Engines
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| In what position should the crankshaft be when a magneto is being timed to the engine? | show 🗑
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| What is the purpose of a cold cylinder check? | show 🗑
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| show | Idling RPM and manifold pressure, engine acceleration, maximum static RPM andmanifold pressure, magneto drop, ignition switch safety check, propeller pitch change, propeller feathering, oil pressure, fuel pressure, and fuel flow.
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| How can you determine the firing order of an 18-cylinder radial engine? | show 🗑
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| What are two main causes of a cylinder having low compression? | show 🗑
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| show | Oil has drained past the piston rings and filled the combustion chamber of cylindersthat are below the center line of the engine, If the crankshaft is turned over with this oil in the cylinder it will lock, and there is a probability that the piston, cy
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| How is a hydraulic lock removed from an aircraft engine? | show 🗑
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| show | It is an ignition system using a magneto with a brush-type distributor and a coil that has no secondary wiring. Low voltage is directed from the magneto to a transformer mounted on the cylinder head. Here the low voltage is boosted to a high voltage and i
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| What is a floating cam ring on a large radial engine? | show 🗑
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| Why is valve clearance adjusted on radial engines, but not on most horizontally opposed engines? | show 🗑
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| Why are both the hot and cold valve clearances given for most radial engines? | show 🗑
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| show | The propeller, lubrication system, ignition system, fuel metering system, cooling system, and the exhaust system.
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| show | Idle RPM and mixture, static RPM, propeller pitch change operation, magneto check, ignition switch safety check, and carburetor heat check.
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| Where can you find the correct grade of fuel and amount of engine lubricating oil for an aircraft engine? | show 🗑
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| What are the basic steps in troubleshooting an engine installation? | show 🗑
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| show | In the engine maintenance manual.
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| Where do you find instructions for removing an engine from an aircraft? | show 🗑
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| What must normally be done to.a nose-wheel airplane before removing an engine? | show 🗑
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| What should be done to the cylinders to protect them from rust and corrosion when preparing the engine for long-time storage? | show 🗑
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| What should be used to cover the ends of fuel and oil lines that have been disconnected from the engine? | show 🗑
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| What is meant by a QEC engine assembly? | show 🗑
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| What is meant by rigging the engine controls so they have some “cushion”? | show 🗑
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| show | a. Before the spark plugs are installed and after the oil tank or sump is filled, turn the engine over with the starter until oil runs out of the fitting to which the oil pressure gage connects.b. Use a pre-oiler tank. Air pressure forces oil through al
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| What is meant by a hot-section inspection? | show 🗑
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| What is meant by on-condition maintenance of a turbine engine? | show 🗑
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| show | • Inspection of the cowling and all air inlet areas and attachment of the engine to the airframe.• Inspection of the inlet guide vanes and the first stage of the compressor or fan blades.• Check for unusual noise when the compressor is rotated.• Ins
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| show | Adjusting the fuel control so the engine develops the correct idle and trim speed RPM.
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| show | A JetCal Analyzer/Trimmer has all of the instrumentation and cables to determine the EGT EPR, and the other parameters specified by the engine manufacturer.
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| show | In the Type Certificate Data Sheet for the engine.
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| show | An approval issued by the FAA for a modification to a type-certificated airframe, engine or component.
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| show | A form FAA 337 must be completed stating that the installation was done in accordance with the specific STC.
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| What are three types of flow-indicating systems used for turbine engines? | show 🗑
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| What do mass flow systems measure? | show 🗑
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| show | Pounds per hour of fuel flow.
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| show | If there are other instrument abnormalities, there are possibly damaged turbine components.
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| show | The components can be repaired only by an FAA approved repair station certificated for the particular instruments.
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| show | In the aircraft maintenance manual.
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| Where in the fuel system is the fuel flow transmitter located? | show 🗑
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| What kind of indicating system is used to measure oil temperature in a small, single-engine, general aviation airplane? | show 🗑
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| show | A thermocouple system.
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| What kind of electrical instrument system is used for measuring oil temperature? | show 🗑
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| What should a thermocouple cylinder-head temperature indicator read when the engine is cold? | show 🗑
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| show | The resistance is critical, it must have the resistance specified on the indicator. This is usually 2 or 8 ohms.
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| show | The pointer should be off scale on the low side.
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| What kind of tachometer is used on most small single-engine airplanes? | show 🗑
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| show | Either a dry cable connecting the indicator to the engine, or a kink in the cable housing.
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| Is it permissible for a mechanic with an airframe and powerplant rating to replace the tachometer cable for a magnetic drag tachometer? | show 🗑
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| show | A three-phase AC electric tachometer.
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| show | The frequency of the AC the tachometer generator produces.
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| What kind of indicator mechanism is used to measure oil pressure? | show 🗑
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| What kind of indicator mechanism is used to measure manifoldpressure? | show 🗑
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| show | The existing barometric pressure as indicated on the altimeter barometric scale when the altimeter pointers are set to the surveyed field elevation.
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| What type of fitting is used to connect an oil pressure gage to the engine? | show 🗑
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| show | A light oil such as kerosine.
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| show | The loss of the light oil in the line between the gage and the engine.
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| show | No, a mechanic is not allowed to make any repairs or alterations to an aircraft instrument.
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| How does a ratiometer-type oil temperature gage measure the temperature of the oil? | show 🗑
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| show | Normally from 1 .to 25 psL
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| show | The rmoswitch system, thermocouple system, thermistor-type continuous-loop system, pneumatic-type continuous-loop system.
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| show | The thermocouple system.
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| Why must the reference junction in a thermocouple fire detection system be thermally insulated? | show 🗑
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| How do you check a thermocouple fire detection system for operation? | show 🗑
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| What would likely cause a false fire alarm in a thermistor-type continuous-loop system? | show 🗑
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| show | Yes, even though it tests bad, it will still indicate the presence of a fire.
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| show | When the test switch is closed, low-voltage AC flows through the tube that encloses the sensitive element. This current heats the element enough for it to release sufficient gas to activate the alarm switch.
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| show | Inspect and replace as needed the continuous-loop element, the controller, and the fire, warning bell and/or light.
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| show | The engine fuel shutoff valve is closed.The generator field relay is tripped.The compressor bleed air valve is closed.The anti-ice valve is closed.The hydraulic supply shutoff valve is closed.The hydraullc pump low-pressure warning lights are tu
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| show | Carbon dioxide (C02).
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| What fire extinguishing agent is used in the high-rate discharge bottles installed in a jet transport aircraft? | show 🗑
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| How is a high-rate discharge bottle of fire extinguishing agent discharged? | show 🗑
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| show | The current used to check the integrity of the electric circuit must not be high enough to ignite the powder charge.
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| What is indicated if the red discharge indicator for a fire extinguishing system is blown out? | show 🗑
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| show | The system has been discharged by actuating the bottle discharge switch.
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| What color and marking is used to idsntify the fluid lines that carry the fire extinguishing agent in an aircraft? | show 🗑
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| When should the brushes in a starter motor be replaced? | show 🗑
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| show | Reverse the polarity of the armature or the field, but not both.
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| show | Brushes and a commutator.
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| What is used as the rectifier to produce direct current in a DC alternator? | show 🗑
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| show | Series wound for maximum stalled-rotor torque.
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| What are two ways wires can be attached to the pins in a cannon plug? | show 🗑
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| Why is stranded wire used rather than solid wire, in most powerplant electrical systems? | show 🗑
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| show | The current-carrying capability of the wire, and the voltage drop caused by current flowing through the wire.
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| What must be done to a DC generator, after it has been overhauled, before it can produce electricity? | show 🗑
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| show | An alternator field is excited by battery current and residual voltage is not used to start the alternator producing current.
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| What is used to protect a wire bundle from chafing where it passes through a hole in a bulkhead or frame? | show 🗑
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| show | Wires passing through these areas are insulated with high-temperature insulation, and the wires are enclosed in some type of protective conduit.
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| What is the minimum separation allowed between a wire bundle and a fluid line that carries combustible fluid or oxygen? | show 🗑
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| Which aircraft electrical circuit does not normally contain a fuse or circuit breaker? | show 🗑
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| show | A single, engine-mounted component that serves as a starter for starting the turbineengine. When the engine is running, the circuitry automatically shifts so it acts as acompound-wound generator.
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| When should aircraft wiring be installed in a conduit? | show 🗑
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| What is meant by a trip-free circuit breaker? | show 🗑
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| show | Forward.
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| show | To prevent the switch from being inadvertently actuated.
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| What is straight mineral oil? | show 🗑
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| What is ashless dispersant (AD) oil? | show 🗑
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| What is synthetic oil? | show 🗑
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| show | No, automotive and aviation oils are formulated for entirely different operating conditions.
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| show | It is a lubricating oil with a viscosity index improver that increases the viscosity of the oil when it is hot and decreases the viscosity when it is cold.
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| show | a. Reduces friction.b. Seals and cushions.c. Removes heat.d. Cleans inside the engine.e. Protects against corrosion.f. Performs hydraulic action.
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| Where can you find the grade of engine oil specified for a particular aircraftl | show 🗑
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| What components in a reciprocating-engine lubrication system must be inspected on a 100-hour or annual inspection? | show 🗑
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| What two instruments show the condition of a reciprocating-engine lubrication system? | show 🗑
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| What must be done to an oil filter when it is removed from the engine? | show 🗑
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| What is a spectrometric oil analysis program? | show 🗑
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| What is the purpose of an air-oil separator, or deaerator, in a turbine engine oil tank? | show 🗑
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| show | A dipstick that measures the quantity of oil in the tank or sump.
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| show | As soon as practical after the engine is shut down.
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| Where is the oil temperature measured on a reciprocating engine? | show 🗑
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| show | A pressure-relief valve senses the desired pressure and sends all of the oil that caused excessive pressure back into the engine sump.
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| Why do engine manufacturers recommend that engine lubricating oil be changed at specific intervals? | show 🗑
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| show | The restricted fitting helps dampen any pulsations in the oil pressure caused by the pump.
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| What is a hot-tank lubrication system for a turbojet engine? | show 🗑
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| What is a cold-tank lubrication system for a turbojet engine? | show 🗑
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| What is the main advantage of a magneto ignition system over a battery ignition system for an aircraft reciprocating engine? | show 🗑
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| What is the function of the capacitor in a magneto? | show 🗑
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| show | The primary circuit is connected to ground.
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| show | Internally timing a magneto consists of adjusting the breaker points so they will open at the instant the rotating magnet is in its E-gap position, and the distributor rotor is in position to direct the high voltage to cylinder number one.
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| In what position should the ignition switch be placed when using a timing light on the magnetos? | show 🗑
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| What type of ignition system is used on most turbine engines? | show 🗑
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| What is the E-gap in magneto timing? | show 🗑
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| show | An impulse coupling is a spring-driven coupling between the magneto and the engine. When the engine is being started, the impulse coupling holds the rotating magnet until the piston passes over its top center position and starts down. The impulse coupling
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| show | Two.
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| What are two types of ignition systems used in turbine engines? | show 🗑
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| show | A low-voltage system.
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| How is the strength of the magnet in a magneto checked? | show 🗑
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| In what position is the magnet in a magneto, when the greatest change in flux density in the coil core takes place? | show 🗑
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| show | In its E-gap position, just a few degrees beyond its neutral position.
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| 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? | show 🗑
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| show | A high-voltage electrical leakage detector.
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| What is an All-Weather spark plug? | show 🗑
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| What is meant by the reach of a spark plug? | show 🗑
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| What is the difference between a hot spark plug and a cold spark plug? | show 🗑
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| What is the advantage of fine-wire spark plugs over massive electrode spark plugs? | show 🗑
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| show | Spark plugs tell a good deal about the internal condition of the cylinders from which they were taken. By knowing the cylinder from which each spark plug came, the mechanic can take the proper action when a spark plug indicates such conditions as detonati
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| show | If the spark plugs are not put in tight enough, there is the possibility of a poor seal; if they are put in too tight, there is danger of cracking the insulation.
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| show | A round wire gage.
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| show | A starter-generator.
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| What happens when the start switch for a turbine engine with a starter- generator is placed in the START position? | show 🗑
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| show | a. The starter relay opens, shutting off current to the ignition exciter and the motor windings in the starter-generator.b. The generator field relay is closed connecting the voltage regulator to the starter- generator.c. The output of the generator f
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| show | The battery voltage is too low to supply enough current to hold the relay engaged.
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| Why are air-turbine starters superior to electric starters for large turbine engines? | show 🗑
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| show | From an APU, GPU, or from a running engine.
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| What is the purpose of the shear section in an air-turbine drive shaft? | show 🗑
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| show | The air shutoff and regulating valve.
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| Where does an air-turbine starter get it lubricating oil? | show 🗑
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| What device in an air-turbine starter warns a technician if there are any metal chips or particlesin the oil? | show 🗑
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| show | a. Power lever angle.b. Compressor inlet total temperature.c. Compressor RPM.d. Burner pressure.
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| show | Adjusting the fuel control for the proper specific gravity of the fuel and for the proper idle and full throttle RPM.
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| show | Supervisory Electronic Engine Control and Full-Authority Digital Electronic ControL
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| show | A Full-Authority Digital Electronic Control (FADEC) is a high-precision digital electronic fuel control that functions during all engine operations. It includes the Electronic Engine Control (EEC) and functions with the Flight Management Computer (FMC) to
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| show | No, this is done by the FADEC.
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| show | Any time there is a decrease in engine thrust, and after any maintenance that the manufacturer specifies as requiring retrimming.
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| Are the instruments installed in an aircraft suitable for use when trimming a turbine engine? | show 🗑
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| show | The data plate specifications for the specific engine. This data was obtained when the engine was calibrated in the manufacturer’s test cell.
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| Where should ambient temperature be measured when trimming a turbine engine? | show 🗑
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| show | It is a fuel pump that senses the ambient air pressure and maintains the fuel pressure a specific amount above this air pressure.
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| show | A malfunctioning accelerator pump.
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| Why do aircraft fuel metering systems for reciprocating engines have mixture controls? | show 🗑
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| show | Teledyne Continental (TCM) system and Precision Airmotive (Bendix) system.
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| What is used in the TCM fuel injection system to control the amount of fuel sent to the nozzles? | show 🗑
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| show | The mass of the air entering the engine acts on an air diaphragm that controls a servo ball valve in the line between the regulator and the flow divider.
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| show | Finger strainers are located in the tank outlet, the main strainer, located at the lowest point in the fuel system, and strainers in the carburetor or fuel injection system.
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| What are two types of fuel heaters used in a jet transport aircraft? | show 🗑
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| show | Centrifugal pumps.
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| What two things are adjusted when setting the idling conditions on a float carburetor? | show 🗑
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| What are three functions of the boost pump in the tank of a jet transportaircraft? | show 🗑
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| Why does ice form in the throat of a float carburetor? | show 🗑
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| show | The less dense, heated air draws the same amount of fuel from the carburetor as cold air, therefore the mixture becomes richer.
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| show | The RPM drops.
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| Why should the use of carburetor heat be limited when operating an engine with the aircraft on the ground? | show 🗑
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| show | In a fuel-injected engine, the liquid fuel evaporates in the intake valve chamber of the hot cylinder head.
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| How is ice prevented from forming on the nose cowl, nose dome and inlet guide vanes of a turbine engine? | show 🗑
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| What does a fuel-injected engine have that prevents the loss of induction air, if the air inlet filter should become covered with ice? | show 🗑
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| What would be the effect on engine operation of an air leak in the intake pipe for one cylinder? | show 🗑
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| Why is it very important that the induction air filters be kept clean and replaced as often as the manufacturer recommends? | show 🗑
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| show | Ram air on one side of the engine is forced by a series of baffles to flow through the fins on the cylinders to a low-pressure area on the other side of the engine.
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| What must be inspected on the cooling system of an air-cooled engine? | show 🗑
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| Why should an air-cooled engine not be run up to high power without the cowling installed? | show 🗑
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| Why do some air-cooled engine installations have cowl flaps? | show 🗑
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| show | In the engine overhaul manual.
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| show | The Pilot’s Operating Handbook.
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| How does a leak appear in an engine exhaust system? | show 🗑
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| How can you check an exhaust system for leaks? | show 🗑
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| How do the components in the exhaust system of a turbocharged engine allow for expansion and contraction due to heat, and at the same time prevent leakage? | show 🗑
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| What type of damage is most common in the exhaust system of a reciprocating engine? | show 🗑
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| show | Open, so as much exhaust as possible will bypass the turbine.
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| show | There is a danger of recirculathg the exhaust gases, and of the engine ingesting foreign objects stirred up by the high-velocity gases.
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| What is a mechanical-blockage thrust reverser? | show 🗑
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| show | A portion of the fan cowl moves rearward, and a series of blocker doors deflect the fan discharge air through fan cascades that direct the discharge air forward. At the same time, blocker doors shut off the flow of gases from the core engine and deflect i
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| show | This is the engine in a multi-en gine airplane whose RPMs follow those set on the master engine.
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| What does the pilot do to change the RPM of an engine equipped with a constant-speed propeller when it is operating within the constant-speed range? | show 🗑
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| How is ice prevented from forming on propeller blades? | show 🗑
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| How is ice removed from propeller blades? | show 🗑
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| How can you determine that the electrically heated deicér boots on the propeller blades are working as they should? | show 🗑
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| show | The propeller governor of the master engine is set to the desired RPM. A signal from the master engine governor is sent to the control box which sends a signal to a stepping motor. This motor adjusts the propeller governor and fuel control of the slave en
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| Where do you find a list of the lubricants that are approved for use in a constant-speed propeller? | show 🗑
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| Who, or what facility, is authorized to perform major repairs to a propeller? | show 🗑
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| What checks and maintenance is a mechanic with a powerplant rating allowedto make on a propeller? | show 🗑
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| show | Adjust the maximum RPM stop.
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| Why do some aircraft engines have a critical range of operation? | show 🗑
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| What is the difference between a controllable propeller and a constant-speed propeller? | show 🗑
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| Does centrifugal twisting moment on a propeller blade tend to move the blades toward high pitch or toward low pitch? | show 🗑
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| show | Toward high pitch.
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| What is adjusted inside the governor for a constant-speed propeller to change the speed at which the propeller is operating? | show 🗑
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| show | 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.
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| show | This is the mode of ground operation, and it includes starting, taxiing, and ground reverse operation.
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| show | This is the in-flight mode of operation from takeoff to landing.
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| What is done to cause a McCauley propeller to feather? | show 🗑
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| show | 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 fast enough that centrifugal force holds the blades unlatched so th
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| show | In low pitch.
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| What is done to cause a Hydromatic propeller to feather? | show 🗑
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| When making a magneto check on an engine equipped with a constant-speed propeller, should the propeller control be in the low-pitch or the high-pitch position? | show 🗑
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| show | Install a spacer behind the rear cone to move the propeller forward on the shaft.
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| What is the function of the snap ring inside the hub of a propeller that is mounted on a tapered or splined shaft? | show 🗑
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| Why is a propeller indexed to the engine crankshaft? | show 🗑
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| What instrument is used to measure the blade angle of a propeller? | show 🗑
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| show | At a distance from the center of the propeller hub. This distance is specified in the propeller maintenance manual in terms of propeller blade stations.
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| show | Only minor repairs or minor alterations.
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| show | In AC 43.13- lB. Chapter 8, Section 4.
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| show | No, this could cause hidden damage that may render the blade nonrepairable.
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| What would be the classification of maintenance for shortening a propeller. blade? | show 🗑
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| May transverse cracks in a metal propeller blade be repaired? | show 🗑
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| show | Small roughness, nicks, and scratches in the leading edge of the blades.
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| How are small nicks removed from the leading edge of a propeller blade? | show 🗑
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| Who is allowed to reduce the diameter of a type certificated propeller? | show 🗑
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| How can you determine that a surface scratch in an aluminum alloy propeller blade is not actually a crack? | show 🗑
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| show | In the tall cone of the fuselage.
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| What is the function of an APU? | show 🗑
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| What are two sources of compressed air from an APU? | show 🗑
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| show | In section 4920.
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| How is most of the troubleshooting done for a modern APU? | show 🗑
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| show | The APU fuel control incorporates an automatic time-delay feature that closes thebleed air valve to remove most of the load and reduce the APU temperature before it is shut down.
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| show | The FADEC monitors the load and regulates the fuel going to the APU to prevent it from exceeding its safe limits.
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| show | The maintenance manual for the APU.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
Scanloni