flashcards
Sources of pressurized air available for the air conditioning/environmental system include: _____.
Engine bleed, APU bleed, and external air cart
With the destination altitude below 7,850 ft, the CABIN ALTITUDE caution (amber) CAS message illuminates at _____ ft and the CABIN ALTITUDE warning (red) message illuminates at _____ ft
-8500
-9400
Flying into Telluride (KTEX; airport elevation above 7,850 ft) the CABIN ALTITUDE WARNING HIGH (advisory) CAS message illuminates. This affects the CABIN ALTITUDE (caution) by _____ and the CABIN ALTITUDE (warning) by _____.
-increasing to Field Elevation +650 ft
-increasing to Field Elevation +1,550 ft
The IASCs are _____ and they number _____.
-Integrated Air System Controllers which control all pneumatics (Environmental and Anti-ice) and leak monitoring
-two—2 controllers each with 2 channels
There is/are _____ total outflow valve(s) installed, located _____
-one
-below the right-wing leading edge, behind
the right landing light
An outflow valve is opened and closed _____.
electrically, via servo motors
There are _____ total safety valve(s) installed, located _____
-two
-on the aft pressure bulkhead
The function of a safety valve is to _____.
provide overpressure and negative pressure
relief
Do safety valves require electrical power to operate?
No, they are pneumatically operated and
spring-loaded closed.
Does the environmental system use intermediate-pressure (IP) air or high-pressure (HP) air?
IP, regulated to ~50 PSI.
Most valves in the bleed and air conditioning system are _____ controlled and _____ actuated.
-electrically
-pneumatically
Two valves which are electrically actuated are the _____ valve and _____ valve.
-outflow
-avionics cooling
4 Conditions which cause the IP bleed valves to be closed include: _____.
-Fire switch PBA
-Loss of bleed pressure to valve
-Electrical power loss to valve
-Engine start
The Ozone Converter functions to _____.
convert the ozone from the IP bleed air into oxygen to combat fatigue and dehydration
When the START switch is selected, the Flow Control Valves _____.
automatically close to shut down the air conditioning system, allocating all bleed air to the engine starter (ATS)
The ditching switch becomes active when _____.
below 15,000 ft—the outflow valve opens on a depressurizing schedule. When pressurization delta P is 0 (zero), then the outflow valve closes to prevent water from entering
Ram Air functions to provide _____
cooling air to the heat exchangers as well as cabin ventilation at low altitudes (unpressurized <10,000) if the pack and trim air fail or unpressurized flight is required
Is the trim air cold or hot air?
Hot air
Is the pack air cold or hot air?
Cold air.
Pressing the Emer Depress switch in AUTO mode results in _____.
cabin depressurization at 2,500 fpm to
14,000 ft ± 100 ft or aircraft altitude, whichever is lower
Pressing the Emer Depress switch in MANUAL (MAN) mode results in _____.
cabin depressurization at 3,000 fpm to
14,500 ft ± 500 ft or aircraft altitude, whichever is lower
Temperature is controlled in AUTO via _____.
ventilated temp sensors in the cockpit and cabin input to the IASCs to regulate a set temperature
Temperature is controlled in MANUAL _____.
directly through the IASCs
The temperature Pull Up/Pull Down works under the following conditions: _____.
APU or pneumatic cart air pressure is
available, air source = normal, temp mode = AUTO,
main cabin door not closed
more than 10° difference between selected and indicated temperature (Increases flow to heat or cool faster. Increased noise and too much flow in cockpit usually.)
There are _____ total modes of pressurization operation, including: _____.
-three
-2 in AUTO through IASCs #1 and #2
-1in MANUAL direct control of outflow valve via rate knob (maximum 3,000 fpm)
When an external air cart is being used, indications include: _____.
ECS and summary pages indicate bleed pressure in the right and left side of the manifold
no green “flow lines”
The X-Bleed/External Air Cart start procedures are located in _____.
QRH Volume 1—Supplemental Data tab, S-51-1
While in Auto Press mode, set landing altitude manually by setting _____.
landing alt outer knob to manual and inner knob to select alt in 20 ft increments (cyan indication)
