POWERPLANT ASA BAKER SCHOOL FAA
ORAL QUESTIONS STUDY GUIDE 2026 FULL
ANSWERS GRADED A+
⩥ Where does an air turbine starter get its lubricating oil?
Answer: It has a self-contained lubrication system with the oil held in
the starter housing.
⩥ What should a thermocouple cylinder head temp indicator read when
the engine is cold?
Answer: The same as the outside air temperature gauge.
⩥ What do mass flow systems measure?
Answer: The mass of the flow. This is affected by the density of the fuel,
which is intern affected by the fuel temperature.
⩥ In what units is an electronic motorless mass flow meter system
calibrated?
Answer: Pounds per hour of fuel flow.
⩥ What type of instrument system is used for measuring cylinder head
temperature and exhaust gas temperature?
Answer: The thermocouple system.
,⩥ Is it permissible to cold straighten a damaged aluminum alloy prop to
facilitate shipping it to a repair station?
Answer: No, it can cause hidden damage.
⩥ Why are air turbine starters superior to electric starters for a large
turbine engines?
Answer: They are light weight for the torque they produce.
⩥ What is the difference between a controllable prop and a constant
speed prop?
Answer: Basically, it is the control system. A controllable-pitch prop
uses a manually operated oil valve to control the pitch, and a constant-
speed prop uses a governor to control the valve
⩥ Where are most APU located in modern jet transport aircraft?
Answer: In the tail cone of the fuselage.
⩥ What kind of indicating system is used to measure oil temperature in a
small single engine general aviation airplane?
Answer: A sealed system in which a bulb partially filled with a highly
volatile liquid is installed inside the oil strainer. The bulb is connected to
a pressure gauge by a copper tube. The pressure of the gas above the
liquid is proportional to the temperature of the oil that surrounds the
bulb, and the pressure gauge is calibrated in terms of temperature.
, ⩥ How is most of the troubleshooting done for a modern APU?
Answer: By the fault codes generated by the FADEC.
⩥ Where do you find a list of lubricants that are approved for use in a
constant speed prop?
Answer: Maintenance manual for the prop
⩥ What is the extent of the repairs a mechanic with a PowerPlant rating
can make to a prop?
Answer: Only minor repairs or alterations.
⩥ What malfunction in the ignition system would cause an aircraft
reciprocating engine to continue to run after the ignition switch is placed
in the off position?
Answer: The ignition switch is not grounding the magneto primary
circuit.
⩥ Why is stranded wire rather than solid wire used in most power plant
electrical systems?
Answer: Solid wire is likely to break when it is subjected to vibration.
⩥ What document would you use to find the safety procedures to follow
when replacing an igniter plug in an APU?
ORAL QUESTIONS STUDY GUIDE 2026 FULL
ANSWERS GRADED A+
⩥ Where does an air turbine starter get its lubricating oil?
Answer: It has a self-contained lubrication system with the oil held in
the starter housing.
⩥ What should a thermocouple cylinder head temp indicator read when
the engine is cold?
Answer: The same as the outside air temperature gauge.
⩥ What do mass flow systems measure?
Answer: The mass of the flow. This is affected by the density of the fuel,
which is intern affected by the fuel temperature.
⩥ In what units is an electronic motorless mass flow meter system
calibrated?
Answer: Pounds per hour of fuel flow.
⩥ What type of instrument system is used for measuring cylinder head
temperature and exhaust gas temperature?
Answer: The thermocouple system.
,⩥ Is it permissible to cold straighten a damaged aluminum alloy prop to
facilitate shipping it to a repair station?
Answer: No, it can cause hidden damage.
⩥ Why are air turbine starters superior to electric starters for a large
turbine engines?
Answer: They are light weight for the torque they produce.
⩥ What is the difference between a controllable prop and a constant
speed prop?
Answer: Basically, it is the control system. A controllable-pitch prop
uses a manually operated oil valve to control the pitch, and a constant-
speed prop uses a governor to control the valve
⩥ Where are most APU located in modern jet transport aircraft?
Answer: In the tail cone of the fuselage.
⩥ What kind of indicating system is used to measure oil temperature in a
small single engine general aviation airplane?
Answer: A sealed system in which a bulb partially filled with a highly
volatile liquid is installed inside the oil strainer. The bulb is connected to
a pressure gauge by a copper tube. The pressure of the gas above the
liquid is proportional to the temperature of the oil that surrounds the
bulb, and the pressure gauge is calibrated in terms of temperature.
, ⩥ How is most of the troubleshooting done for a modern APU?
Answer: By the fault codes generated by the FADEC.
⩥ Where do you find a list of lubricants that are approved for use in a
constant speed prop?
Answer: Maintenance manual for the prop
⩥ What is the extent of the repairs a mechanic with a PowerPlant rating
can make to a prop?
Answer: Only minor repairs or alterations.
⩥ What malfunction in the ignition system would cause an aircraft
reciprocating engine to continue to run after the ignition switch is placed
in the off position?
Answer: The ignition switch is not grounding the magneto primary
circuit.
⩥ Why is stranded wire rather than solid wire used in most power plant
electrical systems?
Answer: Solid wire is likely to break when it is subjected to vibration.
⩥ What document would you use to find the safety procedures to follow
when replacing an igniter plug in an APU?
