SELF-CHECK 5 / PRESSURIZATION/ENVIRONMENTAL/PNEUMATICS (Ch. 21)

Question 1

What is the source of bleed air for the ECS system?

A. Left engine
B. Right engine
C. APU
D. All of the above

Answer 1

D. All of the above.

Question 2

The ECS system uses bleed air for ________?

A. Pressurization
B. Air conditioning
C. Both A and B
D. None of the above

Answer 2

C. Both A and B.

Question 3

During ground operations, the _______ position on the ECS selector knob provides maximum cooling capacity.

A. BOTH ENGINES
B. EMER
C. RAM
D. APU

Answer 3

D. APU.

Question 4

The bleed air system is protected by twoovertemperature switches and one overpressure switch. These switches send indications to the EICAS. At what temperature/pressure will the crew receive a warning
CAS message?

A. 500ºF and 50 PSI
B. 550ºF and 45 PSI
C. 550ºF and 50 PSI
D. 500ºF and 45 PSI

Answer 4

C. 550ºF and 50 PSI.

Question 5

Which engine does supplies low pressure bleed air for the G200 emergency pressurization system?

A. Left
B. Right
C. Both left and right
D. APU

Answer 5

B. Right .

Question 6

How many heat exchangers are installed in the G200 environmental control system?

A. One
B. Two
C. Three
D. Four

Answer 6

C. Three.

Question 7

_______ is the minimum settable field elevation?

A. -2,000 feet
B. -1,000 feet
C. Sea Level
D. 1,000 feet

Answer 7

B. -1,000 feet.

Question 8

With the cabin altitude MODE SEL pushbutton in MAN (manual) mode, what is the maximum rate of change?

A. 6,000 fpm
B. 7,000 fpm
C. 8,000 fpm
D. 9,000 fpm

Answer 8

C. 8,000 fpm.

Question 9

With the cabin altitude MODE SEL pushbutton in MAN (manual) mode, cabin altitude is limited to _______.

A. 14,000 ± 500 feet
B. 12,500 feet
C. 10,000 feet
D. No limit

Answer 9

A. 14,000 ± 500 feet

Question 10

With the FIELD ELEV selector in AUTO mode, what is the maximum landing fi eld elevation?

A. 10,000 feet
B. 11,000 feet
C. 12,000 feet
D. 14,000 feet

Answer 10

D. 14,000 feet.

Question 11

Pressing the Dump pushbutton ___________?

A. Dumps the auto lavatory
B. Dumps fuel
C. Opens the outflow valve, causing the cabin altitude to climb
D. None of the above

Answer 11

C. Opens the outflow valve, causing the cabin altitude to climb.

Question 12

Pressing the Ditch pushbutton ______________?

A. Opens the outflow valve
B. Opens the safety relief valve
C. Both A and B
D. Closes the outflow valve to keep water out

Answer 12

D. Closes the outflow valve to keep water out.

Question 13

Is interior temperature controllable with the ESC Selector in the RAM position?

A. Yes
B. No

Answer 13

B. No.

Question 14

Placing the PILOT AIR COND switch in the INCRS position __________?

A. Increases conditioned air flow to the cockpit foot warmers
B. Increases conditioned air flow to the cockpit side outlets
C. Both A and B
D. None of the above

Answer 14

C. Both A and B.

Increases conditioned air flow to the cockpit foot warmers.
Increases conditioned air flow to the cockpit side outlets.

Question 15

Pushing the BAGG/SMOKE pushbutton ________

A. Opens the baggage door
B. Isolates the baggage compartment from the cabin by closing the smoke isolation valve thereby cutting off flow of pressurized air from the cabin to the baggage compartment
C. Alerts passengers that smoking is now permitted
D. Calls the fi rst offi cer to load the baggage

Answer 15

Isolates the baggage compartment from the cabin by closing the smoke isolation valve thereby cutting off flow of pressurized air from the cabin to the baggage compartment.

Question 16

Under what circumstances will the crew receive a CABIN ALT HIGH message?

A. Cabin altitude above 10,000 feet
B. Cabin pressure above 8.8 PSI
C. Cabin altitude above 14,000 feet
D. Cabin pressure above 8.65 PSI

Answer 16

A. Cabin altitude above 10,000 feet.

Question 17

When does the Turbine Bypass Valve (TBV) close?

Answer 17

Climbing through FL 400.

Question 18

What is the approximate temperature of the air coming out of the distribution plenum?

Answer 18

1.7°C (35°F).

Question 19

What is the purpose of the Turbine Inlet Control Valve (TICV)?

Answer 19

Maintains turbine inlet temperature at 75 degrees F to prevent icing.

Question 20

At what temperature do the nose compartment ventilation fans come on?

Answer 20

45°C (113°F).

Question 21

Where are the cockpit and cabin temperatures sensed?

Answer 21

Cockpit – behind left seat; cabin – forward of No. 2 seat on the left side.

Question 22

What is the maximum duct temperature that should ever be experienced and what happens at that temperature?

Answer 22

71°C (160°F) – Trim valves close.

Question 23

Does Emergency Air have the temperature control?

Answer 23

No.

Question 24

Where are the cabin temperatures and cockpit temperatures displayed?

Answer 24

EICAS Systems page (Page 2).

Question 25

What is the function of the Trim Air Valves? Does the crew ever control them?

Answer 25

Add heat to conditioned air. The crew controls them indirectly when temperature control switches in the center pedestal are set to auto, and the crew controls the trim air valves directly when those switches are set to manual (MAN).

Question 26

What prevents air from back-pressuring into the ECU from the cockpit or cabin?

Answer 26

Check valves at the pressure bulkhead.

Question 27

In the event of Pack failure, how does the crew supply air to the cabin and where does the air come from?

Answer 27

The pilot should move the ECS selector knob to EMERG. This will open the Emergency Air Shutoff Valve, causing low-pressure bleed air from the right engine to flow through the Emergency Air Heat Exchanger into
the cabin.

Question 28

If the outflow valve fails, what position does it go to and can the crew still control it?

Answer 28

It fails to the closed position & can still be operated by either DC motor.

Question 29

At what PSI does the safety relief valve open?

Answer 29

8.95 psid.

Question 30

At what altitude does the turbine bypass valve open and at what altitude does it close?

Answer 30

It opens as the airplane climbs through 40,000 feet , and it closes as the airplane descends through 39,000 feet.

Question 31

The automatically controlled supply air temperatures are limited to what high and low values? At what high temperature will the limiters close the trim air valves?

Answer 31

1.7°C (35°F) & 93.3°C (200°F).

Question 32

While in-flight under 14,000 feet, under what circumstances will the crew receive a CABIN DOOR message?

Answer 32

A CABIN DOOR message alerts the crew that the main cabin door is not locked or a micro-switch has failed. If in fl ight below 14,000 feet, the Cabin Pressure Control System (CPCS) will depressurize the cabin at a rate of 1000 feet per minute.

Question 33

Describe the conditions that cause the HPSOVs to open and close both on the ground and in fl ight.

Answer 33

Ground – Whenever N1 is below 50%.

Flight – Whenever LP Pylon switch senses less than 12.5 psi , climbing through FL 400, or during idle descents.

Question 34

Is it possible to go to ECS High Flow in the air?

Answer 34

Yes, Use of HI FLOW is authorized in flight when the main engines (not the APU) are selected as the bleed air source.

Question 35

In addition to the environmental control and pressurization, what else is bleed air used for on the aircraft?

Answer 35

Bleed air is used to pressurize the hydraulic reservoirs and water tank (APU bleed), and to power the rudder bias and de-ice boots (main engines low-pressure bleed).

Question 36

What happens when RAM AIR is selected?

Answer 36

The Outflow valve opens, and the Ram Air Check Valve opens, allowing outside air from scoop at base of vertical stabilizer to enter the plenum directly.

Question 37

The RAM AIR SCOOP at the base of the vertical stabilizer splits into three ducts (branches). What are their purposes?

Answer 37

Primary & secondary heat exchangers, precooler, & ram air duct.

Question 38

Does APU air go through the Ozone converter? Precooler?

Answer 38

No & No.