Pneumatics

Question 1

When is High Pressure P3.0 used?

Answer 1

At low pressure settings to supplement the P2.7 supply.

Question 2

What is P2.2 Air used for?

Answer 2

To cool higher-pressure air from the other two sources.

Question 3

How is the Bleed Air Supply System affected by a loss of the Main DC Bus Power?

Answer 3

Both HPSOUs and Nacelle FCSOUs will close.

Question 4

Where does the APU Bleed Air enter the Bleed Duct.

Answer 4

At the pack control shut off valve PFSOV

Question 5

Can APU Bleed Air be used if the engines are running?

Answer 5

No

Question 6

What conditions would bring on a single BLEED HOT Caution?

Answer 6

Over-temperature, over-pressure or a leak in one of the Bleed air ducts, upstream of the Wing Duct Check valve.

Question 7

What is the function of the Bypass Valves in the Air Conditioning System?

Answer 7

Regulate the temperature of the air sent into the aircraft.

Question 8

How is Conditioned Air divided between the Flight Deck and the Cabin?

Answer 8

75% Cabin and 25% Flight Deck

Question 9

What does the Recirculation Fan do?

Answer 9

Draws air from the Cabin and Flight Deck to mis it with outside air.

Question 10

How does the TEMP CONTROL system function with the Pack Switched in AUTO?

Answer 10

ECU uses the digital channel to control the temperature between 15 and 22 deg C

Question 11

How does the TEMP CONTROL system function with the Pack Switched in MAN?

Answer 11

Duct Supply Temperatures are directly controlled by the bypass valves between 2.7 and 71 deg C

Question 12

What determines the relative Cabin Flow Rate to the upper and lower Distribution Ducts?

Answer 12

The Distribution Valve

Question 13

How is Emergency Ram Air Ventilation accomplished?

Answer 13

Closing the rear outflow valve and opening the forward outflow valve. Must have Packs off and 150 KIAS

Question 14

How are the Avionics cooled?

Answer 14

An extraction type cooling system. 3 fans DC powered automatically.

Question 15

How is aircraft pressurisation normally controlled?

Answer 15

Automatically by the cabin pressure controller modulating valve.

Question 16

How is the fuselage protected from over-pressure or under-pressure?

Answer 16

Two safety valves one on the rear pressure dome and one on the forward bulkhead

Question 17

What prevents the Cabin from pressurising on the ground?

Answer 17

Aft safety valve and rear outflow valve move to fully open if the PL

Question 18

When and how does the Forward Outflow Valve function?

Answer 18

To purge smoke from the cockpit, using FWD outflow VALVE selector.

Question 19

What happens when the DUMP/MAN/AUTO Switch is set to MAN?

Answer 19

Pressurisation diff controlled manually from Pressurisation control panel.

Question 20

What happens when the DUMP/MAN/AUTO Switch is set to DUMP?

Answer 20

Aft outflow valve is opened fully

Question 21

How should the LDG ALT Control be set, before departure?

Answer 21

Landing altitude at destination.

Question 22

What value should be indicated on the DIFF Indicator when climbing through FL100?

Answer 22

4 psi

Question 23

What is the Maximum permitted DIFF during Taxy, Take-off and Landing?

Answer 23

0.5 psi

Question 24

What is the Maximum permitted DIFF?

Answer 24

5.95 psi

Question 25

What is the Maximum permitted Cabin Altitude when pressurised?

Answer 25

8,000ft

Question 26

When should the CABIN PRESS Warning Illuminate?

Answer 26

At Cabin Altitude 9,800ft

Question 27

How is Cabin Temperature controlled if APU Bleed Air is being used?

Answer 27

By COLD/WARM selectors on the AC power.

Question 28

How do the Air Bleed Selector settings of NORM and MAX effect the flow of Bleed air when operating on one Engine?

Answer 28

No effect, Bleed air flow controlled automatically be the ECU.

Question 29

How is Engine Oil cooled on the ground?

Answer 29

Air is drawn through the Heat exchanger by Ejector valves.