Environmental Control Sysrem Flashcards Preview

CRJ900 Limitations, Systems > Environmental Control Sysrem > Flashcards

Flashcards in Environmental Control Sysrem Deck (22):
1

Where is pack air distributed?

1. Pack 1 goes to cockpit and last 4 rows
2. Pack 2 goes to the cabin

2

How do you energize the aft cargo heater

Automatically by switching the Aft Cargo switch to COND AIR

3

How do the packs change the temperature so as to effect the output temperature?

1. ACSC tells Temp Cntrl Valve to actuate
2. Ram air valve controls how much cooling is accomplished in the pre cooler

4

What's the difference between passenger oxygen and crew oxygen?

1. Crew oxygen = 1 oxygen cylinder
2. Cabin = chemical oxygen concentrator

5

How are the packs cooled?
PSM 08-20-1

Ram air is used for pack cooling and ventilation

6

How is the temperature controlled in the aft cargo compartment

In the AIR position - recirculated air and in COND AIR the heater is enabled

7

How are the outflow valves opened and closed?

Electrical motor

8

How much oxygen is supplied above 30,000 ft?
PSM 09-20-5

The mask supplies pure oxygen regardless of the N/100% switch position

9

Where are the portable oxygen bottles located?
PSM 09-20-15

Near each flight attendant station

10

Where is the portable water fire extinguisher located
PSM 09-40-1

On the aft bulkhead

11

When must the recirc. Fan switch be off?

Temp is warmer than 30* C so that the fans don't burn up

12

How is the aft cargo heated?

Electrical heater

13

When should COND AIR be selected?

After takeoff when ambient temps are below 15* C

14

When does the CAbin pressure controller(CPC) activate?

3 minutes after WOW is sensed or if PRESS CONT is pressed

15

How many outflow valves and how many electric motors on them?

1, 3

16

What does the pressurization ground valve do?

Dumps pressurized air on the ground. It also dumps CRT and avionics ventilation overboard

17

Messages associated with the pressurization system are?

- CABIN ALT caution at 8500
- CABIN AZlT warning at 10000

18

When do the oxygen masks drop?

At 14,000 +/-300

19

How many pressurization safety valves are there?

2

20

What are the three phases of the inhibit functions?

1. Takeoff initial phase
2. Takeoff final phase
3. Landing phase

21

Selecting the MAN ALT up does what?

Opens the outflow valves

22

DISPLAY COOL caution means what?

Display fan 1 or 2 standby fan has failed or there is low pressure in the cooling duct