B744 ECS PANEL

Question 1

What happens to the Outflow Valves upon Touchdown?

Answer 1

They go full open

Question 2

If one Outflow Valve is in MAN, will the other Outflow Valve operate in AUTO?

Answer 2

YES

Question 3

Where/When can I observe Cabin Alt & Rate, Landing Alt?

Answer 3

Primary EICAS Display when:
- Landing Alt in Manual
- Cabin Alt in Caution or Warning
- Cabin Differential Press in Caution or Warning 
ECS or ENG selected on Secondary EICAS

Question 4

Is there auto switching of Cabin Altitude controllers if one should fail?

Answer 4

YES

Question 5

When does the Cabin ALT warning siren sound?

Answer 5

Cabin Altitude excessive (>10,000’)

Question 6

What is the max allowable cabin differential pressure for T/O & Landing?

Answer 6

.11 psi

Question 7

What is the max differential pressure (relief valves)?

Answer 7

9.4 psi

Question 8

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

Answer 8

2

E and E compartment, left front compartment

Question 9

Where are the negative pressure relief valves located?

Answer 9

Cargo doors (side, fwd & aft)

Question 10

What is the Temp° range for the Flt Deck?

Answer 10

18°-29°C (65°-85°F)

Question 11

What does the Manual position of the Temp° controllers do?

Answer 11

Sets the Trim air valves manually

Question 12

What will cause a Zone Sys Fault light to illuminate?

Answer 12

Ø Temp° Zone duct overheat 
Ø Zone Temp° Controller fault 
Ø Master Trim air valve closed 
Ø Trim air switch OFF
Ø Master Trim air valve closed and pack air still flowing

Question 13

What will cause a Pack Sys Fault light to illuminate?

Answer 13

• Pack Overheat or other Sys fault

- May illuminate briefly while switching between controller (Auto or Manual)

Question 14

What happens when I press the Trim Air switch to OFF?

Answer 14

Ø Master Trim Air valve closes
Ø Pack output temp° in backup mode (18°-29°C) as selected by Flt Deck selector in AUTO
Ø No control of Flt Deck, Upper Deck or main Deck
Ø Pack controller A only

Question 15

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

Answer 15

Into the Lower Fwd Cargo compartment when temp° < 7°C

Overboard when temp° > 7°C

Question 16

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

Answer 16

Configures for Flt closing the outboard exhaust valve, venting air into the Lower Fwd Cargo compartment

Question 17

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

Answer 17

Manually reconfigures the aircraft for flight doing the same as above

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

Question 19

What items are provided air from the center Duct?

Answer 19

Ø Master Trim Air 
Ø Aft Cargo heat
Ø Cargo Smoke detection
Ø Potable Water pressurization
Ø Lower Lobe Cargo air conditioning Trim Air