301-413

Which component control and monitor the Crew oxygen system?

• No controller

• By Oxygen System control and Monitoring applications (OSCM)

• Monitor by SDAC

Which the function of the Low Pressure Switch in Crew Oxygen System?

• Detected Low Pressure in oxygen distribution line

• Detected discharge status of the oxygen cylinder

• Detected Low Pressure in oxygen distribution line and confirm the position of the shut off valve

How many input signal for start of the passenger oxygen system?

• One input from CPCS, one from the atmospheric pressure transducer and one from MASK MAN ON

• One input from CPCS only

• One input from MASK MAN ON P/B only

During disconnection/reconnection of an oxygen line connector, you use:

• One wrench

• Two wrenches: one for the nut and one for the counter nut to avoid force onto the material

• Two wrenches: one for the nut and bolt to avoid force onto the material

The crew oxygen system has:

• a)  One system for the CAPT, F/O, Third Occupant and Fourth Occupant

• a)  Two subsystems: Left hand oxygen subsystem for the CAPT, Fourth Occupant and right hand oxygen subsystem for the F/O, the Third Occupant

• a)   

  b) Two subsystems: Forward oxygen subsystem for the CAPT, F/O and aft oxygen subsystem for the

How to check the status of the passenger oxygen generator?

• By an indicator dot on its starter side

• By a pressure switch on generator

• Can not check its status

Memos displayed on the WD are:

• OXY PAX SYS ON (green) when the cabin oxygen is activated by the CPCS cabin low pressure data

• OXY PAX SYS ON (amber) when the cabin oxygen is activated by the atmospheric transducer (TPA) or the "Mask Man On" P/B Switch (CPCS data not available)

• Both answers are correct

A reset of the passenger oxygen system

• Can only be done on ground (or if the cabin altitude is below 12000ft)

• Can only be done in flight (the cabin altitude is above 12000ft)

• Can be done on ground or in flight at any time

When working on gaseous oxygen system, you must: (A, B1, B2)

• Stop all refueling, all repairs on fuel and hydraulic systems, all procedures that use flammable material

• Do not operate external lightings

• Do not operate HF system and carry out maintenance on HF system

Overboard discharge indicator shows the overpressure that occurs: (A, B1, B2)

• In the oxygen cylinder

• In the oxygen distribution manifold

• In the oxygen cylinder or in the oxygen distribution manifold