ECS System

Question 1

What happens to the outflow valves upon touchdown?

Answer 1

they go full open

Question 2

If one outflow valve is in manual, will the other outflow valve operate in auto?

Answer 2

yes

Question 3

Where/When can I observe cabin altitude and rate, landing altitude, and differential pressure?

Answer 3

Primary EICAS when:

• landing altitude in manual
• cabin altitude in caution or warning
• cabin differential pressure in caution or warning
• ECS or ENG selected on lower EICAS

Question 4

Is there auto switching of cabin altitude controllers if one should fail?

Answer 4

yes

Question 5

When does the cabin altitude waring siren sound?

Answer 5

excessive cabin altitude (greater than 10,000 ft)

Question 6

What is the max allowable cabin differential pressure for takeoff and landing?

Answer 6

0.11 PSI

Question 7

What is the max differential pressure?

Answer 7

9.4 PSI

Question 8

How many positive pressure relief valves are there nd where are they located?

Answer 8

2 in E&E compartment (left front compartment)

Question 9

Where are the negative pressure relief valves located?

Answer 9

side cargo door and forward and aft cargo doors

Question 10

What is the temp range for the flight deck?

Answer 10

18C-29C

Question 11

What does the manual position of the temperature controllers do?

Answer 11

sets the trim air valves manually

Question 12

What will cause a zone system fault light to illuminate?

Answer 12

• temp zone duct overheat
• zone temp controller fault
• master trim air valve closed
• trim air switch off
• master trim air valve closed and pack air still flowing

Question 13

What will cause a pack system fault light to illuminate?

Answer 13

• pack ovate or other system fault

- may illuminate briefly while switching between controller (auto or manual)

Question 14

What happens when you press the trim air switch to off?

Answer 14

• master trim air valve closed
• pack output temp in backup as selected by Flt. Deck selector in auto
• no control of flight deck, upper deck, or main deck
• pack controller A only

Question 15

On the ground, engines not running, where is Equip. Cooling exhaust air routed?

Answer 15

• into the lower forward cargo compartment when temp
  < 7C
• ducted overboard when temp > 7C

Question 16

What happens to the Equip. Cooling system on the ground when engines are running?

Answer 16

configures for flight, closing the outboard exhaust valve, venting the air into the lower FWD cargo compartment

Question 17

What does the STBY position of the Equip. Cooling system do?

Answer 17

manually configures the aircraft for flight

Question 18

What does the OVRD position of the Equip. Cooling system do?

Answer 18

the fans are deactivated and the air is vented overboard using cabin differential pressure