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A gaseous nitrogen charge is added to a liquid fire extinguishing agent in order to?
Expel the agent from the bottle
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What component holds both a liquid agent and a nitrogen charge in a liquid-agent fire extinguishing container?
Frangible disc
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In a liquid-agent fire extinguisher container, why is the frangible disc undercut into pie shaped sections?
To break cleanly into large pieces
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What is the purpose of a time delay relay that is used on some liquid-agent fire extinguishing systems?
To position the valves
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BANK #2 in a two-shot liquid-agent fire extinguishing system failed to discharge, while BANK #1 discharged normally. The most probably cause of this malfunction is what type of faulty switch?
Discharge selector
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When depressed, which switch on a T-handle fire extinguishing system completes the circut to the squib?
Agent discharge switch
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In the T-handle fire extinguishing system, the two-way check valve is pushed into position by the?
Liquid agent
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In a T-handle liquid-agent fire extinguishing system, what happens when the container pressure becomes two low?
A pressure switch closes
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Air that is trapped in a liquid coolant system has what effect?
Reduces the colling capability of the coolant
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During initial start of a liquid coolant system, the controller timer energizes the solenoid shutoff valve closed for three minutes. The purpose of this action is to?
Allow for system stabilization
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What component of a liquid coolant system is positioned by the temperature of the coolant?
Thermal pilot valve
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In a liquid coolant system, what tells you that the liquid coolant filter is dirty?
A mechanical pop-up indicator is activated
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When maintaining a liquid coolant system, over-torquing clamps may cause what to happen?
Damage or failure of the component
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In a liquid coolant system, what is the purpose of purging the servicing unit supply hose?
Prevent air from entering the system
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To ensure that a multiplace liferaft will inflate in extremely low temperatures, the inflation cylinder has a charge of?
Nitrogen
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What component of a liferaft inflation cylinder assembly keeps CO2 within the cylinder and permits an unrestricted flow of CO2 to the liferaft?
Discharge valve
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Releasing CO2 from a liferaft cylinder into a liferaft is normally done by activating the?
Cam
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What action do you take if you find corrosion on the inside of the liferaft inflation cylinder?
Tag the cylinder for overhaul
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Liferaft inflation cylinders having an outside diameter of less than 2 inches and a length of less than 2 feet do not require?
Hydrostatic testing
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After recharging a liferaft inflation cylinder, but before returning it to serviceable status, what do you do to the cylinder?
Test for leaks, then reweigh after 24 hours
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Describe oxygen in its natural state
Colorless, tasteless, odorless
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At altitudes between 10,000 and 15,000 feet, what is the greatest danger from hypoxia?
Errors in judgement
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A complete loss of oxygen in a gaseous oxygen system is prevented by what type of valve?
Check valve
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Supply and distribution tubing for aircraft oxygen systems is identified by cellulose tape in what colors?
Green and white
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What valve decreases system pressure in a high-pressure oxygen system?
Reducer valve
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In a high-pressure oxygen system, the tubing between the filler valve and the pressure reducer valve is made of?
Copper alloy
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In a molecular sieve oxygen generating system, water droplets from the air are removed by a?
MSOGS concentrator inlet filter
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Liquid oxygen converts to gaseous oxygen at an expansion ratio of?
860 to 1
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In a liquid oxygen system, what component has the ability to draw gaseous oxygen from the top of the converter for breathing purposes?
Pressure opening valve
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On an aircraft liquid oxygen system, the handle on a manually operated buildup and vent valve is designed to prevent?
The filler access door from closing in the vent position
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Which one of these is a disadvantage of a continuous-flow oxygen regulator?
It wastes oxygen
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When the cabin altitude of an aircraft reaches 30,000 feet, what component in the pressure-demand oxygen regulator causes 100 percent oxygen to be delivered to the user?
Diluter aneroid
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When the PBG/ON/OFF toggle of an oxygen system is placed in the PBG position, what causes the availability of oxygen and pressure breathing?
Positive signal from the anti-g valve
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Which oxygen system allows oxygen to flow automatically to the distribution system when cabin altitude reaches 12,500 feet?
Troop system
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An H-2 emergency assembly (bailout bottle) supplies oxygen to the user for a maximum of about how many minutes?
10
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Assume a capacitance indicating system is being used to indicate the quantity of liquid oxygen in a converter. When the quantity of liguid oxygen in the converter decreases, what happens to the capacitance of the probe?
It decreases
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A liquid oxygen system's pressure fails to stabilize at 110 psi. This could be caused by a failure of the?
Converter relief valve
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A liquid oxygen system is continuously venting gaseous oxygen overboard. The most probable malfunction is a faulty?
Pressure closing valve
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You should replace an oxygen mask-to-regulator connector if the no-go portion of the go-no-go gage passes through the?
Smallest internal port
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The minimum required clearance between oxygen system tubing and aircraft control cables is?
2 inches
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To reduce vibration and prevent chafing of oxygen system tubing, you should secure long runs of oxygen tubing at least every?
15 inches
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How do you loosen a B-nut from a fitting on the tubing of an oxygen regulator?
Hold the fitting to prevent twisting of the tubing
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An aircraft gaseous oxygen system must be purged only with?
Gaseous oxygen
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On a gaseous oxygen servicing trailer, what controls the flow of oxygen?
Servicing valves
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On a gaseous oxygen servicing trailer, what does the purifier assembly remove from gaseous oxygen?
Moisture
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When servicing a gaseous oxygen system, you should gradually increase the servicing pressure in order to prevent?
Overheating of oxygen cylinders
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What is the service test pressure for a low-pressure gaseous oxygen system leak test?
425 to 450 psi
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When performing a high-pressure gaseous oxygen leak test, what minimum amount of time should you wait before taking the second system pressure reading?
24 hours
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An oxygen regulator is considered to be leaking excessively if tester soap bubbles burst in less than how many seconds?
10
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In an oxygen system, a leak test solution indicates a leak by?
Bubbling
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The oxygen regulator field tester primarily uses what type of measurement to determine the condition of an oxygen regulator?
Pneumatic
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Heat gain and liquid oxygen boil-off is minimized in the annular space of a TMU-27/M liquid oxygen storage and transfer cart by?
Aluminized mylar insulation
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In a cryotainer, the transfer of heat by conduction is slowed with the use of?
Stainless steel support struts
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What control valve on an oxygen storage and transfer unit is closed only during head pressure buildup or the transfer of liquid oxygen?
Vent valve
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What determines how often you clean a cryotainer fill-drain and service line filter?
Cleanliness of the liquid oxygen
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During an inspection of a cryotainer, you find a faulty pressure guage. What action should you take?
Send the guage to TMDE for calibration
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