2025 05 ACTS: Oxygen / Pneumatics

Question 1

Oxygen:
What does the PASSENGER SYS ON light mean?
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Answer 1

The signal to release the oxygen mask doors has been sent

Question 2

Oxygen:
When do the masks automatically deploy?
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Answer 2

º When cabin altitude exceeds 14,000 feet

Question 3

Oxygen:
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How long does the PAX oxygen last?

Answer 3

Approximately 13, 15 or 22 minutes (depending on generator installed)

Question 4

Oxygen:
Where is oxygen stored for the crew?
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Answer 4

In a single high-pressure cylinder

Question 5

Oxygen:
What happens during the preflight when you push to extinguish the CREW SUPPLY OFF light?
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Answer 5

It electrically opens a valve in the avionics bay to supply low-pressure crew oxygen

Question 6

Oxygen:
What would you notice on the DOOR ECAM page if you set the CREW SUPPLY to ON?
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Answer 6

The OXY would change from amber to green

Question 7

Oxygen:
Will the crew oxygen mask microphone automatically be deactivated when the mask is stowed?
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Answer 7

No, you must press the RESET slide switch

Question 8

Pneumatics: Air Conditioning Panel:
The pneumatic system is monitored and controlled by?
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Answer 8

2 Bleed Monitoring Computers (BMC)

Question 9

Air Conditioning Panel:
If one BMC fails, can the other take over?
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Answer 9

º Yes, they are interconnected.
If BMC 1 fails:
º APU and ENG 1 leak detection are not monitored
º ECAM APU BLEED LEAK warning is lost

Question 10

Air Conditioning Panel:
What causes the amber FAULT light on the ENG 1 BLEED and/or ENG 2 BLEED pushbutton (OOLD)?
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Answer 10

º Overpressure - Downstream of the bleed valve
º Overheat
º Leak - Low pressure
º Discontinuity - APU bleed valve open and engine bleed valve not closed or
º Engine Start with bleed valve not closed

Question 11

Air Conditioning Panel:
What are the two functions of the engine bleed valves?
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Answer 11

º Pressure regulation
º Shut off valves

Question 12

Air Conditioning Panel:
What logic controls the X-Bleed valve when the X-BLEED switch is in AUTO?
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Answer 12

º When APU bleed valve is OPEN, the X-Bleed valve is open
º When APU bleed valve is CLOSED, the X-Bleed valve is closed
º X-Bleed also CLOSES for wing, pylon, or APU duct leak (except during engine start)

Question 13

Air Conditioning Panel:
After engine start with the APU BLEED pushbutton ON, what source is supplying bleed air to the packs?
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Answer 13

APU Bleed

Question 14

Oxygen Panel:
What are the steps for testing the crew oxygen masks during Cockpit Preparation? FCOM-DSC-35-20-30

Answer 14

• CREW SUPPLY pb: ON
• Loudspeakers: ON
• INT reception knob: press out, adjust volume
• INT/RAD sw - INT
• Press and hold RESET/TEST button in direction of arrow. check that blinker turns yellow briefly then goes black
• Hold the REST/TEST button down, and press Emergency Pressure selector. Check that the blinker turns yellow and remains yellow as long as pressed. Listen for oxygen flow through the loudspeakers.
• Check that the RESET/TEST button returns to the up position and the N/100% selector is in the 100% position.
• Press the Emergency Pressure selector again, and check that the blinker does not turn yellow. This ensures the mask is not supplied.
• Check that the Emergency Prssure selector is NOT turned right in the direction of the arrow (permanent overpressure). This ensures that the oxygen permanent overpresskure is not supplied.