Environmental Control Sysrem

Question 1

Where is pack air distributed?

Answer 1

1. Pack 1 goes to cockpit and last 4 rows

2. Pack 2 goes to the cabin

Question 2

How do you energize the aft cargo heater

Answer 2

Automatically by switching the Aft Cargo switch to COND AIR

Question 3

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

Answer 3

1. ACSC tells Temp Cntrl Valve to actuate

2. Ram air valve controls how much cooling is accomplished in the pre cooler

Question 4

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

Answer 4

1. Crew oxygen = 1 oxygen cylinder

2. Cabin = chemical oxygen concentrator

Question 5

How are the packs cooled?

PSM 08-20-1

Answer 5

Ram air is used for pack cooling and ventilation

Question 6

How is the temperature controlled in the aft cargo compartment

Answer 6

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

Question 7

How are the outflow valves opened and closed?

Answer 7

Electrical motor

Question 8

How much oxygen is supplied above 30,000 ft?

PSM 09-20-5

Answer 8

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

Question 9

Where are the portable oxygen bottles located?

PSM 09-20-15

Answer 9

Near each flight attendant station

Question 10

Where is the portable water fire extinguisher located

PSM 09-40-1

Answer 10

On the aft bulkhead

Question 11

When must the recirc. Fan switch be off?

Answer 11

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

Question 12

How is the aft cargo heated?

Answer 12

Electrical heater

Question 13

When should COND AIR be selected?

Answer 13

After takeoff when ambient temps are below 15* C

Question 14

When does the CAbin pressure controller(CPC) activate?

Answer 14

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

Question 15

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

Answer 15

1, 3

Question 16

What does the pressurization ground valve do?

Answer 16

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

Question 17

Messages associated with the pressurization system are?

Answer 17

• CABIN ALT caution at 8500

- CABIN AZlT warning at 10000

Question 18

When do the oxygen masks drop?

Answer 18

At 14,000 +/-300

Question 19

How many pressurization safety valves are there?

Answer 19

2

Question 20

What are the three phases of the inhibit functions?

Answer 20

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

Question 21

Selecting the MAN ALT up does what?

Answer 21

Opens the outflow valves

Question 22

DISPLAY COOL caution means what?

Answer 22

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