CRJ900 Systems Environmental Control and Pneumatics

Question 1

The right hand pack normally supplies the

Answer 1

Passenger cabin

Question 2

RAM AIR ventilation is used only when

Answer 2

The aircraft is unpressurized

Question 3

Cabin air outflow is controlled automatically by

Answer 3

The active CPC which maintains aircraft pressureization

Question 4

The pressurization system automatically pre-pressurizes the aircraft to

Answer 4

-150 ft

Question 5

Maximum negative differentail pressure is

Answer 5

-0.5 psi

Question 6

If the cabin altitude reaches 14,000 ft the

Answer 6

CPAM will trigger the oxygen system auto deploy to the passengers

Question 7

On the ground, with Display Control Panel in “Normal” what fan cools the cockpit displays?

Answer 7

GND Fan

Question 8

When the Press Cont switch light is pressed in

Answer 8

It selects manual mode

Question 9

The manual cabin altitude regulator, when selected UP

Answer 9

Causes the outflow valve to open and increases the cabin altitude

Question 10

When in manual (MAN) the pressurization readouts are displayed on

Answer 10

EICAS primary page

Question 11

The two safety valves located on the aft pressure bulkhead provide

Answer 11

over pressure and negative pressure relief

Question 12

During ground operations (after landing) the ground valve

Answer 12

Will open to assist in the cooling of the avionic and CRT screens

Question 13

What is the normal source for engine supply bleed air to the manifold?

Answer 13

6th and 10th stage