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FAA POWERPOINT ORAL (ASA) EXAM 2025 LATEST
STUDYGUIDE ACTUAL QUESTIONS AND CORRECT
VERIFIED ANSWERS GRADE A GUARANTEE PASS
The horizontally opposed engine has a much smaller frontal area and is easier to streamline than a radial engine. - CORRECT ANSWER What is the main advantage of a horizontally opposed engine over a radial engine for powering modern aircraft? Six. - CORRECT ANSWER How many throws are there in the crankshaft of a six-cylinder horizontally opposed engine? A master rod connects the single throw of the crankshaft with a piston. All of the other pistons are connected to the master rod with link rods. - CORRECT ANSWER What kind of connecting rod arrangement is used in a radial engine? Gray cast iron. - CORRECT ANSWER Of what material are most piston rings made?
High-pressure engine oil is directed into the propeller through the governor - CORRECT ANSWER What is done to cause a Hydromatic propeller to feather? Oil is allowed to drain out of the propeller. - CORRECT ANSWER What is done to cause a McCauley propeller to feather? Toward low pitch. - CORRECT ANSWER Does centrifugal twisting moment on a propeller blade tend to move the blades toward high pitch or toward low pitch? Toward high pitch. - CORRECT ANSWER Do the counterweights on a propeller tend to move the blades toward high pitch or toward low pitch? Basically, it is the control system. A controllable- pitch propeller uses a manually operated oil valve to control the pitch, and a constant-speed propeller uses a governor to control the valve. - CORRECT ANSWER What is the difference between a controllable propeller and a constant-speed propeller?
of a propeller that is mounted on a tapered or splined shaft? The compression of the speeder spring. - CORRECT ANSWER What is adjusted inside the governor for a constant speed propeller to change the speed at which the propeller is operating? The accumulator stores oil under pressure when the engine is operating normally. This oil is used to help the propeller blades move toward low pitch when the propeller is being unfeathered. - CORRECT ANSWER What is the function of the accumulator that is used with some McCauley feathering propellers? This is the mode of ground operation, and it includes starting, taxiing, and ground reverse operation. - CORRECT ANSWER What is meant by the beta range of operation of a turboprop propeller? This is the in-flight mode of operation from takeoff
to landing - CORRECT ANSWER What is meant by the alpha range of operation of a turboprop propeller? It is the face of the blade. - CORRECT ANSWER Is the flat surface of a propeller blade the face of the blade or the back of the blade? A spring-loaded latch mechanism prevents the blades moving into the feather position when the engine is shut down on the ground. In the air, aerodynamic forces keep the propeller rotating, and centrifugal force holds the blades unlatched so they can move to the feather position when oil pressure is taken out of the propeller. - CORRECT ANSWER What keeps a McCauley feathering propeller from feathering when the engine is shutdown on the ground? Hydraulic valve lifters keep all of the clearance out of the valve operating mechanism. This decreases the wear of the valve train components. - CORRECT ANSWER What is the reason for using hydraulic valve lifters in an aircraft engine?
cold clearance. - CORRECT ANSWER Why are both the hot and cold valve clearances given for most radial engines? A piston that is not perfectly round. Its dimension parallel with the wrist pin is several thousandths of an inch less than its dimension perpendicular to the wrist pin. When the piston reaches operating temperature, the metal in the piston pin boss expands enough that the piston becomes perfectly round. - CORRECT ANSWER What is meant by a cam-ground piston? About 30 degrees of crankshaft rotation before the piston reaches top center on the compression stroke. - CORRECT ANSWER Where is the piston in a reciprocating engine when the ignition spark occurs? A wrist pin that is not clamped in either the piston or the connecting rod. Full-floating wrist pins are kept from scoring the cylinder walls by soft metal plugs in their ends. - CORRECT ANSWER What is meant by a full-floating wrist pin?
By using more than one spring and having the wire diameter and pitch of the springs different, valve float is minimized. The springs have different resonant frequencies, so at least one spring will always be exerting a force on the valve. - CORRECT ANSWER Why do most aircraft reciprocating engines use more than one spring on each valve? Excessive clearance will cause the valve to open late and close early. - CORRECT ANSWER Would excessive valve clearance cause the valves to open early or late? Valve overlap allows the inertia of the exhaust gases leaving the cylinder to help the fresh induction charge start flowing into the cylinder. - CORRECT ANSWER What is the purpose of valve overlap in a reciprocating engine? Compression rings, oil control rings, and oil wiper
rings and the cylinder walls, and the seal between the intake and exhaust valves and their seats. - CORRECT ANSWER Why is a compression check important for determining the condition of an aircraft reciprocating engine? The ratio of the volume of the cylinder with the piston at the bottom of its stroke to the volume with the piston at the top of its stroke. - CORRECT ANSWER What is meant by the compression ratio of a reciprocating engine? The hot section and the cold section. - CORRECT ANSWER What are the two basic sections of a turbine engine? Axial-flow and centrifugal. - CORRECT ANSWER What are the two basic types of compressors that are used in aircraft turbine engines?
The stators convert some velocity energy into pressure energy and change the direction of the air so it is proper for the next stage of rotors - CORRECT ANSWER What is the purpose of the stators in an axial-flow compressor? Can-type, annular-type, and can-annular-type. - CORRECT ANSWER What are three types of combustors used on aircraft turbine engines? Two. - CORRECT ANSWER How many igniters are there normally in an aircraft turbine engine? The turbine nozzle directs the hot gases as they leave the combustors so they will turn the turbine wheel with maximum efficiency - CORRECT ANSWER What is the main purpose of the turbine nozzle in an aircraft turbine engine? A turboshaft engine that has a turbine wheel, or stage
the gas generator portion of the engine - CORRECT ANSWER What is meant by a turbofan engine? In the FAA-approved service manual issued by the manufacturer of the engine. - CORRECT ANSWER Where can you find the limits of repair allowed for the compressor blades of an aircraft turbine engine? If the engine is shut down while it is hot, there is a possibility that the shroud will contract around the turbine wheel and seize the rotor. - CORRECT ANSWER Why is it important that a turbojet engine be allowed to cool before it is shut down after it has been operated at a high power setting? A start in which ignition occurs, but the engine does not accelerate to a self-sustaining speed. - CORRECT ANSWER What is meant by a hung start in a turbine engine?
A start in which ignition occurs, but the internal temperatures go high enough that they can damage the engine. - CORRECT ANSWER What is meant by a hot start in a turbine engine? A condition of permanent elongation of the turbine blades. Creep is caused by the high temperatures and the high centrifugal loading imposed on the blades. - CORRECT ANSWER What is meant by creep of the turbine blades? An emulsion-type cleaner is sprayed through the engine while it is being motored by the starter or operated at a low speed. The wash is followed by a clean water rinse. More vigorous cleaning is done by injecting a mild abrasive, such as ground-up apricot pits or walnut shells, into the engine while it is operating at low speed. - CORRECT ANSWER How is the compressor of a turbine engine cleaned? Into the compressor inlet and into the engine diffuser case. - CORRECT ANSWER Where is water injected into a turbine engine for cooling purposes?
instruction for hire - CORRECT ANSWER What determines whether or not a 100hour inspection is required for an aircraft? In Appendix D of 14 CFR Part 43. - CORRECT ANSWER Where can you find a list of items that should be inspected on a 100-hour and an annual inspection of an aircraft engine? In the Type Certificate Data Sheets for the engine. - CORRECT ANSWER In what publication can a mechanic find the operating limitations for an aircraft engine? An A&P mechanic who holds an Inspection Authorization. - CORRECT ANSWER Who is authorized to perform the powerplant inspection that is required for an annual inspection? A differential compression check and a direct compression check. - CORRECT ANSWER What are two types of compression checks that can be performed on an aircraft reciprocating engine?
The combustion section is checked for cracks or distortion. The turbine wheel, the turbine case, and the exhaust section are checked for cracks, indications of overheating, and any indication of warpage, erosion, or burning. - CORRECT ANSWER What items are checked in a hot section inspection of a turbine engine? Cracks that are caused by the high concentration of heat in the hot section. - CORRECT ANSWER What is the most common type of damage that is found in the hot section of a turbine engine? Yes. - CORRECT ANSWER Is the use of a checklist required when performing an annual or 100-hour inspection on an aircraft engine? The inside of the cylinders must be inspected with a borescope. The oil must be changed and the filters examined, and the engine given a careful run-up and
against the cylinder head by a spring. - CORRECT ANSWER What are two types of pickups used for measuring the cylinder head temperature of a reciprocating engine? The restrictor damps out pressure pulsations in the oil to keep the needle from oscillating. - CORRECT ANSWER Why do most engine oil pressure gages have a restrictor in the line between the engine and the instrument? A pressure gage that measures the pressure drop across injector nozzles. - CORRECT ANSWER What is used to measure the fuel flow of a horizontally opposed, fuel-injected reciprocating engine? There is an open in the bulb circuit that causes the instrument to see an infinite resistance. The higher the resistance in the bulb circuit, the higher the temperature indication. - CORRECT ANSWER What is indicated if the needle of a ratiometer-type oil temperature indicator pegs to the high side of the
dial as soon as the aircraft master switch is turned on? A set of thermocouples arranged in an averaging circuit. These thermocouples are installed in the tail pipe of the engine. - CORRECT ANSWER What type of indicating system is used to measure the exhaust gas temperature of a turbine engine? The temperature of the outside air - CORRECT ANSWER What should a thermocouple-type cylinder head temperature indicator read when the engine is not operating? A torquemeter is actually an oil pressure gage. The pressure it measures is produced in a torque sensor and is proportional to the amount of strain in the torsional shaft that drives the reduction gears of the
