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E175 Systems > Oxygen > Flashcards

Oxygen Flashcards

1
Q

What does the oxygen system consist of?

A

Flight crew oxygen, passenger oxygen, 4 PBEs Personal Breathing Equipment, and 2 Portable Oxygen Cylinders

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2
Q

How much oxygen can the flight crew bottle hold?

A

77 cubic inches

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3
Q

Is the flight crew oxygen system connected to the passenger oxygen system?

A

No

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4
Q

What is the normal PSI of the flight crew oxygen system?

A

1850psi at 70deg F

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5
Q

What is the minimum flight crew oxygen for dispatch?

A

Green for 3 - 1150psi, Blue for 2 842psi, Amber No Dispatch

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6
Q

What is the purpose of the purge valve?

A

To clear goggles of smoke when flight crew oxygen is selected to EMER

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7
Q

What are the 3 flight crew oxygen modes?

A

Emergency - 100% and positive pressure; 100%; Normal - diluted up to a specific altitude, then becomes 100%

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8
Q

What happens when the flight crew oxygen mask is removed from the storage box?

A

Activates mask microphone, mic will stay on until box door is shut and reset button is pressed, transfers audio to speaker

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9
Q

How will you know if the flight crew oxygen system is over-pressurized?

A

the green discharge disc on the forward right side of the aircraft will disappear

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10
Q

How can the oxygen pressure be checked?

A

Via the MCDU STATUS page (automatically compensated for temperature) or the refill panel on the forward right side of the aircraft

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11
Q

What does the passenger oxygen consist of?

A

Chemical generation - activated when lanyard on mask is pulled (cannot be stopped once activated)

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12
Q

How many minutes of passenger oxygen is available?

A

12 minutes

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13
Q

When will the passenger oxygen system automatically deploy?

A

when cabin reaches 14,000’

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14
Q

If the passenger oxygen masks do not deploy automatically, what EICAS message will appear?

A

PAX OXY NOT DEPLOYED

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15
Q

What signs illuminate when the passenger oxygen masks are deployed?

A

Seatbelt sign and no smoking sign illuminates automatically when passenger masks are deployed

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16
Q

How many PBEs are there in the aircraft, where are they?

A

4 - 1 in the cockpit, 3 in the cabin (1fwd galley, 1 aft galley)

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17
Q

What kind of PBE do we have?

A

Oxygen generator type

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18
Q

How long will the PBE last?

A

15min at FL410

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19
Q

How will you know the PBE has expired?

A

The indicator will turn from blue to pink

20
Q

How many portable oxygen bottles do we have, where are they located?

A

2, 1 in front and 1 in rear of cabin

21
Q

How long do the portable oxygen containers last?

A

30min

22
Q

Where can oxygen pressure be read?

A

MFD STATUS Page (corrected for temperature) or the Oxygen cylinder panel (not corrected for temperature)

23
Q

Do the cockpit and the passengers share the same emergency oxygen?

A

No

24
Q

Once the chemical oxygen generators are started, can they be shut off?

A

No

25
Q

What is the minimum oxygen for a cockpit crew?

A

Green for 3, Blue for 2

26
Q

What activates when the flight deck oxygen masks are removed from their storage unit?

A

flow of oxygen, mask microphone, flight deck speakers

27
Q

What happens if the test/reset button is pressed while the flight deck oxygen masks are not stowed?

A

stops the flow of oxygen, deactivates microphone, deactivates speakers

28
Q

What type of oxygen will the quick-donning cockpit crew masks provide?

A

Emergency, 100% and Normal

29
Q

During preflight, how would you know if the cockpit crew oxygen has been over pressurized?

A

The green blow-out disc would be missing on the forward right side of the fuselage

30
Q

What is the oxygen duration for passengers, FA cylinders, and PBE?

A

12min for PAX, 30min for FA, 15min for PBE

31
Q

When will the passenger oxygen automatically deploy?

A

14,000’MSL

32
Q

Can the oxygen door dispensing units be opened manually if it fails to automatically deploy?

A

Yes, via a MRT Manual Release Tool located at each FA station

33
Q

What does the PBE provide?

A

Pressurized oxygen and protection from smoke, fumes, and fire up to FL410 for 15min; blue is good, pink is bad, vacuum loss is bad and can be blue

34
Q

How many portable Oxygen cylinders are installed in the cabin?

A

2 for LR, 3 for LL, one fwd and one aft with 2 masks per cylinder

35
Q

What oxygen mask setting will allow smoke to be inhaled?

A

Normal

If the regulator were set to NORMAL, these masks will only reduce the concentration of smoke or other contaminants inhaled.

36
Q

What does the 100% mask setting do?

A

Provides oxygen under positive pressure, so no smoke can enter

37
Q

What if there is already smoke in the mask?

A

If purging of the full face oxygen mask is necessary, the emergency selector should be momentarily selected. This will supply the mask with oxygen under positive pressure to expel any contaminants. The emergency selector should be selected only until contaminants are expelled; otherwise oxygen will be depleted very rapidly.

38
Q

How is crew communication established via the oxygen mask?

A

The mask is also connected to the communications system. When the oxygen mask stowage box door is opened the mask’s microphone is automatically activated and the headset boom microphone is deactivated. The speakers are also automatically activated and the communication reception is possible through the speakers or the headsets. When the oxygen mask stowage box is closed and the TEST/RESET switch is pressed the headset boom microphone is restored and the mask’s microphone is turned off.

39
Q

What if crew communication isn’t automatically working for the oxygen masks?

A

Press the mask mic button on the audio panel

40
Q

Should passenger oxygen masks be deployed when there is smoke?

A

No. Passenger oxygen masks should not be deployed when smoke is detected in a pressurized cabin. At cabin altitudes below 14,000 feet, masks provide a limited amount of oxygen which is mixed with ambient air and smoke, if present. If loss of cabin pressure has caused masks to deploy, they should be used during descent and removed as soon as possible after cabin pressure is below 14,000 feet.

41
Q

What type of system provides oxygen to the flight crew?

A

Flight crew oxygen is provided via a conventional, high-pressure, gaseous-type system.

42
Q

How is the flight crew oxygen system stored? At what pressure and temperature?

A

The oxygen is stored in a 77 ft3 cylinder, pressurized up to 1850 psi at 21°/70°F.

43
Q

Where is the flight crew oxygen located?

A

The cylinder is installed in the forward cargo compartment.

44
Q

What are the 3 oxygen mask modes and how are they different?

A

Oxygen masks are operated at three selectable modes. The NORMAL mode is to be used as a supplemental, when a regular amount of oxygen, diluted with cabin air is capable to maintain a safe physiologic level until a preset altitude, where the user inhales 100% oxygen. The 100% mode is mandatory during an emergency descent, as it is not diluted with cabin air, regardless cabin altitude. The EMER mode is useful to remove smoke and fumes, as it is non-diluted oxygen regardless of cabin altitude with a slightly positive pressure.

45
Q

When descending for a cabin altitude issue, what should be done upon reaching 10,000’?

A

Once mask usage is not necessary, pilots must close the oxygen mask stowage box doors and press reset button, enabling hand/headset microphone booms.

Once cabin altitude reaches 10,000 ft or lower and when it is safe for the passengers to remove their oxygen masks, the ATTND CALL button shall be pressed twice to generate two high low chimes. Flight Attendants will instruct the passengers it is safe to remove their oxygen masks.

E175 Systems (18 decks)

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