Environmemtal - Pressurization

Question 1

What temp do the pre coolers, cool the bleed air to?

Answer 1

500 degrees F

Question 2

What is bleed air used for?

Answer 2

Wing anti ice
Engine anti ice 
Pressurization of the cabin 
Windshield anti ice 
Service air (23 psi)

Question 3

When does the door seal annunciator light illuminate?

Answer 3

When pressure drops below 8.45 psi

Question 4

When are LH or RH source selectors of bleed air used?

Answer 4

In the case of over pressurization

Question 5

What does the fresh air setting do?

Answer 5

Closes all the valve and only allowing Ram air in.

Only to be used on the ground, as it will not pressurize the aircraft.

Question 6

EMER PRESS ON annunciation

Answer 6

Emergency pressurization is connected to windshield anti ice and uses windshield anti ice air.

Opens both windshield anti ice and Emergency pressurization control valves supply 6ppm, 120 degree air into the cabin.

Question 7

When does the BLD AIR O’HEAT annunciator illuminate?

Answer 7

Temps greater than 540 degrees

Question 8

How can the temperature be controlled?

Answer 8

Automatically or manually

Question 9

How does the temp control system function?

Answer 9

By changing the position of the cabin bleed air heat exchanger, ram air modulating valve.

Question 10

What does the ram air modulating valve do?

Answer 10

Controls the amount of ram air cooling that passes through the cabin heat exchanger.

Question 11

When will the air conditioning compressor operate?

Answer 11

When the ram air modulating valve is full open and the compressor switch is in auto

Question 12

When does the air conditioning compressor kick off?

Answer 12

When the ram air modulating valve is 70% or more closed.

Question 13

When does the AIR DUCT O’HEAT annunciator illuminate

Answer 13

When cabin supply air temp exceeds 300 degrees

MASTER CAUTION is also associated.

Select a cooler temp.

Question 14

When will the air compressor automatically kick off?

Answer 14

Generator failure

Question 15

How many evaporators on the aircraft

Answer 15

2

One in the FWD cabin under side facing seat

One in the AFT bulkhead

Question 16

How is the radio stack cooled?

Answer 16

Two cooling fans.

Fan 1 is located within the radio stack.

Fan 2 is located in the cockpit below the right floor panel

Both come on automatically

Question 17

Maximum cabin differential

Answer 17

8.6 psi d

Question 18

Emergency pressurized air comes from where?

Answer 18

EMER switch, which pulls air from windshield bleed air

Question 19

Where does incoming air for pressurization come from?

Answer 19

Source selector

BOTH, LH, or RH

Question 20

How many valves for the outgoing air?

Answer 20

2 outflow valves on aft pressure bulkhead

Question 21

What is the digital pressure controller set to maintain at maximum?

Answer 21

8.3 psi d

Question 22

Max rates of climb/decent for the cabin?

Answer 22

Climb - 500 fpm

Decent - 600 fpm

Question 23

When do both outflow valves open?

Answer 23

When on the ground because of the squat switch

Question 24

What do the maximum differential pressure relief valves do?

Answer 24

They compare cabin pressure, to outside static air pressure.

Question 25

Can the Emergency dump valve be operated with no DC power?

Answer 25

No

Question 26

Cabin differential pressure shows what?

Answer 26

Cabin altitude and differential pressure

Question 27

When does the system begin auto schedule mode?

Answer 27

When either squat switch indicates in flight, or the aircraft altitude increases 1,500 ft

Question 28

Position of the outflow valves in ground taxi mode

Answer 28

Both outflow valves are fully open

Question 29

Pre pressurization mode

Answer 29

On the ground with both throttles about 85% N2, both outflow valves slowly close

Question 30

What happens if the yellow caution light appears on top left corner of controller display face?

Answer 30

Controller has switched from AUTO to ISOBARIC mode