ATA 35 Oxygen

Question 1

What is considered an oxygen-enriched atmosphere?

Answer 1

Oxygen percentage is 24% and above

Question 2

What tests are carried out on the flight crew oxygen system?

Answer 2

Push the reset test slider, the blinker turns yellow and goes black again showing that the regulator is leak tight

Press the harness inflation control, the blinker turns yellow and goes black again showing that the harness is leak tight

Pressing the emergency rotation knob tests the on demand system, but activating the loudspeakers and the interphone, the microphone can also be tested

Question 3

How long will the two types of passenger oxygen generators provide oxygen for?

Answer 3

15 minutes or 22 minutes

Question 4

What occurs where cabin altitude is more than 14000 ft and relays 8WR and 9WR remain energised after the delay of 30 seconds?

Answer 4

• Relay 15WR is operated
• Amber FAULT light comes on
• The SYS white ON light and PA systems are still on

Question 5

What must be done if relays 8WR and 9WR remain energised after the delay of 30 seconds causing the amber FAULT light to come on the OXY/TMR RESET P/BSW?

Answer 5

Flight crew have to press the OXY/TMR RESET P/BSW to reset the system, turning the taped announcement off and turning the SYS ON light off

Question 6

What is the purpose of relay 25WR in the passenger oxygen system?

Answer 6

Interconnects the LH and RH latch assembly electrical circuits

Question 7

What will the thermal indicators tell you about the passenger chemical oxygen system?

Answer 7

Either:

Black - Burned out
Yellow - New

Or

Blue - Burned out
Pink - New

Question 8

How does the serviceability indicator show that the crew portable breathing equipment box has been unopened?

Answer 8

It breaks after opening

Question 9

How is the crew portable breathing equipment system activated?

Answer 9

By a lanyard

Question 10

What are the three parts of the crew portable breathing equipment?

Answer 10

• Hood
• Inner mask
• KO2 cartridge

Question 11

What kind of mask provides oxygen for therapeutic purposes?

Answer 11

Continuous-flow first aid oxygen mask

Question 12

When does the pressure switch in the flight crew oxygen system activate and what does this cause?

Answer 12

When the oxygen supply decreases to 50 ± 5 psi

Warning signal REGUL LO PR to the ECAM DOOR/OXY page