Quiz on Aircraft Oxygen System Components & Masks

Study Notes

Overview of Crew Oxygen System Components

The crew oxygen system shutoff valve controls oxygen flow to the masks in the flight deck and is a needle valve with a round, knurled knob for control.
The valve can be closed for maintenance operations and is installed on the P6 panel with two threaded fittings for attachment to the oxygen supply line.
The pressure reducing regulator reduces oxygen pressure before it goes into the low pressure supply line and is attached to the thermal compensator coupling on the oxygen cylinder.
The regulator is a diaphragm-controlled metering valve that reduces the oxygen pressure from bottle pressure to 60-85 psig and has a fail-safe relief valve that opens when downstream line pressure is more than 100 psig.
The inlet of the pressure reducing regulator has a filter that does not require servicing and there are no line adjustments for the regulator.
The discharge indication disk is a green plastic disk that shows the oxygen cylinder has discharged due to overpressure when it is missing.
The disk is flush-mounted to the fuselage skin just aft of the electronic equipment compartment external access door and is backed-up by an o-ring and held in place by a snap-ring.
The crew oxygen cylinder is a pressure vessel made of shatterproof mild steel with a frangible disk that protects the bottle from overpressure and a mechanical pressure gauge that shows bottle pressure.
The cylinder is filled to 1850 psig at a temperature of 70F and has a slow opening shutoff valve designed to prevent high temperatures when the valve is operated.
The cylinder is installed on a roller rack with two collars that hold the cylinder to the rack and flareless pressure fittings that connect the cylinder to the thermal compensator coupling and the overpressure discharge tubing.
Servicing the oxygen cylinder is by cylinder replacement with access from the forward cargo compartment and cylinder sizes vary, so the same size cylinder should be used for replacement.
Oxygen cylinder and components should be kept clean and free from any grease, oil, or other contamination, and only approved cleaning, installation, and test materials should be used.

Flight Crew Oxygen System Description for B737-600/700/800

Flight crew oxygen system is independent of other systems.
Oxygen is supplied to flight crew, cabin attendants, and passengers.
High pressure gaseous oxygen is stored in a cylinder in the EE compartment.
Passenger oxygen system uses chemical oxygen generators mounted in PSUs.
Two portable oxygen systems: portable oxygen cylinders with masks, protective breathing equipment (PBE).
Flight crew oxygen system supplies low pressure gaseous oxygen to the crew.
Components include a high pressure oxygen cylinder, temperature compensator cylinder coupling, pressure reducing regulator, pressure transmitter, and overpressure discharge tubing.
Oxygen supply lines are made of seamless stainless steel tubing with flareless fittings.
Flight crew masks have diluter-demand regulators and controls.
Oxygen system maintenance requires special care and cleanliness.
Only aviation grade oxygen should be used.
Contamination inside the system can cause noxious or toxic reactions.

Flight Crew Oxygen System Description for B737-600/700/800

The flight crew oxygen system supplies low pressure gaseous oxygen to the flight crew.
High pressure gaseous oxygen is stored in a cylinder with a pressure gauge and overpressure devices.
A temperature compensating coupling connects the cylinder to the aircraft’s distribution system, and a pressure transducer sends a signal to a gauge for pressure indication.
A pressure regulator on the coupling reduces the oxygen pressure to keep it in the distribution system at a lower pressure.
Low pressure supply lines supply oxygen to a shutoff valve in the flight deck, which controls the flow of oxygen to the mask assemblies in the flight deck.
The flight crew masks have diluter-demand regulators and controls, are modular, independently adjustable, and easy to put on.
The system components are located in the EE compartment, flight compartment, and on the fuselage skin.
Oxygen system maintenance requires special care and cleanliness with approved cleaning materials and procedures outlined in the maintenance manual.
Only aviation grade oxygen is approved for use in the flight crew oxygen system to avoid contamination and freezing of the system.
The oxygen systems supply oxygen for life-sustaining purposes, emergencies, and first aid to the flight crew, cabin attendants, and passengers.
The flight crew oxygen system is independent of other systems and uses high pressure gaseous oxygen, while the passenger oxygen system uses chemical oxygen generators mounted in passenger service units.
There are also two portable oxygen systems available: portable oxygen cylinders with masks and protective breathing equipment.

Description

Test your knowledge on the crew oxygen system components with this informative quiz. From the crew oxygen cylinder to the pressure reducing regulator, this quiz covers all the essential components of the system in detail. Get ready to learn and enhance your understanding of the crew oxygen system with this engaging quiz.