AIRCON/PRESS/VENT

Question 1

Max positive

Max negative

Safety Valve

Answer 1

Max positive - 9.0PSI

Max negative - -1.0PSI

Safety Valve - 8.6PSI

Question 2

Cabin Alt advisory?
Cabin Alt warning?
Mask drop alt?

Answer 2

Cabin Alt advisory? - 8800ft
Cabin Alt warning? - 9550ft
Mask drop alt? - 14000ft

Question 3

How do you change from CPC 1 to 2 or vice versa?

Answer 3

MAN PB on for at least 10s

Question 4

How many motors control the outflow valve?

Answer 4

3.
2 auto
1 manual

Question 5

Ditching PB selected on closes which valves?

Answer 5

Outflow, ram air, pack control valves, avionic vent inlet and outlet. Anything below the flotation line.

Question 6

On take off to was diff pressure is the cabin pressurised to?

Answer 6

0.1PSI

Question 7

How many seconds after landing until the CPC changes over?

Answer 7

70secs

Question 8

How many seconds after landing before outflow fully opens?

Answer 8

55secs

Question 9

When does the pack ram air open after landing?

Answer 9

20secs after 70kts

Question 10

How many pressure safety valves are there and where are they located?

Answer 10

2 on the rear bulkhead above the flotation line

Question 11

RAM AIR guarded PB on does what?

Answer 11

With CPC in auto and provided delta p below 1PSI the outflow opens 50% and the ram air flows into the aircraft.

Question 12

With loss of the FMGS how do you set the LDG ELEV?

Answer 12

Crew selects field elevation using OVHD panel selector and ECAM SD page. The pressurisation system then uses the manually selected landing field elevation for internal schedules.

Question 13

When will pack flow automatically default to HIGH?

Answer 13

APU feeding the system or single pack operation.

Question 14

What does the PACK PB control?

Answer 14

Pack flow control valve

Question 15

What would be normal parameters for the precooler air?

Answer 15

36PSI +/-4
200 DEGREES

Question 16

How is the air in the precooler cooled?

Answer 16

It uses fan air from the engine

Question 17

What is the sequence the air takes through the PACK?

Answer 17

PRIMARY HEAT EXCHANGE
COMPRESOR(TEMP + PRESURRE INCREASE)
MAIN HEAT EXCHANGE
TURBINE
*A WATER SEPARATOR SYSTEM DRIES THE AIR BEFORE IT ENTERS THE TURBINE
MIXING UNIT

Question 18

How much control does the CC have on the temp?

Answer 18

+/-2.5 degrees

Question 19

Hot air PB failed closed?

Answer 19

Trim air valves are driven to fully closed position.
Pack 1 Controls cockpit temp to the selected value
Pack 2 controls the cabin temp to the mean valve of selected temps