FINAL EXAM AMT 113 QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026
What are the cabin pressurization modes of operation? - Answers Differential, unpressurized, and
isobaric.
How can instrument static system leakage be detected? - Answers By observing the rate of change in
indication of the altimeter after suction has been applied to the static system.
What is true about an electronic capacitance-type fuel quantity indicating system? - Answers It has
no moving parts in the tank.
How is fuel jettisoning past limits prevented? - Answers By dump limit valves or a low-level circuit.
Which fire-extinguishing agent is considered to be the least toxic? - Answers Bromotrifluoromethane
(Halon 1301).
What unit in a vapor-cycle cooling system serves as a reservoir for the refrigerant? - Answers
Receiver-dryer.
What should be used to melt ice in a turbine engine if the compressor is immobile? - Answers Hot air.
What is the condition of the refrigerant as it leaves the condenser of a vapor-cycle cooling system? -
Answers High-pressure liquid.
What is the primary function of the cabin pressurization system outflow valve? - Answers To maintain
the desired cabin pressure.
What is an acceptable pressure for a fire extinguisher at 33 degrees F? - Answers 215 to 302 psig.
What may happen if oxygen bottle pressure drops below a specified minimum? - Answers Moisture
may collect in the bottle.
What should be used to remove flux from an aluminum tank after welded repairs? - Answers Five
percent solution of nitric or sulfuric acid.
How can it be determined that a vapor-cycle cooling system is charged with the proper amount of
freon? - Answers Air bubbles in the sight glass disappear.
What controls the amount of oxygen delivered to a mask in a continuous-flow oxygen system? -
Answers Calibrated orifice.
What type of signals are transmitted between components in an EFIS? - Answers Digital signals.
What specifications must a high-pressure oxygen cylinder meet for installation in an airplane? -
Answers Department of Transportation.
How is the thermal discharge of a built-in fire-extinguisher system detected? - Answers A rupture of
the red plastic disk in the thermal discharge line.
What causes the warning system to operate in a fire-detection system? - Answers A thermocouple
generates a small current when heated.
What operating mechanism is found in a hydraulic pressure gauge? - Answers Bourdon tube.
What is an aircraft's integral fuel tank? - Answers A part of the aircraft structure.
What is the purpose of a float-operated transmitter installed in a fuel tank? - Answers It sends an
electric signal to the fuel quantity indicator.
What are the four general types of fuel quantity gauges? - Answers Sight glass, mechanical, electrical,
and electronic.
What are the components used to heat water supply lines and waste water tanks? - Answers Heater
blankets and inline heaters.
What indicates that a vapor-cycle cooling system is leaking freon? - Answers Oil seepage.
What is the temperature range for a fire-extinguishing agent storage container with a pressure of 330
psig? - Answers 45 to 73 degrees F.
What does a fuel totalizer indicate? - Answers The amount of fuel in all tanks.
What controls the operation of the cabin pressure regulator? - Answers Cabin altitude.
How is fuel jettisoning usually accomplished? - Answers Through a common manifold and outlet in
each wing.
What is the purity level of oxygen used in aircraft systems? - Answers At least 99.5 percent pure and
practically water free.
In what position should the bottle be placed when adding liquid freon to a vapor-cycle cooling
system? - Answers Vertical with the outlet at the bottom.
What should be done if a fire extinguisher container's pressure is not within limits? - Answers Replace
the extinguisher container.
What mixture may be used as a deicing fluid to remove frost from an aircraft surface? - Answers
Ethylene glycol and isopropyl alcohol.
, What is the condition of the refrigerant as it leaves the evaporator of a vapor-cycle cooling system? -
Answers Low-pressure vapor.
What prevents a sudden loss of pressurization if there is a loss of the pressurization source? -
Answers Delivery air duct check valve.
What procedure should be avoided when entering an aircraft's fuel tank? - Answers Conduct the
defueling and tank purging operation in an air-conditioned building.
When does the stall warning system begin to warn the pilot? - Answers When a stall is imminent.
How does the vapor pressure of aviation gasoline compare to automotive gasoline? - Answers Lower
than the vapor pressure of automotive gasoline.
What can result if microbial growth exists in a jet fuel tank? - Answers Interference with fuel flow,
interference with fuel quantity indicators, and electrolytic corrosive action in a metal tank.
What is necessary to effectively troubleshoot a fuel pressure warning system? - Answers The
manufacturer's maintenance manuals.
How does the air-cycle cooling system produce cold air? - Answers By extracting heat energy across
an expansion turbine.
What component might be damaged if liquid refrigerant is introduced into the low side of a vapor-
cycle cooling system when the pressure is too high? - Answers Compressor.
What is one check for proper operation of a pitot-static tube heater after replacement? - Answers
Ammeter reading.
Prior to installation of a pneumatic surface-bonded type deicer boots, what should an aviation
mechanic do? - Answers Remove all paint from the area to be covered by the deicer boot.
How does temperature affect fuel weight? - Answers Cold fuel is heavier per gallon.
What should bonding connections be tested for? - Answers Resistance value.
What maintains normal windshield temperature control in an electrically heated windshield system? -
Answers Thermistors.
What is an aircraft pressurization cycle normally considered to be? - Answers One complete series of
events or operations that recur regularly.
If the liquid level gauge in a vapor-cycle cooling system indicates a low freon charge, what should be
done? - Answers Be operated for a period of time to reach a stable condition and then the freon level
rechecked.
What may be used to clean deicer boots? - Answers Soap and water.
When routing a fuel line between two rigidly mounted fittings, what should the line do? - Answers
Have at least one bend between such fittings.
What may be used as a lubricant on oxygen system tapered pipe thread connections? - Answers
Teflon tape.
Why are magnetic compass bowls filled with a liquid? - Answers To dampen the oscillation of the
float.
What is the maximum vapor pressure allowable for an aircraft fuel? - Answers 7 psi.
What do instrument panel shock mounts absorb? - Answers Low-frequency, high-amplitude shocks.
What is required for daily draining of fuel trucks or farms? - Answers Of strainers and sumps is
combined with periodic filter changes and inspection to ensure fuel is contaminant free.
What does the method of mounting aircraft instruments depend on? - Answers Design of the
instrument case.
What is a good practice concerning the inspection of heating and exhaust systems of aircraft? -
Answers Supplement physical inspections with periodic operational carbon monoxide detection tests.
Which oxygen system employs a regulator that operates only when the user inhales? - Answers
Demand-flow system.
What is the purpose of the distributor valve in a deicing system utilizing deicer boots? - Answers To
sequence the deicer boots inflations symmetrically.
What is the function of fuel-boost pumps? - Answers To provide a positive flow of fuel to the engine.
What do the red radial lines on the face of an engine oil pressure gauge indicate? - Answers Minimum
and/or maximum safe operating limits.
Which fire-detection system measures temperature rise compared to a reference temperature? -
Answers Thermocouple.
What is a thermocouple? - Answers A device for measuring temperature.
What type of smoke detectors use light transmissibility measurements? - Answers Photoelectrical
devices.
What are the cabin pressurization modes of operation? - Answers Differential, unpressurized, and
isobaric.
How can instrument static system leakage be detected? - Answers By observing the rate of change in
indication of the altimeter after suction has been applied to the static system.
What is true about an electronic capacitance-type fuel quantity indicating system? - Answers It has
no moving parts in the tank.
How is fuel jettisoning past limits prevented? - Answers By dump limit valves or a low-level circuit.
Which fire-extinguishing agent is considered to be the least toxic? - Answers Bromotrifluoromethane
(Halon 1301).
What unit in a vapor-cycle cooling system serves as a reservoir for the refrigerant? - Answers
Receiver-dryer.
What should be used to melt ice in a turbine engine if the compressor is immobile? - Answers Hot air.
What is the condition of the refrigerant as it leaves the condenser of a vapor-cycle cooling system? -
Answers High-pressure liquid.
What is the primary function of the cabin pressurization system outflow valve? - Answers To maintain
the desired cabin pressure.
What is an acceptable pressure for a fire extinguisher at 33 degrees F? - Answers 215 to 302 psig.
What may happen if oxygen bottle pressure drops below a specified minimum? - Answers Moisture
may collect in the bottle.
What should be used to remove flux from an aluminum tank after welded repairs? - Answers Five
percent solution of nitric or sulfuric acid.
How can it be determined that a vapor-cycle cooling system is charged with the proper amount of
freon? - Answers Air bubbles in the sight glass disappear.
What controls the amount of oxygen delivered to a mask in a continuous-flow oxygen system? -
Answers Calibrated orifice.
What type of signals are transmitted between components in an EFIS? - Answers Digital signals.
What specifications must a high-pressure oxygen cylinder meet for installation in an airplane? -
Answers Department of Transportation.
How is the thermal discharge of a built-in fire-extinguisher system detected? - Answers A rupture of
the red plastic disk in the thermal discharge line.
What causes the warning system to operate in a fire-detection system? - Answers A thermocouple
generates a small current when heated.
What operating mechanism is found in a hydraulic pressure gauge? - Answers Bourdon tube.
What is an aircraft's integral fuel tank? - Answers A part of the aircraft structure.
What is the purpose of a float-operated transmitter installed in a fuel tank? - Answers It sends an
electric signal to the fuel quantity indicator.
What are the four general types of fuel quantity gauges? - Answers Sight glass, mechanical, electrical,
and electronic.
What are the components used to heat water supply lines and waste water tanks? - Answers Heater
blankets and inline heaters.
What indicates that a vapor-cycle cooling system is leaking freon? - Answers Oil seepage.
What is the temperature range for a fire-extinguishing agent storage container with a pressure of 330
psig? - Answers 45 to 73 degrees F.
What does a fuel totalizer indicate? - Answers The amount of fuel in all tanks.
What controls the operation of the cabin pressure regulator? - Answers Cabin altitude.
How is fuel jettisoning usually accomplished? - Answers Through a common manifold and outlet in
each wing.
What is the purity level of oxygen used in aircraft systems? - Answers At least 99.5 percent pure and
practically water free.
In what position should the bottle be placed when adding liquid freon to a vapor-cycle cooling
system? - Answers Vertical with the outlet at the bottom.
What should be done if a fire extinguisher container's pressure is not within limits? - Answers Replace
the extinguisher container.
What mixture may be used as a deicing fluid to remove frost from an aircraft surface? - Answers
Ethylene glycol and isopropyl alcohol.
, What is the condition of the refrigerant as it leaves the evaporator of a vapor-cycle cooling system? -
Answers Low-pressure vapor.
What prevents a sudden loss of pressurization if there is a loss of the pressurization source? -
Answers Delivery air duct check valve.
What procedure should be avoided when entering an aircraft's fuel tank? - Answers Conduct the
defueling and tank purging operation in an air-conditioned building.
When does the stall warning system begin to warn the pilot? - Answers When a stall is imminent.
How does the vapor pressure of aviation gasoline compare to automotive gasoline? - Answers Lower
than the vapor pressure of automotive gasoline.
What can result if microbial growth exists in a jet fuel tank? - Answers Interference with fuel flow,
interference with fuel quantity indicators, and electrolytic corrosive action in a metal tank.
What is necessary to effectively troubleshoot a fuel pressure warning system? - Answers The
manufacturer's maintenance manuals.
How does the air-cycle cooling system produce cold air? - Answers By extracting heat energy across
an expansion turbine.
What component might be damaged if liquid refrigerant is introduced into the low side of a vapor-
cycle cooling system when the pressure is too high? - Answers Compressor.
What is one check for proper operation of a pitot-static tube heater after replacement? - Answers
Ammeter reading.
Prior to installation of a pneumatic surface-bonded type deicer boots, what should an aviation
mechanic do? - Answers Remove all paint from the area to be covered by the deicer boot.
How does temperature affect fuel weight? - Answers Cold fuel is heavier per gallon.
What should bonding connections be tested for? - Answers Resistance value.
What maintains normal windshield temperature control in an electrically heated windshield system? -
Answers Thermistors.
What is an aircraft pressurization cycle normally considered to be? - Answers One complete series of
events or operations that recur regularly.
If the liquid level gauge in a vapor-cycle cooling system indicates a low freon charge, what should be
done? - Answers Be operated for a period of time to reach a stable condition and then the freon level
rechecked.
What may be used to clean deicer boots? - Answers Soap and water.
When routing a fuel line between two rigidly mounted fittings, what should the line do? - Answers
Have at least one bend between such fittings.
What may be used as a lubricant on oxygen system tapered pipe thread connections? - Answers
Teflon tape.
Why are magnetic compass bowls filled with a liquid? - Answers To dampen the oscillation of the
float.
What is the maximum vapor pressure allowable for an aircraft fuel? - Answers 7 psi.
What do instrument panel shock mounts absorb? - Answers Low-frequency, high-amplitude shocks.
What is required for daily draining of fuel trucks or farms? - Answers Of strainers and sumps is
combined with periodic filter changes and inspection to ensure fuel is contaminant free.
What does the method of mounting aircraft instruments depend on? - Answers Design of the
instrument case.
What is a good practice concerning the inspection of heating and exhaust systems of aircraft? -
Answers Supplement physical inspections with periodic operational carbon monoxide detection tests.
Which oxygen system employs a regulator that operates only when the user inhales? - Answers
Demand-flow system.
What is the purpose of the distributor valve in a deicing system utilizing deicer boots? - Answers To
sequence the deicer boots inflations symmetrically.
What is the function of fuel-boost pumps? - Answers To provide a positive flow of fuel to the engine.
What do the red radial lines on the face of an engine oil pressure gauge indicate? - Answers Minimum
and/or maximum safe operating limits.
Which fire-detection system measures temperature rise compared to a reference temperature? -
Answers Thermocouple.
What is a thermocouple? - Answers A device for measuring temperature.
What type of smoke detectors use light transmissibility measurements? - Answers Photoelectrical
devices.
