AIR MANAGEMENT SYSTEM/PRESSURIZATION

Question 1

The Air Management System Consists of:

Answer 1

• Pneumatic System
• Environmental Control System (ECS)
• Pressurization System

Question 2

At 45,000 feet what is the Cabin Altitude?

Answer 2

6640 feet Cabin Altitude

Question 3

At what cabin altitude will you get a CAB ALTITUDE HIGH CAS message?

Answer 3

10,000 feet if the airport is below 8300 ft

11,500 feet if the airport is above 8300 ft and below 9600 feet

14,200 feet if the airport is above 9600 feet (HI FIELD CAS message displayed)

Question 4

It is normal to see a BLEED 2 OFF or BLEED 2 OFF and BLEED 1 OFF CAS messages (white status), why?

Answer 4

The system opens or closes bleed valves depending on the outside air temperature, to limit the amount of hot bleed air entering the cabin. Below 10°C both bleed valves remain open. Between 10°C and 30°C one bleed valve closes. Above 30°C both bleed valves will close.

Question 5

Does the DUMP button have an altitude limiter?

Answer 5

YES

Question 6

What is the single Bleed service ceiling?

Answer 6

36,000 feet

You will see this number on various QRH/QRC procedures.

Question 7

Why is the outflow valve located on the aft pressure bulkhead?

Answer 7

Smoke gets diverted to the back and out of the plane

Equipment rack cooling.

Odors

Question 8

What happens when you place the AIR CONDITIONING TEMPERATURE MODE SWITCH to OFF

Answer 8

TURNS OFF VCS (compressor/condenser, fan, and evaporators)

THE TEMPERATURE AUTOMATIC MODE IS KEPT ACTIVE.

Question 9

PRESSURIZATION

What is the ECMU?

Answer 9

Electronic Control and Monitoring Unit

The basic function of the controller is to control Cabin pressure by generating a command for the outflow valve to modulate airflow through the valve from the pressurized airplane volume to the surrounding environment. It has 2 channels, one controlling cabin pressure automatically and the other allowing for manual control through the PRESN panel.