Module 11.15 Oxygen

Question 1

What are the two types of oxygen systems on an aircraft?

Answer 1

• Fixed
• Portable

Question 2

What are the two fixed oxygen systems?

Answer 2

• Flight deck
• Cabin

Question 3

Where are the oxygen bottles located for the flight crew system?

Answer 3

In the avionics

Question 4

When do the cabin masks deploy?

Answer 4

When the cabin altitude goes above 14,000ft

Question 5

Why is aviators oxygen used?

Answer 5

Almost completely dry

Question 6

What are the oxygen bottles made of?

Answer 6

Used to be made of steel but now they are made of aluminium wrapped in kevlar

Question 7

What pressure are the oxygen bottles?

Answer 7

1850 psi

Question 8

Where is the shut off valve located?

Answer 8

Upstream of the regulators

Question 9

What type of regulator is located near the bottle?

Answer 9

Pressure regulator

Question 10

What type of regulator is located near the cockpit masks?

Answer 10

Flow regulator, called a demand regulator

Question 11

What are the two types of demand regulator?

Answer 11

• Pressure demand
• Diluter demand

Question 12

When may the user change the diluter to the give out 100% oxygen?

Answer 12

When there is smoke in the cockpit

Question 13

When may pressure demand systems be used?

Answer 13

Aircraft that fly regularly at altitude above 40,000 ft

Question 14

How is pressure demand oxygen supplied?

Answer 14

Through individual pressure regulators under high pressure

Question 15

How will you know if the oxygen system has been discharged thermally or via the pressure relief?

Answer 15

As the green safety disk will have burst

Question 16

What can be found on an oxygen bottle?

Answer 16

• Shut off valve, slow manual open
• Direct reading gauge
• Thermal compensator connected to the fill line
• Discharge discs

Question 17

What are high and low pressure oxygen lines made from?

Answer 17

High - CRES
Low - Aluminium

Question 18

What distributes the heat when recharging oxygen bottles?

Answer 18

Thermal compensator. This is ONLY during charging

Question 19

How are oxygen bottles tested for continued serviceability?

Answer 19

Hydrostatic testing

Question 20

What is the breathing oxygen tape coding?

Answer 20

Green tape with “BREATHING OXYGEN” written on it, the border has a white background with black rectangles

Question 21

Where are the passenger oxygen bottles located?

Answer 21

They are located in the cargo bay

Question 22

What are the two types of passenger oxygen supply?

Answer 22

• Gaseous
• Chemical oxygen generators

Question 23

Where are the chemical oxygen generators stored?

Answer 23

In the overhead Passenger Service Unit (PSU)

Question 24

What is used to control the oxygen pressure to reduce it to a usable level?

Answer 24

Flow Control Units (FCU)

Question 25

What type of flow are the:
- Cabin masks?
- Flight deck masks?

Answer 25

Cabin masks - Continuous
Flight deck masks - Demand flow

Question 26

In the gaseous system what line transports the pressure push from the FCU to open the PSU door?

Answer 26

The ring line

Question 27

How are the PSU doors opened in the chemical oxygen system?

Answer 27

Solenoid operated door release

Question 28

What is the chemical oxygen generator filled with?

Answer 28

Sodium chlorate

Question 29

What occurs to the oxygen chemical generator when the lanyard is pulled?

Answer 29

Releases a pin which fires a striker

Question 30

What are the 3 functions of the FCU?

Answer 30

• Shut off
• Pressure regulation
• PSU door opening

Question 31

What system utilises bleed air for oxygen?

Answer 31

On Board Oxygen Generating System (OBOGS)

Question 32

What pressure should bottles be replaced at?

Answer 32

50 psi