PNEUMATIC, AIR CONDITIONING, AND PRESSURIZATION

Question 1

Sources of pressurized air available for the air conditioning/environmental system include: _____.

Answer 1

Engine bleed, APU bleed, and external air cart

Question 2

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

Answer 2

-8500

-9400

Question 3

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 _____.

Answer 3

-increasing to Field Elevation +650 ft

-increasing to Field Elevation +1,550 ft

Question 4

The IASCs are _____ and they number _____.

Answer 4

-Integrated Air System Controllers which control all pneumatics (Environmental and Anti-ice) and leak monitoring

-two—2 controllers each with 2 channels

Question 5

There is/are _____ total outflow valve(s) installed, located _____

Answer 5

-one

-below the right-wing leading edge, behind
the right landing light

Question 6

An outflow valve is opened and closed _____.

Answer 6

electrically, via servo motors

Question 7

There are _____ total safety valve(s) installed, located _____

Answer 7

-two

-on the aft pressure bulkhead

Question 8

The function of a safety valve is to _____.

Answer 8

provide overpressure and negative pressure
relief

Question 9

Do safety valves require electrical power to operate?

Answer 9

No, they are pneumatically operated and
spring-loaded closed.

Question 10

Does the environmental system use intermediate-pressure (IP) air or high-pressure (HP) air?

Answer 10

IP, regulated to ~50 PSI.

Question 11

Most valves in the bleed and air conditioning system are _____ controlled and _____ actuated.

Answer 11

-electrically

-pneumatically

Question 12

Two valves which are electrically actuated are the _____ valve and _____ valve.

Answer 12

-outflow

-avionics cooling

Question 13

4 Conditions which cause the IP bleed valves to be closed include: _____.

Answer 13

-Fire switch PBA
-Loss of bleed pressure to valve
-Electrical power loss to valve
-Engine start

Question 14

The Ozone Converter functions to _____.

Answer 14

convert the ozone from the IP bleed air into oxygen to combat fatigue and dehydration

Question 15

When the START switch is selected, the Flow Control Valves _____.

Answer 15

automatically close to shut down the air conditioning system, allocating all bleed air to the engine starter (ATS)

Question 16

The ditching switch becomes active when _____.

Answer 16

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

Question 17

Ram Air functions to provide _____

Answer 17

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

Question 18

Is the trim air cold or hot air?

Answer 18

Hot air

Question 19

Is the pack air cold or hot air?

Answer 19

Cold air.

Question 20

Pressing the Emer Depress switch in AUTO mode results in _____.

Answer 20

cabin depressurization at 2,500 fpm to
14,000 ft ± 100 ft or aircraft altitude, whichever is lower

Question 21

Pressing the Emer Depress switch in MANUAL (MAN) mode results in _____.

Answer 21

cabin depressurization at 3,000 fpm to
14,500 ft ± 500 ft or aircraft altitude, whichever is lower

Question 22

Temperature is controlled in AUTO via _____.

Answer 22

ventilated temp sensors in the cockpit and cabin input to the IASCs to regulate a set temperature

Question 23

Temperature is controlled in MANUAL _____.

Answer 23

directly through the IASCs

Question 24

The temperature Pull Up/Pull Down works under the following conditions: _____.

Answer 24

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.)

Question 25

There are _____ total modes of pressurization operation, including: _____.

Answer 25

-three

-2 in AUTO through IASCs #1 and #2

-1in MANUAL direct control of outflow valve via rate knob (maximum 3,000 fpm)

Question 26

When an external air cart is being used, indications include: _____.

Answer 26

ECS and summary pages indicate bleed pressure in the right and left side of the manifold

no green “flow lines”

Question 27

The X-Bleed/External Air Cart start procedures are located in _____.

Answer 27

QRH Volume 1—Supplemental Data tab, S-51-1

Question 28

While in Auto Press mode, set landing altitude manually by setting _____.

Answer 28

landing alt outer knob to manual and inner knob to select alt in 20 ft increments (cyan indication)