AMS 263 FINAL EXAM PAPER 2025/2026 QUESTIONS WITH
SOLUTIONS GRADED A+
✔✔The pumps that are used to provide positive pressure to the inlet side of the engine
are called - ✔✔boost pumps
✔✔The four types of fuel quantity indicators are - ✔✔sight glass, mechanical, electrical,
electronic capacitance
✔✔T/F The most complex type of fuel system is the gravity feed - ✔✔false
✔✔Which of the answers below does not reduce or eliminate vapor lock - ✔✔sharp
bends or steep rises
✔✔T/F Fuel sumps should be checked for water and contaminants right after fueling -
✔✔True
✔✔What are two reasons Prist is added to fuel that is used in aircraft - ✔✔kills the scum
forming bacteria
✔✔Which one of the answers below is not an example of fuel tanks used on general
aviation aircraft - ✔✔built up
✔✔A gravity feed system must be able to flow_____% of the takeoff fuel consumption
of the engine - ✔✔150%
✔✔A pump-feed fuel system must be able to flow at least _______% of the takeoff fuel
flow - ✔✔125%
✔✔T/F A detent in the selector valve operating mechanism gives the pilot a positive
indication by feel when the selector valve is in the full ON and full OFF position - ✔✔true
✔✔T/F A built up tank is part of the wing structure in which all of the seams and joints
are sealed so they will be fuel tight - ✔✔false
✔✔The function of an expansion valve in a Freon cooling system is to act as a metering
device and to - ✔✔reduce the pressure of the liquid freon
✔✔The purpose of the dump valve in a pressurized aircraft is to relieve - ✔✔all positive
pressure from the cabin
✔✔How can it be determined that a vapor-cycle cooling system is charged with the
proper amount of Freon - ✔✔Air bubbles in the sight glass disappear
, ✔✔Frost or ice buildup on the evaporator in a vapor-cycle cooling system is most likely
caused by - ✔✔inadequate airflow through the evaporator
✔✔What is ventilating air used for on a combustion heater - ✔✔carries heat to where it
is needed
✔✔The position of the thermostatic expansion valve in a vapor-cycle cooling system is
determined by temperature and pressure of the - ✔✔freon in the discharge side of the
evaporator
✔✔Where does the fuel come from that is used in an aircraft combustion heater -
✔✔aircraft fuel tanks
✔✔In a vapor-cycle cooling system, where is cooling air obtained for the condenser -
✔✔ambient air
✔✔If the cabin rate of climb is too great, the control should be adjusted to cause the -
✔✔outflow valve to close faster
✔✔Which statement about Airworthiness Directives (AD's) is true - ✔✔compliance with
ADs are mandatory
✔✔When recharging a Freon system, what is the danger if the can is turned upside
down in order to speed up the process - ✔✔liquid refrigerant could enter the
compressor
✔✔When checking a Freon air conditioning system for leaks, use of flame-detection
system strongly discouraged because - ✔✔lethal mustard gas can be produced
✔✔Which of these components of a Freon system removes the heat from the
refrigerant an dissipates it into the atmosphere - ✔✔condenser
✔✔What is to be done if an aircraft on a 100 hour inspection program exceeds its 100
hour and is not inspected until 108 hours - ✔✔Eight hours must be deducted from the
next inspection period, which would make the next 100 insection due in 92 hours
✔✔What is the condition of the refrigerant as it enters the condenser of a vapor-cycle
cooling system - ✔✔high pressure vapor
✔✔What is the condition of the refrigerant as it enters the evaporator of a vapor-cycle
cooling system - ✔✔low pressure liquid
SOLUTIONS GRADED A+
✔✔The pumps that are used to provide positive pressure to the inlet side of the engine
are called - ✔✔boost pumps
✔✔The four types of fuel quantity indicators are - ✔✔sight glass, mechanical, electrical,
electronic capacitance
✔✔T/F The most complex type of fuel system is the gravity feed - ✔✔false
✔✔Which of the answers below does not reduce or eliminate vapor lock - ✔✔sharp
bends or steep rises
✔✔T/F Fuel sumps should be checked for water and contaminants right after fueling -
✔✔True
✔✔What are two reasons Prist is added to fuel that is used in aircraft - ✔✔kills the scum
forming bacteria
✔✔Which one of the answers below is not an example of fuel tanks used on general
aviation aircraft - ✔✔built up
✔✔A gravity feed system must be able to flow_____% of the takeoff fuel consumption
of the engine - ✔✔150%
✔✔A pump-feed fuel system must be able to flow at least _______% of the takeoff fuel
flow - ✔✔125%
✔✔T/F A detent in the selector valve operating mechanism gives the pilot a positive
indication by feel when the selector valve is in the full ON and full OFF position - ✔✔true
✔✔T/F A built up tank is part of the wing structure in which all of the seams and joints
are sealed so they will be fuel tight - ✔✔false
✔✔The function of an expansion valve in a Freon cooling system is to act as a metering
device and to - ✔✔reduce the pressure of the liquid freon
✔✔The purpose of the dump valve in a pressurized aircraft is to relieve - ✔✔all positive
pressure from the cabin
✔✔How can it be determined that a vapor-cycle cooling system is charged with the
proper amount of Freon - ✔✔Air bubbles in the sight glass disappear
, ✔✔Frost or ice buildup on the evaporator in a vapor-cycle cooling system is most likely
caused by - ✔✔inadequate airflow through the evaporator
✔✔What is ventilating air used for on a combustion heater - ✔✔carries heat to where it
is needed
✔✔The position of the thermostatic expansion valve in a vapor-cycle cooling system is
determined by temperature and pressure of the - ✔✔freon in the discharge side of the
evaporator
✔✔Where does the fuel come from that is used in an aircraft combustion heater -
✔✔aircraft fuel tanks
✔✔In a vapor-cycle cooling system, where is cooling air obtained for the condenser -
✔✔ambient air
✔✔If the cabin rate of climb is too great, the control should be adjusted to cause the -
✔✔outflow valve to close faster
✔✔Which statement about Airworthiness Directives (AD's) is true - ✔✔compliance with
ADs are mandatory
✔✔When recharging a Freon system, what is the danger if the can is turned upside
down in order to speed up the process - ✔✔liquid refrigerant could enter the
compressor
✔✔When checking a Freon air conditioning system for leaks, use of flame-detection
system strongly discouraged because - ✔✔lethal mustard gas can be produced
✔✔Which of these components of a Freon system removes the heat from the
refrigerant an dissipates it into the atmosphere - ✔✔condenser
✔✔What is to be done if an aircraft on a 100 hour inspection program exceeds its 100
hour and is not inspected until 108 hours - ✔✔Eight hours must be deducted from the
next inspection period, which would make the next 100 insection due in 92 hours
✔✔What is the condition of the refrigerant as it enters the condenser of a vapor-cycle
cooling system - ✔✔high pressure vapor
✔✔What is the condition of the refrigerant as it enters the evaporator of a vapor-cycle
cooling system - ✔✔low pressure liquid
